IOTA/IOTA-ES occultation update for (906) Repsolda / 2UCAC 43582029 event on 2012 Dec 10, 13:13 UT Visible from Hawaii, Japan, China Summary ------- On 2012 Dec 10 UT, the 69 km diameter asteroid (906) Repsolda will occult a 12.3 mag star in the constellation Auriga for observers along a path across Hawaii, Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.6 mag (the magnitude of the asteroid) for at most 5.1 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: 44 * date and approx. time of event: 2012 Dec 10, 13:05 - 2012 Dec 10, 13:21 UT * geocentric midpoint of event [JD]: 2456272.0511125 * magnitude of target star: 12.3 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 5.1 * Moon: 11 % sunlit, 141° distance * Sun: 169° distance * rough path description: Hawaii, Japan, China The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 1.48 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .073) * 1 sigma uncertainty ellipse (major, minor, PA): ( .073", .051", 359° ) * approx speed of asteroid's shadow [km/s]: 13.4878 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 43582029 by 906 Repsolda on 2012 Dec 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 ' " Latitude Latitude Latitude Latitude 66 0 0 5 36 53 13 21 28 3 56 0 5 59 23 5 14 22 7 5 58 4 7 42 67 0 0 6 16 49 13 21 28 4 56 -2 6 39 17 5 54 21 7 45 46 4 47 47 68 0 0 6 56 29 13 21 27 5 56 -3 7 18 55 6 34 3 8 25 17 5 27 37 69 0 0 7 35 52 13 21 26 7 57 -4 7 58 15 7 13 29 9 4 29 6 7 10 70 0 0 8 14 56 13 21 25 8 57 -5 8 37 17 7 52 36 9 43 23 6 46 24 71 0 0 8 53 41 13 21 23 9 57 -6 9 15 58 8 31 23 10 21 56 7 25 20 72 0 0 9 32 4 13 21 22 10 57 -7 9 54 19 9 9 49 11 0 8 8 3 55 73 0 0 10 10 6 13 21 20 11 57 -9 10 32 18 9 47 54 11 37 58 8 42 10 74 0 0 10 47 45 13 21 18 12 57 -10 11 9 54 10 25 37 12 15 24 9 20 1 75 0 0 11 25 1 13 21 16 14 58 -11 11 47 6 11 2 55 12 52 27 9 57 30 76 0 0 12 1 52 13 21 13 15 58 -12 12 23 53 11 39 50 13 29 4 10 34 34 77 0 0 12 38 17 13 21 11 16 58 -13 13 0 15 12 16 19 14 5 16 11 11 14 78 0 0 13 14 17 13 21 8 17 58 -14 13 36 11 12 52 22 14 41 1 11 47 28 79 0 0 13 49 49 13 21 6 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Uncertainty in time = +/- 8 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: 2UCAC 43582029 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 04 00.3217 DE: +33 52 46.396 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .045, .071 ) * V mag [mag]: 12.3 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (906) Repsolda approx. diameter [km]: 69 approx. diameter ["]: .049 distance from Earth [AU]: 1.95900 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1058 number of rejected observations: 60 time covered by the observations: 1916 Apr 11 - 2012 Nov 28 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.016, 75° remarks: * orbital elements for (906) Repsolda : Mean anomaly = 93.13300641 deg Arg. of pericenter = 296.03414832 deg Long. of node = 40.31264191 deg Inclination = 11.79088969 deg Eccentricity = 0.08376592 Semimajor axis = 2.89802645 AU Perihelion dist = 2.65527060 AU Mag: H = 9.24, G = 0.15 Epoch of elements : MJD 56271.55100000 TDT (2012 Dec 10.551) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 10 906 Repsolda 13h 13.6m UT 12.3 5 4 0.322 33 52 46.402UCAC 43582029 0.0 13.6 69 5.1 1.959 -2.732 3.25 157.9310 33.879 -20.14 -22.97 13.2267 -0.00123 -0.01283 -7.57817 0.72645 0.00014 -0.00114 2000 92.823148201212 9.00000296.034148 40.312642 11.7908900.08376592 2.8980265 2.6552706 9.5 5.00.15 RATE 1.9977940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.073 0.051 359 2.48 0.072 0 0-3-4 056264.0020121210_582029 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org