IOTA/IOTA-ES occultation update for (8) Flora / TYC 4979-00614-1 event on 2009 Apr 06, 14:48 UT Visible from Summary ------- On 2009 Apr 06 UT, the 185 km diameter asteroid (8) Flora will occult a 11.8 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 0.2 mag to 9.9 mag (the magnitude of the asteroid) for at most 16.1 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: 100 * date and approx. time of event: 2009 Apr 06, 14:42 - 2009 Apr 06, 14:55 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 0.2 * estimated maximum duration [s]: 16.1 * Moon: 89 % sunlit, 55° distance * Sun: 162° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 245 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .023", 95° ) * approx speed of asteroid's shadow [km/s]: 11.4922 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4979-00614-1 by 8 Flora on 2009 Apr 6 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 73 0 0 65 8 7 14 55 38 0 99 -5 66 15 48 64 1 35 66 34 59 63 43 9 74 0 0 65 4 10 14 55 38 1 100 -5 66 11 58 63 57 32 66 31 10 63 39 4 75 0 0 64 59 58 14 55 38 1 101 -5 66 7 52 63 53 13 66 27 6 63 34 43 76 0 0 64 55 30 14 55 38 2 102 -6 66 3 32 63 48 38 66 22 48 63 30 7 77 0 0 64 50 47 14 55 38 2 102 -6 65 58 56 63 43 48 66 18 15 63 25 15 78 0 0 64 45 49 14 55 37 2 103 -7 65 54 6 63 38 43 66 13 27 63 20 8 79 0 0 64 40 36 14 55 37 3 104 -7 65 49 1 63 33 22 66 8 24 63 14 44 80 0 0 64 35 7 14 55 37 3 105 -7 65 43 40 63 27 44 66 3 6 63 9 5 81 0 0 64 29 22 14 55 37 4 106 -8 65 38 4 63 21 51 65 57 32 63 3 9 82 0 0 64 23 21 14 55 36 4 107 -8 65 32 13 63 15 42 65 51 43 62 56 57 83 0 0 64 17 4 14 55 36 5 108 -9 65 26 6 63 9 16 65 45 39 62 50 29 84 0 0 64 10 32 14 55 35 5 109 -9 65 19 43 63 2 34 65 39 19 62 43 45 85 0 0 64 3 43 14 55 35 6 110 -10 65 13 4 62 55 36 65 32 43 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28 20 259 -2 18 48 59 16 35 1 19 8 6 16 16 37 -133 0 0 17 33 53 14 42 24 19 260 -1 18 41 22 16 27 33 19 0 28 16 9 10 Uncertainty in time = +/- 2 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 4979-00614-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 14 45.6541 DE: -03 26 22.199 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .021 ) * V mag [mag]: 11.8 * B mag [mag]: 12.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8) Flora approx. diameter [km]: 185 approx. diameter ["]: .162 distance from Earth [AU]: 1.57000 * orbital information: orbit source: Preston date of fit: 2008 Mar 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1549 number of rejected observations: 275 time covered by the observations: 1905 Jun 19 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.010, 112° remarks: * orbital elements for (8) Flora : Mean anomaly = 166.52570146 deg Arg. of pericenter = 285.41080307 deg Long. of node = 110.95908624 deg Inclination = 5.88907010 deg Eccentricity = 0.15667061 Semimajor axis = 2.20106061 AU Perihelion dist = 1.85621911 AU Mag: H = 6.47, G = 0.28 Epoch of elements : MJD 54927.61700000 TDT (2009 Apr 06.617) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 6 8 Flora 14h 48.7m UT 11.8 14 14 45.654- 3 26 22.20TYC 4979-00614-1 12.2 9.9 185 16.1 1.570 -2.216 14.86 156.4947 -3.443 -41.58 6.66 14.8114 0.26841 0.59840 -5.91952 2.65227 -0.00172 -0.00033 2000 164.2266952009 330.00000285.410803110.959086 5.8890700.15667061 2.2010606 1.8562191 6.5 5.00.28 RATE 3.0182560 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.025 0.023 95 1.14 0.023 0 54545.5020090406_0614-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 06:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org