Overview

Stage-1 asteroids

Stage-2 asteroids

Large MBAs

Notes

References


ASTEROID DIMENSIONS FROM OCCULTATIONS

John Broughton - updated 2018-04-30


    Presenting results for 520 asteroids, these tables are based on procedures formulated in 2011-2012 to combine diverse occultation data sourced from archived observations. Listed for comparison are the IRAS and AcuA radiometric diameters, followed by the derived mean diameter and geometric albedo. Adjacent to albedo is taxonomic classification in the Tholen system. In the events column, occultation totals are split into two distinct categories requiring different procedures in the calculation of event diameters. Category 1 represents the number of occultations with fitted ellipse plots, whereas category 2 tallies those with sparsely-observed chords. The reduction requires a diameter from each event to be combined in deriving the mean diameter and albedo. Double and single weight is applied according to category, except for short chords of category 2 where weight is fractional. Ellipsoid dimensions are based on limits determined by fitted-ellipse parameters and the longest chord, with the mean diameter playing a role in deriving the third dimension. Out of several thousand chords, 13 appear to be spurious due to their excessive length and have been excluded from the calculations. The only other exclusions apply to all-but-one Ceres occultation, as detailed in the Notes.

Selection criteria
    To qualify for the table of stage-1 asteroids requires one category-1 occultation (fitted ellipse) or at least three of category 2 (chord-length based). 1-sigma uncertainties in mean diameter are typically in the 5-15% range at that stage. Asteroids with at least two category-1 occultations are promoted to the stage 2 table, progressing uncertainty into the sub-5% range. Radiometric or occultation diameters in stage 2 are greyed when they are unlikely to be the best of the available figures; depending on consistency between the radiometric figures, the number and consistency of contributing event diameters, the relationship between taxonomic class and albedo, and other evidence. Such judgements are not based on error margins, given there are often much larger discrepancies between radiometric diameters in comparison with their stated margins. The 28 main-belt asteroids from both tables with derived mean diameters exceeding 200km are sorted in order of decreasing diameter in the table of Large MBAs - an apparent scarcity in the 185-200km range makes this a rational minimum size to distinguish them as large MBAs.

