IOTA/IOTA-ES occultation update for (2729) Urumqi / HIP 113031 event on 2008 Jul 06, 02:07 UT Visible from Antarctica, Brazil Summary ------- On 2008 Jul 06 UT, the 19 km diameter asteroid (2729) Urumqi will occult a 5.8 mag star in the constellation Aquarius for observers along a path across Antarctica, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 10.2 mag to 16.0 mag (the magnitude of the asteroid) for at most 8.8 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: 10 * date and approx. time of event: 2008 Jul 06, 01:33 - 2008 Jul 06, 02:45 UT * midpoint of event [JD]: 2454653.58984583 * magnitude of target star: 5.8 * magnitude drop [mag]: 10.2 * estimated maximum duration [s]: 8.8 * Moon: 12 % sunlit, 164° distance * Sun: 124° distance * rough path description: Antarctica, Brazil Additional comments ------------------- close double system, A is spectroscopic binary The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 6.69 * 1 sigma uncertainty interval [seconds]: +/- 59.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .104 +/- .071) * 1 sigma uncertainty ellipse (major, minor, PA): ( .108", .065", 72° ) * approx speed of asteroid's shadow [km/s]: 2.1506 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 113031 by 2729 Urumqi on 2008 Jul 6 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 - 58 0 0 -18 10 14 1 33 13 0 102 -56 -18 17 38 -18 2 51 -19 58 14 .. .. .. - 57 0 0 -18 23 0 1 33 14 1 102 -57 -18 30 26 -18 15 36 -20 11 27 .. .. .. - 56 0 0 -18 36 27 1 33 16 2 102 -58 -18 43 54 -18 29 0 -20 25 21 .. .. .. - 55 0 0 -18 50 33 1 33 19 3 101 -59 -18 58 3 -18 43 5 -20 39 57 .. .. .. - 54 0 0 -19 5 21 1 33 23 4 101 -60 -19 12 53 -18 57 51 -20 55 15 .. .. .. - 53 0 0 -19 20 51 1 33 29 5 101 -61 -19 28 24 -19 13 18 -21 11 16 .. .. .. - 52 0 0 -19 37 2 1 33 36 6 100 -62 -19 44 38 -19 29 27 -21 28 0 .. .. .. - 51 0 0 -19 53 56 1 33 44 7 100 -63 -20 1 34 -19 46 19 -21 45 28 .. .. .. - 50 0 0 -20 11 32 1 33 53 8 99 -64 -20 19 13 -20 3 53 -22 3 39 .. .. .. - 49 0 0 -20 29 52 1 34 4 9 99 -65 -20 37 35 -20 22 10 -22 22 35 .. .. .. - 48 0 0 -20 48 55 1 34 16 10 99 -66 -20 56 41 -20 41 11 -22 42 16 -18 59 21 - 47 0 0 -21 8 43 1 34 29 11 98 -67 -21 16 31 -21 0 56 -23 2 42 -19 18 33 - 46 0 0 -21 29 15 1 34 44 12 98 -68 -21 37 5 -21 21 25 -23 23 54 -19 38 29 - 45 0 0 -21 50 31 1 35 0 13 97 -69 -21 58 24 -21 42 39 -23 45 52 -19 59 8 - 44 0 0 -22 12 33 1 35 18 14 97 -70 -22 20 29 -22 4 38 -24 8 36 -20 20 31 - 43 0 0 -22 35 20 1 35 37 15 96 -71 -22 43 19 -22 27 22 -24 32 7 -20 42 39 - 42 0 0 -22 58 52 1 35 57 16 96 -72 -23 6 54 -22 50 52 -24 56 24 -21 5 31 - 41 0 0 -23 23 11 1 36 19 17 95 -73 -23 31 16 -23 15 7 -25 21 28 -21 29 7 - 40 0 0 -23 48 15 1 36 43 18 95 -74 -23 56 23 -23 40 9 -25 47 20 -21 53 29 - 39 0 0 -24 14 6 1 37 8 19 94 -75 -24 22 17 -24 5 56 -26 13 59 -22 18 36 - 38 0 0 -24 40 43 