IOTA/IOTA-ES occultation update for (76) Freia / TYC 1307-00201-1 event on 2008 Jan 17, 02:22 UT Visible from Sicily, Spain, S Canada, NW USA Summary ------- On 2008 Jan 17 UT, the 184 km diameter asteroid (76) Freia will occult a 10.6 mag star in the constellation Taurus for observers along a path across Sicily, Spain, S Canada, NW USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 12.3 mag (the magnitude of the asteroid) for at most 23.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2008 Jan 17, 02:10 - 2008 Jan 17, 02:34 UT * magnitude of target star: 10.6 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 23.4 * Moon: 64 % sunlit, 46° distance * Sun: 151° distance * rough path description: Sicily, Spain, S Canada, NW USA The occultation path -------------------- * approximate projected width [km]: 213 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .021", 91° ) * approx speed of asteroid's shadow [km/s]: 7.8795 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1307-00201-1 by 76 Freia on 2008 Jan 17 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -169 0 0 30 1 11 2 34 2 0 66 22 31 4 3 .. .. .. 31 25 36 .. .. .. -168 0 0 30 24 11 2 34 1 1 67 21 31 27 5 29 22 0 31 48 38 .. .. .. -167 0 0 30 47 8 2 34 1 2 67 20 31 50 2 29 44 56 32 11 35 .. .. .. -166 0 0 31 10 0 2 34 0 3 68 19 32 12 55 30 7 48 32 34 29 .. .. .. -165 0 0 31 32 48 2 33 59 4 68 18 32 35 43 30 30 35 32 57 17 30 9 35 -164 0 0 31 55 30 2 33 58 5 69 18 32 58 25 30 53 18 33 19 59 30 32 18 -163 0 0 32 18 7 2 33 57 6 70 17 33 21 2 31 15 54 33 42 36 30 54 54 -162 0 0 32 40 37 2 33 55 7 70 16 33 43 32 31 38 25 34 5 6 31 17 25 -161 0 0 33 3 1 2 33 53 8 71 15 34 5 55 32 0 49 34 27 29 31 39 50 -160 0 0 33 25 17 2 33 51 9 71 14 34 28 11 32 23 6 34 49 45 32 2 7 -159 0 0 33 47 26 2 33 49 10 72 13 34 50 19 32 45 16 35 11 52 32 24 17 -158 0 0 34 9 27 2 33 46 10 72 12 35 12 19 33 7 17 35 33 51 32 46 19 -157 0 0 34 31 19 2 33 43 11 73 11 35 34 9 33 29 11 35 55 42 33 8 12 -156 0 0 34 53 2 2 33 40 12 73 10 35 55 51 33 50 55 36 17 23 33 29 57 -155 0 0 35 14 35 2 33 37 13 74 10 36 17 23 34 12 30 36 38 54 33 51 33 -154 0 0 35 35 59 2 33 34 14 75 9 36 38 45 34 33 56 37 0 16 34 12 59 -153 0 0 35 57 13 2 33 30 15 75 8 36 59 57 34 55 11 37 21 27 34 34 15 -152 0 0 36 18 16 2 33 26 16 76 7 37 20 58 35 16 16 37 42 27 34 55 21 -151 0 0 36 39 8 2 33 22 16 76 6 37 41 48 35 37 10 38 3 16 35 16 16 -150 0 0 36 59 49 2 33 18 17 77 5 38 2 26 35 57 54 38 23 54 35 37 0 -149 0 0 37 20 18 2 33 14 18 78 4 38 22 53 36 18 25 38 44 19 35 57 32 -148 0 0 37 40 35 2 33 10 19 78 4 38 43 7 36 38 45 39 4 33 36 17 53 -147 0 0 38 0 40 2 33 5 20 79 3 39 3 10 36 58 53 39 24 34 36 38 2 -146 0 0 38 20 33 2 33 0 21 80 2 39 22 59 37 18 49 39 44 23 36 57 59 -145 0 0 38 40 13 2 32 55 21 80 1 39 42 36 37 38 32 40 3 58 37 17 43 -144 0 0 38 59 40 2 32 50 22 81 0 40 1 59 37 58 2 