STAGE 1 (384 asteroids)
DesignationIRASAcuAOccAlbedoClassEllipsoidEventsPeriod
1 Ceres848 20974 13944 60.092G964*964*9041+0 1984
4 Vesta468 27522 7504 270.365V547*506*4631+41991-2010
5 Astraea119 7111 1121 60.219S155*112*1031+51991-2017
12 Victoria113 3132 2111 70.181S-0+61978-2017
13 Egeria208 8203 3219 90.074G242*226*1921+91992-2015
15 Eunomia255 15256 3287 130.166S388*337*1811+61982-2010
20 Massalia146 9132 1150 70.197S163*154*135-1+72003-2017
21 Lutetia96 4108 1100 50.202M113*96*931+41997-2017
24 Themis-177 2216 120.056C-0+91998-2016
28 Bellona121 397 1102 120.250S128*91*901+12002-2008
29 Amphitrite212 7207 3213 130.177S230*230*1841+22008-2015
30 Urania100 289 184 90.236S-0+41995-2014
33 Polyhymnia-54 164 60.166S-0+32004-2014
34 Circe114 3116 1126 60.044C144*126*1101+62003-2014
35 Leukothea103 3111 2104 60.065C121*101*921+42006-2011
36 Atalante106 4111 2105 60.066C124*110*861+61999-2016
37 Fides108 2103 1107 70.188S117*116*901+31996-2014
38 Leda116 2114 279 50.134C-0+71986-2017
39 Laetitia150 9152 2168 100.228S216*149*1471+31998-2014
40 Harmonia108 6110 1120 60.196S148*133*871+32007-2011
46 Hestia124 4121 2123 60.053P154*114*1061+42006-2016
47 Aglaja127 8147 4118 60.092C140*136*871+51984-2012
49 Pales150 4148 3160 130.052CG-0+41998-2014
50 Virginia100 584 173 80.067X-0+61991-2017
54 Alexandra166 3144 2150 60.068C160*155*1351+92005-2015
55 Pandora67 363 175 40.239M91*80*581+32001-2010
57 Mnemosyne113 3109 1127 60.168S148*147*951+32008-2016
60 Echo60 259 158 60.276S-0+32004-2015
61 Danae82 484 196 40.163S112*101*781+51993-2014
62 Erato95 279 180 60.087BU-0+52008-2017
64 Angelina-54 150 30.602E53*481+02004
66 Maja73 572 160 60.087C-0+32010-2013
67 Asia58 162 160 30.238S73*55*551+72008-2016
68 Leto123 5122 1155 150.142S-0+31999-2017
70 Panopaea122 2141 2136 60.055C145*136*1261+52005-2017
71 Niobe83 281 176 40.365S87*79*651+72004-2015
73 Klytia44 346 156 50.140S-0+32008-2014
74 Galatea119 3113 2124 60.040C183*110*951+61987-2011
77 Frigga69 266 172 70.133C-0+31999-2016
78 Diana121 3127 2124 50.067C141*135*1001+71980-2014
79 Eurynome67 275 176 60.200S-0+42008-2017
80 Sappho78 271 168 40.246S83*63*601+32004-2014
82 Alkmene61 264 159 40.219S63*60*551+22003-2014
83 Beatrix81 287 166 50.138X-0+71983-2017
84 Klio79 278 176 70.057G-0+41997-2012
86 Semele121 3117 2116 70.051C122*120*1051+22005-2010
91 Aegina110 3100 1106 50.046CP130*96*951+82004-2015
97 Klotho83 588 186 50.212M96*94*711+32006-2008
98 Lanthe105 2104 1102 60.049CG-0+72003-2014
100 Hekate89 289 184 40.213S99*84*721+62003-2016
103 Hera91 683 1101 50.151S112*102*891+42005-2014
109 Felicitas89 381 186 50.076GC94*83*811+22003-2015
110 Lydia86 283 188 40.175M97*93*741+41999-2017
112 Iphigenia72 471 167 40.046DCP70*70*611+32005-2017
113 Amathea46 146 149 30.231S69*351+02017
114 Kassandra100 294 180 40.137T108*78*611+52003-2017
115 Thyra80 181 180 70.273S84*83*731+12003-2016
116 Sirona72 678 181 40.202S102*81*641+42005-2017
117 Lomia149 7145 2150 70.052PC185*146*1261+62000-2015
119 Althaea57 159 176 50.131S-0+52002-2016
120 Lachesis174 3157 2164 90.052C189*155*1511+71999-2016
124 Alkeste76 281 169 40.213S76*74*581+22003-2012
125 Liberatrix44 243 161 50.114M-0+31986-2015
131 Vala40 237 132 30.169SU-0+42002-2017
132 Aethra43 244 154 40.107M-0+52004-2013
137 Meliboea145 3144 3137 80.057C158*143*1141+32007-2016
138 Tolosa462352 155 50.188C-0+32009-2017
143 Adria90 292 291 60.048C96*90*881+22000-2016
145 Adeona151 3141 5156 110.040C-0+52002-2015
147 Protogeneia133 5108 2106 100.078C-0+42002-2017
151 Abundantia45 142 142 30.201S-0+42004-2017
152 Atala-57 170 40.167I79*79*561+21994-2014
154 Bertha185 4186 3197 90.043-223*187*1831+62006-2017
155 Scylia50 139 134 30.043PFC-0+42007-2017
158 Koronis35 134 140 30.214S45*43*341+12005-2012
159 Aemilia125 2130 2144 70.048C159*150*1271+32001-2010
160 Una81 278 178 40.068CP85*711+02011
162 Laurentia99 385 3106 60.047STU124*109*881+31999-2013
164 Eva105 298 2100 40.049CX125*99*811+82000-2017
165 Loreley155 5174 3167 70.055CD208*167*1331+72003-2017
166 Rhodope-53 157 40.061GC:64*56*511+22005-2015
167 Urda40 238 131 20.367S41*231+02001
168 Sibylia148 4146 2158 70.047C191*165*1261+62005-2016
171 Ophelia117 4105 1110 80.069C-0+52005-2017
174 Phaedra69 464 153 60.253S-0+32007-2017
175 Andromache101 796 2119 90.059C-0+42005-2012
177 Irma73 273 166 50.065C:-0+52006-2012
179 Klytaemnestra78 164 172 40.189S88*74*571+52003-2014
185 Eunike158 3168 3172 70.054C195*170*1541+111990-2015
187 Lamberta131 3130 2141 80.048C154*138*1331+32005-2017
193 Ambrosia-38 124 20.403--0+42016-2017
196 Philomela136 6142 2168 130.152S-0+51999-2014
198 Ampella57 361 153 30.292S65*52*451+61991-2016
203 Pompeja116 3108 2109 70.047DCX:113*113*1021+42003-2014
204 Kallisto49 151 153 20.178S58*54*481+62002-2017
206 Hersilia-94 1102 60.058C114*100*921+32005-2017
207 Hedda59 164 155 50.063C-0+62005-2016
208 Lacrimosa41 240 144 30.234S47*44*421+12003-2016
209 Dido160 3133 2145 110.043C180*134*1261+22005-2008
210 Isabella87 270 173 40.062CF86*85*531+32003-2016
211 Isolda143 5153 2148 70.057C155*145*1431+42009-2017
212 Medea136 3154 3136 70.047DCP:158*138*1151+42004-2016
213 Lilaea83 376 185 50.086F93*81*811+32005-2012
217 Eudora66 268 153 40.076X-0+61991-2017
218 Bianca61 161 161 40.173S-0+62008-2015
221 Eos104 4108 2109 70.126S-0+52004-2016
222 Lucia55 453 154 50.137BU-0+32001-2016
223 Rosa88 481 172 70.046X-0+32004-2014
227 Philosophia87 296 290 80.072--0+42005-2016
229 Adelinda93 4109 190 60.049BCU113*86*751+32004-2015
231 Vindobona82 280 173 60.069--0+52003-2016
233 Asterope103 893 1107 50.081T130*104*901+72003-2015
239 Adrastea42 141 134 30.117-38*34*301+12007-2009
241 Germania169 3182 3185 80.048CP216*187*1571+72000-2017
242 Kreimhild38 245 157 50.114--0+31998-2012
248 Lameia49 352 150 30.058-60*49*431+31998-2012
250 Bettina80 5109 1122 70.109M-0+91988-2017
253 Mathilde58 354 156 40.047--0+62001-2014
257 Silesia73 279 172 70.055SCTU-0+31999-2016
258 Tyche65 164 159 40.201S-0+62003-2014
259 Aletheia179 7175 2199 110.035CP235*212*1591+31986-2008
260 Huberta95 495 181 60.070CP:98*81*671+12007-2010
261 Prymno51 145 149 30.121B59*57*361+51999-2017
266 Aline109 3102 1109 60.045C119*113*971+42010-2012
267 Tirza53 356 150 40.045DU60*51*401+12008-2012
