IOTA/IOTA-ES occultation update for (510) Mabella / TYC 4947-00852-1 event on 2008 Apr 05, 16:05 UT Visible from New Zealand, Australia, Indonesia, India, Arabia Summary ------- On 2008 Apr 05 UT, the 57 km diameter asteroid (510) Mabella will occult a 9.8 mag star in the constellation Virgo for observers along a path across New Zealand, Australia, Indonesia, India, Arabia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 13.2 mag (the magnitude of the asteroid) for at most 4.6 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: 84 * date and approx. time of event: 2008 Apr 05, 15:56 - 2008 Apr 05, 16:13 UT * midpoint of event [JD]: 2454562.17023333 * magnitude of target star: 9.8 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 4.6 * Moon: 0 % sunlit, 179° distance * Sun: 172° distance * rough path description: New Zealand, Australia, Indonesia, India, Arabia The occultation path -------------------- * approximate projected width [km]: 57 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .029", 98° ) * approx speed of asteroid's shadow [km/s]: 12.3807 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4947-00852-1 by 510 Mabella on 2008 Apr 5 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 33 34 40 32 0 0 16 13 36 9 103 -2 34 49 58 32 15 15 36 18 32 30 29 49 Latitude Latitude Latitude Latitude 34 0 0 31 54 44 16 13 35 9 103 -2 32 10 38 31 38 50 32 30 21 31 19 6 35 0 0 31 41 53 16 13 34 10 104 -3 31 57 49 31 25 56 32 17 35 31 6 9 36 0 0 31 28 27 16 13 33 11 104 -4 31 44 25 31 12 28 32 4 14 30 52 38 37 0 0 31 14 26 16 13 31 12 105 -5 31 30 28 30 58 25 31 50 20 30 38 32 38 0 0 30 59 51 16 13 29 13 105 -6 31 15 56 30 43 47 31 35 51 30 23 51 39 0 0 30 44 42 16 13 27 14 106 -7 31 0 49 30 28 35 31 20 47 30 8 35 40 0 0 30 28 58 16 13 26 14 106 -8 30 45 7 30 12 48 31 5 9 29 52 45 41 0 0 30 12 38 16 13 23 15 107 -9 30 28 51 29 56 25 30 48 56 29 36 19 42 0 0 29 55 44 16 13 21 16 107 -9 30 11 59 29 39 28 30 32 8 29 19 17 43 0 0 29 38 13 16 13 19 17 108 -10 29 54 32 29 21 55 30 14 45 29 1 40 44 0 0 29 20 8 16 13 16 18 108 -11 29 36 30 29 3 46 29 56 47 28 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-40 30 27 -41 1 35 -40 11 8 -41 20 54 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 7.0] Data for the target star ------------------------ * name: TYC 4947-00852-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 27 02.5564 DE: -06 14 22.043 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .023 ) * V mag [mag]: 9.8 * B mag [mag]: 11.0 * Apparent position with proper motion RA(deg): 186.8743327705 DE(deg): -6.2886346889 * Equation of equinoxes (radians) : 0.000039539179752 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (510) Mabella approx. diameter [km]: 57 approx. diameter ["]: .048 distance from Earth [AU]: 1.62800 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 858 number of rejected observations: 107 time covered by the observations: 1903 May 20 - 2008 Jan 23 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.018, 104° remarks: * orbital elements for (510) Mabella : Mean anomaly = 279.50757067 deg Arg. of pericenter = 91.12353803 deg Long. of node = 202.86790727 deg Inclination = 9.52164700 deg Eccentricity = 0.19289306 Semimajor axis = 2.60884438 AU Perihelion dist = 2.10561640 AU Mag: H = 9.65, G = 0.15 Epoch of elements : MJD 54561.67000000 TDT (2008 Apr 05.670) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 5 510 Mabella 16h 5.1m UT 9.8 12 27 2.556- 6 14 22.04TYC 4947-00852-1 11.0 13.2 57 4.6 1.628 -2.016 22.84 111.1475 -6.246 -60.64 6.39 16.0856 -0.03753 -0.04928 -5.56387 4.22797 0.00080 -0.00002 2000 279.1169572008 4 4.00000 91.123538202.867907 9.5216470.19289306 2.6088444 2.1056164 9.7 5.00.15 RATE 2.3390080 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.029 98 1.62 0.030 0 54532.5020080405_0852-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 07, 15:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org