IOTA/IOTA-ES occultation update for (2337) Boubin / TYC 0857-00092-1 event on 2007 Aug 04, 10:36 UT Visible from Australia Summary ------- On 2007 Aug 04 UT, the 25 km diameter asteroid (2337) Boubin will occult a 10.3 mag star in the constellation Virgo for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.4 mag to 17.7 mag (the magnitude of the asteroid) for at most 0.6 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: 23 * date and approx. time of event: 2007 Aug 04, 10:33 - 2007 Aug 04, 10:39 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 7.4 * estimated maximum duration [s]: 0.6 * Moon: 66 % sunlit, 148° distance * Sun: 41° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 2.95 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .029", 117° ) * approx speed of asteroid's shadow [km/s]: 39.7211 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0857-00092-1 by 2337 Boubin on 2007 Aug 04 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 - 31 0 0 32 34 23 10 33 59 0 80 39 32 27 31 32 41 16 .. .. .. 33 21 50 - 30 0 0 32 43 10 10 33 59 1 80 40 32 36 18 32 50 2 31 55 49 33 30 32 - 29 0 0 32 51 29 10 33 59 2 81 41 32 44 38 32 58 20 32 4 12 33 38 47 - 28 0 0 32 59 19 10 33 59 3 82 42 32 52 28 33 6 9 32 12 6 33 46 32 - 27 0 0 33 6 40 10 33 59 4 82 42 32 59 50 33 13 30 32 19 31 33 53 50 - 26 0 0 33 13 33 10 34 0 4 83 43 33 6 44 33 20 23 32 26 28 34 0 40 - 25 0 0 33 19 58 10 34 0 5 83 44 33 13 9 33 26 47 32 32 56 34 7 1 - 24 0 0 33 25 55 10 34 0 6 84 45 33 19 6 33 32 43 32 38 56 34 12 55 - 23 0 0 33 31 23 10 34 0 7 84 46 33 24 35 33 38 11 32 44 27 34 18 20 - 22 0 0 33 36 23 10 34 1 8 85 47 33 29 36 33 43 11 32 49 30 34 23 18 - 21 0 0 33 40 56 10 34 1 9 85 47 33 34 8 33 47 43 32 54 4 34 27 48 - 20 0 0 33 45 0 10 34 1 9 86 48 33 38 13 33 51 47 32 58 11 34 31 50 - 19 0 0 33 48 36 10 34 2 10 87 49 33 41 49 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24 -26 27 22 -27 22 50 -25 45 54 138 0 0 -26 48 56 10 39 18 9 285 -31 -26 55 57 -26 41 56 -27 37 17 -26 0 34 139 0 0 -27 2 59 10 39 18 8 284 -32 -27 9 58 -26 55 59 -27 51 13 -26 14 43 140 0 0 -27 16 30 10 39 18 7 284 -33 -27 23 29 -27 9 32 -28 4 38 -26 28 21 141 0 0 -27 29 31 10 39 19 7 283 -33 -27 36 29 -27 22 33 -28 17 32 -26 41 28 142 0 0 -27 42 1 10 39 19 6 283 -34 -27 48 58 -27 35 4 -28 29 57 -26 54 4 143 0 0 -27 54 1 10 39 19 5 282 -35 -28 0 57 -27 47 4 -28 41 50 -27 6 9 144 0 0 -28 5 30 10 39 19 4 282 -36 -28 12 25 -27 58 34 -28 53 14 -27 17 44 145 0 0 -28 16 28 10 39 20 3 281 -37 -28 23 23 -28 9 34 -29 4 7 -27 28 48 146 0 0 -28 26 57 10 39 20 2 281 -38 -28 33 50 -28 20 3 -29 14 31 -27 39 21 147 0 0 -28 36 55 10 39 20 1 280 -39 -28 43 48 -28 30 2 -29 24 24 -27 49 24 148 0 0 -28 46 23 10 39 20 0 280 -40 -28 53 16 -28 39 31 -29 33 48 -27 58 57 Data for the target star ------------------------ * name: TYC 0857-00092-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 41 23.8100 DE: +08 35 26.070 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .018 ) * V mag [mag]: 10.3 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2337) Boubin approx. diameter [km]: 25 approx. diameter ["]: .010 distance from Earth [AU]: 3.44300 * orbital information: orbit source: Preston date of fit: 2007 Jul 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 522 number of rejected observations: 13 time covered by the observations: 1970 Apr 29 - 2007 May 17 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.024, 127° remarks: * orbital elements for (2337) Boubin : Mean anomaly = 103.49908000 deg Arg. of pericenter = 26.84650076 deg Long. of node = 37.46806275 deg Inclination = 14.34570750 deg Eccentricity = 0.16931893 Semimajor axis = 2.59305419 AU Perihelion dist = 2.15400103 AU Mag: H = 11.91, G = 0.15 Epoch of elements : MJD 54316.44200000 TDT (2007 Aug 04.442) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 04 2337 Boubin 10h 36.7m UT 10.3 11 41 23.810 8 35 26.07TYC 0857-00092-1 11.4 17.7 25 0.6 3.443 3.312 -29.40 63.568 8.599 22.37 17.28 10.6109 .01621 .02871 19.23823-11.51232 0.00352 -0.00105 2000 101.9785062007 729.00000 26.846501 37.468063 14.3457070.169318932.593054192.1540010312.05 0.15 RATE 2.3604060 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.039 0.029 117.0 3.950 0.030 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 29, 02:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org