IOTA/IOTA-ES occultation update for (152) Atala / UCAC2 42203229 event on 2009 Oct 03, 02:36 UT Visible from Summary ------- On 2009 Oct 03 UT, the 123 km diameter asteroid (152) Atala will occult a 11.0 mag star in the constellation Auriga for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 13.7 mag (the magnitude of the asteroid) for at most 11.4 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 Oct 03, 02:29 - 2009 Oct 03, 02:34 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 11.4 * Moon: 98 % sunlit, 88° distance * Sun: 104° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 170 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .029", 84° ) * approx speed of asteroid's shadow [km/s]: 10.8003 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 42203229 by 152 Atala on 2009 Oct 3 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 14 20 23 -58 0 0 2 29 8 1 19 -15 15 50 42 12 50 37 17 12 32 ... .. .. 14 59 15 -57 0 0 2 29 8 2 18 -15 16 27 21 13 31 43 17 47 10 12 13 21 15 38 2 -56 0 0 2 29 8 3 17 -15 17 4 3 14 12 34 18 22 0 12 56 4 16 16 44 -55 0 0 2 29 9 4 17 -15 17 40 49 14 53 13 18 57 1 13 38 27 16 55 25 -54 0 0 2 29 10 5 16 -15 18 17 42 15 33 41 19 32 17 14 20 34 17 34 6 -53 0 0 2 29 12 6 16 -16 18 54 42 16 14 3 20 7 46 15 2 27 18 12 49 -52 0 0 2 29 14 7 15 -16 19 31 51 16 54 21 20 43 30 15 44 9 18 51 36 -51 0 0 2 29 16 8 15 -16 20 9 10 17 34 35 21 19 31 16 25 43 19 30 29 -50 0 0 2 29 18 9 14 -16 20 46 41 18 14 50 21 55 48 17 7 12 20 9 29 -49 0 0 2 29 20 10 14 -16 21 24 25 18 55 7 22 32 23 17 48 38 20 48 39 -48 0 0 2 29 23 11 13 -16 22 2 24 19 35 28 23 9 18 18 30 3 21 27 59 -47 0 0 2 29 26 12 13 -16 22 40 38 20 15 55 23 46 32 19 11 30 22 7 32 -46 0 0 2 29 30 14 12 -16 23 19 9 20 56 29 24 24 8 19 53 0 22 47 18 -45 0 0 2 29 34 15 12 -16 23 57 58 21 37 14 25 2 6 20 34 37 23 27 21 -44 0 0 2 29 38 16 11 -16 24 37 8 22 18 9 25 40 28 21 16 21 24 7 41 -43 0 0 2 29 42 17 10 -16 25 16 39 22 59 19 26 19 16 21 58 15 24 48 20 -42 0 0 2 29 47 18 10 -16 25 56 32 23 40 43 26 58 29 22 40 21 25 29 19 -41 0 0 2 29 52 19 9 -15 26 36 51 24 22 25 27 38 10 23 22 41 26 10 42 -40 0 0 2 29 57 20 9 -15 27 17 35 25 4 26 28 18 21 24 5 17 26 52 28 -39 0 0 2 30 3 21 8 -15 27 58 48 25 46 47 28 59 3 24 48 10 27 34 41 -38 0 0 2 30 9 22 7 -15 28 40 30 26 29 32 29 40 18 25 31 24 28 17 23 -37 0 0 2 30 15 23 7 -14 29 22 43 27 12 41 30 22 7 26 14 59 29 0 34 -36 0 0 2 30 22 24 6 -14 30 5 30 27 56 18 31 4 33 26 58 59 29 44 18 -35 0 0 2 30 29 25 5 -14 30 48 53 28 40 23 31 47 38 27 43 25 30 28 36 -34 0 0 2 30 36 26 5 -13 31 32 54 29 25 1 32 31 23 28 28 20 31 13 32 -33 0 0 2 30 44 27 4 -13 32 17 34 30 10 12 33 15 52 29 13 46 31 59 6 -32 0 0 2 30 52 28 3 -13 33 2 58 30 55 59 34 1 6 29 59 45 32 45 23 -31 0 0 2 31 0 29 3 -12 33 49 7 31 42 25 34 47 9 30 46 21 33 32 25 -30 0 0 2 31 9 30 2 -12 34 36 4 32 29 33 35 34 4 31 33 36 34 20 15 -29 0 0 2 31 18 31 1 -11 35 23 53 33 17 26 36 21 53 32 21 32 35 8 57 -28 0 0 2 31 27 32 0 -11 36 12 36 34 6 7 37 10 40 33 10 13 35 58 32 -27 0 0 2 31 37 33 359 -10 37 2 18 34 55 38 38 0 29 33 59 43 36 49 7 -26 0 0 2 31 47 34 358 -9 37 53 2 35 46 5 38 51 23 34 50 4 37 40 44 -25 0 0 2 31 57 35 357 -9 38 44 53 36 37 30 39 43 28 35 41 21 38 33 27 -24 0 0 2 32 8 36 356 -8 39 37 55 37 29 58 40 36 49 36 33 37 39 27 23 -23 0 0 2 32 20 37 355 -7 40 32 13 38 23 34 41 31 30 37 26 57 40 22 36 -22 0 0 2 32 31 38 354 -7 41 27 53 39 18 23 42 27 38 38 21 26 41 19 12 -21 0 0 2 32 43 39 353 -6 42 25 1 40 14 29 43 25 19 39 17 9 42 17 17 -20 0 0 2 32 56 40 352 -5 43 23 45 41 12 0 44 24 40 40 14 12 43 16 59 -19 0 0 2 33 9 41 350 -4 44 24 11 42 11 2 45 25 51 41 12 41 44 18 25 -18 0 0 2 33 22 42 349 -3 45 26 30 43 11 42 46 29 1 42 12 43 45 21 46 -17 0 0 2 33 36 42 347 -2 46 30 50 44 14 9 47 34 20 43 14 25 46 27 11 -16 0 0 2 33 50 43 346 -1 47 37 23 45 18 32 48 42 0 44 17 58 47 34 51 -15 0 0 2 34 5 44 344 0 48 46 21 46 25 2 49 52 17 45 23 30 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 42203229 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 39 19.0103 DE: +29 38 14.009 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .027 ) * V mag [mag]: 11.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (152) Atala approx. diameter [km]: 123 approx. diameter ["]: .067 distance from Earth [AU]: 2.52200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 569 number of rejected observations: 88 time covered by the observations: 1905 Feb 26 - 2007 Nov 19 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.012, 79° remarks: * orbital elements for (152) Atala : Mean anomaly = 332.42850469 deg Arg. of pericenter = 58.53866665 deg Long. of node = 40.00923857 deg Inclination = 12.11278793 deg Eccentricity = 0.07534629 Semimajor axis = 3.13966935 AU Perihelion dist = 2.90310692 AU Mag: H = 8.12, G = 0.15 Epoch of elements : MJD 55107.10900000 TDT (2009 Oct 03.109) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 3 152 Atala 2h 36.2m UT 11.0 5 39 19.010 29 38 14.01UCAC2 42203229 0.0 13.7 123 11.4 2.522 1.333 12.22 33.8304 29.633 138.22 -3.97 2.6039 0.39693 -0.56346 4.98885 3.50321 -0.00556 -0.00036 2000 331.1690382009 926.00000 58.538667 40.009239 12.1127880.07534629 3.1396694 2.9031069 8.3 5.00.15 RATE 1.7716510 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.029 84 1.45 0.030 0 54545.5020091003_203229 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org