IOTA/IOTA-ES occultation update for (56) Melete / HIP 117016 event on 2012 Oct 15, 01:22 UT Visible from Africa Summary ------- On 2012 Oct 15 UT, the 134 km diameter asteroid (56) Melete will occult a 8.2 mag star in the constellation Pisces 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 3.3 mag to 11.4 mag (the magnitude of the asteroid) for at most 20.1 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: . The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2012 Oct 15, 01:09 - 2012 Oct 15, 01:36 UT * geocentric midpoint of event [JD]: 2456215.55770833 * magnitude of target star: 8.2 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 20.1 * Moon: 0 % sunlit, 159° distance * Sun: 154° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 151 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .020", 79° ) * approx speed of asteroid's shadow [km/s]: 6.6733 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 117016 by 56 Melete on 2012 Oct 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 ' " Longitude Longitude Longitude Longitude 36 11 2 24 0 0 1 9 8 8 266 -34 31 41 27 ... .. .. 30 16 7 ... .. .. 30 6 1 23 0 0 1 9 27 13 264 -39 27 4 3 33 54 48 25 59 6 35 52 12 Latitude Latitude Latitude Latitude 29 0 0 22 45 45 1 9 31 14 264 -40 23 27 19 22 3 55 23 43 53 21 47 6 28 0 0 22 31 53 1 9 36 15 263 -41 23 13 35 21 49 54 23 30 12 21 33 3 27 0 0 22 17 8 1 9 41 16 263 -42 22 58 59 21 35 1 23 15 40 21 18 5 26 0 0 22 1 30 1 9 46 17 263 -43 22 43 30 21 19 13 23 0 14 21 2 14 25 0 0 21 44 58 1 9 51 18 262 -44 22 27 8 21 2 31 22 43 56 20 45 28 24 0 0 21 27 32 1 9 57 19 262 -45 22 9 53 20 44 55 22 26 45 20 27 47 23 0 0 21 9 11 1 10 3 20 262 -46 21 51 43 20 26 23 22 8 39 20 9 11 22 0 0 20 49 56 1 10 9 21 262 -47 21 32 39 20 6 56 21 49 40 19 49 39 21 0 0 20 29 44 1 10 16 22 261 -48 21 12 40 19 46 32 21 29 45 19 29 10 20 0 0 20 8 37 1 10 23 23 261 -49 20 51 45 19 25 11 21 8 55 19 7 44 19 0 0 19 46 32 1 10 30 24 261 -50 20 29 54 19 2 53 20 47 10 18 45 21 18 0 0 19 23 30 1 10 38 25 261 -51 20 7 6 18 39 37 20 24 27 18 21 59 17 0 0 18 59 30 1 10 46 26 260 -52 19 43 20 18 15 22 20 0 47 17 57 38 16 0 0 18 34 31 1 10 54 27 260 -53 19 18 36 17 50 8 19 36 9 17 32 18 15 0 0 18 8 33 1 11 2 28 260 -53 18 52 54 17 23 54 19 10 33 17 5 57 14 0 0 17 41 35 1 11 11 29 260 -54 18 26 12 16 56 39 18 43 58 16 38 35 13 0 0 17 13 36 1 11 21 30 260 -55 17 58 30 16 28 23 18 16 22 16 10 12 12 0 0 16 44 36 1 11 31 31 260 -56 17 29 47 15 59 5 17 47 46 15 40 47 11 0 0 16 14 33 1 11 41 32 260 -57 17 0 3 15 28 43 17 18 9 15 10 18 10 0 0 15 43 27 1 11 51 33 260 -58 16 29 16 14 57 18 16 47 30 14 38 45 9 0 0 15 11 18 1 12 2 34 260 -59 15 57 26 14 24 49 16 15 48 14 6 8 8 0 0 14 38 4 