IOTA/IOTA-ES occultation update for (688) Melanie / TYC 0746-00977-1 event on 2012 Dec 15, 22:57 UT Visible from SW Asia, Europe Summary ------- On 2012 Dec 15 UT, the 49 km diameter asteroid (688) Melanie will occult a 9.2 mag star in the constellation Monoceros for observers along a path across SW Asia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.9 mag to 15.0 mag (the magnitude of the asteroid) for at most 3.7 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 Dec 15, 22:50 - 2012 Dec 15, 23:03 UT * geocentric midpoint of event [JD]: 2456277.45641667 * magnitude of target star: 9.2 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 3.7 * Moon: 10 % sunlit, 158° distance * Sun: 158° distance * rough path description: SW Asia, Europe The occultation path -------------------- * approximate projected width [km]: 61 * 1 sigma uncertainty interval [path widths]: +/- 0.95 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .031", 89° ) * approx speed of asteroid's shadow [km/s]: 13.1275 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0746-00977-1 by 688 Melanie on 2012 Dec 15 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 - 66 0 0 37 8 39 23 3 41 1 80 -22 37 25 33 36 51 50 37 57 49 .. .. .. - 65 0 0 37 17 41 23 3 41 2 81 -23 37 34 34 37 0 51 38 6 51 .. .. .. - 64 0 0 37 26 42 23 3 41 2 81 -24 37 43 35 37 9 52 38 15 51 .. .. .. - 63 0 0 37 35 41 23 3 40 3 82 -25 37 52 35 37 18 52 38 24 51 .. .. .. - 62 0 0 37 44 40 23 3 40 4 82 -25 38 1 33 37 27 50 38 33 49 36 56 2 - 61 0 0 37 53 36 23 3 39 5 83 -26 38 10 30 37 36 47 38 42 46 37 4 59 - 60 0 0 38 2 32 23 3 38 6 84 -27 38 19 25 37 45 42 38 51 41 37 13 54 - 59 0 0 38 11 25 23 3 37 6 84 -28 38 28 18 37 54 35 39 0 34 37 22 48 - 58 0 0 38 20 16 23 3 36 7 85 -29 38 37 10 38 3 27 39 9 25 37 31 39 - 57 0 0 38 29 6 23 3 35 8 85 -29 38 45 59 38 12 16 39 18 15 37 40 29 - 56 0 0 38 37 53 23 3 34 9 86 -30 38 54 46 38 21 4 39 27 1 37 49 16 - 55 0 0 38 46 38 23 3 33 10 87 -31 39 3 31 38 29 48 39 35 46 37 58 1 - 54 0 0 38 55 20 23 3 31 10 87 -32 39 12 13 38 38 30 39 44 28 38 6 43 - 53 0 0 39 3 59 23 3 30 11 88 -33 39 20 52 38 47 10 39 53 7 38 15 23 - 52 0 0 39 12 36 23 3 28 12 89 -33 39 29 28 38 55 47 40 1 43 38 24 0 - 51 0 0 39 21 9 23 3 26 13 89 -34 39 38 2 39 4 20 40 10 16 38 32 34 - 50 0 0 39 29 39 23 3 24 13 90 -35 39 46 32 39 12 51 40 18 46 38 41 4 - 49 0 0 39 38 6 23 3 22 14 91 -36 39 54 59 39 21 18 40 27 13 38 49 32 - 48 0 0 39 46 30 23 3 20 15 91 -36 40 3 22 39 29 42 40 35 36 38 57 56 - 47 0 0 39 54 50 23 3 18 16 92 -37 40 11 42 39 38 2 40 43 56 39 6 16 - 46 0 0 40 3 7 23 3 16 16 93 -38 40 19 58 39 46 18 40 52 12 39 14 33 - 45 0 0 40 11 19 23 3 13 17 93 -39 40 28 11 39 54 31 41 0 24 39 22 46 - 44 0 0 40 19 28 23 3 11 18 94 -39 40 36 19 40 2 40 41 8 32 39 30 55 - 43 0 0 40 27 32 23 3 8 19 95 -40 40 44 24 40 10 45 41 16 