IOTA/IOTA-ES occultation update for (52) Europa / TYC 6310-02174-1 event on 2007 Nov 03, 16:34 UT Visible from Africa, Madagascar Summary ------- On 2007 Nov 03 UT, the 302 km diameter asteroid (52) Europa will occult a 11.2 mag star in the constellation Sagittarius for observers along a path across Africa, Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 12.6 mag (the magnitude of the asteroid) for at most 12.2 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: 99 * date and approx. time of event: 2007 Nov 03, 16:30 - 2007 Nov 03, 16:38 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 12.2 * Moon: 32 % sunlit, 140° distance * Sun: 71° distance * rough path description: Africa, Madagascar The occultation path -------------------- * approximate projected width [km]: 302 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .024", 90° ) * approx speed of asteroid's shadow [km/s]: 24.8132 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6310-02174-1 by 52 Europa on 2007 Nov 03 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 ' " Latitude Latitude Latitude Latitude - 89 0 0 .. .. .. .. .. .. .. .. .. - 6 16 27 .. .. .. - 6 53 32 .. .. .. - 88 0 0 - 5 12 5 16 30 9 1 112 71 - 6 40 16 - 3 43 58 - 7 17 20 .. .. .. - 87 0 0 - 5 35 50 16 30 9 2 111 72 - 7 3 58 - 4 7 46 - 7 41 1 - 3 30 46 - 86 0 0 - 5 59 30 16 30 9 3 111 73 - 7 27 35 - 4 31 28 - 8 4 36 - 3 54 29 - 85 0 0 - 6 23 2 16 30 10 4 111 74 - 7 51 4 - 4 55 3 - 8 28 4 - 4 18 6 - 84 0 0 - 6 46 27 16 30 10 5 111 75 - 8 14 26 - 5 18 31 - 8 51 25 - 4 41 36 - 83 0 0 - 7 9 44 16 30 10 6 111 76 - 8 37 40 - 5 41 52 - 9 14 37 - 5 4 58 - 82 0 0 - 7 32 54 16 30 11 7 111 77 - 9 0 45 - 6 5 5 - 9 37 41 - 5 28 12 - 81 0 0 - 7 55 54 16 30 12 8 111 78 - 9 23 41 - 6 28 9 -10 0 36 - 5 51 18 - 80 0 0 - 8 18 45 16 30 12 9 111 79 - 9 46 28 - 6 51 4 -10 23 20 - 6 14 15 - 79 0 0 - 8 41 25 16 30 13 10 110 80 -10 9 5 - 7 13 49 -10 45 55 - 6 37 2 - 78 0 0 - 9 3 56 16 30 14 11 110 81 -10 31 31 - 7 36 25 -11 8 19 - 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Data for the target star ------------------------ * name: TYC 6310-02174-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 33 08.9410 DE: -21 33 34.250 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 11.2 * B mag [mag]: 11.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (52) Europa approx. diameter [km]: 302 approx. diameter ["]: .116 distance from Earth [AU]: 3.60300 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1598 number of rejected observations: 197 time covered by the observations: 1902 Apr 14 - 2007 Oct 01 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.007, 89° remarks: * orbital elements for (52) Europa : Mean anomaly = 198.12813884 deg Arg. of pericenter = 343.96823556 deg Long. of node = 128.75129257 deg Inclination = 7.48008997 deg Eccentricity = 0.10521723 Semimajor axis = 3.09650999 AU Perihelion dist = 2.77070379 AU Mag: H = 6.37, G = 0.18 Epoch of elements : MJD 54407.69100000 TDT (2007 Nov 03.691) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 03 52 Europa 16h 34.4m UT 11.2 19 33 8.941-21 33 34.25TYC 6310-02174-1 11.8 12.6 302 12.2 3.603 2.443 2.56 2.124 -21.560 -72.71 -15.09 16.5738 -.00007 -.01732 13.96590 1.04960 0.00559 0.00090 2000 196.73697520071027.00000343.968236128.751293 7.4800900.105217233.096509992.770703796.315 0.18 RATE 1.8088200 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.024 0.024 89.9 1.210 0.024 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org