268 Adorea140 5136 2142 60.043FC149*142*1341+72002-2016
270 Anahita51 247 151 40.212S55*51*481+12008-2014
276 Adelheid122 8135 2113 60.052P131*113*971+32002-2010
279 Thule127 4113 3117 70.048D126*123*1041+21999-2008
283 Emma148 5122 1111 80.047P-0+52008-2010
284 Amalia53 358 154 30.059CP61*56*451+42004-2017
287 Nephthys68 166 172 40.165S89*67*621+32003-2015
302 Clarissa39 334 147 30.036F66*57*271+32002-2006
303 Josephina99 299 2104 60.054-117*109*871+32001-2014
304 Olga68 271 163 30.058C71*69*501+52002-2017
306 Unitas47 246 150 30.186S61*46*441+32004-2015
312 Pierretta50 2 48 146 20.227S50*431+02012
313 Chaldaea96 295 185 50.068C-0+71989-2014
314 Rosalia57 257 172 80.055C-0+32000-2016
318 Magdalena-93 185 80.043CXF-0+32011-2017
322 Phaeo71 572 168 60.096X-0+32012-2015
323 Brucia36 237 135 50.182S-0+32007-2016
325 Heidelberga76 276 185 70.084M-0+42005-2012
326 Tamara93 289 279 40.051C101*75*661+82005-2017
328 Gudrun123 5125 2114 60.049S-1+32005-2016
332 Siri40 243 152 60.102--0+32009-2014
336 Lacadiera69 269 186 40.030D126*83*601+71986-2012
337 Devosa59 267 168 40.121X80*77*521+22008-2015
339 Dorothea38 245 145 50.174S-0+32010-2015
342 Endymion61 356 151 50.056C-0+31989-2015
345 Tercidina94 599 197 40.062C108*91*911+52000-2015
346 Hermentaria107 293 1102 110.239S-0+31999-2017
347 Pariana51 451 162 30.121M79*77*391+42010-2017
348 May83 281 185 90.043--0+32003-2010
349 Dembowska140 4165 2172 110.253R211*180*1341+12000-2017
354 Eleonora155 9150 2165 120.172S186*164*1481+12002-2016
356 Liguria131 3137 2133 60.051C152*134*1161+51991-2010
358 Apollonia90 389 1100 80.040--0+32004-2016
360 Carlova116 4122 2134 60.040C167*150*951+62000-2017
361 Bononia142 7152 2131 90.053DP142*142*1101+32001-2011
362 Havnia-85 197 100.047XC-0+32014-2017
363 Padua-91 168 60.097XC-0+41997-2016
365 Corduba106 3104 1107 70.033X112*111*971+22007-2013
369 Aeria60 165 156 40.223M64*54*491+21989-2018
371 Bohemia55 146 164 40.139QSV70*63*601+32003-2010
374 Burgundia45 153 147 40.273S-0+32009-2013
377 Campania91 293 1101 50.048PD123*116*721+91997-2017
380 Fiducia73 376 173 60.057C95*561+02009
381 Myrrha121 3117 2129 80.054C148*125*1161+21991-2015
387 Aquitania101 3105 1103 70.183S124*98*891+12013-2017
397 Vienna43 246 148 30.145S51*461+02005
399 Persephone49 446 160 80.123-75*55*531+12001-2007
402 Chloe54 361 167 30.096S76*73*551+62003-2015
405 Thia125 2113 2113 50.058C150*122*781+122006-2017
407 Arachne95 598 289 80.062C-0+42002-2013
410 Chloris124 5107 1114 100.065C-0+42001-2013
411 Xanthe77 286 381 50.072-89*84*721+32006-2012
412 Elisabetha91 2101 192 40.053-104*89*841+52011-2017
415 Palatia76 588 167 40.083DP95*72*431+22009-2015
417 Suevia41 250 149 40.133M-0+32003-2012
419 Aurelia129 4122 2121 60.052F137*117*1101+52001-2017
420 Bertholda141 7142 3149 70.038P169*160*1231+72003-2017
429 Lotis70 273 163 40.053C-0+52006-2016
430 Hybris33 141 134 30.117-55*30*241+12012-2016
431 Nephele95 291 169 50.122B79*591+02002
433 Eros-15 013 10.560S18*16*71+31975-2011
438 Zeuxo61 463 169 70.045F:-0+32008-2017
441 Bathilde70 359 173 50.129M-0+72003-2016
442 Eichsfeldia66 165 162 40.044C64*64*601+12010-2014
445 Edna87 289 197 60.036C-0+91997-2016
449 Hamburga86 264 172 30.056C84*78*561+51998-2016
455 Bruchsalia84 583 193 80.059CP-0+42012-2016
456 Abnoba40 443 139 30.240-42*371+02006
464 Magaira74 679 190 40.034FPU:109*89*751+52004-2017
466 Tisiphone116 2102 1129 90.051C135*134*1191+31988-2014
468 Lina69 360 167 20.046CPF78*571+02009
469 Argentina126 6123 2123 90.042P-0+42003-2013
472 Roma47 348 150 30.194S57*49*441+22010-2017
474 Prudentia38 439 144 30.054-49*47*361+22010-2015
476 Hedwig117 3111 2108 50.058P132*129*741+72000-2017
479 Caprera73 372 178 80.042--0+32007-2017
480 Hansa56 356 165 50.187S-0+42009-2013
481 Emita116 0104 2116 90.048C-0+51989-2017
483 Seppina70 370 171 70.162S91*561+02005
485 Genua64 355 162 60.217--0+32005-2014
487 Venetia63 166 168 60.214S-0+32011-2016
488 Kreusa150 6173 3119 80.094S-0+52006-2015
490 Veritas116 6113 2110 60.069C122*108*991+32006-2016
491 Carina97 497 198 60.073--0+62004-2017
494 Virtus86 288 289 90.058C109*99*661+32006-2009
498 Tokio83 286 181 50.072M94*86*651+22004-2007
501 Urhixdur77 279 175 70.087--0+32007-2017
503 Evelyn82 590 1106 80.035PC-0+52003-2010
505 Cava-101 1110 110.052FC-0+42012-2017
506 Marion106 399 1102 50.049PC115*96*961+72005-2017
508 Princetonia142 3139 2120 70.063C160*105*1021+42004-2016
509 Iolanda53 459 172 70.145S-0+52004-2017
510 Mabella57 355 167 50.050PD-0+61986-2017
511 Davida326 5291 4313 140.059C356*296*2911+81987-2017
514 Armida106 497 197 50.045XC163*80*701+52003-2017
516 Amherstia73 266 173 40.165M83*81*571+22002-2017
519 Sylvania48 250 140 30.246S-0+52006-2015
522 Helga101 4101 184 40.057P120*581+02004
524 Fidelio72 369 173 40.039PC85*77*581+31997-2006
526 Jena42 245 142 30.085B57*38*351+12008-2016
528 Rezia83 385 187 80.051-110*78*781+12003-2017
530 Turandot85 388 293 50.040F103*99*781+32006-2014
531 Merapi151 9146 3161 90.040X173*172*1401+41997-2013
532 Herculina222 4217 3223 190.169S-0+41978-2015
535 Montague75 575 190 100.035C-0+32002-2015
536 Merapi151 9146 3161 90.040P173*172*1401+41997-2013
537 Pauly39 244 146 50.251DU:-0+32013-2017
539 Pamina54 361 159 50.067-87*54*441+22008-2017
541 Deborah57 353 156 40.052--0+42003-2017
543 Charlotte34 346 162 50.080--0+42016-2017
545 Messalina111 4102 2110 90.042CD-0+32006-2014
547 Praxedis70 271 169 40.058XD:79*79*521+42006-2014
552 Sigelinde78 378 186 90.041--0+32007-2014
558 Carmen59 260 157 30.127M72*53*481+52006-2011
559 Nanon80 362 159 30.090C82*56*461+71999-2014
564 Dudu50 550 149 30.049CDP:65*46*401+32008-2012
565 Marbachia28 128 034 30.066S44*31*301+12010-2015
566 Stereoskopia168 6177 2172 120.037C250*190*1071+32004-2013
567 Eleutheria93 296 180 60.060CFB:-0+42006-2017
568 Cheruskia87 277 181 40.061-93*85*681+101999-2016
569 Misa73 265 160 40.044C68*66*491+31998-2016
573 Recha48 442 152 60.091-62*441+02005
576 Emanuela85 487 193 50.036-122*97*681+22013
579 Sidonia86 283 110470.117S115*106*931+22009-2015
583 Klothilde82 383 191 40.053C110*95*731+6 2008-2016
585 Bilkis58 157 150 30.050C-0+62003-2013
586 Thekla82 278 180 30.057C:100*651+02009
589 Croatia88 392 1105 50.036CX119*108*891+42002-2015
590 Tomyris40 137 134 30.166-45*31*291+12003-2008
