IOTA/IOTA-ES occultation update for (1015) Christa / UCAC2 25142348 event on 2012 Jul 17, 21:29 UT Visible from S Africa, Brazil Summary ------- On 2012 Jul 17 UT, the 101 km diameter asteroid (1015) Christa will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across S Africa, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.2 mag (the magnitude of the asteroid) for at most 9.1 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: 61 * date and approx. time of event: 2012 Jul 17, 21:19 - 2012 Jul 17, 21:37 UT * geocentric midpoint of event [JD]: 2456126.39525833 * magnitude of target star: 11.3 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 9.1 * Moon: 2 % sunlit, 167° distance * Sun: 152° distance * rough path description: S Africa, Brazil The occultation path -------------------- * approximate projected width [km]: 102 * 1 sigma uncertainty interval [path widths]: +/- 1.01 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .057) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .057", 91° ) * approx speed of asteroid's shadow [km/s]: 11.0875 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 25142348 by 1015 Christa on 2012 Jul 17 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 - 64 0 0 -28 23 7 21 37 51 24 98 -1 -27 55 11 -28 51 4 -26 58 49 -29 47 36 - 63 0 0 -28 32 47 21 37 47 25 98 -1 -28 4 53 -29 0 42 -27 8 35 -29 57 10 - 62 0 0 -28 42 4 21 37 43 26 97 -2 -28 14 12 -29 9 57 -27 17 59 -30 6 21 - 61 0 0 -28 50 59 21 37 39 27 97 -3 -28 23 9 -29 18 50 -27 26 59 -30 15 11 - 60 0 0 -28 59 32 21 37 35 28 96 -4 -28 31 43 -29 27 21 -27 35 37 -30 23 38 - 59 0 0 -29 7 42 21 37 31 29 96 -5 -28 39 55 -29 35 29 -27 43 52 -30 31 43 - 58 0 0 -29 15 29 21 37 26 30 95 -6 -28 47 45 -29 43 16 -27 51 45 -30 39 25 - 57 0 0 -29 22 55 21 37 22 31 95 -7 -28 55 12 -29 50 39 -27 59 15 -30 46 46 - 56 0 0 -29 29 58 21 37 18 31 94 -7 -29 2 16 -29 57 41 -28 6 23 -30 53 45 - 55 0 0 -29 36 39 21 37 13 32 94 -8 -29 8 59 -30 4 21 -28 13 8 -31 0 21 - 54 0 0 -29 42 58 21 37 8 33 93 -9 -29 15 19 -30 10 38 -28 19 31 -31 6 36 - 53 0 0 -29 48 54 21 37 3 34 92 -10 -29 21 17 -30 16 33 -28 25 31 -31 12 29 - 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0 52 9 73 0 0 1 4 27 21 20 40 27 249 -52 1 34 22 0 34 30 2 34 45 - 0 26 5 74 0 0 1 30 19 21 20 35 26 249 -51 2 0 13 1 0 24 3 0 32 - 0 0 8 75 0 0 1 56 2 21 20 31 25 249 -50 2 25 54 1 26 8 3 26 10 0 25 40 76 0 0 2 21 35 21 20 26 24 249 -49 2 51 26 1 51 43 3 51 39 0 51 19 77 0 0 2 46 59 21 20 22 22 249 -48 3 16 47 2 17 9 4 16 57 1 16 48 78 0 0 3 12 11 21 20 18 21 249 -47 3 41 58 2 42 23 4 42 4 1 42 6 79 0 0 3 37 13 21 20 14 20 249 -46 4 6 57 3 7 26 5 6 59 2 7 13 80 0 0 4 2 2 21 20 11 19 249 -45 4 31 45 3 32 18 5 31 42 2 32 8 81 0 0 4 26 39 21 20 7 18 249 -44 4 56 20 3 56 57 5 56 13 2 56 52 82 0 0 4 51 3 21 20 4 17 250 -43 5 20 41 4 21 23 6 20 30 3 21 22 83 0 0 5 15 13 21 20 1 16 250 -42 5 44 50 4 45 35 6 44 34 3 45 39 84 0 0 5 39 9 21 19 58 15 250 -41 6 8 44 5 9 34 7 8 24 4 9 42 85 0 0 6 2 51 21 19 55 14 250 -40 6 32 23 5 33 18 7 31 58 4 33 31 86 0 0 6 26 18 21 19 53 13 250 -39 6 55 47 5 56 47 7 55 18 4 57 5 87 0 0 6 49 29 21 19 51 12 250 -37 7 18 56 6 20 1 8 18 22 5 20 24 88 0 0 7 12 24 21 19 49 11 250 -36 7 41 49 6 42 58 8 41 9 5 43 26 89 0 0 7 35 3 21 19 47 10 250 -35 8 4 25 7 5 40 9 3 40 6 6 13 90 0 0 7 57 25 21 19 45 9 250 -34 8 26 44 7 28 4 9 25 54 6 28 42 91 0 0 8 19 29 21 19 43 8 251 -33 8 48 46 7 50 11 9 47 51 6 50 55 92 0 0 8 41 16 21 19 42 7 251 -32 9 10 30 8 12 0 10 9 29 7 12 49 93 0 0 9 2 44 21 19 41 6 251 -31 9 31 56 8 33 31 10 30 50 7 34 26 94 0 0 9 23 54 21 19 40 4 251 -30 9 53 3 8 54 44 10 51 51 7 55 44 95 0 0 9 44 45 21 19 39 3 251 -29 10 13 51 9 15 37 11 12 34 8 16 43 96 0 0 10 5 16 21 19 39 2 251 -28 10 34 19 9 36 12 11 32 57 8 37 23 97 0 0 10 25 28 21 19 39 1 251 -27 10 54 28 9 56 26 11 53 0 8 57 43 98 0 0 10 45 20 21 19 38 0 252 -26 11 14 17 10 16 21 .. .. .. 9 17 43 Uncertainty in time = +/- 9 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: UCAC2 25142348 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 50 41.6446 DE: -17 56 22.672 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .053, .056 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1015) Christa approx. diameter [km]: 101 approx. diameter ["]: .057 distance from Earth [AU]: 2.43000 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1079 number of rejected observations: 83 time covered by the observations: 1924 Feb 01 - 2012 Jun 28 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.014, 99° remarks: * orbital elements for (1015) Christa : Mean anomaly = 239.23541122 deg Arg. of pericenter = 283.65486464 deg Long. of node = 120.44752362 deg Inclination = 9.46027110 deg Eccentricity = 0.08311463 Semimajor axis = 3.20842849 AU Perihelion dist = 2.94176115 AU Mag: H = 8.97, G = 0.15 Epoch of elements : MJD 56125.89500000 TDT (2012 Jul 17.895) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 17 1015 Christa 21h 29.2m UT 11.3 17 50 41.645-17 56 22.67UCAC2 25142348 0.0 14.2 101 9.1 2.430 -1.516 -6.67 9.2759 -17.938 -140.73 21.00 21.4862 0.03018 -0.09617 -5.98028 -1.84384 0.00264 -0.00052 2000 238.2244152012 712.00000283.654865120.447524 9.4602710.08311463 3.2084285 2.9417611 9.0 5.00.15 RATE 1.7150060 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.057 91 2.01 0.058 0 0-4-2 056116.0020120717_142348 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 21:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org