IOTA/IOTA-ES occultation update for (748) Simeisa / TYC 6842-01515-1 event on 2009 Apr 02, 07:13 UT Visible from Summary ------- On 2009 Apr 02 UT, the 103 km diameter asteroid (748) Simeisa will occult a 10.1 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 16.3 mag (the magnitude of the asteroid) for at most 16.4 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: 63 * date and approx. time of event: 2009 Apr 02, 06:57 - 2009 Apr 02, 07:16 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 16.4 * Moon: 47 % sunlit, 171° distance * Sun: 102° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 105 * 1 sigma uncertainty interval [path widths]: +/- 0.96 * 1 sigma uncertainty interval [seconds]: +/- 16.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .032", 89° ) * approx speed of asteroid's shadow [km/s]: 6.2692 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6842-01515-1 by 748 Simeisa on 2009 Apr 2 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 -120 0 0 -13 56 32 6 57 2 1 114 -71 -14 28 7 -13 25 1 -15 28 59 .. .. .. -119 0 0 -14 23 13 6 57 2 2 114 -72 -14 54 48 -13 51 42 -15 55 40 -12 51 24 -118 0 0 -14 49 52 6 57 3 3 114 -73 -15 21 27 -14 18 21 -16 22 19 -13 18 2 -117 0 0 -15 16 27 6 57 4 4 114 -73 -15 48 1 -14 44 56 -16 48 53 -13 44 38 -116 0 0 -15 42 57 6 57 5 5 113 -74 -16 14 32 -15 11 27 -17 15 22 -14 11 9 -115 0 0 -16 9 23 6 57 7 6 113 -74 -16 40 57 -15 37 53 -17 41 46 -14 37 36 -114 0 0 -16 35 43 6 57 10 7 113 -74 -17 7 16 -16 4 14 -18 8 5 -15 3 58 -113 0 0 -17 1 56 6 57 12 8 112 -75 -17 33 29 -16 30 28 -18 34 16 -15 30 14 -112 0 0 -17 28 3 6 57 15 9 112 -75 -17 59 35 -16 56 36 -19 0 20 -15 56 23 -111 0 0 -17 54 2 6 57 18 10 112 -75 -18 25 33 -17 22 36 -19 26 16 -16 22 25 -110 0 0 -18 19 53 6 57 22 11 112 -75 -18 51 22 -17 48 27 -19 52 3 -16 48 19 -109 0 0 -18 45 34 6 57 26 12 111 -75 -19 17 3 -18 14 10 -20 17 41 -17 14 4 -108 0 0 -19 11 6 6 57 30 13 111 -75 -19 42 33 -18 39 43 -20 43 8 -17 39 40 -107 0 0 -19 36 28 6 57 34 14 111 -75 -20 7 53 -19 5 7 -21 8 25 -18 5 6 -106 0 0 -20 1 38 6 57 39 15 110 -75 -20 33 2 -19 30 19 -21 33 31 -18 30 22 -105 0 0 -20 26 37 6 57 45 16 110 -75 -20 57 59 -19 55 20 -21 58 24 -18 55 26 -104 0 0 -20 51 24 6 57 50 18 109 -74 -21 22 44 -20 20 8 -22 23 5 -19 20 18 -103 0 0 -21 15 58 6 57 56 19 109 -74 -21 47 16 -20 44 44 -22 47 33 -19 44 58 -102 0 0 -21 40 19 6 58 2 20 109 -73 -22 11 34 -21 9 7 -23 11 47 -20 9 25 -101 0 0 -22 4 26 6 58 8 21 108 -73 -22 35 39 -21 33 16 -23 35 47 -20 33 38 -100 0 0 -22 28 18 6 58 15 22 108 -72 -22 59 29 -21 57 11 -23 59 32 -20 57 37 - 99 0 0 -22 51 55 6 58 22 23 107 -72 -23 23 3 -22 20 51 -24 23 2 -21 21 22 - 98 0 0 -23 15 17 6 58 30 24 107 -71 -23 46 22 -22 44 15 -24 46 16 -21 44 51 - 97 0 0 -23 38 22 6 58 37 25 106 -70 -24 9 25 -23 7 23 -25 9 14 -22 8 4 - 96 0 0 -24 1 11 6 58 45 26 106 -70 -24 32 12 -23 30 15 -25 31 55 -22 31 2 - 95 0 0 -24 23 44 6 58 53 27 106 -69 -24 54 41 -23 52 50 -25 54 18 -22 53 42 - 94 0 0 -24 45 58 6 59 2 28 105 -68 -25 16 53 -24 15 8 -26 16 24 -23 16 5 - 93 0 0 -25 7 55 6 59 10 29 105 -67 -25 38 46 -24 37 8 -26 38 12 -23 38 11 - 92 0 0 -25 29 33 6 59 19 30 104 -67 -26 0 