592 Bathseba-47 145 30.166-59*47*331+22005-2016
593 Titania75 575 189 80.044--0+32011-2013
595 Polyxena109 2110 193 60.130-134*80*741+22008-2015
596 Scheila113 2120 2100 90.049PCD-0+31992-2012
597 Bandusia36 441 128 30.382PCD-0+32003-2017
598 Octavia72 478 374 40.050C:90*73*611+22010-2014
601 Nerthus73 275 171 50.049P-0+62002-2017
602 Marianna125 2130 2108 50.072C126*110*901+72006-2017
605 Juvisia70 563 166 70.044-671+12015-2017
607 Jenny63 263 152 50.103-68*48*431+12007-2016
613 Ginevra80 275 181 60.037P89*82*721+12011-2012
617 Patroclus141 5141 3101 60.046P125*98*851+22005-2013
624 Hektor-231 4143 130.087D-0+32008-2012
626 Notburga101 277 192 40.052CX109*94*761+91988-2017
635 Vundtia98 3 99 198 80.046C-0+42011-2016
636 Erika74 3 74 286 80.038--0+32009-2015
638 Moira66 166 168 40.046-108*58*501+62001-2016
648 Pippa68 276 185 70.033XC-0+42010-2017
657 Gunlod43 140 142 30.042--0+62001-2017
667 Denise81 290 268 60.106--1+12004-2008
674 Rachele97 489 191 60.229S106*94*761+31999-2017
676 Melitta80 182 189 50.042PC115*691+02007
678 Fredegundis42 242 153 30.156-91*45*36-1+42004-2015
679 Pax52 261 140 40.272I51*36*36-1+12015
680 Genoveva84 183 283 70.049PC-0+62005-2016
683 Lanzia82 22113 1122 80.068--0+62010-2017
686 Gersuind41 549 144 30.124S-0+52001-2017
688 Melanie41 349 152 50.038--0+32002-2017
696 Leonora76 295 166 50.103XC-0+41998-2016
697 Galilea80 277 267 40.055C:89*62*551+22006-2011
701 Oriola40 239 146 50.167C51*46*411+02002
709 Fringilla97 396 1101 50.042P114*100*901+42003-2016
713 Luscinia106 397 188 60.059C98*98*711+22007-2016
738 Alagasta63 155 153 40.055CGSU59*57*451+32002-2017
748 Simeisa103 2112 2108 50.038P112*110*1021+61999-2013
751 Faina111 4107 1117 60.044C138*132*881+42007-2017
754 Malabar88 691 194 60.042PC-0+72002-2017
757 Portlandia32 134 041 20.087MF50*41*341+22003-2014
759 Vinifera45 346 146 30.052-59*58*291+22011-2015
760 Massinga71 270 177 50.194SU100*81*561+22012-2017
773 Irmintraud96 287 285 50.056D126*83*591+62005-2016
776 Berbericia151 4150 2143 60.074C175*143*1161+102004-2014
779 Nina77 481 181 70.128--0+42004-2016
786 Bredichina92 6111 1117 70.045C161*123*811+22005-2015
792 Metcalfia61 159 148 20.057-70*46*341+52006-2017
796 Sarita45 242 139 40.256MD-0+32004-2012
803 Picka47 257 170 70.052--0+32002-2016
804 Hispania157 6147 2134 100.072PC-0+41992-2012
808 Merxia33 234 131 20.246-47*30*201+22008-2012
814 Tauris110 3110 3117 110.041C-0+41999-2015
818 Kapteynia50 451 158 70.121--0+32005-2010
824 Anastasia34 529 129 30.146S42*26*221+12010-2015
828 Lindemania53 255 150 50.051PFU53*481+12002-2004
834 Burnhamia67 261 269 40.064GS:79*72*581+32008-2017
838 Seraphina60 249 151 30.062P-0+32007-2017
844 Leontina66 040 132 30.298--0+32002-2014
845 Naema54 361 156 30.075-64*63*431+52002-2010
849 Ara62 360 175 40.179M98*71*621+52009-2017
866 Fatme88 286 188 60.036-99*95*731+12008-2011
868 Lova53 255 152 40.054C:64*49*431+12006-2007
874 Rotraut56 659 140 30.109-51*38*341+22009-2015
886 Washingtonia91 1397 189 50.074-100*88*801+22008-2014
891 Gunhild52 664 165 50.046--0+52010-2017
892 Seeligeria76 280 177 50.048--0+51996-2015
894 Erda36 238 137 50.226--0+32010-2016
895 Helio142 4128 2161 90.033FCB225*142*1301+41989-2011
903 Nealley63 271 164 60.053--0+42003-2017
904 Rockefellia59 261 141 40.114--0+32005-2016
909 Ulla116 2113 1124 150.030P-0+32001-2011
911 Agamemnon167 4185 3155 90.052D191*144*1351+42000-2017
912 Maritima83 290 187 60.102-97*88*781+12011-2014
914 Palisana77 297 185 30.077CU108*84*671+131998-2016
917 Lyka28 431 130 30.081-39*221+02005
924 Toni86 378 175 60.056CX-0+51992-2014
952 Caia82588 185 50.051-95*88*741+32008-2017
972 Cohnia76 280 178 50.047--0+52001-2016
973 Aralia52 256 154 40.087--1+12008-2010
976 Benjamina81 380 174 40.065PD:93*89*501+62003-2016
980 Anacostia86 278 164 50.311SU:-0+42009-2017
983 Gunilla74 193 172 40.051XD81*80*571+62006-2017
1021 Flammario99 297 1122 120.030F-0+32005-2014
1028 Lydina71 297 189 80.038C112*80*791+12000-2013
1030 Vitja64 258 162 50.035-75*57*541+12007-2012
1032 Pafuri57 363 163 70.044--0+32002-2015
1036 Ganymed32 335 138 40.199S-0+31985-2011
1048 Feodosia70 285 166 40.051PC75*64*601+42002-2015
1049 Gotho51 455 152 50.050--0+42002-2013
1051 Merope67 270 164 40.047-88*71*421+32002-2011
1062 Ljuba55 256 155 60.068--0+32004-2010
1086 Nata66 468 176 40.059-89*76*641+02007
1093 Freda117 3102 1116 80.039C-1+12005-2010
1113 Katja39 238 142 30.174-57*44*301+22002-2018
1114 Lorraine62 268 170 50.039-83*69*601+22000-2015
1118 Hanskya77 280 173 90.053--0+42010-2017
1135 Colchis51 247 155 60.049--0+32003-2012
1149 Volga56 258 158 20.031-69*491+02008
1157 Arabia-29 125 30.277-34*211+12008-2009
1165 Imprinetta49 253 252 40.050-63*49*451+12008-2010
1177 Gonnessia92 1094 178 50.055PFU95*79*641+32003-2015
1186 Turnera36 239 157 20.114S58*551+02017
1212 Francette82 386 279 60.043P85*78*751+12005-2010
1242 Zambesia48 262 148 70.071--0+32001-2014
1243 Pamela70 670 176 110.041--0+32011-2016
1247 Memoria36 235 138 50.075CXF-0+32005-2015
1258 Sicilia45 245 143 40.060-58*40*341+12008-2014
1263 Varsavia49 151 144 20.057P54*361+02003
1264 Letaba75 270 179 80.064P-0+32011-2016
1271 Isergina44 352 149 20.043-62*381+02013
1303 Luthera86 287 183 140.065--0+32001-2014
1309 Hyperborea57 458 157 30.045-60*59*531+22009-2016
1315 Bronislawa64 163 170 60.036-80*66*641+22005-2016
1329 Elaine28 021 026 20.112S27*27*251+32004-2015
1366 Piccolo28 227 130 20.131-40*221+02003
1437 Diomedes164 4173 3132 60.048DP174*1011+01997
1467 Mashona112 095 1107100.058GC-0+32001-2017
1477 Bonsdorffia28 136 140 20.026PU-1+02004
1512 Oulu83 391 261 50.066P86*55*491+12002-2014
1614 Goldschmidt46 149 139 30.062-52*321+12008-2010
1796 Riga74 286 250 30.083XFCU66*44*421+32008-2016
1867 Deiphobus123 4131 2127 80.040D146*128*1091+32007-2016
1963 Bezovec45 140 137 30.055C-0+52005-2016
2258 Viipuri24 127 126 10.074-30*221+02013
2260 Neoptolemus72 381 488 40.043DTU:-1+02010
2307 Garuda41 142 142 10.045-44*391+02014
2892 Filipenko56 157 162 60.039--0+32015-2016
3171 Wangshouguan47 041 137 20.063-45*291+02002
4709 Ennomos81 480 2100 80.049-108*911+02011
4317 Garibaldi50 4-40 30.078-49*321+22011-2013
10199 Chariklo--248 180.066--1+02013
136472 MakeMake--1430 1031.139-1430*14301+02011

