IOTA/IOTA-ES occultation update for (515) Athalia / TYC 1374-01594-1 event on 2010 Feb 12, 11:16 UT Visible from W USA, W Canada Summary ------- On 2010 Feb 12 UT, the 38 km diameter asteroid (515) Athalia will occult a 11.4 mag star in the constellation Gemini for observers along a path across W USA, W Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 15.5 mag (the magnitude of the asteroid) for at most 4.7 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: 57 * date and approx. time of event: 2010 Feb 12, 11:08 - 2010 Feb 12, 11:23 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 4.7 * Moon: 2 % sunlit, 169° distance * Sun: 152° distance * rough path description: W USA, W Canada The occultation path -------------------- * approximate projected width [km]: 62 * 1 sigma uncertainty interval [path widths]: +/- 1.11 * 1 sigma uncertainty interval [seconds]: +/- 6.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .030", 96° ) * approx speed of asteroid's shadow [km/s]: 8.1978 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1374-01594-1 by 515 Athalia on 2010 Feb 12 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 - 87 40 16 35 0 0 11 8 27 1 296 -19 - 86 55 15 - 88 24 36 ... .. .. ... .. .. - 90 1 54 36 0 0 11 8 28 3 294 -21 - 89 18 24 - 90 44 49 - 87 39 33 - 92 18 6 Latitude Latitude Latitude Latitude - 92 0 0 36 52 3 11 8 31 5 293 -23 37 11 1 36 33 13 37 53 42 .. .. .. - 93 0 0 37 19 9 11 8 33 6 292 -24 37 38 14 37 0 14 38 21 9 36 18 46 - 94 0 0 37 46 42 11 8 35 7 292 -24 38 5 52 37 27 41 38 49 2 36 46 0 - 95 0 0 38 14 40 11 8 37 7 291 -25 38 33 57 37 55 33 39 17 20 37 13 39 - 96 0 0 38 43 2 11 8 40 8 291 -26 39 2 25 38 23 49 39 46 3 37 41 42 - 97 0 0 39 11 47 11 8 43 9 290 -27 39 31 17 38 52 28 40 15 10 38 10 8 - 98 0 0 39 40 55 11 8 47 10 289 -27 40 0 31 39 21 30 40 44 40 38 38 56 - 99 0 0 40 10 25 11 8 50 11 289 -28 40 30 8 39 50 53 41 14 31 39 8 6 -100 0 0 40 40 15 11 8 54 12 288 -29 41 0 5 40 20 37 41 44 43 39 37 36 -101 0 0 41 10 25 11 8 59 13 287 -29 41 30 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71 48 6 69 28 26 61 0 0 70 20 2 11 23 29 16 71 0 70 41 57 69 58 22 71 31 30 69 11 6 Uncertainty in time = +/- 7 secs Prediction of 2010 Jan 26.0 Data for the target star ------------------------ * name: TYC 1374-01594-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 48 11.7408 DE: +21 17 38.525 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .019 ) * V mag [mag]: 11.4 * B mag [mag]: 11.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (515) Athalia approx. diameter [km]: 38 approx. diameter ["]: .027 distance from Earth [AU]: 1.92000 * orbital information: orbit source: Preston date of fit: 2010 Jan 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 915 number of rejected observations: 42 time covered by the observations: 1903 Sep 20 - 2010 Jan 16 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.023, 98° remarks: * orbital elements for (515) Athalia : Mean anomaly = 47.62577990 deg Arg. of pericenter = 299.31801877 deg Long. of node = 121.22392611 deg Inclination = 2.03781488 deg Eccentricity = 0.16936168 Semimajor axis = 3.12634289 AU Perihelion dist = 2.59686021 AU Mag: H = 10.71, G = 0.15 Epoch of elements : MJD 55239.47000000 TDT (2010 Feb 12.470) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Feb 12 515 Athalia 11h 16.4m UT 11.4 7 48 11.741 21 17 38.53TYC 1374-01594-1 11.6 15.5 38 4.7 1.920 -1.466 5.38 165.5479 21.294 14.46 -13.64 11.2732 0.20046 0.76250 -4.47509 1.17619 0.00277 -0.00053 2000 45.9372872010 2 3.00000299.318019121.223926 2.0378150.16936168 3.1263429 2.596860211.2 5.00.15 RATE 1.7829920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.030 96 2.11 0.030 0 055222.0020100212_1594-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2010 Jan 25, 19:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org