IOTA/IOTA-ES occultation update for (23) Thalia / UCAC2 26588816 event on 2009 Aug 03, 07:39 UT Visible from Summary ------- On 2009 Aug 03 UT, the 106 km diameter asteroid (23) Thalia will occult a 11.9 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.0 mag (the magnitude of the asteroid) for at most 15.8 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: 91 * date and approx. time of event: 2009 Aug 03, 07:28 - 2009 Aug 03, 07:55 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 0.8 * estimated maximum duration [s]: 15.8 * Moon: 94 % sunlit, 74° distance * Sun: 133° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 108 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .029", 357° ) * approx speed of asteroid's shadow [km/s]: 6.7188 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 26588816 by 23 Thalia on 2009 Aug 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 Latitude Latitude Latitude Latitude - 28 0 0 20 13 0 7 28 20 42 227 -1 20 58 50 19 27 2 21 45 27 18 40 0 - 29 0 0 19 2 51 7 28 37 44 227 -2 19 49 11 18 16 22 20 36 20 17 28 48 - 30 0 0 17 50 55 7 28 55 45 227 -3 18 37 46 17 3 55 19 25 25 16 15 50 - 31 0 0 16 37 13 7 29 13 47 227 -4 17 24 35 15 49 42 18 12 45 15 1 5 - 32 0 0 15 21 46 7 29 32 48 227 -6 16 9 38 14 33 44 16 58 19 13 44 35 - 33 0 0 14 4 35 7 29 51 50 227 -7 14 52 58 13 16 3 15 42 9 12 26 22 - 34 0 0 12 45 43 7 30 12 51 228 -8 13 34 36 11 56 40 14 24 18 11 6 28 - 35 0 0 11 25 11 7 30 33 53 228 -10 12 14 34 10 35 38 13 4 45 9 44 54 - 36 0 0 10 3 2 7 30 55 54 228 -11 10 52 54 9 12 59 11 43 36 8 21 44 - 37 0 0 8 39 19 7 31 18 56 229 -12 9 29 41 7 48 47 10 20 51 6 57 1 - 38 0 0 7 14 6 7 31 42 57 230 -14 8 4 56 6 23 5 8 56 35 5 30 48 - 39 0 0 5 47 27 7 32 6 59 230 -15 6 38 45 4 55 57 7 30 52 4 3 10 - 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-66 39 12 -68 55 22 173 0 0 -67 33 21 7 55 9 3 121 -24 -66 59 22 -68 7 23 -66 24 48 -68 42 11 172 0 0 -67 18 57 7 55 9 2 122 -23 -66 44 40 -67 53 18 -66 9 46 -68 28 25 171 0 0 -67 3 55 7 55 10 2 123 -23 -66 29 19 -67 38 36 -65 54 6 -68 14 3 170 0 0 -66 48 14 7 55 10 1 124 -23 -66 13 18 -67 23 15 -65 37 45 -67 59 3 169 0 0 -66 31 53 7 55 10 1 125 -22 -65 56 36 -67 7 15 -65 20 42 -67 43 25 168 0 0 -66 14 50 7 55 10 0 126 -22 .. .. .. -66 50 34 .. .. .. -67 27 6 Uncertainty in time = +/- 10 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 26588816 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 07 28.3985 DE: -14 01 22.455 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .037 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (23) Thalia approx. diameter [km]: 106 approx. diameter ["]: .064 distance from Earth [AU]: 2.28800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1095 number of rejected observations: 121 time covered by the observations: 1909 Mar 24 - 2007 Jul 25 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.012, 58° remarks: * orbital elements for (23) Thalia : Mean anomaly = 232.62570720 deg Arg. of pericenter = 60.44203930 deg Long. of node = 66.95252009 deg Inclination = 10.11006764 deg Eccentricity = 0.23391352 Semimajor axis = 2.62805458 AU Perihelion dist = 2.01331709 AU Mag: H = 6.99, G = 0.15 Epoch of elements : MJD 55046.31900000 TDT (2009 Aug 03.319) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 3 23 Thalia 7h 39.7m UT 11.9 0 7 28.399-14 1 22.45UCAC2 26588816 0.0 12.0 106 15.8 2.288 -0.512 -12.55 -65.0718 -14.020 66.64 17.44 7.6611 0.16162 -0.09501 -1.93294 -3.26271 -0.00400 -0.00077 2000 231.1638642009 728.00000 60.442039 66.952520 10.1100680.23391352 2.6280546 2.0133171 7.0 5.00.15 RATE 2.3134090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.029 357 1.51 0.033 0 54545.5020090803_588816 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org