22 -24 58 49 -26 59 41 -23 59 58 - 91 0 0 -25 50 53 6 59 28 31 104 -66 -26 21 38 -25 20 12 -27 20 52 -24 21 27 - 90 0 0 -26 11 54 6 59 38 32 103 -65 -26 42 35 -25 41 16 -27 41 43 -24 42 37 - 89 0 0 -26 32 35 6 59 47 33 102 -64 -27 3 13 -26 2 0 -28 2 14 -25 3 28 - 88 0 0 -26 52 56 6 59 57 34 102 -63 -27 23 31 -26 22 25 -28 22 25 -25 23 59 - 87 0 0 -27 12 58 7 0 7 35 101 -62 -27 43 29 -26 42 30 -28 42 17 -25 44 10 - 86 0 0 -27 32 38 7 0 17 36 101 -62 -28 3 6 -27 2 14 -29 1 47 -26 4 0 - 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71 0 0 -31 44 9 7 3 13 50 90 -49 -32 13 45 -31 14 37 -33 10 43 -30 18 3 - 70 0 0 -31 57 52 7 3 26 51 90 -48 -32 27 25 -31 28 23 -33 24 17 -30 31 56 - 69 0 0 -32 11 12 7 3 39 51 89 -47 -32 40 41 -31 41 46 -33 37 27 -30 45 25 - 68 0 0 -32 24 8 7 3 52 52 88 -46 -32 53 34 -31 54 46 -33 50 13 -30 58 30 - 67 0 0 -32 36 41 7 4 5 53 87 -45 -33 6 3 -32 7 21 -34 2 36 -31 11 12 - 66 0 0 -32 48 49 7 4 18 54 86 -44 -33 18 9 -32 19 33 -34 14 36 -31 23 29 - 65 0 0 -33 0 34 7 4 32 55 85 -43 -33 29 51 -32 31 21 -34 26 12 -31 35 23 - 64 0 0 -33 11 55 7 4 45 56 84 -42 -33 41 9 -32 42 45 -34 37 24 -31 46 53 - 63 0 0 -33 22 53 7 4 59 57 83 -42 -33 52 3 -32 53 45 -34 48 13 -31 57 58 - 62 0 0 -33 33 26 7 5 12 57 82 -41 -34 2 33 -33 4 21 -34 58 38 -32 8 40 - 61 0 0 -33 43 35 7 5 26 58 81 -40 -34 12 40 -33 14 33 -35 8 39 -32 18 57 - 60 0 0 -33 53 20 7 5 40 59 80 -39 -34 22 23 -33 24 21 -35 18 16 -32 28 50 - 59 0 0 -34 2 42 7 5 54 60 79 -38 -34 31 41 -33 33 45 -35 27 30 -32 38 19 - 58 0 0 -34 11 39 7 6 8 61 78 -37 -34 40 36 -33 42 45 -35 36 20 -32 47 24 - 57 0 0 -34 20 13 7 6 22 62 76 -36 -34 49 7 -33 51 21 -35 44 46 -32 56 4 - 56 0 0 -34 28 22 7 6 36 62 75 -35 -34 57 14 -33 59 33 -35 52 49 -33 4 20 - 55 0 0 -34 36 7 7 6 51 63 74 -35 -35 4 57 -34 7 20 -36 0 28 -33 12 12 - 54 0 0 -34 43 29 7 7 5 64 73 -34 -35 12 17 -34 14 44 -36 7 43 -33 19 39 - 53 0 0 -34 50 26 7 7 19 65 71 -33 -35 19 12 -34 21 43 -36 14 34 -33 26 42 - 52 0 0 -34 56 59 7 7 34 66 70 -32 -35 25 43 -34 28 18 -36 21 2 -33 33 21 - 51 0 0 -35 3 8 7 7 48 66 68 -31 -35 31 51 -34 34 29 -36 27 6 -33 39 36 - 50 0 0 -35 8 54 7 8 3 67 67 -30 -35 37 34 -34 40 16 -36 32 46 -33 45 26 - 49 0 0 -35 14 15 7 8 18 68 65 -29 -35 42 54 -34 45 39 -36 38 2 -33 50 52 - 48 0 0 -35 19 12 7 8 32 69 63 -29 -35 47 49 -34 50 37 -36 42 55 -33 55 53 - 47 0 0 -35 23 45 7 8 47 69 61 -28 -35 52 21 -34 55 12 -36 47 24 -34 0 30 - 46 0 0 -35 27 54 7 9 2 70 59 -27 -35 56 29 -34 59 22 -36 51 30 -34 4 43 - 45 0 0 -35 31 39 7 9 17 71 57 -26 -36 0 13 -35 3 9 -36 55 12 -34 8 31 - 44 0 0 -35 35 0 7 9 31 71 55 -25 -36 3 33 -35 6 31 -36 58 30 -34 11 56 - 43 0 0 -35 37 58 7 9 46 72 53 -24 -36 6 29 -35 9 29 -37 1 24 -34 14 55 - 42 0 0 -35 40 31 7 10 1 73 50 -23 -36 9 2 -35 12 3 -37 3 55 -34 17 31 - 41 0 0 -35 42 40 7 10 16 73 48 -23 -36 11 10 -35 14 12 -37 6 2 -34 19 42 - 40 0 0 -35 44 25 7 10 31 74 45 -22 -36 12 55 -35 15 58 -37 7 46 -34 21 29 - 39 0 0 -35 45 46 7 10 47 75 42 -21 -36 14 15 -35 17 20 -37 9 5 -34 22 51 - 38 0 0 -35 46 43 7 11 2 75 39 -20 -36 15 12 -35 18 17 -37 10 2 -34 23 49 - 37 0 0 -35 47 16 7 11 17 76 36 -19 -36 15 45 -35 18 50 -37 10 34 -34 24 23 - 