IOTA/IOTA-ES occultation update for (993) Moultona / TYC 1338-00241-1 event on 2009 Dec 02, 04:55 UT Visible from Summary ------- On 2009 Dec 02 UT, the 15 km diameter asteroid (993) Moultona will occult a 10.5 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 16.0 mag (the magnitude of the asteroid) for at most 1.8 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: 19 * date and approx. time of event: 2009 Dec 02, 04:44 - 2009 Dec 02, 05:06 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.8 * Moon: 100 % sunlit, 33° distance * Sun: 150° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 3.58 * 1 sigma uncertainty interval [seconds]: +/- 10.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .070 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .070", .039", 94° ) * approx speed of asteroid's shadow [km/s]: 8.1588 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1338-00241-1 by 993 Moultona on 2009 Dec 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 -147 0 0 28 23 25 5 6 13 1 67 -29 28 28 28 28 18 23 29 4 44 .. .. .. -146 0 0 28 46 16 5 6 13 2 68 -30 28 51 19 28 41 14 29 27 36 .. .. .. -145 0 0 29 9 5 5 6 12 3 68 -31 29 14 8 29 4 2 29 50 25 .. .. .. -144 0 0 29 31 51 5 6 11 4 69 -32 29 36 54 29 26 48 30 13 12 .. .. .. -143 0 0 29 54 34 5 6 10 5 69 -33 29 59 37 29 49 31 30 35 55 29 13 30 -142 0 0 30 17 13 5 6 9 6 70 -34 30 22 16 30 12 10 30 58 35 29 36 9 -141 0 0 30 39 47 5 6 8 6 70 -35 30 44 50 30 34 44 31 21 9 29 58 43 -140 0 0 31 2 17 5 6 6 7 71 -35 31 7 20 30 57 14 31 43 39 30 21 13 -139 0 0 31 24 42 5 6 4 8 71 -36 31 29 45 31 19 39 32 6 4 30 43 37 -138 0 0 31 47 0 5 6 1 9 72 -37 31 52 3 31 41 57 32 28 22 31 5 56 -137 0 0 32 9 13 5 5 59 10 72 -38 32 14 16 32 4 10 32 50 34 31 28 9 -136 0 0 32 31 18 5 5 56 11 73 -39 32 36 21 32 26 15 33 12 40 31 50 15 -135 0 0 32 53 16 5 5 54 12 73 -40 32 58 20 32 48 14 33 34 37 32 12 13 -134 0 0 33 15 7 5 5 50 13 74 -41 33 20 10 33 10 4 33 56 28 32 34 5 -133 0 0 33 36 50 5 5 47 14 74 -41 33 41 52 33 31 47 34 18 9 32 55 48 -132 0 0 33 58 24 5 5 44 15 75 -42 34 3 26 33 53 21 34 39 42 33 17 23 -131 0 0 34 19 49 5 5 40 16 76 -43 34 24 51 34 14 46 35 1 7 33 38 49 -130 0 0 34 41 4 5 5 36 16 76 -44 34 46 7 34 36 2 35 22 21 34 0 5 -129 0 0 35 2 10 5 5 32 17 77 -45 35 7 13 34 57 8 35 43 26 34 21 12 -128 0 0 35 23 6 5 5 28 18 77 -45 35 28 8 35 18 4 36 4 21 34 42 10 -127 0 0 35 43 51 5 5 24 19 78 -46 35 48 54 35 38 50 36 25 4 35 2 56 -126 0 0 36 4 26 5 5 19 20 79 -47 36 9 28 35 59 24 36 45 38 35 23 32 -125 0 0 36 24 49 5 5 14 21 79 -48 36 29 51 36 19 48 37 5 59 35 43 57 -124 0 0 36 45 1 5 5 9 22 80 -48 36 50 3 36 40 0 37 26 10 36 4 11 -123 0 0 37 5 2 5 5 4 22 81 -49 37 10 3 37 0 1 37 46 8 36 24 13 -122 0 0 37 24 50 5 4 59 23 81 -50 37 29 51 37 19 49 38 5 54 36 44 3 -121 0 0 37 44 25 5 4 54 24 82 -51 37 49 26 37 39 25 38 25 28 37 3 41 -120 0 0 38 3 49 5 4 49 25 83 -51 38 8 49 37 58 48 38 44 49 37 23 6 -119 0 0 38 22 59 5 4 43 26 83 -52 38 27 59 38 17 59 39 3 57 37 42 18 -118 0 0 38 41 56 5 4 37 26 84 -53 38 46 56 38 36 56 39 22 52 38 1 18 -117 0 0 39 0 40 5 4 31 27 85 -53 39 5 40 38 55 40 39 41 34 38 20 4 -116 0 0 39 19 10 5 4 26 28 86 -54 39 24 10 39 14 11 40 0 1 38 38 36 -115 0 0 39 37 26 5 4 19 29 86 -54 39 42 26 39 32 28 