IOTA/IOTA-ES occultation update for (12) Victoria / 2UCAC 37654105 event on 2008 Mar 30, 01:23 UT Visible from SE USA Summary ------- On 2008 Mar 30 UT, the 113 km diameter asteroid (12) Victoria will occult a 12.3 mag star in the constellation Aries for observers along a path across SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.5 mag (the magnitude of the asteroid) for at most 2.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 65 * date and approx. time of event: 2008 Mar 30, 01:25 - 2008 Mar 30, 01:26 UT * magnitude of target star: 12.3 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 2.8 * Moon: 49 % sunlit, 128° distance * Sun: 40° distance * rough path description: SE USA The occultation path -------------------- * approximate projected width [km]: 115 * 1 sigma uncertainty interval [path widths]: +/- 0.93 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .046) * 1 sigma uncertainty ellipse (major, minor, PA): ( .046", .046", 90° ) * approx speed of asteroid's shadow [km/s]: 40.7356 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 37654105 by 12 Victoria on 2008 Mar 30 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 -107 0 0 30 25 52 1 25 28 38 268 -1 29 54 36 30 57 11 28 56 34 31 55 36 -106 0 0 30 20 4 1 25 29 37 268 -2 29 48 47 30 51 25 28 50 42 31 49 52 -105 0 0 30 13 57 1 25 31 37 269 -3 29 42 38 30 45 19 28 44 31 31 43 49 -104 0 0 30 7 31 1 25 32 36 270 -3 29 36 10 30 38 54 28 38 1 31 37 26 -103 0 0 30 0 45 1 25 33 35 270 -4 29 29 23 30 32 10 28 31 10 31 30 45 -102 0 0 29 53 39 1 25 35 34 271 -5 29 22 16 30 25 6 28 24 1 31 23 44 -101 0 0 29 46 15 1 25 36 33 271 -6 29 14 50 30 17 43 28 16 31 31 16 24 -100 0 0 29 38 31 1 25 37 32 272 -7 29 7 4 30 10 0 28 8 42 31 8 44 - 99 0 0 29 30 27 1 25 39 31 272 -8 28 58 59 30 1 59 28 0 34 31 0 46 - 98 0 0 29 22 4 1 25 40 30 273 -9 28 50 34 29 53 38 27 52 6 30 52 28 - 97 0 0 29 13 22 1 25 41 29 274 -10 28 41 50 29 44 58 27 43 19 30 43 52 - 96 0 0 29 4 21 1 25 42 29 274 -11 28 32 47 29 35 58 27 34 12 30 34 56 - 95 0 0 28 55 1 1 25 44 28 275 -11 28 23 25 29 26 40 27 24 47 30 25 41 - 94 0 0 28 45 22 1 25 45 27 275 -12 28 13 44 29 17 3 27 15 2 30 16 8 - 93 0 0 28 35 23 1 25 46 26 276 -13 28 3 43 29 7 6 27 4 57 30 6 15 - 92 0 0 28 25 6 1 25 47 25 276 -14 27 53 24 28 56 51 26 54 34 29 56 4 - 91 0 0 28 14 29 1 25 48 24 277 -15 27 42 45 28 46 17 26 43 52 29 45 33 - 90 0 0 28 3 34 1 25 49 23 277 -16 27 31 48 28 35 24 26 32 51 29 34 44 - 89 0 0 27 52 20 1 25 50 22 278 -17 27 20 32 28 24 12 26 21 30 29 23 37 - 88 0 0 27 40 48 1 25 51 21 278 -18 27 8 57 28 12 41 26 9 51 29 12 11 - 87 0 0 27 28 56 1 25 52 21 279 -19 26 57 4 28 0 52 25 57 54 29 0 26 - 86 0 0 27 16 47 1 25 53 20 279 -20 26 44 52 27 48 45 25 45 38 28 48 23 - 85 0 0 27 4 18 1 25 54 19 280 -21 26 32 21 27 36 19 25 33 3 28 36 1 - 84 0 0 26 