IOTA/IOTA-ES occultation update for (1128) Astrid / TYC 6812-00487-1 event on 2009 Jul 07, 05:20 UT Visible from Summary ------- On 2009 Jul 07 UT, the 35 km diameter asteroid (1128) Astrid will occult a 10.3 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 4.4 mag to 14.7 mag (the magnitude of the asteroid) for at most 4.4 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: 47 * date and approx. time of event: 2009 Jul 07, 05:07 - 2009 Jul 07, 05:32 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 4.4 * Moon: 100 % sunlit, 25° distance * Sun: 153° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 1.39 * 1 sigma uncertainty interval [seconds]: +/- 6.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .046", .039", 94° ) * approx speed of asteroid's shadow [km/s]: 7.9755 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6812-00487-1 by 1128 Astrid on 2009 Jul 7 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 -173 0 0 - 5 17 1 5 32 21 28 114 -1 - 5 6 44 - 5 27 17 - 4 38 10 - 5 55 50 -172 0 0 - 5 41 25 5 32 15 29 114 -2 - 5 31 9 - 5 51 40 - 5 2 36 - 6 20 11 -171 0 0 - 6 5 36 5 32 7 30 114 -3 - 5 55 21 - 6 15 51 - 5 26 50 - 6 44 19 -170 0 0 - 6 29 34 5 32 0 31 114 -4 - 6 19 20 - 6 39 48 - 5 50 51 - 7 8 15 -169 0 0 - 6 53 19 5 31 53 32 114 -5 - 6 43 5 - 7 3 32 - 6 14 39 - 7 31 57 -168 0 0 - 7 16 49 5 31 45 33 114 -6 - 7 6 37 - 7 27 2 - 6 38 12 - 7 55 25 -167 0 0 - 7 40 6 5 31 37 34 113 -7 - 7 29 54 - 7 50 18 - 7 1 32 - 8 18 38 -166 0 0 - 8 3 8 5 31 29 35 113 -8 - 7 52 57 - 8 13 19 - 7 24 37 - 8 41 37 -165 0 0 - 8 25 55 5 31 21 36 113 -9 - 8 15 45 - 8 36 5 - 7 47 27 - 9 4 21 -164 0 0 - 8 48 27 5 31 12 37 113 -10 - 8 38 17 - 8 58 36 - 8 10 2 - 9 26 50 -163 0 0 - 9 10 43 5 31 3 38 113 -11 - 9 0 34 - 9 20 51 - 8 32 21 - 9 49 3 -162 0 0 - 9 32 43 5 30 55 39 113 -12 - 9 22 35 - 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3 12 8 - 16 0 0 - 2 6 46 5 7 15 2 246 -29 - 1 56 23 - 2 17 8 - 1 27 31 - 2 45 59 - 15 0 0 - 1 40 26 5 7 14 1 246 -28 - 1 30 2 - 1 50 49 - 1 1 9 - 2 19 41 - 14 0 0 - 1 13 57 5 7 14 0 246 -27 .. .. .. - 1 24 21 .. .. .. - 1 53 14 Uncertainty in time = +/- 7 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6812-00487-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 09 52.2635 DE: -23 42 15.097 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .031 ) * V mag [mag]: 10.3 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1128) Astrid approx. diameter [km]: 35 approx. diameter ["]: .028 distance from Earth [AU]: 1.73000 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1081 number of rejected observations: 113 time covered by the observations: 1920 May 10 - 2008 Mar 14 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.023, 96° remarks: * orbital elements for (1128) Astrid : Mean anomaly = 332.32087484 deg Arg. of pericenter = 239.12770019 deg Long. of node = 59.36008977 deg Inclination = 1.01592439 deg Eccentricity = 0.04446285 Semimajor axis = 2.78709390 AU Perihelion dist = 2.66317176 AU Mag: H = 10.75, G = 0.15 Epoch of elements : MJD 55019.22300000 TDT (2009 Jul 07.223) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 7 1128 Astrid 5h 20.6m UT 10.3 17 9 52.264-23 42 15.10TYC 6812-00487-1 10.8 14.7 35 4.4 1.730 -1.661 1.53 -107.9872 -23.705 101.09 22.57 5.3426 0.00237 0.04381 -4.49152 0.30098 0.00245 -0.00015 2000 330.3672152009 628.00000239.127700 59.360090 1.0159240.04446285 2.7870939 2.663171810.7 5.00.15 RATE 2.1182480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.046 0.039 94 2.39 0.039 0 54581.5020090707_0487-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 07:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org