IOTA/IOTA-ES occultation update for (4449) Sobinov / TYC 6818-00711-1 event on 2008 Jul 03, 14:03 UT Visible from Philippines, S China Summary ------- On 2008 Jul 03 UT, the 30 km diameter asteroid (4449) Sobinov will occult a 10.3 mag star in the constellation Ophiuchus for observers along a path across Philippines, S China. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 15.5 mag (the magnitude of the asteroid) for at most 3.6 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: 23 * date and approx. time of event: 2008 Jul 03, 13:53 - 2008 Jul 03, 14:11 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 3.6 * Moon: 0 % sunlit, 147° distance * Sun: 154° distance * rough path description: Philippines, S China The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 2.96 * 1 sigma uncertainty interval [seconds]: +/- 15.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .105 +/- .061) * 1 sigma uncertainty ellipse (major, minor, PA): ( .105", .061", 93° ) * approx speed of asteroid's shadow [km/s]: 8.4280 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6818-00711-1 by 4449 Sobinov on 2008 Jul 3 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 82 0 0 42 11 0 14 11 51 13 146 -1 42 26 20 41 55 46 43 58 54 40 27 9 83 0 0 41 27 27 14 11 47 14 147 -2 41 42 42 41 12 17 43 14 49 39 44 5 84 0 0 40 43 51 14 11 42 15 148 -3 40 59 2 40 28 45 42 30 40 39 0 58 85 0 0 40 0 14 14 11 38 16 148 -4 40 15 20 39 45 13 41 46 29 38 17 52 86 0 0 39 16 39 14 11 32 17 149 -5 39 31 40 39 1 42 41 2 18 37 34 49 87 0 0 38 33 6 14 11 27 18 150 -6 38 48 3 38 18 15 40 18 9 36 51 50 88 0 0 37 49 40 14 11 21 19 150 -7 38 4 31 37 34 53 39 34 5 36 8 56 89 0 0 37 6 20 14 11 15 20 151 -8 37 21 6 36 51 39 38 50 7 35 26 11 90 0 0 36 23 10 14 11 8 21 152 -9 36 37 50 36 8 34 38 6 18 34 43 36 91 0 0 35 40 10 14 11 2 22 152 -10 35 54 45 35 25 40 37 22 39 34 1 12 92 0 0 34 57 24 14 10 55 23 153 -11 35 11 53 34 42 59 36 39 12 33 19 2 93 0 0 34 14 52 14 10 47 24 154 -12 34 29 16 34 0 32 35 56 0 32 37 6 94 0 0 33 32 36 14 10 39 25 155 -14 33 46 54 33 18 22 35 13 4 31 55 27 95 0 0 32 50 38 14 10 31 26 155 -15 33 4 51 32 36 30 34 30 25 31 14 6 96 0 0 32 9 0 14 10 23 27 156 -16 32 23 7 31 54 57 33 48 6 30 33 4 97 0 0 31 27 42 14 10 15 28 157 -17 31 41 43 31 13 45 33 6 8 29 52 24 98 0 0 30 46 47 14 10 6 29 158 -18 31 0 42 30 32 55 32 24 32 29 12 5 99 0 0 30 6 15 14 9 57 30 158 -19 30 20 5 29 52 28 31 43 19 28 32 10 100 0 0 29 26 8 14 9 47 31 159 -20 29 39 52 29 12 27 31 2 32 27 52 40 101 0 0 28 46 27 14 9 38 32 160 -21 29 0 6 28 32 52 30 22 11 27 13 36 102 0 0 28 7 13 14 9 28 32 161 -22 28 20 47 27 53 44 29 42 18 26 34 59 103 0 0 27 28 28 14 9 18 33 162 -23 27 41 56 27 15 4 29 2 53 25 56 49 104 0 0 26 50 12 14 9 7 34 163 -24 27 3 35 26 36 53 28 23 58 25 19 9 105 0 0 26 12 27 14 8 57 35 163 -25 26 25 44 25 59 13 27 45 34 24 41 59 106 0 0 25 35 12 14 8 46 36 164 -26 25 48 24 25 22 4 27 7 41 24 5 19 107 0 0 24 58 30 14 8 35 37 165 -27 25 11 36 24 45 26 26 30 21 23 29 11 108 0 0 24 22 20 14 8 24 38 166 -28 24 35 21 24 9 22 25 53 34 22 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Uncertainty in time = +/- 17 secs [Prediction of 2008 Jun 19.0] Data for the target star ------------------------ * name: TYC 6818-00711-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 56 58.9019 DE: -26 49 29.089 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .022 ) * V mag [mag]: 10.3 * B mag [mag]: 10.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4449) Sobinov approx. diameter [km]: 30 approx. diameter ["]: .022 distance from Earth [AU]: 1.91300 * orbital information: orbit source: Preston date of fit: 2008 Jun 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 759 number of rejected observations: 8 time covered by the observations: 1954 Oct 24 - 2008 May 30 1 sigma uncertainty ellipse (major, minor, PA): 0.100, 0.057, 93° remarks: * orbital elements for (4449) Sobinov : Mean anomaly = 9.36990405 deg Arg. of pericenter = 314.22178455 deg Long. of node = 299.27750769 deg Inclination = 4.90462359 deg Eccentricity = 0.09188488 Semimajor axis = 3.14526478 AU Perihelion dist = 2.85626249 AU Mag: H = 11.50, G = 0.15 Epoch of elements : MJD 54650.58600000 TDT (2008 Jul 03.586) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 3 4449 Sobinov 14h 2.8m UT 10.3 16 56 58.902-26 49 29.09TYC 6818-00711-1 10.7 15.5 30 3.6 1.913 -1.533 7.52 121.5857 -26.826 -29.61 22.90 14.0461 0.22496 0.61442 -4.46695 1.63573 0.00248 0.00009 2000 9.2663622008 7 3.00000314.221785299.277508 4.9046240.09188488 3.1452648 2.856262511.2 5.00.15 RATE 1.7669260 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.105 0.061 93 3.96 0.064 0 54636.5020080703_0711-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 19, 01:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org