IOTA/IOTA-ES occultation update for (1330) Spiridonia / TYC 5744-00649-1 event on 2012 Sep 03, 02:27 UT Visible from Africa, Brazil Summary ------- On 2012 Sep 03 UT, the 63 km diameter asteroid (1330) Spiridonia will occult a 10.2 mag star in the constellation Capricornus for observers along a path across Africa, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 15.3 mag (the magnitude of the asteroid) for at most 6.1 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 64 * date and approx. time of event: 2012 Sep 03, 02:18 - 2012 Sep 03, 02:35 UT * geocentric midpoint of event [JD]: 2456173.60201667 * magnitude of target star: 10.2 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 6.1 * Moon: 93 % sunlit, 66° distance * Sun: 142° distance * rough path description: Africa, Brazil The occultation path -------------------- * approximate projected width [km]: 74 * 1 sigma uncertainty interval [path widths]: +/- 0.95 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .029", 90° ) * approx speed of asteroid's shadow [km/s]: 10.3316 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5744-00649-1 by 1330 Spiridonia on 2012 Sep 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 10 4 2 18 0 0 2 18 13 3 258 -39 8 40 53 11 35 23 6 19 4 ... .. .. 6 20 45 17 0 0 2 18 18 7 257 -43 5 12 46 7 32 54 3 12 46 10 5 5 Latitude Latitude Latitude Latitude 5 0 0 16 34 51 2 18 20 8 257 -44 16 55 55 16 13 42 17 35 44 15 33 16 4 0 0 16 14 57 2 18 22 9 256 -45 16 36 8 15 53 42 17 16 9 15 13 3 3 0 0 15 54 1 2 18 24 10 256 -46 16 15 18 15 32 38 16 55 32 14 51 47 2 0 0 15 32 1 2 18 26 11 256 -47 15 53 25 15 10 31 16 33 52 14 29 25 1 0 0 15 8 57 2 18 29 12 256 -48 15 30 29 14 47 19 16 11 9 14 5 59 0 0 0 14 44 47 2 18 32 13 255 -49 15 6 27 14 23 2 15 47 23 13 41 26 - 1 0 0 14 19 32 2 18 35 14 255 -50 14 41 20 13 57 38 15 22 31 13 15 46 - 2 0 0 13 53 10 2 18 38 15 255 -51 14 15 7 13 31 8 14 56 34 12 48 59 - 3 0 0 13 25 41 2 18 42 16 255 -52 13 47 47 13 3 29 14 29 31 12 21 3 - 4 0 0 12 57 3 2 18 46 17 255 -53 13 19 18 12 34 42 14 1 20 11 51 56 - 5 0 0 12 27 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-84 18 49 166 0 0 -83 6 2 2 35 29 7 117 -1 -82 42 29 -83 29 43 -81 58 3 -84 15 5 165 0 0 -83 1 24 2 35 29 7 118 -1 -82 37 37 -83 25 20 -81 52 45 -84 11 9 164 0 0 -82 56 34 2 35 29 7 119 -1 -82 32 31 -83 20 44 -81 47 12 -84 7 2 163 0 0 -82 51 29 2 35 29 7 120 -1 -82 27 12 -83 15 55 -81 41 24 -84 2 44 162 0 0 -82 46 11 2 35 29 7 121 -1 -82 21 37 -83 10 53 -81 35 20 -83 58 14 161 0 0 -82 40 38 2 35 30 6 122 -1 -82 15 47 -83 5 37 -81 28 59 -83 53 30 160 0 0 -82 34 49 2 35 30 6 123 0 -82 9 41 -83 0 6 -81 22 21 -83 48 34 159 0 0 -82 28 44 2 35 30 6 124 0 -82 3 19 -82 54 19 -81 15 25 -83 43 23 158 0 0 -82 22 22 2 35 30 6 125 0 -81 56 38 -82 48 17 -81 8 9 -83 37 58 Uncertainty in time = +/- 6 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 5744-00649-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 15 32.6151 DE: -10 26 31.161 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .024 ) * V mag [mag]: 10.2 * B mag [mag]: 10.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1330) Spiridonia approx. diameter [km]: 63 approx. diameter ["]: .035 distance from Earth [AU]: 2.51300 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 975 number of rejected observations: 34 time covered by the observations: 1933 Aug 28 - 2012 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.017, 90° remarks: * orbital elements for (1330) Spiridonia : Mean anomaly = 142.87951434 deg Arg. of pericenter = 6.81169995 deg Long. of node = 158.85685372 deg Inclination = 15.95366025 deg Eccentricity = 0.07484148 Semimajor axis = 3.17086758 AU Perihelion dist = 2.93355515 AU Mag: H = 9.95, G = 0.15 Epoch of elements : MJD 56173.10200000 TDT (2012 Sep 03.102) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 3 1330 Spiridonia 2h 26.9m UT 10.2 20 15 32.615-10 26 31.16TYC 5744-00649-1 10.7 15.3 63 6.1 2.513 -0.867 -15.88 -75.4744 -10.438 143.11 7.44 2.4484 0.41506 -0.33431 -3.66035 -4.53957 0.00352 0.00006 2000 142.3380392012 831.00000 6.811700158.856854 15.9536600.07484148 3.1708676 2.933555210.0 5.00.15 RATE 1.7455680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.029 90 1.95 0.033 0 0 1-1 056165.0020120903_0649-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org