IOTA/IOTA-ES occultation update for (623) Chimaera / TYC 5779-01326-1 event on 2009 Aug 10, 10:50 UT Visible from Summary ------- On 2009 Aug 10 UT, the 44 km diameter asteroid (623) Chimaera will occult a 11.4 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.1 mag (the magnitude of the asteroid) for at most 3.5 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: 65 * date and approx. time of event: 2009 Aug 10, 10:42 - 2009 Aug 10, 10:58 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 3.5 * Moon: 83 % sunlit, 51° distance * Sun: 176° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.93 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .032", 65° ) * approx speed of asteroid's shadow [km/s]: 12.5274 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5779-01326-1 by 623 Chimaera on 2009 Aug 10 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 103 0 0 -14 7 56 10 58 37 2 103 0 -13 55 7 -14 20 45 -13 31 21 -14 44 37 104 0 0 -14 21 41 10 58 37 3 102 -1 -14 8 53 -14 34 31 -13 45 6 -14 58 24 105 0 0 -14 35 30 10 58 36 4 102 -2 -14 22 42 -14 48 19 -13 58 55 -15 12 13 106 0 0 -14 49 21 10 58 35 5 102 -3 -14 36 32 -15 2 10 -14 12 45 -15 26 4 107 0 0 -15 3 14 10 58 34 6 102 -4 -14 50 25 -15 16 3 -14 26 38 -15 39 57 108 0 0 -15 17 9 10 58 33 7 101 -5 -15 4 20 -15 29 58 -14 40 32 -15 53 52 109 0 0 -15 31 5 10 58 32 8 101 -6 -15 18 16 -15 43 55 -14 54 28 -16 7 49 110 0 0 -15 45 2 10 58 31 9 101 -7 -15 32 13 -15 57 52 -15 8 25 -16 21 47 111 0 0 -15 59 1 10 58 29 10 100 -8 -15 46 12 -16 11 51 -15 22 24 -16 35 45 112 0 0 -16 13 0 10 58 28 11 100 -9 -16 0 11 -16 25 50 -15 36 22 -16 49 45 113 0 0 -16 26 59 10 58 26 12 100 -10 -16 14 10 -16 39 50 -15 50 22 -17 3 44 114 0 0 -16 40 59 10 58 24 13 100 -11 -16 28 10 -16 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0 -21 58 44 10 42 30 7 259 -11 -21 45 57 -22 11 32 -21 22 12 -22 35 23 - 74 0 0 -21 45 44 10 42 29 6 259 -10 -21 32 57 -21 58 32 -21 9 11 -22 22 24 - 73 0 0 -21 32 38 10 42 28 5 258 -9 -21 19 51 -21 45 27 -20 56 5 -22 9 19 - 72 0 0 -21 19 27 10 42 27 4 258 -8 -21 6 39 -21 32 15 -20 42 53 -21 56 8 - 71 0 0 -21 6 9 10 42 27 4 258 -7 -20 53 21 -21 18 58 -20 29 35 -21 42 51 - 70 0 0 -20 52 47 10 42 26 3 257 -6 -20 39 58 -21 5 36 -20 16 11 -21 29 29 - 69 0 0 -20 39 19 10 42 26 2 257 -5 -20 26 30 -20 52 8 -20 2 43 -21 16 2 - 68 0 0 -20 25 46 10 42 26 1 257 -4 -20 12 57 -20 38 36 -19 49 10 -21 2 30 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 5779-01326-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 09 39.7783 DE: -12 43 47.107 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 11.4 * B mag [mag]: 11.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (623) Chimaera approx. diameter [km]: 44 approx. diameter ["]: .039 distance from Earth [AU]: 1.54200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 533 number of rejected observations: 47 time covered by the observations: 1909 Sep 12 - 2008 Feb 16 1 sigma uncertainty ellipse (major, minor, PA): 0.043, 0.025, 59° remarks: * orbital elements for (623) Chimaera : Mean anomaly = 256.81077891 deg Arg. of pericenter = 123.87819579 deg Long. of node = 308.39940908 deg Inclination = 14.13508711 deg Eccentricity = 0.11279757 Semimajor axis = 2.46278510 AU Perihelion dist = 2.18498893 AU Mag: H = 10.78, G = 0.15 Epoch of elements : MJD 55053.45200000 TDT (2009 Aug 10.452) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 10 623 Chimaera 10h 50.5m UT 11.4 21 9 39.778-12 43 47.11TYC 5779-01326-1 11.6 14.1 44 3.5 1.542 -2.750 2.39 -164.2690 -12.731 18.71 15.45 10.8421 -0.01767 -0.29642 -7.05832 0.41988 0.00024 -0.00028 2000 255.9304702009 8 7.00000123.878196308.399409 14.1350870.11279757 2.4627851 2.184988911.0 5.00.15 RATE 2.5501420 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.032 65 1.93 0.037 0 54545.5020090810_1326-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org