IOTA/IOTA-ES occultation update for (76) Freia / TYC 1307-00191-1 event on 2008 Jan 13, 00:29 UT Visible from N Africa, Caribbean, Mexico Summary ------- On 2008 Jan 13 UT, the 184 km diameter asteroid (76) Freia will occult a 8.8 mag star in the constellation Orion for observers along a path across N Africa, Caribbean, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 12.2 mag (the magnitude of the asteroid) for at most 20.6 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: . The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2008 Jan 13, 00:17 - 2008 Jan 13, 00:41 UT * magnitude of target star: 8.8 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 20.6 * Moon: 21 % sunlit, 101° distance * Sun: 156° distance * rough path description: N Africa, Caribbean, Mexico The occultation path -------------------- * approximate projected width [km]: 185 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .028", 90° ) * approx speed of asteroid's shadow [km/s]: 8.9129 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1307-00191-1 by 76 Freia on 2008 Jan 13 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 -127 0 0 7 43 43 0 41 12 0 69 23 8 37 26 .. .. .. 9 0 2 .. .. .. -126 0 0 8 6 16 0 41 12 1 69 22 8 59 58 7 12 39 9 22 33 6 50 10 -125 0 0 8 28 45 0 41 12 2 70 21 9 22 27 7 35 9 9 45 2 7 12 40 -124 0 0 8 51 11 0 41 11 3 70 20 9 44 52 7 57 36 10 7 26 7 35 7 -123 0 0 9 13 33 0 41 10 4 70 19 10 7 13 8 19 58 10 29 47 7 57 30 -122 0 0 9 35 50 0 41 9 5 70 18 10 29 29 8 42 16 10 52 3 8 19 48 -121 0 0 9 58 2 0 41 8 6 70 17 10 51 40 9 4 30 11 14 13 8 42 2 -120 0 0 10 20 9 0 41 6 7 70 16 11 13 45 9 26 38 11 36 18 9 4 11 -119 0 0 10 42 9 0 41 4 8 71 15 11 35 44 9 48 40 11 58 17 9 26 13 -118 0 0 11 4 3 0 41 2 9 71 14 11 57 37 10 10 35 12 20 9 9 48 10 -117 0 0 11 25 51 0 41 0 10 71 13 12 19 23 10 32 24 12 41 54 10 9 59 -116 0 0 11 47 31 0 40 57 12 71 12 12 41 1 10 54 6 13 3 31 10 31 42 -115 0 0 12 9 3 0 40 55 13 71 11 13 2 32 11 15 40 13 25 1 10 53 16 -114 0 0 12 30 27 0 40 52 14 72 10 13 23 54 11 37 6 13 46 22 11 14 43 -113 0 0 12 51 42 0 40 49 15 72 9 13 45 7 11 58 24 14 7 35 11 36 2 -112 0 0 13 12 49 0 40 45 16 72 8 14 6 11 12 19 32 14 28 38 11 57 11 -111 0 0 13 33 46 0 40 42 17 72 7 14 27 6 12 40 31 14 49 32 12 18 11 -110 0 0 13 54 33 0 40 38 18 73 6 14 47 51 13 1 21 15 10 16 12 39 2 -109 0 0 14 15 10 0 40 34 19 73 5 15 8 26 13 22 0 15 30 50 12 59 42 -108 0 0 14 35 37 0 40 30 20 73 4 15 28 50 13 42 29 15 51 13 13 20 12 -107 0 0 14 55 52 0 40 25 21 73 3 15 49 3 14 2 48 16 11 25 13 40 32 -106 0 0 15 15 57 0 40 21 22 74 2 16 9 5 14 22 55 16 31 25 14 0 40 -105 0 0 15 35 50 0 40 16 23 74 1 16 28 55 14 42 50 16 51 14 14 20 37 -104 0 0 15 55 31 0 40 11 24 74 0 16 48 33 15 2 34 17 10 51 14 40 22 -103 0 0 16 15 0 0 40 6 25 74 -1 17 7 59 15 22 6 17 30 16 14 59 54 -102 0 0 16 34 16 0 40 1 26 75 -2 17 27 12 15 41 25 17 49 29 15 19 15 -101 0 0 16 53 20 0 39 55 27 75 -3 17 46 13 16 0 32 18 8 28 15 38 23 -100 0 0 17 12 10 0 39 49 28 75 -4 18 5 1 16 19 25 18 27 14 15 57 18 - 99 0 0 17 30 47 0 39 44 29 76 -5 18 23 35 16 38 6 18 45 47 16 15 59 - 98 0 0 17 49 11 0 39 38 30 76 -6 18 41 55 16 56 32 19 4 6 16 34 27 - 97 0 0 18 7 21 0 39 31 31 76 -7 19 0 2 17 14 45 19 22 12 16 52 42 - 96 0 0 18 25 17 0 39 25 32 77 -8 19 17 55 17 32 44 19 40 3 17 10 42 - 95 0 0 18 42 58 0 39 19 32 77 -9 19 35 33 17 50 29 19 57 40 17 28 28 - 94 0 0 19 0 25 0 39 12 33 77 -10 19 52 56 18 7 59 20 15 2 17 46 0 - 93 0 0 19 17 37 0 39 5 34 