IOTA/IOTA-ES occultation update for (5081) Sanguin / TYC 1907-00864-1 event on 2012 Dec 23, 23:03 UT Visible from Africa, Madagascar Summary ------- On 2012 Dec 23 UT, the 17 km diameter asteroid (5081) Sanguin will occult a 9.3 mag star in the constellation Gemini for observers along a path across Africa, Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 15.5 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: 18 * date and approx. time of event: 2012 Dec 23, 22:56 - 2012 Dec 23, 23:09 UT * geocentric midpoint of event [JD]: 2456285.46057083 * magnitude of target star: 9.3 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 1.3 * Moon: 83 % sunlit, 59° distance * Sun: 168° distance * rough path description: Africa, Madagascar The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 3.76 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .053) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .053", 85° ) * approx speed of asteroid's shadow [km/s]: 13.1057 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1907-00864-1 by 5081 Sanguin on 2012 Dec 23 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 - 60 0 0 - 8 6 31 23 9 52 1 61 -13 - 8 0 3 - 8 12 59 .. .. .. - 9 2 1 - 59 0 0 - 7 34 34 23 9 51 2 61 -14 - 7 28 9 - 7 41 0 .. .. .. - 8 29 42 - 58 0 0 - 7 3 30 23 9 51 3 61 -15 - 6 57 7 - 7 9 54 .. .. .. - 7 58 17 - 57 0 0 - 6 33 17 23 9 50 4 61 -16 - 6 26 57 - 6 39 39 .. .. .. - 7 27 43 - 56 0 0 - 6 3 56 23 9 49 5 60 -17 - 5 57 38 - 6 10 15 .. .. .. - 6 58 2 - 55 0 0 - 5 35 27 23 9 48 6 60 -18 - 5 29 11 - 5 41 44 - 4 42 20 - 6 29 13 - 54 0 0 - 5 7 49 23 9 47 8 60 -19 - 5 1 35 - 5 14 4 - 4 15 0 - 6 1 17 - 53 0 0 - 4 41 2 23 9 45 9 60 -20 - 4 34 51 - 4 47 15 - 3 48 31 - 5 34 12 - 52 0 0 - 4 15 7 23 9 43 10 60 -21 - 4 8 57 - 4 21 17 - 3 22 53 - 5 7 58 - 51 0 0 - 3 50 2 23 9 41 11 60 -23 - 3 43 54 - 3 56 10 - 2 58 5 - 4 42 37 - 50 0 0 - 3 25 48 23 9 39 12 60 -24 - 3 19 42 - 3 31 55 - 2 34 7 - 4 18 6 - 49 0 0 - 3 2 25 23 9 37 13 60 -25 - 2 56 21 - 3 8 29 - 2 10 58 - 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2012 Nov 26 1 sigma uncertainty ellipse (major, minor, PA): 0.064, 0.048, 84° remarks: * orbital elements for (5081) Sanguin : Mean anomaly = 219.97959950 deg Arg. of pericenter = 163.45658705 deg Long. of node = 83.30164624 deg Inclination = 13.19567124 deg Eccentricity = 0.11328273 Semimajor axis = 2.31949568 AU Perihelion dist = 2.05673689 AU Mag: H = 12.43, G = 0.15 Epoch of elements : MJD 56284.96100000 TDT (2012 Dec 23.961) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 23 5081 Sanguin 23h 3.2m UT 9.3 6 58 45.399 28 36 57.67TYC 1907-00864-1 9.8 15.5 17 1.3 1.562 -2.859 17.85 25.9975 28.610 -165.92 -23.41 23.0537 -0.24604 -0.51877 -6.68366 3.16978 -0.00110 -0.00048 2000 218.59545020121219.00000163.456587 83.301646 13.1956710.11328273 2.3194957 2.056736912.1 5.00.15 RATE 2.7900610 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.068 0.053 85 4.76 0.056 0 0-5 4 056264.0020121223_0864-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 30, 00:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org