STAGE 2 (136 asteroids)
DesignationIRASAcuAOccAlbedoClassEllipsoidEventsPeriod
2 Pallas498 19513 5533 160.138B554*534*5123+14 1961-2015
3 Juno234 11231 3272 90.176S311*274*2363+71958-2017
6 Hebe185 3197 2206 80.216S241*201*1822+31977-2013
7 Iris200 10254 3217 70.236S260*240*1633+111995-2016
8 Flora136 2138 1154 60.189S213*140*1222+52004-2018
9 Metis-166 2169 40.191S226*173*1225+71979-2014
10 Hygiea407 7428 7426 130.066C460*416*4043+131983-2017
11 Parthenope153 3 150 2157 6 0.173S175*152*1442+61987-2014
14 Irene-144 2148 70.244S188*146*1182+41982-2013
16 Psyche253 4207 3218 60.162M247*232*1813+22002-2015
17 Thetis90 475 176 30.244S82*82*632+32004-2013
18 Melpomene141 3140 2133 50.250S150*132*1172+41978-2017
19 Fortuna-200 3214 60.054G250*203*1943+101982-2017
22 Kalliope181 5140 2144 40.224M209*129*1114+32004-2017
25 Phocaea75 483 178 30.215S97*73*662+141998-2017
27 Euterpe-110 2121 40.191S167*141*752+111993-2016
31 Euphrosyne256 12276 3249 90.057C308*233*2162+82006-2017
41 Daphne174 12180 3182 40.075C236*162*1595+111997-2017
42 Isis100 3105 1105 40.156S127*102*892+32005-2011
43 Ariadne66 359 165 20.281S90*68*443+12008-2012
44 Nysa71 476 169 40.566E99*67*502+41981-2017
45 Eugenia215 4184 3188 60.052FC238*184*1524+9 1994-2017
48 Doris222 8200 3201 80.076CG272*212*1422+71981-2011
51 Nemausa148 2148 2148 30.093CU166*158*1237+131979-2017
52 Europa303 5350 5318 100.052CF364*344*2573+131983-2017
56 Melete113 2105 1128 40.051P136*134*1143+61994-2017
58 Concordia93 394 1101 40.050C112*108*852+42008-2016
59 Elpis165 6156 2178 60.037CP203*174*1612+52005-2017
63 Ausonia103 287 1109 30.142S150*115*754+71999-2016
65 Cybele237 4301 5239 90.070P285*241*1982+81979-2017
70 Panopaea122 2141 2133 50.057C147*136*1172+32005-2014
72 Feronia86 483 188 30.061TDG104*95*692+92003-2017
76 Freia184 4168 2159 60.049P201*151*1322+72005-2017
81 Terpsichore119 2123 1121 40.049C134*120*1092+42004-2015
85 Io155 4151 2169 40.056FC215*193*1165+111995-2016
87 Sylvia261 13263 4272 60.040P356*250*2274+41984-2014
88 Thisbe201 5196 3211 50.060CF248*219*1745+71981-2017
89 Julia152 3147 2152 50.176S174*148*1352+81985-2017
90 Antiope120 4124 287 & 87 20.058C108*90*672+41988-2015
92 Undina126 3121 2153 60.171M180*149*1342+22006-2017
93 Minerva141 4147 2153 50.063CU189*141*1333+81982-2014
94 Aurora205 4179 4180 50.051CP214*166*1633+42001-2013
95 Arethusa136 10144 5146 40.061C195*163*983+41998-2014
96 Aegle170 3165 3162 40.058T199*158*1344+82002-2017
99 Dike72 371 167 20.066C81*67*563+22005-2010
102 Miriam83 295 289 30.044P117*95*632+52000-2016
105 Artemis119 3123 2109 30.056C125*121*855+101981-2017
106 Dione147 3153 2144 50.092G177*142*1202+81983-2016
107 Camilla223 17200 4240 60.045C322*290*1484+92004-2016
111 Ate135 5146 2132 30.063C161*151*944+52000-2016
121 Hermione209 5194 3171 80.072C230*159*1372+51988-2017
127 Johanna-114 2127 40.052CP158*140*932+82006-2017
128 Nemesis188 4178 2169 60.062C225*181*1192+42005-2012
129 Antigone125 0120 1134 50.147M153*148*1062+31985-2009
130 Elektra182 12183 2201 70.061G262*201*1542+102007-2018
134 Sophrosyne123 2100 1104 40.051C140*90-892+111980-2017
135 Hertha79 273 185 30.124M103*102*592+32000-2015
139 Juewa157 3167 3153 40.058CP170*155*1363+51988-2017
140 Siwa110 3111 299 50.084P121*92*862+42006-2016
141 Lumen131 3132 2141 40.047CPF166*161*1043+72004-2017
144 Vibilia142 3142 2148 40.055C190*143*1203+71993-2014
146 Lucina132 2127 2123 50.061C151*145*862+101982-2017
153 Hilda171 3163 3166 40.066P210*165*1314+22002-2017
156 Xanthippe121 3115 2108 40.053C126*107*952+72004-2017
173 Ino154 4161 3144 70.074C156*152*1262+42005-2017
176 Iduna121 2119 1134 50.068G181*151*892+61998-2015
191 Kolga101 4101 1108 40.036PC:126*114*872+52008-2017
192 Nausikaa103 289 199 40.253S114*101*852+41998-2016
194 Prokne168 4167 2171 50.051C225*162*1363+101984-2017
200 Dynamene128 2134 2128 50.054C132*128*1242+22006-2013
205 Martha81 182 160 20.101C78*55*492+42003-2017
216 Kleopatra135 2122 2104 30.197M264*71*605+61980-2017
219 Thusnelda41 342 130 10.377S46*26*212+02003-2007
225 Henrietta121 3108 2109 30.048F158*94*884+92001-2017
230 Athamantis109 2108 1111 50.165S130*116*903+11984-2014
234 Barbara44 148 147 20.197S52*49*403+12009-2010
236 Honoria86 481 187 30.124S97*97*712+72008-2016
238 Hypatia149 4144 2143 50.046C169*137*1252+122001-2017
240 Vanadis104 390 186 30.060C107*81*742+52009-2014
247 Eukrate134 3150 2137 50.057CP169*126*1222+62004-2016
275 Sapientia121 0119 2108 30.044P122*114*903+81985-2016
276 Adelheid122 8135 2118 40.048P166*118*833+32002-2017
308 Polyxo141 4135 2133 40.054T166*142*1003+52000-2018
324 Bamberga229 7230 3222 60.067CP266*266*1554+71987-2017
329 Svea78 170 172 30.047C83*74*602+32007-2017
334 Chicago156 9167 2178 60.049C235*162*1493+12001-2017
344 Desiderata132 6133 2123 40.068C220*144*593+32004-2016
350 Ornamenta118 5117 1119 50.056C137*136*912+12002-2016
357 Ninina106 2110 2111 50.047CP118*113*1022+12003-2017
366 Vincentina94 386 186 60.096-120*82*632+22003-2011
372 Palma189 3177 3185 40.068BFC215*190*1545+92000-2017
375 Ursula-194 3202 60.044C220*202*1863+71982-2012
386 Siegena165 3201 4183 50.056C220*220*1274+71982-2017
388 Charybdis114 7121 2129 50.040C148*137*1052+32004-2017
392 Wilhelmina63 259 163 30.059-94*73*362+42002-2014
393 Lampetia97 31134 2121 30.053C152*113*1033+62005-2016
404 Arsinoe98 293 199 30.045C117*100*833+82003-2017
409 Aspasia162 7197 4167 40.057CP199*165*1425+141986-2017
423 Diotima209 5227 3186 50.065C252*182*1413+41991-2016
426 Hippo127 4121 2133 50.043F185*129*982+52001-2015
444 Gyptis160 10166 7164 50.048C201*148*1484+81990-2016
451 Patientia225 4235 3253 70.061CU267*254*2383+12013-2016
471 Papagena134 5117 2133 50.202S175*162*832+41987-2014
489 Comacina139 3135 2125 30.053C169*122*954+42000-2015
521 Brixia116 2125 2114 40.065C129*116*982+71989-2013
554 Peraga96 497 1106 30.040FC143*107*783+21999-2011
578 Happelia69 265 172 20.071-83*81*564+51998-2017
580 Selene46 348 151 20.056-73*48*382+01999-2006
599 Luisa65 262 171 10.114S79*73*642+02009-2017
618 Elfriede120 5122 2131 50.051C175*143*902+22008-2015
628 Christine50 252 160 30.100SD84*70*362+62005-2016
654 Zelinda127 4124 1119 30.049C138*119*1035+131995-2016
663 Gerlinde101 397 192 40.043P111*102*682+52003-2017
675 Ludmilla-68 178 40.198S91*89*602+32007-2013
690 Wratislavia135 4158 2145 50.052CPF180*172*982+71982-2017
693 Zerbinetta68 180 171 30.062ST74*72*682+72003-2017
694 Ekard91 492 198 40.040CP:125*88*852+102009-2016
695 Bella48 242 152 30.124S63*58*392+22008-2016
702 Alauda195 3191 3202 70.055C222*204*1812+132001-2017
704 Interamnia317 5316 3317 70.074F358*340*2625+81984-2017
705 Erminia134 2150 3129 40.047P150*134*1063+41998-2015
712 Boliviana128 2113 2118 30.059C138*120*1004+101994-2013
732 Tjilaki38 236 135 10.075-38*34*342+22005-2013
735 Marghanna74 279 272 30.052C82*73*622+12008-2011
739 Mandeville107 3123 2114 40.054P133*133*842+32006-2017
747 Winchester172 3170 3178 40.047PC208*182*1485+51984-2016
772 Tanette118 4117 2128 50.050C143*127*1162+22004-2017
788 Hohensteina104 3118 2103 30.079-135*109*753+22006-2014
790 Pretoria170 3145 5157 60.045P170*163*1402+71998-2016
791 Ani104 298 189 50.044C110*99*662+22000-2016
856 Backlunda5243 147 20.042-60*48*373+12003-2009
893 Leopoldina76 576 169 30.060PF88*65*582+21996-2017
925 Alphonsina54 363 158 20.249S80*54*443+52003-2017
978 Aidamina79 282 383 30.033PF107*100*532+42001-2017
1107 Lictoria79 381 182 50.060-108*87*592+22002-2016
1330 Spiridonia56 574 164 30.037P75*61*582+11993-2007

