IOTA/IOTA-ES occultation update for (36) Atalante / TYC 8312-00800-1 event on 2009 Aug 01, 07:07 UT Visible from Summary ------- On 2009 Aug 01 UT, the 106 km diameter asteroid (36) Atalante will occult a 11.9 mag star in the constellation Norma for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.9 mag (the magnitude of the asteroid) for at most 12.6 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: 81 * date and approx. time of event: 2009 Aug 01, 06:55 - 2009 Aug 01, 07:20 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 12.6 * Moon: 81 % sunlit, 21° distance * Sun: 121° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 106 * 1 sigma uncertainty interval [path widths]: +/- 0.66 * 1 sigma uncertainty interval [seconds]: +/- 7.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .035", 99° ) * approx speed of asteroid's shadow [km/s]: 8.3903 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 8312-00800-1 by 36 Atalante on 2009 Aug 1 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 174 26 47 34 0 0 7 20 36 10 171 0 175 1 44 173 51 49 175 47 51 173 5 38 174 38 48 33 0 0 7 20 34 11 171 -1 175 13 21 174 4 14 175 58 56 173 18 36 174 50 37 32 0 0 7 20 31 12 171 -1 175 24 47 174 16 27 176 9 52 173 31 19 175 2 16 31 0 0 7 20 28 13 171 -2 175 36 4 174 28 28 176 20 40 173 43 48 175 13 45 30 0 0 7 20 25 14 171 -2 175 47 13 174 40 18 176 31 21 173 56 6 175 25 6 29 0 0 7 20 22 15 171 -3 175 58 13 174 51 58 176 41 56 174 8 12 175 36 18 28 0 0 7 20 19 16 172 -3 176 9 6 175 3 28 176 52 25 174 20 8 175 47 22 27 0 0 7 20 15 17 172 -4 176 19 53 175 14 51 177 2 48 174 31 54 175 58 20 26 0 0 7 20 11 18 172 -5 176 30 34 175 26 5 177 13 7 174 43 31 176 9 11 25 0 0 7 20 7 19 172 -5 176 41 9 175 37 13 177 23 21 174 55 0 176 19 57 24 0 0 7 20 2 20 172 -6 176 51 40 175 48 14 177 33 32 175 6 21 176 30 38 23 0 0 7 19 58 21 172 -6 177 2 6 175 59 9 177 43 40 175 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18 - 9 0 0 -59 15 26 6 56 0 16 196 -14 -57 35 53 -60 54 51 -55 24 5 -63 6 6 - 8 0 0 -57 27 16 6 55 53 14 195 -13 -55 42 20 -59 12 0 -53 23 15 -61 30 11 - 7 0 0 -55 26 31 6 55 47 12 195 -12 -53 35 35 -57 17 10 -51 8 20 -59 43 2 - 6 0 0 -53 11 7 6 55 41 10 194 -11 -51 13 25 -55 8 21 -48 36 57 -57 42 46 - 5 0 0 -50 38 30 6 55 36 7 193 -9 -48 33 9 -52 43 10 -45 46 10 -55 27 9 - 4 0 0 -47 45 32 6 55 32 4 192 -8 -45 31 25 -49 58 39 .. .. .. -52 53 26 - 3 0 0 -44 28 20 6 55 30 1 191 -6 .. .. .. -46 51 11 .. .. .. -49 58 15 Uncertainty in time = +/- 8 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 8312-00800-1 * constellation : Norma * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 28 37.2770 DE: -45 20 56.304 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .032 ) * V mag [mag]: 11.9 * B mag [mag]: 12.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (36) Atalante approx. diameter [km]: 106 approx. diameter ["]: .057 distance from Earth [AU]: 2.56000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 615 number of rejected observations: 50 time covered by the observations: 1901 Sep 22 - 2008 Feb 16 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.015, 112° remarks: * orbital elements for (36) Atalante : Mean anomaly = 251.74212265 deg Arg. of pericenter = 46.98661487 deg Long. of node = 358.46457781 deg Inclination = 18.43412049 deg Eccentricity = 0.30342087 Semimajor axis = 2.74647009 AU Perihelion dist = 1.91313374 AU Mag: H = 8.58, G = 0.15 Epoch of elements : MJD 55044.29700000 TDT (2009 Aug 01.297) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 1 36 Atalante 7h 8.1m UT 11.9 16 28 37.277-45 20 56.30TYC 8312-00800-1 12.2 13.9 106 12.6 2.560 -0.298 15.96 -169.9111 -45.353 74.55 17.96 7.1357 0.00831 0.00171 -0.91926 4.64563 0.00485 0.00042 2000 250.8116432009 728.00000 46.986615358.464578 18.4341200.30342087 2.7464701 1.9131337 8.5 5.00.15 RATE 2.1654180 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.035 99 1.66 0.038 0 54545.5020090801_0800-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org