IOTA/IOTA-ES occultation update for (107) Camilla / 2UCAC 28401617 event on 2009 Jul 02, 10:13 UT Visible from Australia Summary ------- On 2009 Jul 02 UT, the 223 km diameter asteroid (107) Camilla will occult a 13.2 mag star in the constellation Ophiuchus for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 12.6 mag (the magnitude of the asteroid) for at most 16.7 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: 82 * date and approx. time of event: 2009 Jul 02, 10:05 - 2009 Jul 02, 10:20 UT * magnitude of target star: 13.2 * magnitude drop [mag]: 0.5 * estimated maximum duration [s]: 16.7 * Moon: 79 % sunlit, 43° distance * Sun: 159° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 230 * 1 sigma uncertainty interval [path widths]: +/- 0.65 * 1 sigma uncertainty interval [seconds]: +/- 10.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .074 +/- .073) * 1 sigma uncertainty ellipse (major, minor, PA): ( .074", .073", 90° ) * approx speed of asteroid's shadow [km/s]: 13.3330 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 28401617 by 107 Camilla on 2009 Jul 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 106 0 0 -22 6 54 10 20 48 10 97 0 -21 3 54 -23 10 12 -19 42 23 -24 32 58 107 0 0 -22 15 49 10 20 46 11 96 -1 -21 12 50 -23 19 6 -19 51 21 -24 41 50 108 0 0 -22 24 35 10 20 45 12 96 -2 -21 21 38 -23 27 50 -20 0 11 -24 50 33 109 0 0 -22 33 13 10 20 43 13 95 -3 -21 30 17 -23 36 26 -20 8 51 -24 59 7 110 0 0 -22 41 41 10 20 41 14 95 -4 -21 38 46 -23 44 53 -20 17 23 -25 7 32 111 0 0 -22 50 0 10 20 39 14 95 -5 -21 47 7 -23 53 11 -20 25 45 -25 15 47 112 0 0 -22 58 10 10 20 37 15 94 -5 -21 55 18 -24 1 19 -20 33 58 -25 23 54 113 0 0 -23 6 10 10 20 35 16 94 -6 -22 3 19 -24 9 18 -20 42 1 -25 31 51 114 0 0 -23 14 1 10 20 33 17 93 -7 -22 11 12 -24 17 7 -20 49 55 -25 39 39 115 0 0 -23 21 42 10 20 30 18 93 -8 -22 18 54 -24 24 47 -20 57 40 -25 47 17 116 0 0 -23 29 14 10 20 28 19 93 -9 -22 26 27 -24 32 18 -21 5 14 -25 54 45 117 0 0 -23 36 36 10 20 25 20 92 -10 -22 33 50 -24 39 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9 44 18 10 5 34 9 261 -25 - 8 40 58 -10 47 56 - 7 19 3 -12 11 8 - 83 0 0 - 9 33 7 10 5 33 8 261 -24 - 8 29 48 -10 36 44 - 7 7 54 -11 59 55 - 82 0 0 - 9 22 2 10 5 32 7 261 -23 - 8 18 44 -10 25 38 - 6 56 51 -11 48 47 - 81 0 0 - 9 11 2 10 5 31 6 261 -22 - 8 7 45 -10 14 36 - 6 45 53 -11 37 45 - 80 0 0 - 9 0 7 10 5 30 5 261 -21 - 7 56 52 -10 3 41 - 6 35 1 -11 26 48 - 79 0 0 - 8 49 19 10 5 30 4 261 -21 - 7 46 4 - 9 52 51 - 6 24 15 -11 15 57 - 78 0 0 - 8 38 36 10 5 29 3 261 -20 - 7 35 23 - 9 42 8 - 6 13 36 -11 5 11 - 77 0 0 - 8 28 0 10 5 29 2 260 -19 - 7 24 48 - 9 31 30 - 6 3 2 -10 54 33 - 76 0 0 - 8 17 31 10 5 29 1 260 -18 - 7 14 20 - 9 21 0 - 5 52 35 -10 44 0 Uncertainty in time = +/- 11 secs Prediction of 2009 Jun 25.0 Data for the target star ------------------------ * name: 2UCAC 28401617 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 39 39.8543 DE: -09 44 27.496 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .073, .073 ) * V mag [mag]: 13.2 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (107) Camilla approx. diameter [km]: 223 approx. diameter ["]: .113 distance from Earth [AU]: 2.72400 * orbital information: orbit source: Preston date of fit: 2009 Jun 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 985 number of rejected observations: 160 time covered by the observations: 1916 Apr 27 - 2009 Jun 23 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.010, 91° remarks: * orbital elements for (107) Camilla : Mean anomaly = 140.99807511 deg Arg. of pericenter = 309.78914957 deg Long. of node = 173.12013081 deg Inclination = 10.04947134 deg Eccentricity = 0.07740524 Semimajor axis = 3.47614817 AU Perihelion dist = 3.20707610 AU Mag: H = 7.08, G = 0.08 Epoch of elements : MJD 55014.42600000 TDT (2009 Jul 02.426) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 2 107 Camilla 10h 13.2m UT 13.2 17 39 39.854- 9 44 27.502UCAC 28401617 0.0 12.6 223 16.7 2.724 -1.633 -2.62 -168.9721 -9.740 27.72 23.01 10.2200 0.02685 -0.24787 -7.48189 -0.80894 0.00152 -0.00134 2000 140.3249932009 628.00000309.789150173.120131 10.0494710.07740524 3.4761482 3.2070761 7.1 5.00.08 RATE 1.5207460 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.074 0.073 90 1.65 0.073 1 9 1235 55007.0020090702_401617 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 24, 17:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org