IOTA/IOTA-ES occultation update for (639) Latona / TYC 1171-00569-1 event on 2008 Jan 03, 17:52 UT Visible from Africa Summary ------- On 2008 Jan 03 UT, the 71 km diameter asteroid (639) Latona will occult a 11.1 mag star in the constellation Pegasus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 13.6 mag (the magnitude of the asteroid) for at most 3.0 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: 71 * date and approx. time of event: 2008 Jan 03, 17:48 - 2008 Jan 03, 17:56 UT * midpoint of event [JD]: 2454469.24464167 * magnitude of target star: 11.1 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 3.0 * Moon: 20 % sunlit, 133° distance * Sun: 80° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.82 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .028", 86° ) * approx speed of asteroid's shadow [km/s]: 23.7365 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1171-00569-1 by 639 Latona on 2008 Jan 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 - 94 0 0 -36 11 51 17 48 9 1 79 75 -36 33 3 -35 50 43 -37 7 55 .. .. .. - 93 0 0 -36 2 28 17 48 9 2 78 75 -36 23 40 -35 41 18 -36 58 34 .. .. .. - 92 0 0 -35 52 49 17 48 10 2 78 76 -36 14 3 -35 31 39 -36 48 59 .. .. .. - 91 0 0 -35 42 57 17 48 10 3 77 76 -36 4 12 -35 21 46 -36 39 9 -34 47 8 - 90 0 0 -35 32 51 17 48 10 4 77 77 -35 54 7 -35 11 38 -36 29 6 -34 36 58 - 89 0 0 -35 22 30 17 48 10 5 76 77 -35 43 47 -35 1 17 -36 18 49 -34 26 35 - 88 0 0 -35 11 56 17 48 11 6 75 77 -35 33 14 -34 50 42 -36 8 17 -34 15 58 - 87 0 0 -35 1 8 17 48 11 7 75 78 -35 22 27 -34 39 52 -35 57 32 -34 5 7 - 86 0 0 -34 50 6 17 48 12 7 74 78 -35 11 26 -34 28 49 -35 46 33 -33 54 2 - 85 0 0 -34 38 51 17 48 12 8 74 78 -35 0 12 -34 17 33 -35 35 21 -33 42 44 - 84 0 0 -34 27 22 17 48 13 9 73 78 -34 48 44 -34 6 2 -35 23 55 -33 31 12 - 83 0 0 -34 15 39 17 48 14 10 73 78 -34 37 3 -33 54 19 -35 12 15 -33 19 26 - 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Data for the target star ------------------------ * name: TYC 1171-00569-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 54 04.0775 DE: +08 28 28.178 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .035, .026 ) * V mag [mag]: 11.1 * B mag [mag]: 12.2 * Apparent position with proper motion RA(deg): 358.6199977744 DE(deg): 8.5202997360 * Equation of equinoxes (radians) : 0.000038832359441 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (639) Latona approx. diameter [km]: 71 approx. diameter ["]: .035 distance from Earth [AU]: 2.75800 * orbital information: orbit source: Preston date of fit: 2007 Nov 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 595 number of rejected observations: 102 time covered by the observations: 1907 Jul 20 - 2007 Nov 06 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.011, 64° remarks: * orbital elements for (639) Latona : Mean anomaly = 28.59106725 deg Arg. of pericenter = 67.67662041 deg Long. of node = 280.09621943 deg Inclination = 8.57678012 deg Eccentricity = 0.10238693 Semimajor axis = 3.01777137 AU Perihelion dist = 2.70879103 AU Mag: H = 8.11, G = 0.15 Epoch of elements : MJD 54468.74500000 TDT (2008 Jan 03.745) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 03 639 Latona 17h 52.3m UT 11.1 23 54 4.078 8 28 28.18TYC 1171-00569-1 12.2 13.6 71 3.0 2.758 2.793 10.39 347.712 8.471 273.03 -22.83 17.8714 .09253 -.37163 12.99562 3.25695 0.00531 0.00250 2000 26.946943720071226.00000 67.676620280.096219 8.5767800.102386933.017771372.708791038.205 0.15 RATE 1.8800724 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.038 0.028 85.6 1.820 0.029 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Nov 24, 17:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org