IOTA/IOTA-ES occultation update for (455) Bruchsalia / TYC 4975-01037-1 event on 2008 May 15, 02:37 UT Visible from Caribbean, Mexico Summary ------- On 2008 May 15 UT, the 84 km diameter asteroid (455) Bruchsalia will occult a 11.8 mag star in the constellation Virgo for observers along a path across Caribbean, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.8 mag to 13.4 mag (the magnitude of the asteroid) for at most 6.4 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: 49 * date and approx. time of event: 2008 May 15, 02:29 - 2008 May 15, 02:43 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 1.8 * estimated maximum duration [s]: 6.4 * Moon: 78 % sunlit, 34° distance * Sun: 154° distance * rough path description: Caribbean, Mexico The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 1.32 * 1 sigma uncertainty interval [seconds]: +/- 7.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .067 +/- .074) * 1 sigma uncertainty ellipse (major, minor, PA): ( .074", .067", 1° ) * approx speed of asteroid's shadow [km/s]: 13.1602 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4975-01037-1 by 455 Bruchsalia on 2008 May 15 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 -124 0 0 19 50 44 2 43 51 26 102 -1 20 14 50 19 26 42 21 18 45 18 23 29 -123 0 0 19 48 30 2 43 48 26 102 -2 20 12 36 19 24 28 21 16 31 18 21 15 -122 0 0 19 46 15 2 43 44 27 102 -2 20 10 21 19 22 12 21 14 16 18 18 59 -121 0 0 19 43 59 2 43 40 28 103 -3 20 8 5 19 19 56 21 11 59 18 16 43 -120 0 0 19 41 42 2 43 36 29 103 -4 20 5 48 19 17 39 21 9 42 18 14 26 -119 0 0 19 39 23 2 43 32 30 104 -5 20 3 29 19 15 21 21 7 24 18 12 7 -118 0 0 19 37 4 2 43 28 31 104 -6 20 1 11 19 13 2 21 5 5 18 9 48 -117 0 0 19 34 45 2 43 24 32 105 -7 19 58 51 19 10 42 21 2 45 18 7 28 -116 0 0 19 32 24 2 43 19 33 105 -8 19 56 30 19 8 21 21 0 25 18 5 8 -115 0 0 19 30 2 2 43 15 34 105 -9 19 54 9 19 6 0 20 58 3 18 2 46 -114 0 0 19 27 40 2 43 10 35 106 -9 19 51 46 19 3 38 20 55 41 18 0 24 -113 0 0 19 25 17 2 43 5 36 106 -10 19 49 24 19 1 15 20 53 19 17 58 1 -112 0 0 19 22 54 2 43 0 36 107 -11 19 47 0 18 58 51 20 50 55 17 55 38 -111 0 0 19 20 30 2 42 55 37 107 -12 19 44 36 18 56 27 20 48 31 17 53 14 -110 0 0 19 18 5 2 42 50 38 108 -13 19 42 12 18 54 3 20 46 7 17 50 49 -109 0 0 19 15 40 2 42 45 39 108 -14 19 39 46 18 51 37 20 43 41 17 48 24 -108 0 0 19 13 15 2 42 40 40 109 -15 19 37 21 18 49 12 20 41 16 17 45 58 -107 0 0 19 10 49 2 42 35 41 109 -15 19 34 55 18 46 46 20 38 50 17 43 32 -106 0 0 19 8 22 2 42 29 42 110 -16 19 32 28 18 44 19 20 36 24 17 41 6 -105 0 0 19 5 55 2 42 24 43 111 -17 19 30 2 18 41 53 20 33 57 17 38 39 -104 0 0 19 3 28 2 42 18 44 111 -18 19 27 35 18 39 26 20 31 30 17 36 12 -103 0 0 19 1 1 2 42 12 44 112 -19 19 25 7 18 36 58 20 29 2 17 33 45 -102 0 0 18 58 34 2 42 6 45 112 -20 19 22 40 18 34 31 20 26 35 17 31 17 -101 0 0 18 56 6 2 42 1 46 113 -20 19 20 12 18 32 3 20 24 7 17 28 49 -100 0 0 18 53 38 2 41 55 47 114 -21 19 17 44 18 29 35 20 21 39 17 26 22 - 99 0 0 18 51 10 2 41 49 48 114 -22 19 15 16 18 27 7 20 19 11 17 23 54 - 98 0 0 18 48 42 2 41 42 49 115 -23 19 12 48 18 24 39 20 16 43 17 21 26 - 97 0 0 18 46 14 2 41 36 50 116 -24 19 10 20 18 22 11 20 14 15 17 18 58 - 96 0 0 18 43 46 2 41 30 50 117 -24 19 7 52 18 19 43 20 11 47 17 16 30 - 95 0 0 18 41 18 2 41 23 51 117 -25 19 5 24 18 17 15 20 9 19 17 14 2 - 94 0 0 18 38 50 2 41 17 52 118 -26 19 2 57 18 14 48 20 6 52 17 11 34 - 93 0 0 18 36 23 2 41 10 53 119 -27 19 0 29 18 12 20 20 4 24 17 9 7 - 92 0 0 18 33 55 2 41 4 54 120 -28 18 58 1 18 9 53 20 1 56 17 6 39 - 91 0 0 18 31 28 2 40 57 55 121 -28 18 55 34 18 7 25 19 59 29 17 4 12 - 90 0 0 18 29 1 2 40 50 55 122 -29 18 53 7 18 4 58 19 57 2 17 1 45 - 89 0 0 18 26 35 2 40 44 56 123 -30 18 50 41 18 2 32 19 54 36 16 59 19 - 88 0 0 18 24 8 2 40 37 57 124 -31 18 48 14 18 0 6 19 52 9 16 56 52 - 87 0 0 18 21 43 2 40 30 58 125 -32 18 45 49 17 57 40 19 49 43 16 54 27 - 86 0 0 18 19 17 2 40 23 58 126 -32 18 43 23 17 55 14 19 47 18 16 52 1 - 85 0 0 18 16 52 2 40 16 59 127 -33 18 40 58 17 52 50 19 44 53 16 49 36 - 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Uncertainty in time = +/- 8 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 4975-01037-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 08 47.5355 DE: -01 22 32.146 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .066, .073 ) * V mag [mag]: 11.8 * B mag [mag]: 12.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (455) Bruchsalia approx. diameter [km]: 84 approx. diameter ["]: .056 distance from Earth [AU]: 2.06600 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 736 number of rejected observations: 109 time covered by the observations: 1900 May 22 - 2008 May 01 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.013, 116° remarks: * orbital elements for (455) Bruchsalia : Mean anomaly = 258.39517578 deg Arg. of pericenter = 272.26874875 deg Long. of node = 76.61050769 deg Inclination = 12.02378238 deg Eccentricity = 0.29459019 Semimajor axis = 2.65453870 AU Perihelion dist = 1.87253763 AU Mag: H = 8.76, G = 0.15 Epoch of elements : MJD 54601.10900000 TDT (2008 May 15.109) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 15 455 Bruchsalia 2h 37.0m UT 11.8 14 8 47.536- 1 22 32.15TYC 4975-01037-1 12.7 13.4 84 6.4 2.066 -2.107 1.06 -60.2659 -1.376 139.83 18.93 2.6175 0.01041 0.31959 -7.42372 0.25167 0.00185 -0.00171 2000 258.1424492008 514.00000272.268749 76.610508 12.0237820.29459019 2.6545387 1.8725376 8.9 5.00.15 RATE 2.2788750 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.074 0.067 1 2.32 0.074 0 54594.5020080515_1037-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org