IOTA/IOTA-ES occultation update for (957) Camelia / UCAC2 24605105 event on 2009 May 10, 14:15 UT Visible from Summary ------- On 2009 May 10 UT, the 74 km diameter asteroid (957) Camelia will occult a 12.0 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.9 mag (the magnitude of the asteroid) for at most 5.2 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: 24 * date and approx. time of event: 2009 May 10, 14:08 - 2009 May 10, 14:23 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 5.2 * Moon: 98 % sunlit, 21° distance * Sun: 175° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 75 * 1 sigma uncertainty interval [path widths]: +/- 2.79 * 1 sigma uncertainty interval [seconds]: +/- 14.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .142 +/- .138) * 1 sigma uncertainty ellipse (major, minor, PA): ( .142", .138", 90° ) * approx speed of asteroid's shadow [km/s]: 14.0558 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 24605105 by 957 Camelia on 2009 May 10 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 61 59 23 24 0 0 14 23 21 4 113 -1 62 54 20 61 3 20 67 44 2 ... .. .. Latitude Latitude Latitude Latitude 62 0 0 23 59 45 14 23 21 4 113 -1 24 21 44 23 37 45 26 24 4 21 34 35 63 0 0 23 35 38 14 23 20 5 113 -2 23 57 42 23 13 33 26 0 32 21 9 53 64 0 0 23 10 50 14 23 19 6 114 -3 23 33 0 22 48 39 25 36 19 20 44 29 65 0 0 22 45 22 14 23 18 7 114 -4 23 7 37 22 23 5 25 11 27 20 18 25 66 0 0 22 19 12 14 23 17 8 114 -5 22 41 33 21 56 51 24 45 54 19 51 39 67 0 0 21 52 23 14 23 16 9 115 -6 22 14 49 21 29 55 24 19 40 19 24 12 68 0 0 21 24 52 14 23 14 11 115 -7 21 47 24 21 2 19 23 52 47 18 56 3 69 0 0 20 56 40 14 23 13 12 115 -8 21 19 18 20 34 1 23 25 13 18 27 14 70 0 0 20 27 48 14 23 11 13 116 -9 20 50 31 20 5 3 22 56 58 17 57 43 71 0 0 19 58 14 14 23 9 14 116 -10 20 21 3 19 35 24 22 28 3 17 27 30 72 0 0 19 28 0 14 23 7 15 116 -11 19 50 55 19 5 4 21 58 27 16 56 37 73 0 0 18 57 5 14 23 5 16 117 -12 19 20 6 18 34 3 21 28 11 16 25 3 74 0 0 18 25 30 14 23 2 17 117 -13 18 48 37 18 2 22 20 57 15 15 52 48 75 0 0 17 53 14 14 23 0 18 117 -14 18 16 27 17 30 0 20 25 38 15 19 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-43 16 3 -43 58 24 -41 18 13 -45 56 58 -123 0 0 -43 22 54 14 8 29 9 253 -12 -43 1 39 -43 44 9 -41 3 26 -45 43 7 -122 0 0 -43 8 1 14 8 28 8 252 -11 -42 46 43 -43 29 21 -40 48 4 -45 28 43 -121 0 0 -42 52 35 14 8 28 8 251 -10 -42 31 12 -43 13 59 -40 32 9 -45 13 47 -120 0 0 -42 36 35 14 8 27 7 251 -10 -42 15 8 -42 58 4 -40 15 38 -44 58 18 -119 0 0 -42 20 1 14 8 26 6 250 -9 -41 58 28 -42 41 35 -39 58 33 -44 42 16 -118 0 0 -42 2 52 14 8 25 5 249 -8 -41 41 15 -42 24 31 -39 40 52 -44 25 39 -117 0 0 -41 45 8 14 8 25 4 249 -7 -41 23 25 -42 6 51 -39 22 34 -44 8 29 -116 0 0 -41 26 48 14 8 24 4 248 -7 -41 5 0 -41 48 37 -39 3 40 -43 50 43 -115 0 0 -41 7 52 14 8 24 3 247 -6 -40 45 59 -41 29 46 -38 44 10 -43 32 22 -114 0 0 -40 48 19 14 8 24 2 247 -5 -40 26 21 -41 10 19 -38 24 2 -43 13 26 -113 0 0 -40 28 10 14 8 24 1 246 -4 -40 6 6 -40 50 15 -38 3 16 -42 53 53 -112 0 0 -40 7 23 14 8 24 0 245 -3 -39 45 13 -40 29 34 .. .. .. -42 33 44 Uncertainty in time = +/- 15 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 24605105 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 49 21.3886 DE: -18 44 22.168 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .138, .137 ) * V mag [mag]: 12.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (957) Camelia approx. diameter [km]: 74 approx. diameter ["]: .050 distance from Earth [AU]: 2.05600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 783 number of rejected observations: 58 time covered by the observations: 1926 Oct 04 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.017, 92° remarks: * orbital elements for (957) Camelia : Mean anomaly = 121.89433419 deg Arg. of pericenter = 224.06193793 deg Long. of node = 232.97072929 deg Inclination = 14.78078842 deg Eccentricity = 0.08548675 Semimajor axis = 2.91723154 AU Perihelion dist = 2.66784690 AU Mag: H = 9.81, G = 0.15 Epoch of elements : MJD 54961.59400000 TDT (2009 May 10.594) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 10 957 Camelia 14h 15.9m UT 12.0 14 49 21.389-18 44 22.17UCAC2 24605105 0.0 13.9 74 5.2 2.056 -1.961 19.37 139.8559 -18.745 -34.87 17.76 14.2646 -0.07686 -0.11041 -6.51353 4.52930 0.00048 0.00010 2000 121.5790252009 5 9.00000224.061938232.970729 14.7807880.08548675 2.9172315 2.6678469 9.7 5.00.15 RATE 1.9780980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.142 0.138 90 3.79 0.138 0 54545.5020090510_605105 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org