IOTA/IOTA-ES occultation update for (151) Abundantia / TYC 6804-01971-1 event on 2007 Oct 01, 10:48 UT Visible from N Australia Summary ------- On 2007 Oct 01 UT, the 45 km diameter asteroid (151) Abundantia will occult a 10.5 mag star in the constellation Scorpius for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 14.6 mag (the magnitude of the asteroid) for at most 1.5 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: 59 * date and approx. time of event: 2007 Oct 01, 10:45 - 2007 Oct 01, 10:52 UT * midpoint of event [JD]: 2454374.95072083 * magnitude of target star: 10.5 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 1.5 * Moon: 71 % sunlit, 179° distance * Sun: 65° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 1.05 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .023", 94° ) * approx speed of asteroid's shadow [km/s]: 30.2573 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6804-01971-1 by 151 Abundantia on 2007 Oct 01 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 - 6 0 0 7 38 26 10 45 32 0 117 66 7 24 41 7 52 12 6 55 48 .. .. .. - 5 0 0 7 7 19 10 45 32 1 118 67 6 53 33 7 21 5 6 24 38 7 50 0 - 4 0 0 6 36 2 10 45 32 2 118 68 6 22 15 6 49 49 5 53 19 7 18 46 - 3 0 0 6 4 36 10 45 32 4 118 69 5 50 49 6 18 24 5 21 52 6 47 22 - 2 0 0 5 33 3 10 45 32 5 118 70 5 19 16 5 46 51 4 50 17 6 15 51 - 1 0 0 5 1 24 10 45 33 6 118 71 4 47 35 5 15 12 4 18 36 5 44 12 0 0 0 4 29 38 10 45 33 7 118 72 4 15 49 4 43 27 3 46 49 5 12 28 1 0 0 3 57 47 10 45 34 8 118 73 3 43 58 4 11 36 3 14 57 4 40 38 2 0 0 3 25 52 10 45 34 9 118 74 3 12 3 3 39 41 2 43 1 4 8 44 3 0 0 2 53 54 10 45 35 10 118 76 2 40 4 3 7 43 2 11 3 3 36 46 4 0 0 2 21 53 10 45 36 11 118 77 2 8 4 2 35 43 1 39 2 3 4 46 5 0 0 1 49 51 10 45 37 13 118 78 1 36 2 2 3 41 1 7 0 2 32 44 6 0 0 1 17 49 10 45 38 14 118 79 1 3 59 1 31 38 0 34 57 2 0 41 7 0 0 0 45 47 10 45 39 15 118 80 0 31 57 0 59 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Data for the target star ------------------------ * name: TYC 6804-01971-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 43 48.8673 DE: -27 06 43.870 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.5 * B mag [mag]: 10.7 * Apparent position with proper motion RA(deg): 251.0725606609 DE(deg): -27.1288514651 * Equation of equinoxes (radians) : 0.000028731918661 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (151) Abundantia approx. diameter [km]: 45 approx. diameter ["]: .022 distance from Earth [AU]: 2.85800 * orbital information: orbit source: Preston date of fit: 2007 Aug 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 773 number of rejected observations: 75 time covered by the observations: 1902 Mar 13 - 2007 Jul 03 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 103° remarks: * orbital elements for (151) Abundantia : Mean anomaly = 95.88599961 deg Arg. of pericenter = 134.98273802 deg Long. of node = 39.02569710 deg Inclination = 6.43955611 deg Eccentricity = 0.03398495 Semimajor axis = 2.59328130 AU Perihelion dist = 2.50514876 AU Mag: H = 9.02, G = 0.15 Epoch of elements : MJD 54374.45100000 TDT (2007 Oct 01.451) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 01 151 Abundantia 10h 49.0m UT 10.5 16 43 48.867-27 6 43.87TYC 6804-01971-1 10.7 14.6 45 1.5 2.858 3.910 -5.99 78.901 -27.110 15.19 -3.13 10.8173 .00342 .03603 16.96672 -1.94687 0.00508 -0.00087 2000 94.83552132007 927.00000134.982738 39.025697 6.4395560.033984952.593281302.505148769.245 0.15 RATE 2.3600958 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.025 0.023 93.5 2.050 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 03, 05:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org