IOTA/IOTA-ES occultation update for (1556) Wingolfia / TYC 5279-00592-1 event on 2009 Sep 03, 12:16 UT Visible from Summary ------- On 2009 Sep 03 UT, the 29 km diameter asteroid (1556) Wingolfia will occult a 9.8 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 15.5 mag (the magnitude of the asteroid) for at most 3.9 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: 28 * date and approx. time of event: 2009 Sep 03, 12:04 - 2009 Sep 03, 12:30 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 3.9 * Moon: 99 % sunlit, 56° distance * Sun: 136° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 2.36 * 1 sigma uncertainty interval [seconds]: +/- 9.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .038", 67° ) * approx speed of asteroid's shadow [km/s]: 7.4256 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5279-00592-1 by 1556 Wingolfia on 2009 Sep 3 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 Latitude Latitude Latitude Latitude - 97 0 0 35 52 41 12 4 20 29 226 0 36 4 20 35 41 2 36 59 15 34 45 57 - 98 0 0 34 58 38 12 4 28 30 226 -1 35 10 25 34 46 49 36 6 3 33 51 2 - 99 0 0 34 2 41 12 4 38 31 225 -2 34 14 38 33 50 43 35 10 59 32 54 12 -100 0 0 33 4 48 12 4 48 33 225 -3 33 16 55 32 52 42 34 13 59 31 55 26 -101 0 0 32 4 58 12 4 59 34 224 -4 32 17 14 31 52 42 33 15 3 30 54 42 -102 0 0 31 3 7 12 5 10 35 224 -5 31 15 32 30 50 41 32 14 6 29 51 56 -103 0 0 29 59 13 12 5 22 37 223 -6 30 11 48 29 46 38 31 11 8 28 47 6 -104 0 0 28 53 15 12 5 34 38 223 -7 29 6 0 28 40 29 30 6 5 27 40 11 -105 0 0 27 45 10 12 5 47 39 223 -8 27 58 5 27 32 14 28 58 57 26 31 9 -106 0 0 26 34 57 12 6 1 41 222 -9 26 48 2 26 21 52 27 49 41 25 19 59 -107 0 0 25 22 35 12 6 16 42 222 -10 25 35 50 25 9 20 26 38 16 24 6 40 -108 0 0 24 8 3 12 6 32 44 222 -12 24 21 28 23 54 38 25 24 41 22 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17 9 -69 56 11 104 0 0 -68 56 34 12 30 46 3 115 -15 -68 47 51 -69 5 17 -68 6 45 -69 46 29 103 0 0 -68 46 1 12 30 47 3 116 -14 -68 37 14 -68 54 48 -67 55 50 -69 36 19 102 0 0 -68 34 58 12 30 47 3 117 -14 -68 26 7 -68 43 49 -67 44 24 -69 25 39 101 0 0 -68 23 24 12 30 47 2 118 -14 -68 14 29 -68 32 20 -67 32 26 -69 14 30 100 0 0 -68 11 18 12 30 48 2 119 -13 -68 2 19 -68 20 18 -67 19 54 -69 2 49 99 0 0 -67 58 39 12 30 48 1 120 -13 -67 49 35 -68 7 43 -67 6 48 -68 50 36 98 0 0 -67 45 25 12 30 48 1 121 -13 -67 36 16 -67 54 34 -66 53 7 -68 37 50 97 0 0 -67 31 35 12 30 48 1 121 -12 -67 22 21 -67 40 50 -66 38 48 -68 24 29 96 0 0 -67 17 8 12 30 48 0 122 -12 .. .. .. -67 26 28 .. .. .. -68 10 33 Uncertainty in time = +/- 11 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 5279-00592-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 46 50.3750 DE: -12 09 03.285 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 9.8 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1556) Wingolfia approx. diameter [km]: 29 approx. diameter ["]: .018 distance from Earth [AU]: 2.23600 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 675 number of rejected observations: 15 time covered by the observations: 1942 Jan 14 - 2007 Aug 18 1 sigma uncertainty ellipse (major, minor, PA): 0.045, 0.032, 62° remarks: * orbital elements for (1556) Wingolfia : Mean anomaly = 4.88637086 deg Arg. of pericenter = 269.55543801 deg Long. of node = 91.64187622 deg Inclination = 15.75198852 deg Eccentricity = 0.11119855 Semimajor axis = 3.42334542 AU Perihelion dist = 3.04267439 AU Mag: H = 10.36, G = 0.15 Epoch of elements : MJD 55077.51100000 TDT (2009 Sep 03.511) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 3 1556 Wingolfia 12h 16.7m UT 9.8 1 46 50.375-12 9 3.28TYC 5279-00592-1 11.2 15.5 29 3.9 2.236 -0.521 -14.62 -140.2241 -12.147 -4.33 7.39 12.2777 0.12301 -0.06385 -1.93897 -3.71575 -0.00392 0.00013 2000 3.7176102009 827.00000269.555438 91.641876 15.7519890.11119855 3.4233454 3.042674410.6 5.00.15 RATE 1.5560660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.038 67 3.36 0.042 0 54581.5020090903_0592-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org