IOTA/IOTA-ES occultation update for (31) Euphrosyne / TYC 6125-00658-1 event on 2008 Jun 16, 14:22 UT Visible from Australia Summary ------- On 2008 Jun 16 UT, the 256 km diameter asteroid (31) Euphrosyne will occult a 10.9 mag star in the constellation Virgo for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 12.5 mag (the magnitude of the asteroid) for at most 56.1 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 Jun 16, 14:06 - 2008 Jun 16, 14:39 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 56.1 * Moon: 96 % sunlit, 34° distance * Sun: 122° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 354 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 10.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .024", 83° ) * approx speed of asteroid's shadow [km/s]: 4.5624 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6125-00658-1 by 31 Euphrosyne on 2008 Jun 16 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 177 54 22 - 9 0 0 14 6 4 2 253 -59 173 27 38 ... .. .. 171 56 17 ... .. .. 175 8 38 -10 0 0 14 6 9 5 253 -61 171 3 44 179 57 17 169 38 19 ... .. .. 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132 -10 -74 10 46 -79 6 1 -73 18 49 -80 7 18 - 52 0 0 -76 16 14 14 39 17 8 133 -10 -73 52 0 -78 51 1 -72 59 28 -79 53 14 - 53 0 0 -75 58 25 14 39 19 8 134 -10 -73 32 28 -78 35 19 -72 39 22 -79 38 29 - 54 0 0 -75 39 50 14 39 21 7 135 -9 -73 12 9 -78 18 53 -72 18 28 -79 23 0 - 55 0 0 -75 20 27 14 39 22 7 136 -9 -72 51 1 -78 1 39 -71 56 45 -79 6 45 - 56 0 0 -75 0 13 14 39 24 6 137 -9 -72 29 1 -77 43 36 -71 34 11 -78 49 41 - 57 0 0 -74 39 6 14 39 26 6 138 -9 -72 6 9 -77 24 41 -71 10 43 -78 31 47 - 58 0 0 -74 17 4 14 39 27 5 139 -8 -71 42 22 -77 4 52 -70 46 21 -78 12 58 - 59 0 0 -73 54 5 14 39 29 5 140 -8 -71 17 38 -76 44 5 -70 21 2 -77 53 12 - 60 0 0 -73 30 6 14 39 30 5 141 -8 -70 51 55 -76 22 19 -69 54 44 -77 32 26 - 61 0 0 -73 5 5 14 39 31 4 142 -7 -70 25 10 -75 59 29 -69 27 26 -77 10 38 - 62 0 0 -72 39 0 14 39 33 3 143 -7 -69 57 23 -75 35 34 -68 59 5 -76 47 43 - 63 0 0 -72 11 48 14 39 34 3 144 -7 -69 28 31 -75 10 31 .. .. .. -76 23 40 - 64 0 0 -71 43 27 14 39 35 2 145 -6 -68 58 31 -74 44 15 .. .. .. -75 58 23 - 65 0 0 -71 13 54 14 39 35 2 146 -6 .. .. .. -74 16 45 .. .. .. -75 31 51 - 66 0 0 -70 43 7 14 39 36 1 146 -6 .. .. .. -73 47 58 .. .. .. -75 3 59 - 67 0 0 -70 11 5 14 39 36 1 147 -5 .. .. .. -73 17 49 .. .. .. -74 34 45 Uncertainty in time = +/- 11 secs [Prediction of 2008 Jun 12.0] Data for the target star ------------------------ * name: TYC 6125-00658-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 35 04.5578 DE: -17 12 40.570 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .020 ) * V mag [mag]: 10.9 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (31) Euphrosyne approx. diameter [km]: 256 approx. diameter ["]: .124 distance from Earth [AU]: 2.85100 * orbital information: orbit source: Preston date of fit: 2008 Jun 12 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 989 number of rejected observations: 86 time covered by the observations: 1907 Apr 10 - 2008 Jun 12 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.011, 143° remarks: * orbital elements for (31) Euphrosyne : Mean anomaly = 108.69694802 deg Arg. of pericenter = 61.95314300 deg Long. of node = 31.23327273 deg Inclination = 26.31686572 deg Eccentricity = 0.22549033 Semimajor axis = 3.14849849 AU Perihelion dist = 2.43854252 AU Mag: H = 6.76, G = 0.15 Epoch of elements : MJD 54633.59900000 TDT (2008 Jun 16.599) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jun 16 31 Euphrosyne 14h 22.9m UT 10.9 13 35 4.558-17 12 40.57TYC 6125-00658-1 11.3 12.5 256 56.1 2.851 -0.453 -4.56 82.8244 -17.210 -35.51 23.37 14.3813 0.39625 -0.56632 -2.10887 -1.47783 0.00458 -0.00141 2000 108.0620112008 613.00000 61.953143 31.233273 26.3168660.22549033 3.1484985 2.4385425 6.7 5.00.15 RATE 1.7642040 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.024 0.024 83 1.19 0.024 0 54629.5020080616_0658-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 12, 19:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org