LARGE MBAs (28 asteroids)
DesignationIRAS AcuAOcc AlbedoClassEllipsoidEventsPeriod
1 Ceres848 20974 13944 60.092G964*964*9041+0 1984
2 Pallas498 19513 5533 160.138B554*534*5123+14 1961-2015
4 Vesta468 27522 7504 270.365V547*506*4631+4 1991-2010
10 Hygiea407 7428 7426 130.066C460*416*4043+131983-2017
52 Europa303 5350 5318 100.052CF364*344*2573+131983-2017
704 Interamnia317 5316 3317 70.074F358*340*2625+81984-2017
511 Davida326 5291 4313 140.059C356*296*2911+81987-2017
15 Eunomia255 15256 3287 130.166S388*337*1811+6 1982-2010
87 Sylvia261 13263 4272 60.040P356*250*2274+41984-2014
3 Juno234 11231 3272 80.176S311*274*2363+71958-2017
451 Patientia225 4235 3253 70.061CU267*254*2383+12013-2016
31 Euphrosyne256 12276 3249 90.057C308*233*2162+82006-2017
107 Camilla223 17200 4240 60.045C322*290*1484+92004-2016
65 Cybele237 4301 5239 90.070P285*241*1982+71979-2017
532 Herculina222 4217 3223 190.169S-0+41978-2015
16 Psyche253 4207 3218 60.162M247*236*1773+12002-2014
19 Fortuna-200 3217 60.053G250*212*1943+81982-2016
7 Iris200 10254 3217 70.236S260*240*1633+111995-2016
324 Bamberga229 7230 3216 50.071CP267*243*1554+41987-2015
24 Themis-177 2216 120.056C-0+91998-2016
13 Egeria208 8203 3215 90.077G228*226*1921+81992-2013
29 Amphitrite212 7207 3213 130.177S230*230*1841+22008-2015
88 Thisbe201 5196 3211 50.060CF248*219*1745+71981-2017
6 Hebe185 3197 2206 80.216S241*201*1822+31977-2013
375 Ursula-194 3202 60.044C220*202*1863+71982-2012
702 Alauda195 3191 3202 70.055C222*204*1812+132001-2017
130 Elektra182 12183 2201 70.061G262*201*1542+102007-2018
48 Doris222 8200 3201 80.076CG272*212*1422+71981-2011