78 -11 20 10 5 18 25 15 20 32 10 18 3 17 - 92 0 0 19 34 35 0 38 58 35 78 -12 20 26 59 18 42 15 20 49 2 18 20 19 - 91 0 0 19 51 17 0 38 51 36 79 -13 20 43 38 18 59 1 21 5 40 18 37 5 - 90 0 0 20 7 44 0 38 44 37 79 -14 21 0 2 19 15 31 21 22 2 18 53 37 - 89 0 0 20 23 55 0 38 37 38 79 -15 21 16 10 19 31 46 21 38 8 19 9 53 - 88 0 0 20 39 51 0 38 29 39 80 -16 21 32 2 19 47 45 21 53 59 19 25 54 - 87 0 0 20 55 31 0 38 22 40 80 -17 21 47 39 20 3 28 22 9 34 19 41 39 - 86 0 0 21 10 55 0 38 14 41 81 -18 22 2 59 20 18 56 22 24 54 19 57 7 - 85 0 0 21 26 3 0 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24 1 62 267 -85 25 52 12 24 10 2 26 13 42 23 48 37 1 0 0 24 50 48 0 23 51 61 268 -84 25 41 58 23 59 43 26 3 30 23 38 17 2 0 0 24 40 14 0 23 41 60 269 -84 25 31 27 23 49 6 25 53 0 23 27 39 3 0 0 24 29 23 0 23 31 60 269 -83 25 20 39 23 38 12 25 42 13 23 16 44 4 0 0 24 18 14 0 23 22 59 270 -82 25 9 33 23 27 1 25 31 9 23 5 31 5 0 0 24 6 48 0 23 12 58 271 -81 24 58 11 23 15 32 25 19 47 22 54 1 6 0 0 23 55 5 0 23 3 57 271 -81 24 46 31 23 3 46 25 8 8 22 42 14 7 0 0 23 43 5 0 22 53 56 272 -80 24 34 33 22 51 42 24 56 12 22 30 9 8 0 0 23 30 48 0 22 44 55 273 -79 24 22 19 22 39 22 24 43 59 22 17 47 9 0 0 23 18 13 0 22 34 54 273 -78 24 9 48 22 26 44 24 31 29 22 5 8 10 0 0 23 5 22 0 22 25 53 274 -77 23 57 0 22 13 50 24 18 43 21 52 13 11 0 0 22 52 14 0 22 16 52 274 -76 23 43 55 22 0 38 24 5 39 21 39 0 12 0 0 22 38 49 0 22 7 52 275 -76 23 30 33 21 47 10 23 52 18 21 25 30 13 0 0 22 25 7 0 21 58 51 276 -75 23 16 54 21 33 25 23 38 41 21 11 44 14 0 0 22 11 9 0 21 49 50 276 -74 23 2 59 21 19 23 23 24 48 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-31 9 6 0 7 18 45 9 28 34 6 56 16 59 0 0 7 49 54 0 17 35 5 290 -29 8 43 35 6 56 19 9 6 10 6 33 51 60 0 0 7 27 27 0 17 34 4 290 -28 8 21 8 6 33 51 8 43 43 6 11 22 61 0 0 7 4 57 0 17 33 3 290 -27 7 58 38 6 11 21 8 21 13 5 48 52 62 0 0 6 42 25 0 17 33 2 290 -26 7 36 7 5 48 50 7 58 42 5 26 21 63 0 0 6 19 53 0 17 32 1 290 -25 7 13 34 5 26 17 7 36 9 5 3 48 64 0 0 5 57 20 0 17 32 0 291 -24 6 51 1 .. .. .. 7 13 36 .. .. .. Data for the target star ------------------------ * name: TYC 1307-00191-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 51 40.2927 DE: +20 27 26.269 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .023, .024 ) * V mag [mag]: 8.8 * B mag [mag]: 9.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (76) Freia approx. diameter [km]: 184 approx. diameter ["]: .131 distance from Earth [AU]: 1.93500 * 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): 0.022, 0.015, 91° remarks: * orbital elements for (76) Freia : Mean anomaly = 358.29514574 deg Arg. of pericenter = 253.98254470 deg Long. of node = 204.52995738 deg Inclination = 2.11594675 deg Eccentricity = 0.16314615 Semimajor axis = 3.41849775 AU Perihelion dist = 2.86078299 AU Mag: H = 7.85, G = 0.15 Epoch of elements : MJD 54478.02000000 TDT (2008 Jan 13.020) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 13 76 Freia 0h 29.4m UT 8.8 5 51 40.293 20 27 26.27TYC 1307-00191-1 9.8 12.2 184 20.6 1.935 -1.625 0.38 -31.304 20.457 174.74 -21.61 0.4896 .00146 .12620 -5.03004 0.08237 0.00246 0.00032 2000 357.0445252008 1 5.00000253.982545204.529957 2.1159470.163146153.418497752.860782997.905 0.15 RATE 1.5593770 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.032 0.028 90.5 1.210 0.028 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 11, 02:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org