IOTA/IOTA-ES occultation update for (499) Venusia / UCAC2 22738168 event on 2009 Jun 03, 12:17 UT Visible from Summary ------- On 2009 Jun 03 UT, the 81 km diameter asteroid (499) Venusia will occult a 11.0 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.9 mag (the magnitude of the asteroid) for at most 4.7 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: 49 * date and approx. time of event: 2009 Jun 03, 12:10 - 2009 Jun 03, 12:22 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 4.7 * Moon: 83 % sunlit, 55° distance * Sun: 174° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 83 * 1 sigma uncertainty interval [path widths]: +/- 1.30 * 1 sigma uncertainty interval [seconds]: +/- 6.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .038", 92° ) * approx speed of asteroid's shadow [km/s]: 17.1613 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 22738168 by 499 Venusia on 2009 Jun 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 ' " Latitude Latitude Latitude Latitude 88 0 0 - 6 30 23 12 22 57 0 113 -6 .. .. .. - 6 54 53 .. .. .. - 7 58 47 89 0 0 - 6 56 5 12 22 57 1 113 -7 - 6 31 36 - 7 20 36 - 5 28 9 - 8 24 33 90 0 0 - 7 21 54 12 22 57 2 113 -8 - 6 57 24 - 7 46 26 - 5 53 53 - 8 50 27 91 0 0 - 7 47 49 12 22 56 3 113 -10 - 7 23 18 - 8 12 23 - 6 19 45 - 9 16 27 92 0 0 - 8 13 51 12 22 56 4 113 -11 - 7 49 19 - 8 38 26 - 6 45 43 - 9 42 33 93 0 0 - 8 39 59 12 22 55 6 112 -12 - 8 15 26 - 9 4 34 - 7 11 47 -10 8 44 94 0 0 - 9 6 11 12 22 54 7 112 -13 - 8 41 37 - 9 30 48 - 7 37 55 -10 34 59 95 0 0 - 9 32 27 12 22 53 8 112 -14 - 9 7 52 - 9 57 5 - 8 4 9 -11 1 19 96 0 0 - 9 58 47 12 22 52 9 112 -15 - 9 34 11 -10 23 25 - 8 30 26 -11 27 41 97 0 0 -10 25 9 12 22 51 10 112 -16 -10 0 33 -10 49 48 - 8 56 46 -11 54 6 98 0 0 -10 51 34 12 22 50 11 112 -17 -10 26 57 -11 16 14 - 9 23 8 -12 20 33 99 0 0 -11 18 0 12 22 49 12 111 -18 -10 53 22 -11 42 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20 15 -24 15 50 - 90 0 0 -22 24 21 12 11 1 12 250 -6 -21 59 58 -22 48 47 -20 56 43 -23 52 31 - 89 0 0 -22 0 41 12 11 0 11 249 -5 -21 36 16 -22 25 9 -20 32 58 -23 28 57 - 88 0 0 -21 36 47 12 10 58 10 249 -4 -21 12 21 -22 1 17 -20 8 58 -23 5 9 - 87 0 0 -21 12 40 12 10 57 9 249 -3 -20 48 11 -21 37 10 -19 44 45 -22 41 7 - 86 0 0 -20 48 19 12 10 56 8 248 -2 -20 23 49 -21 12 51 -19 20 19 -22 16 51 - 85 0 0 -20 23 45 12 10 55 7 248 0 -19 59 14 -20 48 19 -18 55 40 -21 52 23 Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 22738168 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 13 02.6086 DE: -22 56 16.211 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .026 ) * V mag [mag]: 11.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (499) Venusia approx. diameter [km]: 81 approx. diameter ["]: .029 distance from Earth [AU]: 3.84700 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 863 number of rejected observations: 57 time covered by the observations: 1902 Dec 24 - 2008 Feb 11 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.027, 93° remarks: * orbital elements for (499) Venusia : Mean anomaly = 186.46433420 deg Arg. of pericenter = 177.06343591 deg Long. of node = 256.53297332 deg Inclination = 2.09059723 deg Eccentricity = 0.21242485 Semimajor axis = 4.00892921 AU Perihelion dist = 3.15733302 AU Mag: H = 9.42, G = 0.15 Epoch of elements : MJD 54985.51200000 TDT (2009 Jun 03.512) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 3 499 Venusia 12h 16.9m UT 11.0 17 13 2.609-22 56 16.21UCAC2 22738168 0.0 15.9 81 4.7 3.847 -1.594 2.36 -178.0560 -22.939 -4.68 22.37 12.2819 -0.02396 -0.22487 -9.63124 1.03164 -0.00061 0.00005 2000 185.7875182009 529.00000177.063436256.532973 2.0905970.21242485 4.0089292 3.1573330 9.4 5.00.15 RATE 1.2278960 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.038 92 2.30 0.038 0 54545.5020090603_738168 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org