51 32 1 25 54 18 280 -21 26 19 32 27 23 35 25 20 10 28 23 21 - 83 0 0 26 38 27 1 25 55 17 281 -22 26 6 25 27 10 33 25 6 58 28 10 23 - 82 0 0 26 25 4 1 25 56 16 281 -23 25 53 0 26 57 12 24 53 29 27 57 7 - 81 0 0 26 11 24 1 25 57 15 281 -24 25 39 17 26 43 34 24 39 41 27 43 33 - 80 0 0 25 57 25 1 25 57 14 282 -25 25 25 16 26 29 37 24 25 36 27 29 42 - 79 0 0 25 43 9 1 25 58 13 282 -26 25 10 57 26 15 24 24 11 13 27 15 32 - 78 0 0 25 28 35 1 25 58 12 283 -27 24 56 21 26 0 52 23 56 32 27 1 5 - 77 0 0 25 13 44 1 25 59 11 283 -28 24 41 27 25 46 3 23 41 34 26 46 21 - 76 0 0 24 58 35 1 25 59 10 284 -29 24 26 16 25 30 57 23 26 19 26 31 19 - 75 0 0 24 43 10 1 26 0 9 284 -30 24 10 48 25 15 34 23 10 47 26 16 1 - 74 0 0 24 27 27 1 26 0 8 284 -31 23 55 4 24 59 54 22 54 57 26 0 25 - 73 0 0 24 11 28 1 26 1 7 285 -32 23 39 2 24 43 57 22 38 51 25 44 33 - 72 0 0 23 55 12 1 26 1 7 285 -33 23 22 44 24 27 44 22 22 29 25 28 24 - 71 0 0 23 38 40 1 26 1 6 286 -34 23 6 10 24 11 15 22 5 51 25 11 59 - 70 0 0 23 21 52 1 26 1 5 286 -35 22 49 20 23 54 29 21 48 56 24 55 18 - 69 0 0 23 4 49 1 26 2 4 287 -36 22 32 14 23 37 27 21 31 46 24 38 21 - 68 0 0 22 47 29 1 26 2 3 287 -36 22 14 52 23 20 10 21 14 20 24 21 8 - 67 0 0 22 29 55 1 26 2 2 287 -37 21 57 15 23 2 38 20 56 39 24 3 40 - 66 0 0 22 12 5 1 26 2 1 288 -38 21 39 23 22 44 50 20 38 42 23 45 56 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: 2UCAC 37654105 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 08 26.4146 DE: +16 35 46.741 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .045, .045 ) * V mag [mag]: 12.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (12) Victoria approx. diameter [km]: 113 approx. diameter ["]: .049 distance from Earth [AU]: 3.17200 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1556 number of rejected observations: 181 time covered by the observations: 1907 Aug 29 - 2008 Feb 06 1 sigma uncertainty ellipse (major, minor, PA): 0.007, 0.006, 82° remarks: * orbital elements for (12) Victoria : Mean anomaly = 95.25102156 deg Arg. of pericenter = 69.62767221 deg Long. of node = 235.53704758 deg Inclination = 8.36343918 deg Eccentricity = 0.22029327 Semimajor axis = 2.33439616 AU Perihelion dist = 1.82014440 AU Mag: H = 7.17, G = 0.22 Epoch of elements : MJD 54555.05800000 TDT (2008 Mar 30.058) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 30 12 Victoria 1h 23.5m UT 12.3 3 8 26.415 16 35 46.742UCAC 37654105 0.0 12.5 113 2.8 3.172 4.329 13.72 -161.5684 16.593 160.26 3.85 1.3911 -0.03973 0.17618 22.45327 4.94941 0.00352 0.00091 2000 93.8532992008 325.00000 69.627672235.537048 8.3634390.22029327 2.3343962 1.8201444 7.2 5.00.22 RATE 2.7633910 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.046 0.046 90 1.93 0.046 0 54553.5020080330_654105 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org