IOTA/IOTA-ES occultation update for (1157) Arabia / HIP 116660 event on 2009 Sep 09, 21:15 UT Visible from Summary ------- On 2009 Sep 09 UT, the 33 km diameter asteroid (1157) Arabia will occult a 8.7 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 14.1 mag (the magnitude of the asteroid) for at most 2.7 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: . The event at a glimpse ---------------------- * Rank: 47 * date and approx. time of event: 2009 Sep 09, 21:09 - 2009 Sep 09, 21:21 UT * magnitude of target star: 8.7 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 2.7 * Moon: 74 % sunlit, 52° distance * Sun: 170° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 47 * 1 sigma uncertainty interval [path widths]: +/- 1.39 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .057 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .032", 69° ) * approx speed of asteroid's shadow [km/s]: 12.0385 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 116660 by 1157 Arabia on 2009 Sep 9 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 - 46 0 0 36 22 26 21 21 36 0 87 -1 36 35 7 36 9 48 37 10 38 .. .. .. - 45 0 0 36 25 2 21 21 36 1 88 -2 36 37 43 36 12 23 37 13 14 .. .. .. - 44 0 0 36 27 48 21 21 35 2 89 -3 36 40 29 36 15 10 37 16 1 .. .. .. - 43 0 0 36 30 46 21 21 35 3 89 -4 36 43 27 36 18 7 37 18 59 .. .. .. - 42 0 0 36 33 54 21 21 34 4 90 -4 36 46 35 36 21 15 37 22 7 .. .. .. - 41 0 0 36 37 12 21 21 34 4 90 -5 36 49 54 36 24 34 37 25 26 .. .. .. - 40 0 0 36 40 42 21 21 33 5 91 -6 36 53 23 36 28 3 37 28 56 35 53 7 - 39 0 0 36 44 21 21 21 32 6 92 -7 36 57 3 36 31 42 37 32 36 35 56 46 - 38 0 0 36 48 11 21 21 31 7 92 -7 37 0 53 36 35 32 37 36 27 36 0 36 - 37 0 0 36 52 11 21 21 29 8 93 -8 37 4 53 36 39 32 37 40 27 36 4 35 - 36 0 0 36 56 21 21 21 28 8 93 -9 37 9 4 36 43 42 37 44 38 36 8 45 - 35 0 0 37 0 42 21 21 26 9 94 -10 37 13 24 36 48 2 37 48 59 36 13 4 - 34 0 0 37 5 12 21 21 25 10 95 -10 37 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123 0 0 54 19 54 21 9 22 11 259 -1 54 32 34 54 7 18 55 7 59 53 32 29 124 0 0 54 19 56 21 9 20 10 260 -1 54 32 36 54 7 20 55 8 2 53 32 31 Uncertainty in time = +/- 7 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 116660 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 38 27.1470 DE: +02 15 01.642 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .036, .023 ) * V mag [mag]: 8.7 * B mag [mag]: 9.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1157) Arabia approx. diameter [km]: 33 approx. diameter ["]: .024 distance from Earth [AU]: 1.92500 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 803 number of rejected observations: 62 time covered by the observations: 1929 Sep 26 - 2007 May 21 1 sigma uncertainty ellipse (major, minor, PA): 0.049, 0.022, 58° remarks: * orbital elements for (1157) Arabia : Mean anomaly = 48.42577227 deg Arg. of pericenter = 314.59546251 deg Long. of node = 336.22270892 deg Inclination = 9.54807736 deg Eccentricity = 0.14442503 Semimajor axis = 3.18454172 AU Perihelion dist = 2.72461419 AU Mag: H = 9.88, G = 0.15 Epoch of elements : MJD 55083.88600000 TDT (2009 Sep 09.886) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 9 1157 Arabia 21h 15.4m UT 8.7 23 38 27.147 2 15 1.64HIP 116660 9.3 14.1 33 2.7 1.925 -2.047 -4.75 46.7229 2.253 -139.55 5.01 21.2560 -0.10785 0.69802 -6.71501 -1.03875 -0.00066 -0.00074 2000 47.7518082009 9 6.00000314.595463336.222709 9.5480770.14442503 3.1845417 2.724614210.0 5.00.15 RATE 1.7343380 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.032 69 2.39 0.033 0 54786.5020090909_116660 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 16:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org