IOTA/IOTA-ES occultation update for (410) Chloris / 2UCAC 40006520 event on 2012 Dec 16, 03:39 UT Visible from Africa, USA Summary ------- On 2012 Dec 16 UT, the 107 km diameter asteroid (410) Chloris will occult a 12.2 mag star in the constellation Gemini for observers along a path across Africa, USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 13.3 mag (the magnitude of the asteroid) for at most 7.3 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: 96 * date and approx. time of event: 2012 Dec 16, 03:32 - 2012 Dec 16, 03:45 UT * geocentric midpoint of event [JD]: 2456277.652 * magnitude of target star: 12.2 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 7.3 * Moon: 12 % sunlit, 161° distance * Sun: 158° distance * rough path description: Africa, USA The occultation path -------------------- * approximate projected width [km]: 110 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .022", 90° ) * approx speed of asteroid's shadow [km/s]: 14.5478 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 40006520 by 410 Chloris on 2012 Dec 16 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 -137 0 0 28 47 33 3 45 59 0 64 -20 29 20 46 28 14 25 29 48 3 27 47 18 -136 0 0 29 13 44 3 45 59 1 64 -21 29 46 52 28 40 41 30 14 5 28 13 38 -135 0 0 29 39 29 3 45 58 2 65 -22 30 12 33 29 6 31 30 39 43 28 39 32 -134 0 0 30 4 50 3 45 58 3 65 -23 30 37 48 29 31 56 31 4 54 29 5 1 -133 0 0 30 29 44 3 45 58 4 66 -24 31 2 38 29 56 55 31 29 40 29 30 4 -132 0 0 30 54 13 3 45 57 5 66 -24 31 27 2 30 21 29 31 54 0 29 54 42 -131 0 0 31 18 16 3 45 56 6 67 -25 31 51 0 30 45 37 32 17 54 30 18 53 -130 0 0 31 41 53 3 45 55 7 67 -26 32 14 32 31 9 18 32 41 22 30 42 39 -129 0 0 32 5 4 3 45 54 8 68 -27 32 37 38 31 32 34 33 4 24 31 5 58 -128 0 0 32 27 48 3 45 53 9 68 -28 33 0 17 31 55 23 33 26 59 31 28 52 -127 0 0 32 50 6 3 45 52 10 69 -29 33 22 30 32 17 46 33 49 8 31 51 18 -126 0 0 33 11 57 3 45 51 11 69 -30 33 44 17 32 39 42 34 10 51 32 13 19 -125 0 0 33 33 22 3 45 49 12 70 -31 34 5 37 33 1 12 34 32 7 32 34 53 -124 0 0 33 54 21 3 45 48 13 70 -32 34 26 31 33 22 16 34 52 56 32 56 0 -123 0 0 34 14 53 3 45 46 14 71 -32 34 46 58 33 42 52 35 13 19 33 16 41 -122 0 0 34 34 58 3 45 45 14 72 -33 35 6 58 34 3 2 35 33 16 33 36 55 -121 0 0 34 54 37 3 45 43 15 72 -34 35 26 32 34 22 46 35 52 46 33 56 42 -120 0 0 35 13 49 3 45 41 16 73 -35 35 45 40 34 42 3 36 11 49 34 16 3 -119 0 0 35 32 35 3 45 39 17 73 -36 36 4 21 35 0 54 36 30 27 34 34 58 -118 0 0 35 50 55 3 45 37 18 74 -37 36 22 35 35 19 18 36 48 37 34 53 26 -117 0 0 36 8 48 3 45 35 19 74 -38 36 40 24 35 37 16 37 6 22 35 11 27 -116 0 0 36 26 15 3 45 33 20 75 -38 36 57 46 35 54 47 37 23 40 35 29 2 -115 0 0 36 43 15 3 45 30 20 76 -39 37 14 42 36 11 52 37 40 33 35 46 11 -114 0 0 36 59 50 3 45 28 21 76 -40 37 31 12 36 28 31 37 56 59 36 2 54 -113 0 0 37 15 58 3 45 26 22 77 -41 37 47 16 36 44 44 38 12 59 36 19 10 -112 0 0 37 31 41 3 45 23 23 78 -41 38 2 