IOTA/IOTA-ES occultation update for (582) Olympia / UCAC2 34023370 event on 2009 Jun 09, 17:45 UT Visible from Summary ------- On 2009 Jun 09 UT, the 49 km diameter asteroid (582) Olympia will occult a 12.0 mag star in the constellation Equuleus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 14.6 mag (the magnitude of the asteroid) for at most 16.8 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: 33 * date and approx. time of event: 2009 Jun 09, 17:15 - 2009 Jun 09, 18:16 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 16.8 * Moon: 97 % sunlit, 45° distance * Sun: 118° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 2.00 * 1 sigma uncertainty interval [seconds]: +/- 33.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .053 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .053", .052", 92° ) * approx speed of asteroid's shadow [km/s]: 2.9062 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 34023370 by 582 Olympia on 2009 Jun 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 53 0 0 - 4 9 44 18 16 31 0 84 -53 - 3 53 34 - 4 25 57 .. .. .. - 5 31 24 54 0 0 - 4 3 55 18 16 31 1 84 -54 - 3 47 47 - 4 20 7 .. .. .. - 5 25 26 55 0 0 - 3 58 45 18 16 29 2 84 -55 - 3 42 39 - 4 14 55 .. .. .. - 5 20 6 56 0 0 - 3 54 14 18 16 27 3 84 -56 - 3 38 9 - 4 10 22 .. .. .. - 5 15 26 57 0 0 - 3 50 20 18 16 24 4 84 -56 - 3 34 16 - 4 6 26 .. .. .. - 5 11 24 58 0 0 - 3 47 3 18 16 20 5 84 -57 - 3 31 1 - 4 3 8 .. .. .. - 5 8 0 59 0 0 - 3 44 24 18 16 15 6 83 -58 - 3 28 23 - 4 0 28 .. .. .. - 5 5 14 60 0 0 - 3 42 22 18 16 10 7 83 -58 - 3 26 22 - 3 58 24 - 2 22 53 - 5 3 6 61 0 0 - 3 40 56 18 16 4 8 83 -59 - 3 24 57 - 3 56 57 - 2 21 33 - 5 1 34 62 0 0 - 3 40 6 18 15 57 9 83 -60 - 3 24 8 - 3 56 7 - 2 20 47 - 5 0 40 63 0 0 - 3 39 52 18 15 50 10 83 -61 - 3 23 55 - 3 55 52 - 2 20 37 - 5 0 21 64 0 0 - 3 40 13 18 15 41 11 83 -61 - 3 24 17 - 3 56 12 - 2 21 2 - 5 0 39 65 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Uncertainty in time = +/- 34 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 34023370 * constellation : Equuleus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 57 38.6329 DE: +06 00 20.678 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .051, .051 ) * V mag [mag]: 12.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (582) Olympia approx. diameter [km]: 49 approx. diameter ["]: .026 distance from Earth [AU]: 2.57400 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1002 number of rejected observations: 67 time covered by the observations: 1906 Feb 15 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.010, 109° remarks: * orbital elements for (582) Olympia : Mean anomaly = 198.51864240 deg Arg. of pericenter = 310.06885708 deg Long. of node = 155.77257732 deg Inclination = 30.02472539 deg Eccentricity = 0.22351511 Semimajor axis = 2.61142207 AU Perihelion dist = 2.02772978 AU Mag: H = 8.94, G = 0.15 Epoch of elements : MJD 54991.74000000 TDT (2009 Jun 09.740) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 9 582 Olympia 17h 46.2m UT 12.0 20 57 38.633 6 0 20.68UCAC2 34023370 0.0 14.6 49 16.8 2.574 -0.328 2.76 149.6444 6.005 -86.71 22.99 17.7693 -0.27426 -0.48236 -1.42656 0.80972 -0.00433 -0.00248 2000 198.1122572009 6 8.00000310.068857155.772577 30.0247250.22351511 2.6114221 2.0277298 9.1 5.00.15 RATE 2.3355460 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.053 0.052 92 3.00 0.053 0 54545.5020090609_023370 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org