(1) Ceres  
    Being a 
fully-differentiated dwarf planet, Ceres has been treated differently than the rest of the asteroid population. Its highly-regular shape allows dimensions to be measured within 1% accuracy from just one well-observed 1984 occultation, and cannot be improved on by combining with lesser-quality observations. However, even the 1984 chords depart too much from a fitted ellipse to be taken at face value. An issue with the initial fitted ellipse (960*908) is a smaller equatorial to polar difference of 52km compared with a theoretical prediction of 64km that was independently confirmed by HST observations. Note that the equatorial tilt in 1984 was insignificant during the occultation and amounts to only a half-kilometre increase in the apparent polar diameter. Regarding the reported timings (maximum duration 75.3s), chord #12 was acknowledged to have an absolute uncertainty of 1s in a 1987 paper dealing with the analysis, and I've taken the view that individual timings derived for the other chords are likely to have an accuracy no better than 0.5, given the small 0.07 magnitude drop being measured and the timing residuals involved. Therefore, time shifts of 1s for chord #12 and 0.5 for several others were applied to reduce the departures from a figure of revolution. For Occult users who wish to investigate the modifications themselves, the time shifts applied were:
Chord #1 +0.5 - both D and R
Chord #3 -0.5 - both D and R
Chord #7 +0.5 - R only
Chord #10 -0.5 - D only
Chord #12 -1.0 - both D and R
The resulting dimensions of 964*964*904 now have an equatorial-to-polar difference more in line with prediction. Subsequently the Dawn mission measured dimensions of 965.2*961.2*891.2 2.0.

