IOTA/IOTA-ES occultation update for (137) Meliboea / TYC 5143-02694-1 event on 2007 Oct 01, 18:53 UT Visible from Africa Summary ------- On 2007 Oct 01 UT, the 145 km diameter asteroid (137) Meliboea will occult a 11.3 mag star in the constellation Aquila 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 1.6 mag to 12.6 mag (the magnitude of the asteroid) for at most 9.9 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: 91 * date and approx. time of event: 2007 Oct 01, 18:46 - 2007 Oct 01, 19:01 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 9.9 * Moon: 68 % sunlit, 139° distance * Sun: 104° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 145 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .051) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .051", 89° ) * approx speed of asteroid's shadow [km/s]: 14.6175 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5143-02694-1 by 137 Meliboea on 2007 Oct 01 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 - 87 0 0 20 10 23 18 46 31 1 97 61 19 30 45 20 50 0 18 50 19 21 30 25 - 86 0 0 20 2 54 18 46 32 1 98 61 19 23 14 20 42 34 18 42 46 21 23 0 - 85 0 0 19 55 3 18 46 32 2 98 60 19 15 21 20 34 45 18 34 51 21 15 13 - 84 0 0 19 46 50 18 46 32 3 98 60 19 7 6 20 26 34 18 26 33 21 7 4 - 83 0 0 19 38 15 18 46 33 4 99 59 18 58 28 20 18 1 18 17 53 20 58 34 - 82 0 0 19 29 17 18 46 33 5 99 59 18 49 28 20 9 5 18 8 51 20 49 41 - 81 0 0 19 19 58 18 46 34 6 99 58 18 40 6 19 59 48 17 59 26 20 40 26 - 80 0 0 19 10 16 18 46 35 7 100 57 18 30 22 19 50 9 17 49 39 20 30 50 - 79 0 0 19 0 12 18 46 36 8 100 57 18 20 16 19 40 8 17 39 30 20 20 51 - 78 0 0 18 49 47 18 46 37 9 100 56 18 9 48 19 29 45 17 28 59 20 10 31 - 77 0 0 18 38 59 18 46 38 10 101 55 17 58 57 19 19 0 17 18 6 19 59 49 - 76 0 0 18 27 49 18 46 40 11 101 55 17 47 45 19 7 53 17 6 51 19 48 45 - 75 0 0 18 16 18 18 46 41 12 101 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Data for the target star ------------------------ * name: TYC 5143-02694-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 26 31.3718 DE: -06 43 11.419 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .048, .049 ) * V mag [mag]: 11.3 * B mag [mag]: 12.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (137) Meliboea approx. diameter [km]: 145 approx. diameter ["]: .100 distance from Earth [AU]: 1.99700 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 733 number of rejected observations: 107 time covered by the observations: 1906 Apr 12 - 2007 Sep 22 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.011, 80° remarks: * orbital elements for (137) Meliboea : Mean anomaly = 4.10355218 deg Arg. of pericenter = 106.78485696 deg Long. of node = 202.41746169 deg Inclination = 13.41519246 deg Eccentricity = 0.21898496 Semimajor axis = 3.11624671 AU Perihelion dist = 2.43383555 AU Mag: H = 8.00, G = 0.15 Epoch of elements : MJD 54374.78700000 TDT (2007 Oct 01.787) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 01 137 Meliboea 18h 53.8m UT 11.3 19 26 31.372- 6 43 11.42TYC 5143-02694-1 12.8 12.6 145 9.9 1.997 2.275 -13.10 -1.943 -6.716 -106.02 -3.26 18.8965 -.00600 -.01444 7.69462 -2.97725 0.00540 0.00046 2000 3.245882932007 927.00000106.784857202.417462 13.4151920.218984963.116246712.433835558.055 0.15 RATE 1.7916630 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.051 0.051 89.0 1.510 0.051 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org