40 23 21 37 37 14 -143 0 0 39 18 53 2 32 45 23 82 -1 40 21 9 38 17 19 40 42 30 37 56 32 -142 0 0 39 37 53 2 32 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34 59 193 -55 51 47 22 49 51 45 52 7 16 49 32 18 - 56 0 0 50 46 10 2 21 25 59 194 -55 51 44 18 49 48 37 52 4 12 49 29 10 - 55 0 0 50 42 49 2 21 17 59 196 -55 51 40 58 49 45 13 52 0 53 49 25 46 - 54 0 0 50 39 12 2 21 8 59 198 -56 51 37 24 49 41 35 51 57 19 49 22 7 - 53 0 0 50 35 21 2 20 59 59 200 -56 51 33 34 49 37 41 51 53 31 49 18 12 - 52 0 0 50 31 14 2 20 51 59 201 -57 51 29 30 49 33 32 51 49 27 49 14 2 - 51 0 0 50 26 52 2 20 42 58 203 -57 51 25 10 49 29 7 51 45 8 49 9 37 - 50 0 0 50 22 14 2 20 33 58 205 -57 51 20 35 49 24 27 51 40 34 49 4 56 - 49 0 0 50 17 22 2 20 25 58 207 -58 51 15 45 49 19 32 51 35 45 49 0 0 - 48 0 0 50 12 14 2 20 16 58 208 -58 51 10 40 49 14 22 51 30 41 48 54 49 - 47 0 0 50 6 50 2 20 7 58 210 -59 51 5 20 49 8 55 51 25 22 48 49 22 - 46 0 0 50 1 12 2 19 59 57 212 -59 50 59 44 49 3 14 51 19 47 48 43 39 - 45 0 0 49 55 18 2 19 50 57 213 -59 50 53 53 48 57 17 51 13 57 48 37 41 - 44 0 0 49 49 8 2 19 41 57 215 -60 50 47 47 48 51 4 51 7 52 48 31 27 - 43 0 0 49 42 43 2 19 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254 -62 45 57 12 43 56 16 46 18 2 43 35 58 - 14 0 0 44 42 20 2 15 25 43 255 -62 45 43 13 43 42 8 46 4 4 43 21 48 - 13 0 0 44 28 1 2 15 16 43 256 -62 45 28 58 43 27 43 45 49 51 43 7 21 - 12 0 0 44 13 25 2 15 8 42 257 -62 45 14 27 43 13 3 45 35 22 42 52 40 - 11 0 0 43 58 33 2 15 0 42 258 -61 44 59 40 42 58 6 45 20 37 42 37 42 - 10 0 0 43 43 26 2 14 52 41 259 -61 44 44 38 42 42 55 45 5 36 42 22 29 - 9 0 0 43 28 4 2 14 44 40 260 -61 44 29 20 42 27 28 44 50 20 42 7 0 - 8 0 0 43 12 26 2 14 36 40 261 -60 44 13 47 42 11 45 44 34 48 41 51 16 - 7 0 0 42 56 33 2 14 28 39 262 -60 43 57 58 41 55 47 44 19 1 41 35 17 - 6 0 0 42 40 24 2 14 21 38 263 -60 43 41 54 41 39 34 44 2 58 41 19 2 - 5 0 0 42 24 0 2 14 13 38 264 -59 43 25 35 41 23 6 43 46 41 41 2 33 - 4 0 0 42 7 21 2 14 5 37 265 -59 43 9 0 41 6 23 43 30 8 40 45 48 - 3 0 0 41 50 27 2 13 58 36 266 -58 42 52 11 40 49 25 43 13 20 40 28 49 - 2 0 0 41 33 19 2 13 50 36 267 -58 42 35 6 40 32 13 42 56 17 40 11 35 - 1 0 0 41 15 56 2 13 43 35 268 -57 42 17 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2 12 4 23 279 -48 37 30 39 35 26 3 37 52 7 35 5 9 15 0 0 36 7 11 2 11 59 22 280 -48 37 9 52 35 5 12 37 31 21 34 44 17 16 0 0 35 46 11 2 11 53 22 280 -47 36 48 54 34 44 11 37 10 24 34 23 15 17 0 0 35 25 2 2 11 48 21 281 -46 36 27 46 34 23 0 36 49 17 34 2 3 18 0 0 35 3 42 2 11 43 20 282 -45 36 6 29 34 1 39 36 27 59 33 40 42 19 0 0 34 42 14 2 11 38 19 282 -45 35 45 1 33 40 9 36 6 32 33 19 12 20 0 0 34 20 36 2 11 34 18 283 -44 35 23 25 33 18 30 35 44 56 32 57 32 21 0 0 33 58 50 2 11 29 17 283 -43 35 1 39 32 56 43 35 23 11 32 35 45 22 0 0 33 36 55 2 11 25 16 284 -42 34 39 46 32 34 