IOTA/IOTA-ES occultation update for (1544) Vinterhansenia / TYC 4972-00073-1 event on 2009 May 09, 14:50 UT Visible from Summary ------- On 2009 May 09 UT, the 22 km diameter asteroid (1544) Vinterhansenia will occult a 9.4 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.1 mag to 15.5 mag (the magnitude of the asteroid) for at most 2.3 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: 39 * date and approx. time of event: 2009 May 09, 14:39 - 2009 May 09, 14:59 UT * magnitude of target star: 9.4 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 2.3 * Moon: 100 % sunlit, 30° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 1.67 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .030", 110° ) * approx speed of asteroid's shadow [km/s]: 9.6322 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4972-00073-1 by 1544 Vinterhansenia on 2009 May 9 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 54 0 0 27 36 49 14 59 44 25 113 0 27 43 20 27 30 17 28 5 10 27 8 32 55 0 0 27 23 24 14 59 39 26 114 -1 27 29 56 27 16 52 27 51 46 26 55 7 56 0 0 27 9 50 14 59 35 27 115 -2 27 16 22 27 3 18 27 38 13 26 41 32 57 0 0 26 56 7 14 59 30 27 115 -3 27 2 40 26 49 35 27 24 32 26 27 48 58 0 0 26 42 16 14 59 24 28 116 -4 26 48 48 26 35 44 27 10 41 26 13 56 59 0 0 26 28 16 14 59 19 29 116 -5 26 34 49 26 21 44 26 56 42 25 59 55 60 0 0 26 14 8 14 59 14 30 117 -6 26 20 41 26 7 36 26 42 35 25 45 46 61 0 0 25 59 52 14 59 8 31 117 -7 26 6 25 25 53 20 26 28 20 25 31 30 62 0 0 25 45 29 14 59 2 32 118 -8 25 52 2 25 38 56 26 13 57 25 17 5 63 0 0 25 30 58 14 58 56 33 118 -8 25 37 31 25 24 25 25 59 27 25 2 33 64 0 0 25 16 19 14 58 50 34 119 -9 25 22 53 25 9 46 25 44 49 24 47 54 65 0 0 25 1 34 14 58 44 35 119 -10 25 8 8 24 55 1 25 30 5 24 33 8 66 0 0 24 46 42 14 58 37 35 120 -11 24 53 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Uncertainty in time = +/- 6 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 4972-00073-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 33 50.4358 DE: -07 17 03.342 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 9.4 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1544) Vinterhansenia approx. diameter [km]: 22 approx. diameter ["]: .018 distance from Earth [AU]: 1.64700 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 858 number of rejected observations: 42 time covered by the observations: 1906 Feb 16 - 2008 Mar 12 1 sigma uncertainty ellipse (major, minor, PA): 0.043, 0.023, 114° remarks: * orbital elements for (1544) Vinterhansenia : Mean anomaly = 152.02220688 deg Arg. of pericenter = 356.52717234 deg Long. of node = 60.05073940 deg Inclination = 3.33325655 deg Eccentricity = 0.10539457 Semimajor axis = 2.37274933 AU Perihelion dist = 2.12267443 AU Mag: H = 11.85, G = 0.15 Epoch of elements : MJD 54960.61800000 TDT (2009 May 09.618) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 9 1544 Vinterhansenia 14h 50.4m UT 9.4 13 33 50.436- 7 17 3.34TYC 4972-00073-1 10.5 15.5 22 2.3 1.647 -1.895 6.86 113.3085 -7.286 -43.49 17.50 14.8400 0.07727 0.31830 -5.28221 1.28668 0.00207 -0.00103 2000 151.8555532009 5 9.00000356.527172 60.050739 3.3332570.10539457 2.3727493 2.122674411.7 5.00.15 RATE 2.6966610 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.030 110 2.67 0.031 0 54581.5020090509_0073-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org