36 39 39 0 - 42 0 0 40 35 33 23 3 6 19 95 -41 40 52 24 40 18 45 41 24 36 39 47 1 - 41 0 0 40 43 29 23 3 3 20 96 -42 41 0 20 40 26 41 41 32 31 39 54 58 - 40 0 0 40 51 20 23 3 0 21 97 -42 41 8 11 40 34 33 41 40 22 40 2 50 - 39 0 0 40 59 7 23 2 57 22 98 -43 41 15 58 40 42 20 41 48 9 40 10 37 - 38 0 0 41 6 50 23 2 54 22 98 -44 41 23 40 40 50 3 41 55 50 40 18 20 - 37 0 0 41 14 27 23 2 51 23 99 -45 41 31 17 40 57 41 42 3 27 40 25 59 - 36 0 0 41 22 0 23 2 48 24 100 -45 41 38 50 41 5 14 42 10 59 40 33 32 - 35 0 0 41 29 28 23 2 45 25 101 -46 41 46 17 41 12 42 42 18 26 40 41 0 - 34 0 0 41 36 50 23 2 41 25 101 -47 41 53 40 41 20 4 42 25 48 40 48 23 - 33 0 0 41 44 8 23 2 38 26 102 -47 42 0 57 41 27 22 42 33 5 40 55 42 - 32 0 0 41 51 20 23 2 34 27 103 -48 42 8 9 41 34 34 42 40 17 41 2 54 - 31 0 0 41 58 27 23 2 31 27 104 -49 42 15 15 41 41 41 42 47 23 41 10 2 - 30 0 0 42 5 28 23 2 27 28 105 -50 42 22 16 41 48 43 42 54 23 41 17 4 - 29 0 0 42 12 24 23 2 23 29 105 -50 42 29 12 41 55 39 43 1 18 41 24 0 - 28 0 0 42 19 14 23 2 20 29 106 -51 42 36 2 42 2 29 43 8 8 41 30 51 - 27 0 0 42 25 58 23 2 16 30 107 -52 42 42 46 42 9 14 43 14 51 41 37 36 - 26 0 0 42 32 36 23 2 12 31 108 -52 42 49 24 42 15 53 43 21 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Uncertainty in time = +/- 4 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0746-00977-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 40 37.9326 DE: +08 29 59.785 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .026 ) * V mag [mag]: 9.2 * B mag [mag]: 9.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (688) Melanie approx. diameter [km]: 49 approx. diameter ["]: .033 distance from Earth [AU]: 2.04500 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1067 number of rejected observations: 64 time covered by the observations: 1913 Jul 02 - 2012 Nov 08 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.017, 89° remarks: * orbital elements for (688) Melanie : Mean anomaly = 134.04398123 deg Arg. of pericenter = 139.70688846 deg Long. of node = 170.97093562 deg Inclination = 10.23743658 deg Eccentricity = 0.13798782 Semimajor axis = 2.69995745 AU Perihelion dist = 2.32739620 AU Mag: H = 10.67, G = 0.15 Epoch of elements : MJD 56276.95600000 TDT (2012 Dec 15.956) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 15 688 Melanie 22h 57.2m UT 9.2 6 40 37.933 8 29 59.78TYC 0746-00977-1 9.3 15.0 49 3.7 2.045 -2.148 0.18 30.8501 8.501 -165.41 -23.32 22.9540 0.00161 0.60083 -7.40941 0.03924 -0.00155 0.00157 2000 132.498626201212 9.00000139.706888170.970936 10.2374370.13798782 2.6999575 2.327396210.6 5.00.15 RATE 2.2216140 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.031 89 1.95 0.031 0 0-4 5 056264.0020121215_0977-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 10:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org