IOTA/IOTA-ES occultation update for (7778) Markrobinson / TYC 5108-00014-1 event on 2008 May 14, 21:23 UT Visible from W Australia, Indonesia Summary ------- On 2008 May 14 UT, the 11 km diameter asteroid (7778) Markrobinson will occult a 10.2 mag star in the constellation Ophiuchus for observers along a path across W Australia, Indonesia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 14.9 mag (the magnitude of the asteroid) for at most 1.0 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: 4 * date and approx. time of event: 2008 May 14, 21:16 - 2008 May 14, 21:28 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 1.0 * Moon: 77 % sunlit, 94° distance * Sun: 141° distance * rough path description: W Australia, Indonesia The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 16.35 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .242 +/- .094) * 1 sigma uncertainty ellipse (major, minor, PA): ( .249", .074", 76° ) * approx speed of asteroid's shadow [km/s]: 10.7684 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5108-00014-1 by 7778 Markrobinson on 2008 May 14 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 115 40 24 29 0 0 21 28 47 38 235 0 115 44 55 115 35 54 118 15 38 113 11 1 115 19 34 28 0 0 21 28 38 39 235 -1 115 24 1 115 15 7 117 52 22 112 52 20 115 0 13 27 0 0 21 28 30 39 236 -2 115 4 36 114 55 50 117 30 47 112 35 1 114 42 18 26 0 0 21 28 21 40 236 -2 114 46 38 114 37 59 117 10 46 112 19 0 114 25 45 25 0 0 21 28 12 41 236 -3 114 30 1 114 21 29 116 52 16 112 4 12 114 10 30 24 0 0 21 28 4 42 237 -4 114 14 43 114 6 17 116 35 12 111 50 36 113 56 29 23 0 0 21 27 55 43 237 -4 114 0 39 113 52 19 116 19 30 111 38 7 113 43 40 22 0 0 21 27 46 43 238 -5 113 47 48 113 39 32 116 5 7 111 26 44 113 32 0 21 0 0 21 27 37 44 239 -5 113 36 5 113 27 55 115 51 59 111 16 23 113 21 26 20 0 0 21 27 28 45 239 -6 113 25 29 113 17 23 115 40 4 111 7 4 113 11 56 19 0 0 21 27 18 45 240 -6 113 15 56 113 7 55 115 29 18 110 58 42 113 3 27 18 0 0 21 27 9 46 241 -7 113 7 26 112 59 29 115 19 41 110 51 18 112 55 59 17 0 0 21 27 0 47 242 -8 112 59 56 112 52 2 115 11 8 110 44 49 112 49 29 16 0 0 21 26 50 47 242 -8 112 53 25 112 45 34 115 3 39 110 39 13 112 43 56 15 0 0 21 26 40 48 243 -9 112 47 50 112 40 2 114 57 12 110 34 30 112 39 18 14 0 0 21 26 31 48 244 -9 112 43 10 112 35 26 114 51 45 110 30 38 112 35 34 13 0 0 21 26 21 49 245 -9 112 39 25 112 31 43 114 47 16 110 27 35 112 32 42 12 0 0 21 26 11 49 246 -10 112 36 32 112 28 53 114 43 44 110 25 21 112 30 43 11 0 0 21 26 2 50 247 -10 112 34 32 112 26 54 114 41 8 110 23 55 112 29 34 10 0 0 21 25 52 50 248 -11 112 33 22 112 25 46 114 39 28 110 23 16 112 29 16 9 0 0 21 25 42 51 249 -11 112 33 3 112 25 29 114 38 41 110 23 23 112 29 46 8 0 0 21 25 32 51 250 -12 112 33 33 112 26 0 114 38 48 110 24 17 112 31 6 7 0 0 21 25 22 51 251 -12 112 34 52 112 27 20 114 39 48 110 25 55 112 33 14 6 0 0 21 25 12 52 253 -12 112 37 0 112 29 29 114 41 40 110 28 18 112 36 11 5 0 0 21 25 2 52 254 -13 112 39 56 112 32 26 114 44 24 110 31 26 112 39 55 4 0 0 