48 35 1 18 32 13 49 23 0 0 33 14 53 2 11 21 16 285 -41 34 17 44 32 12 45 34 39 17 31 51 46 24 0 0 32 52 44 2 11 17 15 285 -41 33 55 35 31 50 35 34 17 8 31 29 37 25 0 0 32 30 28 2 11 13 14 286 -40 33 33 19 31 28 19 33 54 52 31 7 20 26 0 0 32 8 5 2 11 10 13 286 -39 33 10 57 31 5 56 33 32 29 30 44 57 27 0 0 31 45 37 2 11 6 12 287 -38 32 48 28 30 43 28 33 10 1 30 22 29 28 0 0 31 23 3 2 11 3 11 287 -37 32 25 54 30 20 54 32 47 27 29 59 56 29 0 0 31 0 24 2 11 1 10 288 -36 32 3 15 29 58 16 32 24 47 29 37 18 30 0 0 30 37 41 2 10 58 9 288 -35 31 40 31 29 35 34 32 2 3 29 14 36 31 0 0 30 14 55 2 10 56 8 289 -35 31 17 44 29 12 48 31 39 15 28 51 50 32 0 0 29 52 5 2 10 54 7 289 -34 30 54 52 28 49 59 31 16 24 28 29 1 33 0 0 29 29 12 2 10 52 6 290 -33 30 31 58 28 27 7 30 53 29 28 6 10 34 0 0 29 6 16 2 10 50 5 290 -32 30 9 2 28 4 13 30 30 32 27 43 17 35 0 0 28 43 20 2 10 49 5 291 -31 29 46 3 27 41 18 30 7 33 27 20 22 36 0 0 28 20 22 2 10 48 4 291 -30 29 23 4 27 18 22 29 44 33 26 57 26 37 0 0 27 57 23 2 10 47 3 292 -29 29 0 3 26 55 25 29 21 31 .. .. .. 38 0 0 27 34 25 2 10 46 2 292 -28 28 37 2 26 32 29 28 58 30 .. .. .. 39 0 0 27 11 27 2 10 46 1 293 -27 28 14 2 26 9 33 28 35 29 .. .. .. 40 0 0 .. .. .. .. .. .. .. .. .. 27 51 3 .. .. .. 28 12 29 .. .. .. Data for the target star ------------------------ * name: TYC 1307-00201-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 49 11.0233 DE: +20 28 10.300 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .016 ) * V mag [mag]: 10.6 * B mag [mag]: 10.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (76) Freia approx. diameter [km]: 184 approx. diameter ["]: .129 distance from Earth [AU]: 1.96000 * orbital information: orbit source: Preston date of fit: 2008 Jan 10 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1086 number of rejected observations: 179 time covered by the observations: 1911 Jul 21 - 2008 Jan 10 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.014, 91° remarks: * orbital elements for (76) Freia : Mean anomaly = 358.93173749 deg Arg. of pericenter = 253.98192179 deg Long. of node = 204.52984113 deg Inclination = 2.11594536 deg Eccentricity = 0.16314504 Semimajor axis = 3.41849339 AU Perihelion dist = 2.86078317 AU Mag: H = 7.85, G = 0.15 Epoch of elements : MJD 54482.09900000 TDT (2008 Jan 17.099) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 17 76 Freia 2h 22.4m UT 10.6 5 49 11.023 20 28 10.30TYC 1307-00201-1 10.6 12.3 184 23.4 1.960 -1.418 0.56 -64.202 20.470 146.85 -20.88 2.3734 .01356 .50473 -4.44563 0.12536 0.00289 0.00032 2000 358.6044232008 115.00000253.981922204.529841 2.1159450.163145043.418493392.860783177.905 0.15 RATE 1.5593800 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.027 0.021 90.6 1.170 0.022 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 11, 02:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org