IOTA/IOTA-ES occultation update for (1443) Ruppina / TYC 1268-00475-1 event on 2012 Nov 22, 00:14 UT Visible from Africa, Brazil Summary ------- On 2012 Nov 22 UT, the 17 km diameter asteroid (1443) Ruppina will occult a 10.5 mag star in the constellation Taurus for observers along a path across Africa, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.4 mag (the magnitude of the asteroid) for at most 1.3 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: 23 * date and approx. time of event: 2012 Nov 22, 00:07 - 2012 Nov 22, 00:21 UT * geocentric midpoint of event [JD]: 2456253.51002917 * magnitude of target star: 10.5 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 1.3 * Moon: 65 % sunlit, 80° distance * Sun: 173° distance * rough path description: Africa, Brazil The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 2.91 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .050 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .035", 83° ) * approx speed of asteroid's shadow [km/s]: 12.5609 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1268-00475-1 by 1443 Ruppina on 2012 Nov 22 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 - 76 0 0 -36 11 57 0 21 55 1 66 -5 -36 6 14 -36 17 40 .. .. .. -36 51 2 - 75 0 0 -35 50 30 0 21 55 2 65 -6 -35 44 47 -35 56 14 .. .. .. -36 29 38 - 74 0 0 -35 28 52 0 21 55 3 65 -7 -35 23 8 -35 34 35 .. .. .. -36 8 1 - 73 0 0 -35 7 1 0 21 54 4 64 -8 -35 1 18 -35 12 45 -34 28 5 -35 46 12 - 72 0 0 -34 44 59 0 21 54 4 64 -9 -34 39 15 -34 50 43 -34 6 1 -35 24 12 - 71 0 0 -34 22 46 0 21 53 5 63 -10 -34 17 2 -34 28 31 -33 43 47 -35 2 1 - 70 0 0 -34 0 23 0 21 52 6 62 -11 -33 54 39 -34 6 7 -33 21 22 -34 39 39 - 69 0 0 -33 37 50 0 21 51 7 62 -12 -33 32 5 -33 43 34 -32 58 48 -34 17 7 - 68 0 0 -33 15 7 0 21 50 8 61 -12 -33 9 22 -33 20 52 -32 36 4 -33 54 26 - 67 0 0 -32 52 15 0 21 48 9 61 -13 -32 46 31 -32 58 0 -32 13 11 -33 31 35 - 66 0 0 -32 29 15 0 21 47 10 60 -14 -32 23 30 -32 35 0 -31 50 10 -33 8 35 - 65 0 0 -32 6 7 0 21 45 11 60 -15 -32 0 22 -32 11 52 -31 27 1 -32 45 28 - 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2012 Sep 26 1 sigma uncertainty ellipse (major, minor, PA): 0.045, 0.027, 81° remarks: * orbital elements for (1443) Ruppina : Mean anomaly = 78.27547019 deg Arg. of pericenter = 164.07686474 deg Long. of node = 175.08064034 deg Inclination = 1.92738558 deg Eccentricity = 0.06095059 Semimajor axis = 2.94224560 AU Perihelion dist = 2.76291399 AU Mag: H = 10.97, G = 0.15 Epoch of elements : MJD 56253.01000000 TDT (2012 Nov 22.010) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 22 1443 Ruppina 0h 14.4m UT 10.5 4 20 59.154 18 44 3.61TYC 1268-00475-1 10.7 15.4 17 1.3 1.934 -2.228 -6.15 0.2408 18.735 172.92 -20.17 0.2407 0.08874 -0.45657 -6.95932 -1.35350 -0.00070 0.00016 2000 77.68763920121119.00000164.076865175.080640 1.9273860.06095059 2.9422456 2.762914011.4 5.00.15 RATE 1.9529260 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.050 0.035 83 3.91 0.035 0 0-3 0 056247.0020121122_0475-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org