(4) Vesta
    The mean diameter of Vesta from Dawn mission results is 525.40.2 km (572.6*557.2*446.4). The occultation diameter differs by only 4%, despite the limited number of observations Vesta has had at its current stage-1 status.

(65) Cybele  

    Observations prior to 2014 were puzzling. The only multiple-chord event produced a well-constrained three-chord ellipse of 245*198km in 1979, and the length of the other single chords were no greater than the derived mean diameter of 207km. If Cybele has the 0.05 albedo typical of its taxonomic class and outer main-belt location, its diameter ought to be in the vicinity of 280km, ranking it in the top ten MBAs. Its brief six-hour rotation period probably rules it out as a double asteroid, and lightcurve amplitudes within a 0.12-mag range imply it is not particularly elongated, which puts the 1979 ellipse at odds with a mean diameter anywhere near 280km. UPDATE - as of 2017, four more occultations have been observed and the mean diameter has increased substantially to 239km, close to the IRAS value and moving it up to 14th in the table of large MBAs.

Acknowledgements

References

  1. Herald, D. Occult4 software, 2008. http://www.lunar-occultations.com/iota/occult4.htm

  2. Tedesco, E.F. IRAS Minor Planet Survey. Diameters sourced from the ASTORB database. ftp://ftp.lowell.edu/pub/elgb/astorb.dat.gz or ftp://ftp.lowell.edu/pub/elgb/astorb.dat

  3. Usui, F. AcuA v1 catalogue, 2011 from the AKARI/IRC Mid-Infrared Survey 2006-2007. http://vizier.u-strasbg.fr/viz-bin/VizieR-2?-kw.cat=2297

  4. Tholen, D.J. Taxonomic classification system. 1989. http://sbn.psi.edu/pds/resource/taxonomy.html

  5. Millis, R.L, Wasserman L.H and others. The Size, Shape, Density, and Albedo of Ceres from Its Occultation of BD+8471. http://www.lpl.arizona.edu/~umpire/professional/papers/cerespaper.pdf