1 37 34 20 94 -76 -24 48 57 -24 32 29 -26 41 24 -22 44 28 - 37 0 0 -25 8 6 1 38 2 21 93 -77 -25 16 23 -24 59 49 -27 9 37 -23 11 6 - 36 0 0 -25 36 15 1 38 32 22 92 -78 -25 44 36 -25 27 55 -27 38 38 -23 38 28 - 35 0 0 -26 5 9 1 39 2 23 92 -79 -26 13 34 -25 56 46 -28 8 24 -24 6 36 - 34 0 0 -26 34 50 1 39 35 25 91 -80 -26 43 18 -26 26 23 -28 38 58 -24 35 29 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116 0 0 -67 54 52 2 44 57 8 258 -2 -68 2 24 -67 47 21 -69 44 49 .. .. .. 117 0 0 -67 46 46 2 45 1 7 257 -2 -67 54 20 -67 39 13 -69 37 11 .. .. .. 118 0 0 -67 38 22 2 45 4 7 256 -2 -67 45 59 -67 30 47 -69 29 16 .. .. .. 119 0 0 -67 29 40 2 45 8 6 255 -1 -67 37 19 -67 22 3 -69 21 3 .. .. .. 120 0 0 -67 20 40 2 45 11 6 254 -1 -67 28 20 -67 13 1 -69 12 33 .. .. .. 121 0 0 -67 11 22 2 45 14 6 253 -1 -67 19 4 -67 3 40 -69 3 44 .. .. .. 122 0 0 -67 1 44 2 45 17 5 252 -1 -67 9 28 -66 54 1 -68 54 38 .. .. .. 123 0 0 -66 51 48 2 45 19 5 252 0 -66 59 34 -66 44 2 -68 45 13 .. .. .. 124 0 0 -66 41 32 2 45 22 4 251 0 -66 49 21 -66 33 45 -68 35 29 .. .. .. Uncertainty in time = +/- 72 secs [Prediction of 2008 May 26.0] Data for the target star ------------------------ * name: HIP 113031 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 53 28.7185 DE: -11 36 59.433 * position source: Pos: mpos:HIP pm:HIP plx:HIP, pm: , pi: * standard error: RA,DE ["]: ( .050, .050 ) * V mag [mag]: 5.8 * B mag [mag]: 5.7 * Apparent position with proper motion RA(deg): 343.4877246853 DE(deg): -11.5688646285 * Equation of equinoxes (radians) : 0.000052038610759 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2729) Urumqi approx. diameter [km]: 19 approx. diameter ["]: .013 distance from Earth [AU]: 1.98200 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 944 number of rejected observations: 18 time covered by the observations: 1975 Dec 04 - 2007 Oct 04 1 sigma uncertainty ellipse (major, minor, PA): 0.096, 0.043, 67° remarks: * orbital elements for (2729) Urumqi : Mean anomaly = 355.28565162 deg Arg. of pericenter = 263.15740473 deg Long. of node = 64.22344319 deg Inclination = 3.17084563 deg Eccentricity = 0.07036126 Semimajor axis = 2.88779672 AU Perihelion dist = 2.68460771 AU Mag: H = 11.50, G = 0.15 Epoch of elements : MJD 54653.08800000 TDT (2008 Jul 06.088) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 6 2729 Urumqi 2h 9.4m UT 5.8 22 53 28.718-11 36 59.43HIP 113031 5.7 16.0 19 8.8 1.982 0.333 -2.23 26.5883 -11.617 148.85 22.66 2.1563 -0.28066 -0.61750 1.10556 -0.50114 -0.00432 -0.00154 2000 354.6654522008 7 3.00000263.157405 64.223443 3.1708460.07036126 2.8877967 2.684607711.4 5.00.15 RATE 2.0084190 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.108 0.065 72 7.69 0.087 0 54612.5020080706_113031 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 16:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org