21 24 51 52 255 -13 112 43 40 112 36 10 114 48 0 110 35 19 112 44 27 3 0 0 21 24 41 52 256 -13 112 48 11 112 40 42 114 52 27 110 39 55 112 49 46 2 0 0 21 24 31 53 258 -14 112 53 31 112 46 1 114 57 45 110 45 15 112 55 53 1 0 0 21 24 21 53 259 -14 112 59 38 112 52 8 115 3 55 110 51 20 113 2 47 0 0 0 21 24 10 53 260 -14 113 6 32 112 59 3 115 10 56 110 58 9 113 10 30 - 1 0 0 21 24 0 53 262 -14 113 14 15 113 6 45 115 18 49 111 5 43 113 19 1 - 2 0 0 21 23 50 53 263 -15 113 22 47 113 15 15 115 27 34 111 14 1 113 28 21 - 3 0 0 21 23 40 53 264 -15 113 32 7 113 24 35 115 37 12 111 23 4 113 38 29 - 4 0 0 21 23 29 53 265 -15 113 42 16 113 34 43 115 47 43 111 32 53 113 49 28 - 5 0 0 21 23 19 53 267 -15 113 53 16 113 45 41 115 59 8 111 43 28 114 1 18 - 6 0 0 21 23 8 53 268 -15 114 5 6 113 57 30 116 11 28 111 54 50 114 13 59 - 7 0 0 21 22 58 53 269 -16 114 17 48 114 10 10 116 24 43 112 7 0 114 27 32 - 8 0 0 21 22 48 52 271 -16 114 31 23 114 23 42 116 38 56 112 19 58 114 41 59 - 9 0 0 21 22 37 52 272 -16 114 45 51 114 38 8 116 54 6 112 33 46 114 57 21 -10 0 0 21 22 27 52 273 -16 115 1 14 114 53 29 117 10 17 112 48 25 115 13 40 -11 0 0 21 22 17 52 274 -16 115 17 34 115 9 45 117 27 28 113 3 55 115 30 56 -12 0 0 21 22 6 51 275 -16 115 34 52 115 27 0 117 45 42 113 20 18 115 49 12 -13 0 0 21 21 56 51 277 -16 115 53 10 115 45 14 118 5 2 113 37 37 116 8 29 -14 0 0 21 21 46 51 278 -16 116 12 29 116 4 29 118 25 28 113 55 51 116 28 50 -15 0 0 21 21 35 50 279 -16 116 32 52 116 24 48 118 47 4 114 15 4 116 50 16 -16 0 0 21 21 25 50 280 -16 116 54 20 116 46 12 119 9 52 114 35 18 117 12 51 -17 0 0 21 21 15 49 281 -16 117 16 58 117 8 44 119 33 55 114 56 33 117 36 37 -18 0 0 21 21 4 49 282 -16 117 40 47 117 32 28 119 59 17 115 18 54 118 1 37 -19 0 0 21 20 54 48 283 -16 118 5 50 117 57 25 120 26 0 115 42 23 118 27 55 -20 0 0 21 20 44 47 283 -16 118 32 11 118 23 40 120 54 9 116 7 1 118 55 34 -21 0 0 21 20 34 47 284 -16 118 59 53 118 51 16 121 23 48 116 32 54 119 24 39 -22 0 0 21 20 24 46 285 -15 119 29 1 119 20 17 121 55 2 117 0 3 119 55 13 -23 0 0 21 20 14 46 286 -15 119 59 39 119 50 47 122 27 56 117 28 34 Latitude Latitude Latitude Latitude 120 0 0 -23 9 7 21 20 12 45 286 -15 -23 0 39 -23 17 33 -18 1 40 -27 37 8 121 0 0 -24 57 57 21 19 54 44 287 -15 -24 50 0 -25 5 52 -20 12 6 -29 11 23 122 0 0 -26 37 33 21 19 38 43 288 -14 -26 30 2 -26 45 2 -22 9 16 -30 38 32 123 0 0 -28 9 13 21 19 22 42 288 -14 -28 2 4 -28 16 21 -23 55 37 -31 59 27 124 0 0 -29 34 0 21 19 9 40 289 -14 -29 27 10 -29 40 49 -25 32 51 -33 14 48 125 0 0 -30 52 42 21 18 56 39 289 -13 -30 46 9 -30 59 14 -27 2 19 -34 25 9 126 0 0 -32 5 59 21 18 44 38 289 -13 -31 59 41 -32 12 17 -28 25 1 -35 31 0 127 0 0 -33 14 25 21 18 33 37 289 -12 -33 8 20 -33 20 30 -29 41 45 -36 32 44 128 0 0 -34 18 28 21 18 23 36 290 -12 -34 12 34 -34 24 20 -30 53 11 -37 30 44 129 0 0 -35 18 30 21 18 14 35 289 -11 -35 12 48 -35 24 12 -31 59 52 -38 25 18 130 0 0 -36 14 54 21 18 5 34 289 -11 -36 9 21 -36 20 26 -33 2 15 -39 16 41 131 0 0 -37 7 56 21 17 56 33 289 -10 -37 2 32 -37 13 20 -34 