IOTA/IOTA-ES occultation update for (282) Clorinde / TYC 6319-02035-1 event on 2012 Sep 08, 19:59 UT Visible from India, Madagascar Summary ------- On 2012 Sep 08 UT, the 38 km diameter asteroid (282) Clorinde will occult a 9.5 mag star in the constellation Capricornus for observers along a path across India, Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 14.8 mag (the magnitude of the asteroid) for at most 7.8 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: 63 * date and approx. time of event: 2012 Sep 08, 19:39 - 2012 Sep 08, 20:17 UT * geocentric midpoint of event [JD]: 2456179.3328625 * magnitude of target star: 9.5 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 7.8 * Moon: 48 % sunlit, 137° distance * Sun: 136° distance * rough path description: India, Madagascar Additional comments ------------------- close double star The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 0.96 * 1 sigma uncertainty interval [seconds]: +/- 7.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .028", 88° ) * approx speed of asteroid's shadow [km/s]: 4.8292 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6319-02035-1 by 282 Clorinde on 2012 Sep 8 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 ' " Longitude Longitude Longitude Longitude 100 39 9 28 0 0 19 39 39 0 249 -42 100 3 45 ... .. .. 98 58 4 ... .. .. 97 53 31 27 0 0 19 39 41 3 248 -44 97 21 56 98 25 43 96 22 56 99 29 29 Latitude Latitude Latitude Latitude 96 0 0 26 14 11 19 39 44 5 247 -46 26 26 39 26 1 42 26 50 31 25 37 39 95 0 0 25 48 22 19 39 46 6 247 -47 26 0 56 25 35 48 26 24 58 25 11 36 94 0 0 25 21 27 19 39 49 7 246 -48 25 34 5 25 8 47 25 58 18 24 44 24 93 0 0 24 53 23 19 39 52 8 246 -49 25 6 7 24 40 37 25 30 30 24 16 3 92 0 0 24 24 9 19 39 56 9 245 -50 24 36 59 24 11 17 25 1 33 23 46 33 91 0 0 23 53 44 19 40 0 10 245 -51 24 6 40 23 40 47 24 31 26 23 15 50 90 0 0 23 22 7 19 40 5 11 245 -52 23 35 10 23 9 4 24 0 7 22 43 55 89 0 0 22 49 18 19 40 10 12 244 -53 23 2 26 22 36 7 23 27 36 22 10 46 88 0 0 22 15 13 19 40 16 13 244 -54 22 28 28 22 1 56 22 53 51 21 36 21 87 0 0 21 39 53 19 40 22 14 244 -55 21 53 15 21 26 29 22 18 51 21 0 40 86 0 0 21 3 15 19 40 29 15 243 -56 21 16 45 20 49 44 21 42 35 20 23 41 85 0 0 20 25 19 19 40 37 16 243 -57 20 38 56 20 11 40 21 5 0 19 45 23 84 0 0 19 46 3 19 40 45 17 243 -58 19 59 48 19 32 16 20 26 7 19 5 44 83 0 0 19 5 26 19 40 54 18 242 -59 19 19 19 18 51 31 19 45 53 18 24 43 82 0 0 18 23 26 19 41 3 19 242 -61 18 37 27 18 9 23 19 4 17 17 42 19 81 0 0 17 40 2 19 41 13 21 242 -62 17 54 12 17 25 51 18 21 18 16 58 30 80 0 0 16 55 13 19 41 24 22 242 -63 17 9 32 16 40 53 17 36 55 16 13 15 79 0 0 16 8 57 19 41 36 23 242 -64 16 23 25 15 54 28 16 51 6 15 26 32 78 0 0 15 21 14 19 41 48 24 242 -65 15 35 51 15 6 34 16 3 49 14 38 21 77 0 0 14 32 0 19 42 1 25 241 -66 14 46 47 14 17 12 15 15 4 13 48 39 76 0 0 13 41 17 19 42 15 26 241 -68 13 56 14 13 26 18 14 24 49 12 57 26 75 0 0 12 49 1 19 42 30 28 241 -69 13 4 8 12 33 52 13 33 4 12 4 40 74 0 0 11 55 13 19 42 45 29 241 -70 12 10 31 11 39 53 12 39 46 11 10 20 73 0 0 10 59 50 19 43 2 30 