IOTA/IOTA-ES occultation update for (774) Armor / UCAC2 24372300 event on 2007 Aug 03, 14:46 UT Visible from Australia Summary ------- On 2007 Aug 03 UT, the 50 km diameter asteroid (774) Armor will occult a 11.2 mag star in the constellation Scorpius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.1 mag (the magnitude of the asteroid) for at most 7.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 62 * date and approx. time of event: 2007 Aug 03, 14:32 - 2007 Aug 03, 15:01 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 7.2 * Moon: 75 % sunlit, 126° distance * Sun: 114° distance * rough path description: Australia Additional comments ------------------- 3" double star? The occultation path -------------------- * approximate projected width [km]: 52 * 1 sigma uncertainty interval [path widths]: +/- 0.99 * 1 sigma uncertainty interval [seconds]: +/- 6.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .033", 0° ) * approx speed of asteroid's shadow [km/s]: 6.9456 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 24372300 by 774 Armor on 2007 Aug 03 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 - 22 0 0 -15 37 16 14 32 7 0 110 54 -15 52 26 -15 22 7 -16 22 32 .. .. .. - 21 0 0 -15 58 20 14 32 7 1 110 53 -16 13 31 -15 43 11 -16 43 37 .. .. .. - 20 0 0 -16 19 26 14 32 8 2 109 53 -16 34 37 -16 4 17 -17 4 44 .. .. .. - 19 0 0 -16 40 34 14 32 9 3 109 52 -16 55 44 -16 25 24 -17 25 52 -15 55 27 - 18 0 0 -17 1 41 14 32 10 4 109 51 -17 16 53 -16 46 32 -17 47 1 -16 16 34 - 17 0 0 -17 22 49 14 32 11 5 108 50 -17 38 1 -17 7 40 -18 8 9 -16 37 42 - 16 0 0 -17 43 57 14 32 13 6 108 49 -17 59 9 -17 28 47 -18 29 17 -16 58 49 - 15 0 0 -18 5 4 14 32 15 7 108 49 -18 20 16 -17 49 54 -18 50 24 -17 19 56 - 14 0 0 -18 26 10 14 32 18 8 107 48 -18 41 21 -18 10 59 -19 11 30 -17 41 1 - 13 0 0 -18 47 13 14 32 20 9 107 47 -19 2 25 -18 32 3 -19 32 33 -18 2 5 - 12 0 0 -19 8 14 14 32 23 10 107 46 -19 23 26 -18 53 4 -19 53 35 -18 23 6 - 11 0 0 -19 29 13 14 32 26 11 106 45 -19 44 24 -19 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Data for the target star ------------------------ * name: UCAC2 24372300 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 11 59.2637 DE: -19 06 53.512 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .033 ) * V mag [mag]: 11.2 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (774) Armor approx. diameter [km]: 50 approx. diameter ["]: .035 distance from Earth [AU]: 1.94500 * orbital information: orbit source: Preston date of fit: 2007 Jul 28 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 695 number of rejected observations: 105 time covered by the observations: 1908 Dec 16 - 2007 Jul 03 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.012, 93° remarks: * orbital elements for (774) Armor : Mean anomaly = 350.77016664 deg Arg. of pericenter = 29.07931428 deg Long. of node = 250.34219229 deg Inclination = 5.56444935 deg Eccentricity = 0.17234270 Semimajor axis = 3.04611864 AU Perihelion dist = 2.52114232 AU Mag: H = 8.67, G = 0.15 Epoch of elements : MJD 54315.61600000 TDT (2007 Aug 03.616) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 03 774 Armor 14h 46.8m UT 11.2 16 11 59.264-19 6 53.51UCAC2 24372300 0.0 13.1 50 7.2 1.945 1.251 -0.10 69.501 -19.115 -40.14 17.50 14.7795 -.00223 -.28676 3.92022 -0.02032 0.00488 -0.00098 2000 349.7290222007 729.00000 29.079314250.342192 5.5644490.172342703.046118642.521142328.6 5 0.15 RATE 1.8538900 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.035 0.033 0.4 1.990 0.035 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 29, 02:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org