IOTA/IOTA-ES occultation update for (31402) 1999 AR / HIP 72712 event on 2008 Jul 11, 20:41 UT Visible from Africa, Antarctica Summary ------- On 2008 Jul 11 UT, the 11 km diameter asteroid (31402) 1999 AR will occult a 8.2 mag star in the constellation Centaurus for observers along a path across Africa, Antarctica. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.6 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.1 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: 5 * date and approx. time of event: 2008 Jul 11, 20:32 - 2008 Jul 11, 20:50 UT * magnitude of target star: 8.2 * magnitude drop [mag]: 7.6 * estimated maximum duration [s]: 1.1 * Moon: 66 % sunlit, 19° distance * Sun: 120° distance * rough path description: Africa, Antarctica The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 11.63 * 1 sigma uncertainty interval [seconds]: +/- 9.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .149 +/- .073) * 1 sigma uncertainty ellipse (major, minor, PA): ( .153", .064", 105° ) * approx speed of asteroid's shadow [km/s]: 10.4218 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 72712 by 31402 1999 AR on 2008 Jul 11 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 ' " Longitude Longitude Longitude Longitude 52 22 55 22 0 0 20 50 24 0 230 -46 52 28 5 52 17 45 ... .. .. ... .. .. 51 8 50 21 0 0 20 50 24 2 229 -47 51 13 52 51 3 47 53 13 3 ... .. .. 49 57 34 20 0 0 20 50 23 3 229 -48 50 2 30 49 52 39 51 58 46 ... .. .. 48 48 55 19 0 0 20 50 22 5 228 -49 48 53 44 48 44 6 50 47 21 46 53 35 47 42 39 18 0 0 20 50 20 6 228 -50 47 47 22 47 37 56 49 38 34 45 49 36 46 38 35 17 0 0 20 50 18 8 228 -51 46 43 13 46 33 58 48 32 12 44 47 38 45 36 33 16 0 0 20 50 16 9 228 -52 45 41 6 45 32 1 47 28 3 43 47 31 44 36 25 15 0 0 20 50 13 11 227 -53 44 40 53 44 31 57 46 25 58 42 49 9 43 38 1 14 0 0 20 50 10 12 227 -54 43 42 25 43 33 37 45 25 47 41 52 24 42 41 15 13 0 0 20 50 7 13 227 -55 42 45 35 42 36 56 44 27 23 40 57 9 41 46 1 12 0 0 20 50 3 15 227 -55 41 50 17 41 41 45 43 30 37 40 3 18 40 52 11 11 0 0 20 50 0 16 227 -56 40 56 24 40 47 58 42 35 24 39 10 46 39 59 41 10 0 0 20 49 55 17 226 -57 40 3 51 39 55 32 41 41 36 38 19 28 39 8 26 9 0 0 20 49 51 19 226 -58 39 12 33 39 4 19 40 49 9 37 29 18 38 18 20 8 0 0 20 49 46 20 226 -58 38 22 24 38 14 15 39 57 57 36 40 13 37 29 19 7 0 0 20 49 41 21 226 -59 37 33 21 37 25 17 39 7 55 35 52 8 36 41 19 6 0 0 20 49 36 23 226 -60 36 45 19 36 37 19 38 19 0 35 5 0 35 54 17 5 0 0 20 49 30 24 226 -60 35 58 15 35 50 19 37 31 6 34 18 45 35 8 8 4 0 0 20 49 24 25 226 -61 35 12 4 35 4 12 36 44 10 33 33 19 34 22 49 3 0 0 20 49 18 26 226 -61 34 26 44 34 18 55 35 58 8 32 48 40 33 38 18 2 0 0 20 49 12 28 226 -62 33 42 11 33 34 25 35 12 58 32 4 45 32 54 31 1 0 0 20 49 5 29 226 -62 32 58 22 32 50 39 34 28 35 31 21 30 32 11 25 0 0 0 20 48 58 30 226 -63 32 15 15 32 7 35 33 44 57 30 38 53 31 28 57 - 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99 0 0 -69 41 26 20 32 55 36 99 -4 -69 44 45 -69 38 7 -71 2 15 -68 21 11 -100 0 0 -69 32 59 20 32 52 36 100 -3 -69 36 20 -69 29 39 -70 54 18 -68 12 15 -101 0 0 -69 24 8 20 32 50 35 101 -3 -69 27 29 -69 20 46 -70 45 57 -68 2 53 -102 0 0 -69 14 50 20 32 47 35 102 -3 -69 18 13 -69 11 27 -70 37 12 -67 53 4 -103 0 0 -69 5 6 20 32 45 35 103 -3 -69 8 30 -69 1 42 -70 28 1 -67 42 47 -104 0 0 -68 54 55 20 32 42 34 104 -2 -68 58 20 -68 51 29 -70 18 25 -67 32 1 -105 0 0 -68 44 15 20 32 40 34 105 -2 -68 47 42 -68 40 48 -70 8 22 -67 20 46 -106 0 0 -68 33 7 20 32 37 33 106 -2 -68 36 35 -68 29 38 -69 57 51 -67 9 1 -107 0 0 -68 21 28 20 32 34 33 107 -1 -68 24 59 -68 17 58 -69 46 52 -66 56 44 -108 0 0 -68 9 19 20 32 32 32 108 -1 -68 12 51 -68 5 47 -69 35 24 -66 43 54 -109 0 0 -67 56 38 20 32 29 32 109 -1 -68 0 12 -67 53 5 -69 23 26 -66 30 32 -110 0 0 -67 43 25 20 32 27 32 110 0 -67 47 0 -67 39 49 -69 10 57 -66 16 35 -111 0 0 -67 29 37 20 32 24 31 111 0 -67 33 15 -67 26 0 -68 57 55 -66 2 3 Uncertainty in time = +/- 15 secs [Prediction of 2008 Jul 2.0] Data for the target star ------------------------ * name: HIP 72712 * constellation : Centaurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 51 58.4687 DE: -36 37 37.833 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .019, .025 ) * V mag [mag]: 8.2 * B mag [mag]: 9.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (31402) 1999 AR approx. diameter [km]: 11 approx. diameter ["]: .011 distance from Earth [AU]: 1.37900 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 492 number of rejected observations: 6 time covered by the observations: 1989 Sep 03 - 2008 Jun 08 1 sigma uncertainty ellipse (major, minor, PA): 0.152, 0.059, 105° remarks: * orbital elements for (31402) 1999 AR : Mean anomaly = 357.33867288 deg Arg. of pericenter = 313.57013653 deg Long. of node = 305.87584216 deg Inclination = 16.49523783 deg Eccentricity = 0.17934074 Semimajor axis = 2.53473365 AU Perihelion dist = 2.08015264 AU Mag: H = 12.58, G = 0.15 Epoch of elements : MJD 54658.86200000 TDT (2008 Jul 11.862) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 11 31402 1999 AR 20h 40.6m UT 8.2 14 51 58.469-36 37 37.83HIP 72712 9.5 15.8 11 1.1 1.379 2.233 26.17 -17.2846 -36.635 -128.75 21.96 20.6768 0.19435 -0.20019 4.21276 4.10544 0.00444 -0.00051 2000 355.1742742008 7 3.00000313.570137305.875842 16.4952380.17934074 2.5347337 2.080152612.4 5.00.15 RATE 2.4423370 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.153 0.064 105 12.63 0.128 0 54649.5020080711__72712 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 02, 19:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org