IOTA/IOTA-ES occultation update for (36) Atalante / TYC 8330-04843-1 event on 2009 Jul 01, 05:46 UT Visible from Summary ------- On 2009 Jul 01 UT, the 106 km diameter asteroid (36) Atalante will occult a 8.2 mag star in the constellation Ara for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 13.6 mag (the magnitude of the asteroid) for at most 7.8 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: 94 * date and approx. time of event: 2009 Jul 01, 05:39 - 2009 Jul 01, 05:51 UT * magnitude of target star: 8.2 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 7.8 * Moon: 68 % sunlit, 48° distance * Sun: 146° distance * rough path description: Additional comments ------------------- 3.5" double star The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .029", 102° ) * approx speed of asteroid's shadow [km/s]: 13.6067 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 8330-04843-1 by 36 Atalante on 2009 Jul 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 Latitude Latitude Latitude Latitude 168 0 0 -32 49 19 5 51 42 32 130 -1 -31 42 16 -33 57 58 -30 41 53 -35 2 41 169 0 0 -34 20 37 5 51 33 34 129 -2 -33 12 38 -35 30 19 -32 11 26 -36 36 3 170 0 0 -35 51 56 5 51 24 35 128 -3 -34 43 0 -37 2 38 -33 41 1 -38 9 24 171 0 0 -37 23 5 5 51 15 37 127 -5 -36 13 14 -38 34 47 -35 10 28 -39 42 33 172 0 0 -38 53 54 5 51 5 38 126 -6 -37 43 9 -40 6 34 -36 39 38 -41 15 18 173 0 0 -40 24 12 5 50 55 40 125 -7 -39 12 37 -41 37 49 -38 8 21 -42 47 30 174 0 0 -41 53 51 5 50 45 41 123 -9 -40 41 26 -43 8 21 -39 36 29 -44 18 58 175 0 0 -43 22 38 5 50 34 43 122 -10 -42 9 27 -44 38 0 -41 3 51 -45 49 29 176 0 0 -44 50 25 5 50 24 44 120 -11 -43 36 30 -46 6 35 -42 30 18 -47 18 52 177 0 0 -46 17 0 5 50 13 45 119 -12 -45 2 26 -47 33 54 -43 55 41 -48 46 57 178 0 0 -47 42 15 5 50 3 46 117 -13 -46 27 5 -48 59 48 -45 19 50 -50 13 32 179 0 0 -49 5 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211 -6 -38 7 58 -40 35 8 -37 2 49 -41 45 44 18 0 0 -37 46 51 5 39 43 7 211 -5 -36 35 9 -39 0 28 -35 30 45 -40 10 5 19 0 0 -36 12 40 5 39 42 5 210 -4 -35 1 53 -37 25 17 -33 58 16 -38 33 54 20 0 0 -34 38 12 5 39 40 3 210 -2 -33 28 22 -35 49 47 -32 25 33 -36 57 21 21 0 0 -33 3 37 5 39 40 1 209 -1 -31 54 46 -34 14 9 .. .. .. -35 20 40 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 8330-04843-1 * constellation : Ara * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 47 35.8190 DE: -48 20 55.613 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .025 ) * V mag [mag]: 8.2 * B mag [mag]: 8.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (36) Atalante approx. diameter [km]: 106 approx. diameter ["]: .062 distance from Earth [AU]: 2.37200 * 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): 0.029, 0.015, 108° remarks: * orbital elements for (36) Atalante : Mean anomaly = 245.00560704 deg Arg. of pericenter = 46.99373987 deg Long. of node = 358.46566061 deg Inclination = 18.43413152 deg Eccentricity = 0.30342717 Semimajor axis = 2.74636379 AU Perihelion dist = 1.91304239 AU Mag: H = 8.58, G = 0.15 Epoch of elements : MJD 55013.24000000 TDT (2009 Jul 01.240) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 1 36 Atalante 5h 46.4m UT 8.2 16 47 35.819-48 20 55.61TYC 8330-04843-1 8.4 13.6 106 7.8 2.372 -2.648 10.65 -114.1195 -48.352 94.37 23.10 5.7733 -0.18861 -0.46773 -7.12361 2.86999 0.00249 0.00194 2000 244.3039712009 628.00000 46.993740358.465661 18.4341320.30342717 2.7463638 1.9130424 8.5 5.00.15 RATE 2.1655440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.029 102 1.46 0.028 0 54545.5020090701_4843-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org