36 0 0 -35 47 25 7 11 32 76 32 -18 -36 15 54 -35 19 0 -37 10 43 -34 24 32 - 35 0 0 -35 47 10 7 11 47 76 28 -17 -36 15 39 -35 18 44 -37 10 28 -34 24 17 - 34 0 0 -35 46 31 7 12 2 77 25 -17 -36 15 0 -35 18 5 -37 9 50 -34 23 37 - 33 0 0 -35 45 28 7 12 18 77 20 -16 -36 13 57 -35 17 2 -37 8 47 -34 22 33 - 32 0 0 -35 44 1 7 12 33 77 16 -15 -36 12 31 -35 15 34 -37 7 22 -34 21 5 - 31 0 0 -35 42 10 7 12 48 78 12 -14 -36 10 40 -35 13 43 -37 5 32 -34 19 12 - 30 0 0 -35 39 55 7 13 4 78 7 -13 -36 8 25 -35 11 27 -37 3 19 -34 16 55 - 29 0 0 -35 37 15 7 13 19 78 2 -12 -36 5 47 -35 8 46 -37 0 41 -34 14 13 - 28 0 0 -35 34 12 7 13 35 78 357 -11 -36 2 44 -35 5 42 -36 57 40 -34 11 7 - 27 0 0 -35 30 44 7 13 50 78 352 -11 -35 59 17 -35 2 13 -36 54 16 -34 7 36 - 26 0 0 -35 26 52 7 14 5 78 348 -10 -35 55 27 -34 58 20 -36 50 27 -34 3 41 - 25 0 0 -35 22 36 7 14 21 78 343 -9 -35 51 12 -34 54 3 -36 46 15 -33 59 21 - 24 0 0 -35 17 56 7 14 36 78 338 -8 -35 46 33 -34 49 21 -36 41 39 -33 54 37 - 23 0 0 -35 12 51 7 14 52 77 334 -7 -35 41 30 -34 44 15 -36 36 38 -33 49 28 - 22 0 0 -35 7 22 7 15 7 77 330 -6 -35 36 3 -34 38 45 -36 31 14 -33 43 55 - 21 0 0 -35 1 29 7 15 23 77 326 -5 -35 30 11 -34 32 50 -36 25 26 -33 37 57 - 20 0 0 -34 55 12 7 15 38 76 322 -4 -35 23 56 -34 26 31 -36 19 14 -33 31 34 - 19 0 0 -34 48 30 7 15 54 76 318 -4 -35 17 16 -34 19 47 -36 12 38 -33 24 47 - 18 0 0 -34 41 24 7 16 10 75 315 -3 -35 10 12 -34 12 39 -36 5 38 -33 17 35 - 17 0 0 -34 33 53 7 16 25 75 311 -2 -35 2 43 -34 5 6 -35 58 14 -33 9 58 - 16 0 0 -34 25 59 7 16 41 74 308 -1 -34 54 51 -33 57 9 -35 50 26 -33 1 56 - 15 0 0 -34 17 39 7 16 56 73 306 0 -34 46 34 -33 48 48 -35 42 13 -32 53 30 Uncertainty in time = +/- 18 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6842-01515-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 01 39.4051 DE: -23 45 13.218 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .026 ) * V mag [mag]: 10.1 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (748) Simeisa approx. diameter [km]: 103 approx. diameter ["]: .033 distance from Earth [AU]: 4.35200 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 932 number of rejected observations: 89 time covered by the observations: 1920 Feb 19 - 2008 Feb 11 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.018, 87° remarks: * orbital elements for (748) Simeisa : Mean anomaly = 168.20073155 deg Arg. of pericenter = 180.75133195 deg Long. of node = 265.76314360 deg Inclination = 2.25761570 deg Eccentricity = 0.18782036 Semimajor axis = 3.93752490 AU Perihelion dist = 3.19797755 AU Mag: H = 8.87, G = 0.15 Epoch of elements : MJD 54923.30100000 TDT (2009 Apr 02.301) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 2 748 Simeisa 7h 13.6m UT 10.1 18 1 39.405-23 45 13.22TYC 6842-01515-1 10.6 16.3 103 16.4 4.352 0.519 0.41 -28.7667 -23.754 72.49 5.01 7.2274 0.01254 -0.20121 3.53280 0.20103 -0.00583 -0.00001 2000 167.7843282009 330.00000180.751332265.763144 2.2576160.18782036 3.9375249 3.1979776 9.0 5.00.15 RATE 1.2614480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.032 89 1.96 0.031 0 54581.5020090402_1515-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org