241 -71 11 15 19 10 44 20 11 44 55 10 14 25 72 0 0 10 2 53 19 43 19 31 241 -73 10 18 33 9 47 11 10 48 30 9 16 54 71 0 0 9 4 19 19 43 37 33 241 -74 9 20 10 8 48 25 9 50 29 8 17 46 70 0 0 8 4 8 19 43 56 34 242 -75 8 20 11 7 48 2 8 50 53 7 17 0 69 0 0 7 2 20 19 44 16 35 242 -76 7 18 35 6 46 1 7 49 40 6 14 35 68 0 0 5 58 53 19 44 37 37 242 -78 6 15 21 5 42 22 6 46 49 5 10 30 67 0 0 4 53 46 19 44 59 38 242 -79 5 10 27 4 37 2 5 42 20 4 4 46 66 0 0 3 47 1 19 45 22 39 243 -80 4 3 55 3 30 3 4 36 13 2 57 20 65 0 0 2 38 35 19 45 46 40 243 -82 2 55 43 2 21 24 3 28 27 1 48 14 64 0 0 1 28 29 19 46 10 42 244 -83 1 45 52 1 11 4 2 19 2 0 37 26 63 0 0 0 16 44 19 46 36 43 244 -84 0 34 20 - 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85 0 0 -84 23 53 20 17 47 17 98 -1 -84 11 57 -84 35 50 -83 49 7 -84 58 50 - 86 0 0 -84 22 1 20 17 48 17 99 -1 -84 10 2 -84 34 2 -83 47 5 -84 57 9 - 87 0 0 -84 20 2 20 17 49 17 100 -1 -84 7 59 -84 32 7 -83 44 54 -84 55 22 - 88 0 0 -84 17 56 20 17 50 17 101 -1 -84 5 48 -84 30 4 -83 42 36 -84 53 28 - 89 0 0 -84 15 42 20 17 51 17 102 -1 -84 3 30 -84 27 55 -83 40 9 -84 51 27 - 90 0 0 -84 13 21 20 17 52 17 103 -1 -84 1 4 -84 25 38 -83 37 35 -84 49 19 - 91 0 0 -84 10 51 20 17 52 17 104 0 -83 58 30 -84 23 14 -83 34 51 -84 47 4 - 92 0 0 -84 8 14 20 17 53 17 105 0 -83 55 48 -84 20 42 -83 31 59 -84 44 42 - 93 0 0 -84 5 28 20 17 54 17 106 0 -83 52 56 -84 18 1 -83 28 58 -84 42 12 - 94 0 0 -84 2 34 20 17 55 17 107 0 -83 49 56 -84 15 13 -83 25 47 -84 39 35 - 95 0 0 -83 59 30 20 17 56 16 108 0 -83 46 47 -84 12 15 -83 22 26 -84 36 49 Uncertainty in time = +/- 8 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 6319-02035-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 15 25.0209 DE: -18 16 54.155 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .024 ) * V mag [mag]: 9.5 * B mag [mag]: 10.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (282) Clorinde approx. diameter [km]: 38 approx. diameter ["]: .033 distance from Earth [AU]: 1.60600 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1063 number of rejected observations: 83 time covered by the observations: 1904 May 18 - 2012 Aug 06 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.015, 86° remarks: * orbital elements for (282) Clorinde : Mean anomaly = 245.23466113 deg Arg. of pericenter = 296.53492755 deg Long. of node = 144.99595787 deg Inclination = 9.02937427 deg Eccentricity = 0.08058739 Semimajor axis = 2.33898235 AU Perihelion dist = 2.15048987 AU Mag: H = 10.89, G = 0.15 Epoch of elements : MJD 56178.83300000 TDT (2012 Sep 08.833) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 8 282 Clorinde 19h 59.3m UT 9.5 20 15 25.021-18 16 54.15TYC 6319-02035-1 10.0 14.8 38 7.8 1.606 -0.583 -12.38 15.7412 -18.279 -120.48 5.30 19.9887 0.37056 -0.24923 -1.52121 -2.26176 0.00377 0.00075 2000 242.8009342012 831.00000296.534928144.995958 9.0293740.08058739 2.3389824 2.150489910.9 5.00.15 RATE 2.7552670 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.028 88 1.96 0.031 0 0-1-5 056165.0020120908_2035-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org