IOTA/IOTA-ES occultation update for (304) Olga / TYC 5276-00781-1 event on 2008 Oct 13, 18:15 UT Visible from E Russia, China, India Summary ------- On 2008 Oct 13 UT, the 68 km diameter asteroid (304) Olga will occult a 11.1 mag star in the constellation Cetus for observers along a path across E Russia, China, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 12.0 mag (the magnitude of the asteroid) for at most 8.3 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: 98 * date and approx. time of event: 2008 Oct 13, 18:03 - 2008 Oct 13, 18:27 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 8.3 * Moon: 98 % sunlit, 24° distance * Sun: 159° distance * rough path description: E Russia, China, India The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .033", 357° ) * approx speed of asteroid's shadow [km/s]: 8.1597 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5276-00781-1 by 304 Olga on 2008 Oct 13 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 148 6 18 65 0 0 18 3 32 1 238 -19 146 39 18 149 35 54 145 38 6 ... .. .. 144 31 50 64 0 0 18 3 33 2 235 -21 143 13 10 145 52 22 142 17 34 146 51 36 Latitude Latitude Latitude Latitude 143 0 0 63 31 48 18 3 33 3 234 -21 63 55 54 63 7 45 64 13 19 62 50 30 142 0 0 63 12 30 18 3 34 4 233 -22 63 36 49 62 48 16 63 54 23 62 30 51 141 0 0 62 52 30 18 3 35 4 232 -22 63 17 2 62 28 3 63 34 45 62 10 29 140 0 0 62 31 47 18 3 35 5 231 -23 62 56 32 62 7 6 63 14 25 61 49 24 139 0 0 62 10 18 18 3 36 6 230 -24 62 35 17 61 45 25 62 53 19 61 27 32 138 0 0 61 48 3 18 3 37 6 229 -24 62 13 16 61 22 56 62 31 28 61 4 54 137 0 0 61 25 0 18 3 38 7 228 -25 61 50 27 60 59 40 62 8 49 60 41 28 136 0 0 61 1 9 18 3 39 7 227 -25 61 26 49 60 35 34 61 45 22 60 17 12 135 0 0 60 36 26 18 3 40 8 226 -26 61 2 21 60 10 37 61 21 4 59 52 5 134 0 0 60 10 51 18 3 42 9 226 -27 60 37 1 59 44 48 60 55 55 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47 8 100 0 -27 58 28 -28 38 5 -27 44 9 -28 52 18 Uncertainty in time = +/- 3 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 5276-00781-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 24 56.6840 DE: -12 25 52.638 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .028 ) * V mag [mag]: 11.1 * B mag [mag]: 12.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (304) Olga approx. diameter [km]: 68 approx. diameter ["]: .092 distance from Earth [AU]: 1.02400 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 778 number of rejected observations: 82 time covered by the observations: 1903 May 20 - 2008 Sep 18 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.019, 81° remarks: * orbital elements for (304) Olga : Mean anomaly = 30.75164159 deg Arg. of pericenter = 172.21024872 deg Long. of node = 159.18686097 deg Inclination = 15.84022777 deg Eccentricity = 0.22103223 Semimajor axis = 2.40343551 AU Perihelion dist = 1.87219881 AU Mag: H = 9.72, G = 0.07 Epoch of elements : MJD 54752.76000000 TDT (2008 Oct 13.760) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 13 304 Olga 18h 15.7m UT 11.1 1 24 56.684-12 25 52.64TYC 5276-00781-1 12.1 12.0 68 8.3 1.024 -1.812 -29.31 84.6320 -12.423 -97.40 -8.11 18.2618 -0.25879 0.23392 -3.09037 -3.41483 -0.00019 0.00184 2000 30.02157220081011.00000172.210249159.186861 15.8402280.22103223 2.4034355 1.8721988 9.7 5.00.07 RATE 2.6451810 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.033 357 1.36 0.033 0 54740.5020081013_0781-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org