0 42 -40 5 7 132 0 0 -37 57 53 21 17 49 32 289 -10 -37 52 37 -38 3 8 -34 55 35 -40 50 51 133 0 0 -38 44 57 21 17 41 31 289 -9 -38 39 48 -38 50 5 -35 47 11 -41 34 2 134 0 0 -39 29 21 21 17 35 30 288 -9 -39 24 19 -39 34 22 -36 35 44 -42 14 50 135 0 0 -40 11 16 21 17 28 29 288 -8 -40 6 20 -40 16 11 -37 21 28 -42 53 25 136 0 0 -40 50 51 21 17 22 28 287 -8 -40 46 1 -40 55 40 -38 4 34 -43 29 55 137 0 0 -41 28 15 21 17 16 27 287 -7 -41 23 31 -41 32 58 -38 45 14 -44 4 27 138 0 0 -42 3 35 21 17 11 26 286 -7 -41 58 56 -42 8 14 -39 23 36 -44 37 7 139 0 0 -42 37 0 21 17 6 25 286 -6 -42 32 26 -42 41 34 -39 59 48 -45 8 2 140 0 0 -43 8 34 21 17 1 24 285 -6 -43 4 4 -43 13 4 -40 33 59 -45 37 17 141 0 0 -43 38 25 21 16 56 23 285 -5 -43 33 59 -43 42 50 -41 6 15 -46 4 57 142 0 0 -44 6 36 21 16 52 23 284 -5 -44 2 14 -44 10 58 -41 36 41 -46 31 7 143 0 0 -44 33 13 21 16 48 22 284 -4 -44 28 55 -44 37 31 -42 5 24 -46 55 51 144 0 0 -44 58 21 21 16 44 21 283 -4 -44 54 5 -45 2 35 -42 32 29 -47 19 12 145 0 0 -45 22 2 21 16 41 20 283 -3 -45 17 50 -45 26 14 -42 58 0 -47 41 15 146 0 0 -45 44 22 21 16 37 20 282 -3 -45 40 12 -45 48 31 -43 22 1 -48 2 2 147 0 0 -46 5 22 21 16 34 19 281 -2 -46 1 16 -46 9 29 -43 44 36 -48 21 36 148 0 0 -46 25 7 21 16 31 18 281 -2 -46 21 3 -46 29 11 -44 5 49 -48 40 1 149 0 0 -46 43 39 21 16 28 17 280 -1 -46 39 37 -46 47 41 -44 25 43 -48 57 18 150 0 0 -47 1 1 21 16 25 17 279 -1 -46 57 1 -47 5 0 -44 44 21 -49 13 30 151 0 0 -47 17 14 21 16 22 16 279 0 -47 13 17 -47 21 12 -45 1 45 -49 28 39 Uncertainty in time = +/- 17 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 5108-00014-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 00 37.8770 DE: -05 53 54.799 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .019 ) * V mag [mag]: 10.2 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7778) Markrobinson approx. diameter [km]: 11 approx. diameter ["]: .015 distance from Earth [AU]: 1.00800 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 435 number of rejected observations: 12 time covered by the observations: 1982 May 19 - 2008 May 01 1 sigma uncertainty ellipse (major, minor, PA): 0.248, 0.072, 76° remarks: * orbital elements for (7778) Markrobinson : Mean anomaly = 322.96475823 deg Arg. of pericenter = 97.11981427 deg Long. of node = 224.67956976 deg Inclination = 19.56591785 deg Eccentricity = 0.32781965 Semimajor axis = 2.38370351 AU Perihelion dist = 1.60227865 AU Mag: H = 12.98, G = 0.15 Epoch of elements : MJD 54600.89100000 TDT (2008 May 14.891) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 14 7778 Markrobinson 21h 23.7m UT 10.2 18 0 37.877- 5 53 54.80TYC 5108-00014-1 11.5 14.9 11 1.0 1.008 -0.227 52.95 76.2358 -5.913 -141.84 18.88 21.3957 0.60181 0.03857 -0.38572 6.06576 -0.00290 -0.00123 2000 322.7261402008 514.00000 97.119814224.679570 19.5659180.32781965 2.3837035 1.602278712.5 5.00.15 RATE 2.6780930 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.249 0.074 76 17.35 0.246 0 54594.5020080514_0014-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org