54 37 0 31 38 28 34 36 35 1 -111 0 0 37 46 57 3 45 20 24 78 -42 38 18 7 37 15 52 38 43 43 36 50 25 -110 0 0 38 1 48 3 45 18 25 79 -43 38 32 54 37 30 47 38 58 26 37 5 24 -109 0 0 38 16 14 3 45 15 25 79 -44 38 47 15 37 45 17 39 12 44 37 19 56 -108 0 0 38 30 14 3 45 12 26 80 -45 39 1 11 37 59 20 39 26 37 37 34 4 -107 0 0 38 43 48 3 45 10 27 81 -45 39 14 41 38 12 59 39 40 4 37 47 45 -106 0 0 38 56 57 3 45 7 28 81 -46 39 27 47 38 26 12 39 53 6 38 1 1 -105 0 0 39 9 41 3 45 4 29 82 -47 39 40 27 38 39 0 40 5 43 38 13 52 -104 0 0 39 22 0 3 45 1 29 83 -48 39 52 42 38 51 22 40 17 55 38 26 18 -103 0 0 39 33 55 3 44 58 30 84 -48 40 4 33 39 3 20 40 29 43 38 38 19 -102 0 0 39 45 24 3 44 54 31 84 -49 40 15 59 39 14 53 40 41 6 38 49 54 -101 0 0 39 56 29 3 44 51 32 85 -50 40 27 0 39 26 1 40 52 5 39 1 5 -100 0 0 40 7 9 3 44 48 32 86 -50 40 37 37 39 36 44 41 2 39 39 11 51 - 99 0 0 40 17 25 3 44 45 33 86 -51 40 47 49 39 47 3 41 12 49 39 22 13 - 98 0 0 40 27 16 3 44 41 34 87 -52 40 57 38 39 56 58 41 22 35 39 32 10 - 97 0 0 40 36 43 3 44 38 35 88 -52 41 7 2 40 6 28 41 31 57 39 41 42 - 96 0 0 40 45 47 3 44 34 35 88 -53 41 16 3 40 15 34 41 40 55 39 50 51 - 95 0 0 40 54 26 3 44 31 36 89 -54 41 24 39 40 24 16 41 49 29 39 59 35 - 94 0 0 41 2 41 3 44 27 37 90 -54 41 32 52 40 32 34 41 57 40 40 7 55 - 93 0 0 41 10 33 3 44 24 38 91 -55 41 40 41 40 40 28 42 5 27 40 15 51 - 92 0 0 41 18 1 3 44 20 38 91 -56 41 48 7 40 47 59 42 12 51 40 23 24 - 91 0 0 41 25 6 3 44 16 39 92 -56 41 55 9 40 55 6 42 19 51 40 30 32 - 90 0 0 41 31 47 3 44 13 40 93 -57 42 1 48 41 1 49 42 26 28 40 37 18 - 89 0 0 41 38 5 3 44 9 41 94 -58 42 8 4 41 8 9 42 32 43 40 43 39 - 88 0 0 41 43 59 3 44 5 41 95 -58 42 13 57 41 14 6 42 38 34 40 49 37 - 87 0 0 41 49 31 3 44 1 42 95 -59 42 19 27 41 19 39 42 44 2 40 55 12 - 86 0 0 41 54 39 3 43 57 43 96 -60 42 24 33 41 24 49 42 49 7 41 0 23 - 85 0 0 41 59 25 3 43 53 43 97 -60 42 29 17 41 29 36 42 53 50 41 5 12 - 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2012 Nov 23 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.010, 87° remarks: * orbital elements for (410) Chloris : Mean anomaly = 195.96031927 deg Arg. of pericenter = 172.81339292 deg Long. of node = 96.94909717 deg Inclination = 10.96001016 deg Eccentricity = 0.24000262 Semimajor axis = 2.72672031 AU Perihelion dist = 2.07230028 AU Mag: H = 8.17, G = 0.15 Epoch of elements : MJD 56277.15200000 TDT (2012 Dec 16.152) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 16 410 Chloris 3h 38.9m UT 12.2 7 9 47.767 23 14 41.462UCAC 40006520 0.0 13.3 107 7.3 2.430 -2.051 9.21 -32.4605 23.243 124.20 -23.33 3.6480 0.06935 0.21646 -7.80707 2.54418 -0.00221 0.00019 2000 194.394755201212 9.00000172.813393 96.949097 10.9600100.24000262 2.7267203 2.0723003 8.3 5.00.15 RATE 2.1889880 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.022 90 1.41 0.025 0 0-5-1 056264.0020121216_006520 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org