IOTA/IOTA-ES occultation update for (18) Melpomene / TYC 0318-00244-1 event on 2008 May 18, 12:58 UT Visible from New Zealand, S Australia Summary ------- On 2008 May 18 UT, the 141 km diameter asteroid (18) Melpomene will occult a 11.4 mag star in the constellation Virgo for observers along a path across New Zealand, S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.4 mag to 10.6 mag (the magnitude of the asteroid) for at most 12.5 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: 99 * date and approx. time of event: 2008 May 18, 12:50 - 2008 May 18, 13:06 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 0.4 * estimated maximum duration [s]: 12.5 * Moon: 97 % sunlit, 21° distance * Sun: 151° distance * rough path description: New Zealand, S Australia The occultation path -------------------- * approximate projected width [km]: 169 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .024", 1° ) * approx speed of asteroid's shadow [km/s]: 11.2182 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0318-00244-1 by 18 Melpomene on 2008 May 18 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 65 0 0 -21 3 31 13 6 14 12 84 0 -20 17 54 -21 49 32 -19 52 31 -22 15 30 66 0 0 -21 5 17 13 6 11 13 84 -1 -20 19 40 -21 51 18 -19 54 17 -22 17 16 67 0 0 -21 7 18 13 6 9 13 83 -2 -20 21 40 -21 53 19 -19 56 18 -22 19 17 68 0 0 -21 9 33 13 6 6 14 83 -3 -20 23 56 -21 55 35 -19 58 33 -22 21 33 69 0 0 -21 12 4 13 6 4 15 82 -4 -20 26 26 -21 58 6 -20 1 2 -22 24 4 70 0 0 -21 14 49 13 6 1 16 82 -5 -20 29 10 -22 0 51 -20 3 47 -22 26 49 71 0 0 -21 17 48 13 5 57 17 82 -6 -20 32 9 -22 3 51 -20 6 46 -22 29 49 72 0 0 -21 21 2 13 5 54 18 81 -6 -20 35 23 -22 7 5 -20 9 59 -22 33 4 73 0 0 -21 24 30 13 5 51 19 81 -7 -20 38 50 -22 10 34 -20 13 26 -22 36 33 74 0 0 -21 28 13 13 5 47 20 80 -8 -20 42 32 -22 14 17 -20 17 8 -22 40 16 75 0 0 -21 32 9 13 5 43 21 80 -9 -20 46 29 -22 18 15 -20 21 4 -22 44 14 76 0 0 -21 36 20 13 5 39 22 79 -10 -20 50 39 -22 22 26 -20 25 14 -22 48 26 77 0 0 -21 40 45 13 5 35 22 79 -11 -20 55 3 -22 26 51 -20 29 37 -22 52 52 78 0 0 -21 45 24 13 5 31 23 78 -12 -20 59 41 -22 31 31 -20 34 15 -22 57 31 79 0 0 -21 50 16 13 5 27 24 78 -13 -21 4 32 -22 36 24 -20 39 6 -23 2 25 80 0 0 -21 55 22 13 5 22 25 77 -14 -21 9 37 -22 41 31 -20 44 10 -23 7 32 81 0 0 -22 0 41 13 5 18 26 77 -14 -21 14 56 -22 46 51 -20 49 28 -23 12 53 82 0 0 -22 6 14 13 5 13 27 76 -15 -21 20 28 -22 52 25 -20 55 0 -23 18 27 83 0 0 -22 12 0 13 5 8 28 76 -16 -21 26 13 -22 58 12 -21 0 44 -23 24 15 84 0 0 -22 17 59 13 5 3 28 75 -17 -21 32 11 -23 4 12 -21 6 42 -23 30 16 85 0 0 -22 24 11 13 4 57 29 75 -18 -21 38 22 -23 10 25 -21 12 52 -23 36 30 86 0 0 -22 30 36 13 4 52 30 74 -19 -21 44 46 -23 16 51 -21 19 16 -23 42 56 87 0 0 -22 37 14 13 4 47 31 74 -20 -21 51 22 -23 23 30 -21 25 51 -23 49 36 88 0 0 -22 44 4 13 4 41 32 73 -21 -21 58 11 -23 30 21 -21 32 40 -23 56 28 89 0 0 -22 51 7 13 4 35 33 72 -22 -22 5 13 -23 37 25 -21 39 40 -24 3 32 90 0 0 -22 58 21 13 4 29 33 72 -23 -22 12 26 -23 44 41 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5 -41 39 56 -44 5 31 -163 0 0 -43 0 26 12 51 51 26 299 -55 -42 14 2 -43 47 17 -41 48 13 -44 13 42 -162 0 0 -43 8 31 12 51 47 25 299 -54 -42 22 8 -43 55 19 -41 56 20 -44 21 44 -161 0 0 -43 16 26 12 51 43 25 298 -54 -42 30 4 -44 3 12 -42 4 17 -44 29 36 -160 0 0 -43 24 11 12 51 40 24 297 -53 -42 37 51 -44 10 56 -42 12 5 -44 37 18 -159 0 0 -43 31 46 12 51 36 23 296 -52 -42 45 28 -44 18 29 -42 19 43 -44 44 51 -158 0 0 -43 39 12 12 51 33 23 296 -52 -42 52 55 -44 25 53 -42 27 11 -44 52 13 -157 0 0 -43 46 27 12 51 30 22 295 -51 -43 0 12 -44 33 7 -42 34 29 -44 59 26 -156 0 0 -43 53 33 12 51 26 21 294 -50 -43 7 20 -44 40 11 -42 41 37 -45 6 29 -155 0 0 -44 0 28 12 51 23 21 293 -50 -43 14 17 -44 47 4 -42 48 35 -45 13 22 -154 0 0 -44 7 13 12 51 20 20 293 -49 -43 21 4 -44 53 48 -42 55 23 -45 20 4 -153 0 0 -44 13 48 12 51 18 19 292 -48 -43 27 40 -45 0 21 -43 2 1 -45 26 36 -152 0 0 -44 20 13 12 51 15 18 291 -48 -43 34 7 -45 6 44 -43 8 28 -45 32 59 -151 0 0 -44 26 27 12 51 12 18 290 -47 -43 40 23 -45 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17 40 -44 20 16 -46 43 42 -137 0 0 -45 35 14 12 50 46 8 280 -37 -44 49 29 -46 21 23 -44 24 2 -46 47 24 -136 0 0 -45 38 47 12 50 45 7 280 -36 -44 53 4 -46 24 55 -44 27 38 -46 50 56 -135 0 0 -45 42 9 12 50 44 7 279 -36 -44 56 27 -46 28 16 -44 31 2 -46 54 16 -134 0 0 -45 45 21 12 50 43 6 278 -35 -44 59 39 -46 31 26 -44 34 14 -46 57 26 -133 0 0 -45 48 21 12 50 42 5 277 -34 -45 2 41 -46 34 25 -44 37 16 -47 0 24 -132 0 0 -45 51 10 12 50 42 4 277 -34 -45 5 30 -46 37 13 -44 40 7 -47 3 11 -131 0 0 -45 53 47 12 50 41 4 276 -33 -45 8 9 -46 39 50 -44 42 46 -47 5 47 -130 0 0 -45 56 14 12 50 41 3 275 -32 -45 10 37 -46 42 15 -44 45 14 -47 8 12 -129 0 0 -45 58 29 12 50 40 2 275 -32 -45 12 53 -46 44 30 -44 47 30 -47 10 26 -128 0 0 -46 0 33 12 50 40 2 274 -31 -45 14 58 -46 46 33 -44 49 36 -47 12 29 -127 0 0 -46 2 26 12 50 40 1 273 -30 -45 16 51 -46 48 25 -44 51 30 -47 14 21 -126 0 0 -46 4 7 12 50 40 0 272 -29 -45 18 33 -46 50 6 -44 53 12 -47 16 1 Uncertainty in time = +/- 4 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 0318-00244-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 20 09.5755 DE: +01 29 13.966 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .028 ) * V mag [mag]: 11.4 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (18) Melpomene approx. diameter [km]: 141 approx. diameter ["]: .108 distance from Earth [AU]: 1.80600 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 3767 number of rejected observations: 303 time covered by the observations: 1901 Aug 14 - 2008 May 01 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.011, 100° remarks: * orbital elements for (18) Melpomene : Mean anomaly = 215.09654072 deg Arg. of pericenter = 227.90973491 deg Long. of node = 150.53156938 deg Inclination = 10.12663404 deg Eccentricity = 0.21881138 Semimajor axis = 2.29500363 AU Perihelion dist = 1.79283072 AU Mag: H = 6.52, G = 0.25 Epoch of elements : MJD 54604.54100000 TDT (2008 May 18.541) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 18 18 Melpomene 12h 58.6m UT 11.4 14 20 9.576 1 29 13.97TYC 0318-00244-1 12.4 10.6 141 12.5 1.806 -2.007 6.64 143.8172 1.485 -15.52 19.71 12.9759 -0.11889 -0.53707 -6.18256 1.36688 0.00184 -0.00200 2000 213.8092392008 514.00000227.909735150.531569 10.1266340.21881138 2.2950036 1.7928307 6.5 5.00.25 RATE 2.8348430 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.024 1 1.28 0.030 0 54594.5020080518_0244-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org