IOTA/IOTA-ES occultation update for (672) Astarte / TYC 5529-00885-1 event on 2009 Mar 29, 12:39 UT Visible from Japan, Russia Summary ------- On 2009 Mar 29 UT, the 34 km diameter asteroid (672) Astarte will occult a 10.8 mag star in the constellation Virgo for observers along a path across Japan, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 14.5 mag (the magnitude of the asteroid) for at most 2.8 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: 57 * date and approx. time of event: 2009 Mar 29, 12:34 - 2009 Mar 29, 12:45 UT * magnitude of target star: 10.8 * magnitude drop [mag]: 3.7 * estimated maximum duration [s]: 2.8 * Moon: 10 % sunlit, 145° distance * Sun: 172° distance * rough path description: Japan, Russia The occultation path -------------------- * approximate projected width [km]: 50 * 1 sigma uncertainty interval [path widths]: +/- 1.10 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .029", 117° ) * approx speed of asteroid's shadow [km/s]: 12.3386 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5529-00885-1 by 672 Astarte on 2009 Mar 29 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 94 0 0 53 17 39 12 45 40 0 110 -6 53 32 10 53 3 11 .. .. .. .. .. .. 95 0 0 53 4 56 12 45 40 1 110 -6 53 19 28 52 50 28 53 51 42 .. .. .. 96 0 0 52 52 5 12 45 39 2 111 -7 53 6 38 52 37 36 53 38 53 .. .. .. 97 0 0 52 39 7 12 45 39 2 112 -8 52 53 40 52 24 37 53 25 57 .. .. .. 98 0 0 52 26 1 12 45 39 3 113 -8 52 40 35 52 11 31 53 12 52 .. .. .. 99 0 0 52 12 48 12 45 38 3 114 -9 52 27 22 51 58 18 52 59 41 51 26 38 100 0 0 51 59 28 12 45 38 4 114 -9 52 14 3 51 44 57 52 46 22 51 13 17 101 0 0 51 46 1 12 45 37 5 115 -10 52 0 36 51 31 30 52 32 57 50 59 49 102 0 0 51 32 28 12 45 36 5 116 -11 51 47 3 51 17 57 52 19 25 50 46 15 103 0 0 51 18 49 12 45 35 6 117 -11 51 33 24 51 4 17 52 5 46 50 32 35 104 0 0 51 5 3 12 45 34 7 117 -12 51 19 39 50 50 31 51 52 2 50 18 48 105 0 0 50 51 12 12 45 33 7 118 -13 51 5 48 50 36 40 51 38 11 50 4 56 106 0 0 50 37 15 12 45 32 8 119 -13 50 51 52 50 22 43 51 24 15 49 50 59 107 0 0 50 23 13 12 45 31 9 120 -14 50 37 50 50 8 41 51 10 14 49 36 57 108 0 0 50 9 6 12 45 29 9 121 -15 50 23 43 49 54 34 50 56 7 49 22 49 109 0 0 49 54 55 12 45 28 10 121 -15 50 9 31 49 40 22 50 41 56 49 8 37 110 0 0 49 40 39 12 45 26 11 122 -16 49 55 15 49 26 6 50 27 40 48 54 21 111 0 0 49 26 18 12 45 24 11 123 -17 49 40 55 49 11 46 50 13 20 48 40 1 112 0 0 49 11 54 12 45 23 12 124 -18 49 26 31 48 57 22 49 58 55 48 25 37 113 0 0 48 57 27 12 45 21 13 125 -18 49 12 4 48 42 55 49 44 28 48 11 10 114 0 0 48 42 56 12 45 18 13 125 -19 48 57 33 48 28 24 49 29 57 47 56 40 115 0 0 48 28 23 12 45 16 14 126 -20 48 42 59 48 13 50 49 15 22 47 42 7 116 0 0 48 13 46 12 45 14 15 127 -20 48 28 22 47 59 14 49 0 46 47 27 31 117 0 0 47 59 8 12 45 11 15 128 -21 48 13 44 47 44 36 48 46 6 47 12 53 118 0 0 47 44 27 12 45 9 16 128 -22 47 59 3 47 29 56 48 31 25 46 58 14 119 0 0 47 29 45 12 45 6 17 129 -22 47 44 21 47 15 14 48 16 42 46 43 33 120 0 0 47 15 2 12 45 3 18 130 -23 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20 12 34 3 4 252 -11 38 28 26 38 0 17 38 59 42 37 29 38 -113 0 0 38 25 43 12 34 3 4 252 -10 38 39 50 38 11 39 39 11 8 .. .. .. -112 0 0 38 37 18 12 34 2 3 253 -9 38 51 26 38 23 13 39 22 46 .. .. .. -111 0 0 38 49 5 12 34 2 2 254 -8 39 3 14 38 34 59 39 34 37 .. .. .. -110 0 0 39 1 3 12 34 1 1 254 -8 39 15 14 38 46 57 39 46 38 .. .. .. -109 0 0 39 13 13 12 34 1 0 255 -7 39 27 25 38 59 6 39 58 52 .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2009 Mar 19.0 Data for the target star ------------------------ * name: TYC 5529-00885-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 25 06.0870 DE: -11 21 02.962 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.8 * B mag [mag]: 11.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (672) Astarte approx. diameter [km]: 34 approx. diameter ["]: .029 distance from Earth [AU]: 1.59800 * orbital information: orbit source: Preston date of fit: 2009 Mar 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 860 number of rejected observations: 36 time covered by the observations: 1907 Apr 04 - 2009 Mar 18 1 sigma uncertainty ellipse (major, minor, PA): 0.045, 0.021, 123° remarks: * orbital elements for (672) Astarte : Mean anomaly = 271.85684905 deg Arg. of pericenter = 309.52043370 deg Long. of node = 343.99698034 deg Inclination = 11.13286224 deg Eccentricity = 0.13382243 Semimajor axis = 2.55620844 AU Perihelion dist = 2.21413042 AU Mag: H = 11.51, G = 0.15 Epoch of elements : MJD 54919.52800000 TDT (2009 Mar 29.528) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Mar 29 672 Astarte 12h 39.8m UT 10.8 12 25 6.087-11 21 2.96TYC 5529-00885-1 11.7 14.5 34 2.8 1.598 -2.584 4.89 169.2629 -11.351 -8.78 3.55 12.6641 0.09371 0.72899 -6.90733 0.88846 0.00020 0.00077 2000 269.5590532009 320.00000309.520434343.996980 11.1328620.13382243 2.5562084 2.214130411.1 5.00.15 RATE 2.4116250 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.029 117 2.10 0.032 0 54909.0020090329_0885-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Mar 18, 17:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org