40 18 15 38 56 55 -114 0 0 39 55 29 5 4 13 29 87 -55 40 0 28 39 50 30 40 36 15 39 15 0 -113 0 0 40 13 17 5 4 7 30 88 -56 40 18 16 40 8 19 40 54 1 39 32 51 -112 0 0 40 30 51 5 4 1 31 89 -56 40 35 49 40 25 53 41 11 32 39 50 27 -111 0 0 40 48 10 5 3 54 32 89 -57 40 53 8 40 43 13 41 28 49 40 7 49 -110 0 0 41 5 15 5 3 47 32 90 -57 41 10 13 41 0 18 41 45 51 40 24 57 -109 0 0 41 22 5 5 3 41 33 91 -58 41 27 2 41 17 8 42 2 38 40 41 49 -108 0 0 41 38 40 5 3 34 34 92 -58 41 43 37 41 33 43 42 19 10 40 58 27 -107 0 0 41 55 0 5 3 27 35 93 -59 41 59 56 41 50 3 42 35 27 41 14 50 -106 0 0 42 11 4 5 3 20 35 94 -59 42 16 0 42 6 8 42 51 28 41 30 57 -105 0 0 42 26 54 5 3 13 36 95 -60 42 31 49 42 21 58 43 7 15 41 46 50 -104 0 0 42 42 28 5 3 6 37 95 -60 42 47 23 42 37 32 43 22 46 42 2 26 -103 0 0 42 57 46 5 2 59 37 96 -61 43 2 41 42 52 51 43 38 1 42 17 48 -102 0 0 43 12 49 5 2 52 38 97 -61 43 17 44 43 7 54 43 53 1 42 32 54 -101 0 0 43 27 36 5 2 44 39 98 -61 43 32 30 43 22 42 44 7 45 42 47 44 -100 0 0 43 42 8 5 2 37 39 99 -62 43 47 2 43 37 14 44 22 13 43 2 19 - 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39 0 0 50 11 41 4 54 17 60 189 -49 50 16 21 50 7 1 50 49 53 49 33 42 - 38 0 0 50 10 8 4 54 9 60 190 -49 50 14 49 50 5 28 50 48 21 49 32 9 - 37 0 0 50 8 21 4 54 0 60 192 -48 50 13 1 50 3 41 50 46 35 49 30 21 - 36 0 0 50 6 18 4 53 52 60 194 -48 50 10 58 50 1 38 50 44 33 49 28 18 - 35 0 0 50 4 0 4 53 44 60 196 -47 50 8 41 49 59 20 50 42 15 49 25 59 - 34 0 0 50 1 27 4 53 35 59 198 -47 50 6 8 49 56 47 50 39 43 49 23 25 - 33 0 0 49 58 39 4 53 27 59 199 -46 50 3 20 49 53 58 50 36 56 49 20 36 - 32 0 0 49 55 35 4 53 18 59 201 -46 50 0 16 49 50 55 50 33 54 49 17 31 - 31 0 0 49 52 17 4 53 10 59 203 -45 49 56 58 49 47 36 50 30 37 49 14 12 - 30 0 0 49 48 43 4 53 1 59 205 -45 49 53 24 49 44 2 50 27 4 49 10 36 - 29 0 0 49 44 54 4 52 53 59 206 -44 49 49 35 49 40 13 50 23 16 49 6 46 - 28 0 0 49 40 50 4 52 44 58 208 -43 49 45 31 49 36 8 50 19 13 49 2 40 - 27 0 0 49 36 30 4 52 36 58 210 -43 49 41 12 49 31 48 50 14 55 48 58 19 - 26 0 0 49 31 55 4 52 28 58 211 -42 49 36 37 49 27 13 50 10 22 48 53 43 - 25 0 0 49 27 5 4 52 19 58 213 -42 49 31 47 49 22 23 50 5 33 48 48 51 - 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2007 Jul 20 1 sigma uncertainty ellipse (major, minor, PA): 0.068, 0.035, 94° remarks: * orbital elements for (993) Moultona : Mean anomaly = 14.67573910 deg Arg. of pericenter = 249.45260502 deg Long. of node = 184.37431383 deg Inclination = 1.77450261 deg Eccentricity = 0.04513871 Semimajor axis = 2.86092682 AU Perihelion dist = 2.73178828 AU Mag: H = 11.37, G = 0.15 Epoch of elements : MJD 55167.20500000 TDT (2009 Dec 02.205) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 2 993 Moultona 4h 54.9m UT 10.5 6 44 19.583 20 24 36.78TYC 1338-00241-1 12.6 16.0 15 1.8 1.841 -1.566 0.13 -43.8184 20.411 103.62 -21.97 4.9151 0.00294 0.49401 -4.60498 0.02606 -0.00294 0.00046 2000 13.20824020091125.00000249.452605184.374314 1.7745030.04513871 2.8609268 2.731788311.8 5.00.15 RATE 2.0367790 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.070 0.039 94 4.58 0.040 0 54581.5020091202_0241-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 09:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org