IOTA/IOTA-ES occultation update for (18) Melpomene / TYC 5012-00787-1 event on 2008 Mar 05, 21:40 UT Visible from E Russia, China, SE Asia Summary ------- On 2008 Mar 05 UT, the 141 km diameter asteroid (18) Melpomene will occult a 11.4 mag star in the constellation Libra for observers along a path across E Russia, China, SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.7 mag to 11.2 mag (the magnitude of the asteroid) for at most 24.9 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: 99 * date and approx. time of event: 2008 Mar 05, 21:21 - 2008 Mar 05, 21:58 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 24.9 * Moon: 4 % sunlit, 97° distance * Sun: 119° distance * rough path description: E Russia, China, SE Asia The occultation path -------------------- * approximate projected width [km]: 141 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 6.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .023", 92° ) * approx speed of asteroid's shadow [km/s]: 5.6361 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5012-00787-1 by 18 Melpomene on 2008 Mar 5 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 132 0 0 58 39 50 21 58 33 18 222 0 57 42 31 59 37 7 57 5 48 60 13 45 131 0 0 58 3 39 21 58 28 19 221 -1 57 5 18 59 1 57 56 27 55 59 39 15 130 0 0 57 25 40 21 58 23 20 220 -1 56 26 14 58 25 3 55 48 9 59 3 2 129 0 0 56 45 46 21 58 17 21 219 -2 55 45 12 57 46 17 55 6 23 58 24 59 128 0 0 56 3 50 21 58 10 22 218 -2 55 2 4 57 5 32 54 22 29 57 45 0 127 0 0 55 19 45 21 58 3 23 217 -3 54 16 44 56 22 42 53 36 21 57 2 57 126 0 0 54 33 22 21 57 56 24 216 -3 53 29 2 55 37 37 52 47 48 56 18 42 125 0 0 53 44 32 21 57 48 25 216 -4 52 38 49 54 50 9 51 56 41 55 32 6 124 0 0 52 53 5 21 57 39 26 215 -4 51 45 55 54 0 9 51 2 51 54 43 1 123 0 0 51 58 51 21 57 29 27 214 -5 50 50 9 53 7 26 50 6 6 53 51 16 122 0 0 51 1 39 21 57 19 28 213 -5 49 51 21 52 11 49 49 6 16 52 56 40 121 0 0 50 1 17 21 57 7 29 212 -6 48 49 17 51 13 7 48 3 6 51 59 1 120 0 0 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Uncertainty in time = +/- 8 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: TYC 5012-00787-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 05 06.7632 DE: -05 57 34.763 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .021 ) * V mag [mag]: 11.4 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (18) Melpomene approx. diameter [km]: 141 approx. diameter ["]: .090 distance from Earth [AU]: 2.16200 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 3738 number of rejected observations: 303 time covered by the observations: 1901 Aug 14 - 2008 Feb 17 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.010, 105° remarks: * orbital elements for (18) Melpomene : Mean anomaly = 194.20338931 deg Arg. of pericenter = 227.92110596 deg Long. of node = 150.53227525 deg Inclination = 10.12668419 deg Eccentricity = 0.21881872 Semimajor axis = 2.29495375 AU Perihelion dist = 1.79277492 AU Mag: H = 6.51, G = 0.25 Epoch of elements : MJD 54530.90300000 TDT (2008 Mar 05.903) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 5 18 Melpomene 21h 40.7m UT 11.4 15 5 6.763- 5 57 34.76TYC 5012-00787-1 11.9 11.2 141 24.9 2.162 0.328 11.98 97.0998 -5.963 -142.34 -5.64 21.6783 -0.02860 0.01199 1.20638 2.94356 -0.00505 0.00089 2000 193.9473942008 3 5.00000227.921106150.532275 10.1266840.21881872 2.2949538 1.7927749 6.5 5.00.25 RATE 2.8349360 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.023 92 1.32 0.029 0 54523.5020080305_0787-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org