IOTA/IOTA-ES occultation update for (258) Tyche / TYC 4920-00764-1 event on 2008 Apr 03, 16:52 UT Visible from N Australia, SE Asia, India, Russia Summary ------- On 2008 Apr 03 UT, the 65 km diameter asteroid (258) Tyche will occult a 10.9 mag star in the constellation Leo for observers along a path across N Australia, SE Asia, India, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 13.3 mag (the magnitude of the asteroid) for at most 4.8 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: 83 * date and approx. time of event: 2008 Apr 03, 16:44 - 2008 Apr 03, 16:59 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 4.8 * Moon: 8 % sunlit, 169° distance * Sun: 152° distance * rough path description: N Australia, SE Asia, India, Russia The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 0.63 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .025", 97° ) * approx speed of asteroid's shadow [km/s]: 13.3735 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4920-00764-1 by 258 Tyche on 2008 Apr 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude 29 0 0 64 43 1 16 59 12 11 130 0 65 6 34 64 19 33 65 36 23 63 50 7 30 0 0 64 24 55 16 59 11 12 131 -1 64 48 39 64 1 15 65 18 42 63 31 35 31 0 0 64 6 9 16 59 10 13 132 -1 64 30 6 63 42 18 65 0 24 63 12 23 32 0 0 63 46 44 16 59 9 13 133 -2 64 10 52 63 22 41 64 41 26 62 52 31 33 0 0 63 26 37 16 59 8 14 134 -2 63 50 58 63 2 23 64 21 47 62 31 58 34 0 0 63 5 49 16 59 7 14 135 -3 63 30 22 62 41 21 64 1 27 62 10 41 35 0 0 62 44 16 16 59 5 15 136 -4 63 9 2 62 19 37 63 40 23 61 48 41 36 0 0 62 21 59 16 59 4 15 136 -4 62 46 58 61 57 7 63 18 35 61 25 55 37 0 0 61 58 56 16 59 2 16 137 -5 62 24 7 61 33 50 62 56 2 61 2 23 38 0 0 61 35 5 16 59 1 17 138 -5 62 0 30 61 9 47 62 32 41 60 38 3 39 0 0 61 10 26 16 58 59 17 139 -6 61 36 4 60 44 54 62 8 32 60 12 54 40 0 0 60 44 56 16 58 57 18 140 -6 61 10 48 60 19 12 61 43 34 59 46 55 41 0 0 60 18 36 16 58 55 18 141 -7 60 44 41 59 52 37 61 17 44 59 20 5 42 0 0 59 51 22 16 58 53 19 142 -8 60 17 41 59 25 11 60 51 2 58 52 21 43 0 0 59 23 15 16 58 51 20 143 -8 59 49 48 58 56 50 60 23 26 58 23 43 44 0 0 58 54 12 16 58 49 21 144 -9 59 20 59 58 27 34 59 54 55 57 54 10 45 0 0 58 24 13 16 58 47 21 144 -10 58 51 13 57 57 21 59 25 27 57 23 40 46 0 0 57 53 16 16 58 44 22 145 -10 58 20 30 57 26 10 58 55 2 56 52 13 47 0 0 57 21 19 16 58 42 23 146 -11 57 48 47 56 54 0 58 23 37 56 19 46 48 0 0 56 48 22 16 58 39 23 147 -12 57 16 4 56 20 49 57 51 11 55 46 19 49 0 0 56 14 24 16 58 36 24 148 -13 56 42 19 55 46 37 57 17 44 55 11 50 50 0 0 55 39 22 16 58 33 25 149 -13 56 7 31 55 11 23 56 43 13 54 36 19 51 0 0 55 3 17 16 58 30 26 150 -14 55 31 39 54 35 5 56 7 38 53 59 45 52 0 0 54 26 7 16 58 26 27 151 -15 54 54 43 53 57 42 55 30 58 53 22 6 53 0 0 53 47 51 16 58 23 27 152 -16 54 16 40 53 19 13 54 53 12 52 43 23 54 0 0 53 8 29 16 58 19 28 153 -17 53 37 30 52 39 39 54 14 18 52 3 33 55 0 0 52 28 0 16 58 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28 20 272 -46 -19 52 22 -20 31 40 -19 27 29 -20 56 19 153 0 0 -20 22 37 16 45 25 19 271 -45 -20 2 59 -20 42 12 -19 38 10 -21 6 48 154 0 0 -20 32 25 16 45 22 18 271 -44 -20 12 49 -20 51 57 -19 48 4 -21 16 30 155 0 0 -20 41 26 16 45 19 17 271 -43 -20 21 53 -21 0 56 -19 57 10 -21 25 26 156 0 0 -20 49 40 16 45 17 16 270 -42 -20 30 9 -21 9 8 -20 5 30 -21 33 35 157 0 0 -20 57 8 16 45 15 15 270 -42 -20 37 39 -21 16 34 -20 13 2 -21 40 59 158 0 0 -21 3 50 16 45 13 14 270 -41 -20 44 23 -21 23 14 -20 19 48 -21 47 37 159 0 0 -21 9 46 16 45 10 13 269 -40 -20 50 20 -21 29 9 -20 25 47 -21 53 30 160 0 0 -21 14 55 16 45 9 12 269 -39 -20 55 31 -21 34 17 -20 30 59 -21 58 36 161 0 0 -21 19 19 16 45 7 11 269 -38 -20 59 55 -21 38 40 -20 35 25 -22 2 58 162 0 0 -21 22 57 16 45 5 11 268 -37 -21 3 34 -21 42 17 -20 39 5 -22 6 34 163 0 0 -21 25 49 16 45 4 10 268 -36 -21 6 27 -21 45 8 -20 41 58 -22 9 24 164 0 0 -21 27 55 16 45 2 9 268 -35 -21 8 33 -21 47 14 -20 44 5 -22 11 29 165 0 0 -21 29 15 16 45 1 8 267 -34 -21 9 54 -21 48 34 -20 45 26 -22 12 49 166 0 0 -21 29 50 16 45 0 7 267 -33 -21 10 28 -21 49 8 -20 46 0 -22 13 24 167 0 0 -21 29 38 16 44 59 6 267 -32 -21 10 16 -21 48 57 -20 45 48 -22 13 13 168 0 0 -21 28 40 16 44 58 5 266 -31 -21 9 18 -21 48 0 -20 44 49 -22 12 16 169 0 0 -21 26 57 16 44 58 4 266 -30 -21 7 34 -21 46 17 -20 43 4 -22 10 34 170 0 0 -21 24 27 16 44 57 3 266 -30 -21 5 3 -21 43 48 -20 40 32 -22 8 6 171 0 0 -21 21 10 16 44 57 2 265 -29 -21 1 45 -21 40 32 -20 37 12 -22 4 52 172 0 0 -21 17 7 16 44 56 1 265 -28 -20 57 41 -21 36 31 -20 33 6 -22 0 52 173 0 0 -21 12 17 16 44 56 0 265 -27 -20 52 49 -21 31 42 -20 28 13 -21 56 6 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 4920-00764-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 59 26.0746 DE: -05 10 36.155 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.9 * B mag [mag]: 11.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (258) Tyche approx. diameter [km]: 65 approx. diameter ["]: .040 distance from Earth [AU]: 2.22700 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 790 number of rejected observations: 116 time covered by the observations: 1900 Oct 29 - 2008 Mar 26 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.015, 106° remarks: * orbital elements for (258) Tyche : Mean anomaly = 169.35703067 deg Arg. of pericenter = 154.88953735 deg Long. of node = 207.68575693 deg Inclination = 14.29431494 deg Eccentricity = 0.20546108 Semimajor axis = 2.61433096 AU Perihelion dist = 2.07718771 AU Mag: H = 8.36, G = 0.23 Epoch of elements : MJD 54559.70300000 TDT (2008 Apr 03.703) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 3 258 Tyche 16h 52.2m UT 10.9 10 59 26.075- 5 10 36.16TYC 4920-00764-1 11.6 13.3 65 4.8 2.227 -1.394 21.31 79.4267 -5.182 -72.26 5.64 16.8695 0.29628 0.29008 -5.27715 5.39723 0.00274 -0.00010 2000 167.0946322008 325.00000154.889537207.685757 14.2943150.20546108 2.6143310 2.0771877 8.5 5.00.23 RATE 2.3316490 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.025 97 1.63 0.026 0 54553.5020080403_0764-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org