IOTA/IOTA-ES occultation update for (344) Desiderata / TYC 0637-01168-1 event on 2009 Dec 05, 18:20 UT Visible from Summary ------- On 2009 Dec 05 UT, the 127 km diameter asteroid (344) Desiderata will occult a 11.9 mag star in the constellation Aries for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 12.5 mag (the magnitude of the asteroid) for at most 13.6 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: 93 * date and approx. time of event: 2009 Dec 05, 18:10 - 2009 Dec 05, 18:30 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 13.6 * Moon: 83 % sunlit, 85° distance * Sun: 143° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 139 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 6.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .042) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .040", 357° ) * approx speed of asteroid's shadow [km/s]: 9.2803 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0637-01168-1 by 344 Desiderata on 2009 Dec 5 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 - 31 0 0 42 14 21 18 30 32 22 91 -1 42 52 36 41 36 17 43 28 44 41 0 41 - 30 0 0 42 21 34 18 30 28 23 92 -1 42 59 47 41 43 33 43 35 54 41 7 58 - 29 0 0 42 28 31 18 30 25 23 92 -2 43 6 43 41 50 32 43 42 47 41 14 59 - 28 0 0 42 35 12 18 30 21 24 93 -3 43 13 22 41 57 14 43 49 25 41 21 43 - 27 0 0 42 41 37 18 30 17 25 94 -3 43 19 45 42 3 41 43 55 46 41 28 11 - 26 0 0 42 47 46 18 30 13 26 95 -4 43 25 52 42 9 51 44 1 51 41 34 23 - 25 0 0 42 53 38 18 30 8 26 95 -5 43 31 42 42 15 45 44 7 41 41 40 18 - 24 0 0 42 59 14 18 30 4 27 96 -5 43 37 17 42 21 22 44 13 14 41 45 57 - 23 0 0 43 4 34 18 30 0 28 97 -6 43 42 35 42 26 44 44 18 31 41 51 20 - 22 0 0 43 9 38 18 29 55 28 98 -7 43 47 38 42 31 49 44 23 32 41 56 26 - 21 0 0 43 14 25 18 29 51 29 98 -7 43 52 24 42 36 38 44 28 17 42 1 16 - 20 0 0 43 18 57 18 29 46 30 99 -8 43 56 55 42 41 11 44 32 46 42 5 50 - 19 0 0 43 23 13 18 29 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Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0637-01168-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 15 26.2634 DE: +13 42 47.106 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .040 ) * V mag [mag]: 11.9 * B mag [mag]: 12.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (344) Desiderata approx. diameter [km]: 127 approx. diameter ["]: .089 distance from Earth [AU]: 1.97100 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 744 number of rejected observations: 67 time covered by the observations: 1909 Dec 16 - 2008 Feb 06 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.012, 54° remarks: * orbital elements for (344) Desiderata : Mean anomaly = 88.45434744 deg Arg. of pericenter = 237.39028692 deg Long. of node = 48.21691333 deg Inclination = 18.35597660 deg Eccentricity = 0.31632109 Semimajor axis = 2.59362462 AU Perihelion dist = 1.77320646 AU Mag: H = 8.20, G = 0.15 Epoch of elements : MJD 55170.76400000 TDT (2009 Dec 05.764) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 5 344 Desiderata 18h 21.0m UT 11.9 2 15 26.263 13 42 47.11TYC 0637-01168-1 12.7 12.5 127 13.6 1.971 -1.557 5.52 43.9152 13.712 -97.56 -22.45 18.3508 0.09686 0.40145 -5.08995 1.23674 0.00337 0.00117 2000 88.274071200912 5.00000237.390287 48.216913 18.3559770.31632109 2.5936246 1.7732065 8.1 5.00.15 RATE 2.3596280 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.040 357 1.47 0.041 0 54545.5020091205_1168-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 17:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org