1 12 13 35 260 -60 15 24 32 13 51 15 15 43 2 13 32 25 7 0 0 14 3 45 1 12 25 36 260 -61 14 50 34 13 16 35 15 9 12 12 57 36 6 0 0 13 28 21 1 12 37 37 260 -62 14 15 31 12 40 48 14 34 17 12 21 41 5 0 0 12 51 49 1 12 50 38 260 -63 13 39 22 12 3 54 13 58 17 11 44 37 4 0 0 12 14 10 1 13 3 39 260 -64 13 2 6 11 25 52 13 21 10 11 6 26 3 0 0 11 35 24 1 13 16 40 260 -65 12 23 42 10 46 41 12 42 56 10 27 5 2 0 0 10 55 28 1 13 30 41 260 -66 11 44 11 10 6 20 12 3 34 9 46 34 1 0 0 10 14 23 1 13 44 42 261 -67 11 3 31 9 24 50 11 23 3 9 4 53 0 0 0 9 32 8 1 13 58 43 261 -68 10 21 41 8 42 8 10 41 24 8 22 1 - 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43 0 0 -37 58 9 1 29 44 52 348 -41 -36 39 23 -39 19 0 -36 8 25 -39 51 59 - 44 0 0 -39 16 34 1 30 6 50 350 -39 -37 57 10 -40 38 8 -37 25 58 -41 11 25 - 45 0 0 -40 34 22 1 30 27 49 351 -38 -39 14 22 -41 56 34 -38 42 56 -42 30 8 - 46 0 0 -41 51 24 1 30 47 48 353 -36 -40 30 52 -43 14 12 -39 59 13 -43 48 1 - 47 0 0 -43 7 34 1 31 7 47 354 -35 -41 46 32 -44 30 55 -41 14 43 -45 4 57 - 48 0 0 -44 22 45 1 31 26 46 356 -34 -43 1 17 -45 46 34 -42 29 18 -46 20 48 - 49 0 0 -45 36 50 1 31 45 45 357 -32 -44 15 0 -47 1 3 -43 42 53 -47 35 28 - 50 0 0 -46 49 43 1 32 3 43 359 -31 -45 27 35 -48 14 16 -44 55 21 -48 48 49 - 51 0 0 -48 1 18 1 32 20 42 360 -30 -46 38 56 -49 26 6 -46 6 37 -50 0 45 - 52 0 0 -49 11 29 1 32 36 41 1 -28 -47 48 58 -50 36 27 -47 16 35 -51 11 10 - 53 0 0 -50 20 10 1 32 52 40 2 -27 -48 57 34 -51 45 13 -48 25 9 -52 19 59 - 54 0 0 -51 27 18 1 33 7 39 4 -26 -50 4 41 -52 52 20 -49 32 16 -53 27 6 - 55 0 0 -52 32 47 1 33 21 38 5 -24 -51 10 15 -53 57 44 -50 37 51 -54 32 28 - 56 0 0 -53 36 34 1 33 35 36 6 -23 -52 14 11 -55 1 21 -51 41 51 -55 36 0 - 57 0 0 -54 38 35 1 33 48 35 7 -22 -53 16 27 -56 3 7 -52 44 12 -56 37 39 - 58 0 0 -55 38 50 1 34 0 34 8 -21 -54 16 59 -57 3 1 -53 44 51 -57 37 25 - 59 0 0 -56 37 14 1 34 12 33 9 -20 -55 15 46 -58 1 1 -54 43 47 -58 35 13 - 60 0 0 -57 33 48 1 34 23 32 10 -19 -56 12 47 -58 57 5 -55 40 58 -59 31 5 - 61 0 0 -58 28 31 1 34 33 31 11 -18 -57 8 1 -59 51 14 -56 36 23 -60 24 59 - 62 0 0 -59 21 22 1 34 43 30 12 -17 -58 1 26 -60 43 27 -57 30 1 -61 16 56 - 63 0 0 -60 12 22 1 34 52 29 13 -16 -58 53 4 -61 33 45 -58 21 53 -62 6 56 - 64 0 0 -61 1 31 1 35 0 28 14 -15 -59 42 54 -62 22 10 -59 11 59 -62 55 2 - 65 0 0 -61 48 52 1 35 8 28 15 -14 -60 30 59 -63 8 43 -60 0 20 -63 41 15 - 66 0 0 -62 34 25 1 35 16 27 16 -13 -61 17 18 -63 53 25 -60 46 57 -64 25 36 - 67 0 0 -63 18 13 1 35 23 26 17 -12 -62 1 55 -64 36 21 -61 31 52 -65 8 9 - 68 0 0 -64 0 18 1 35 30 25 18 -11 -62 44 50 -65 17 31 -62 15 7 -65 48 57 - 69 0 0 -64 40 43 1 35 36 24 19 -11 -63 26 7 -65 57 0 -62 56 43 -66 28 2 - 70 0 0 -65 19 30 1 35 42 24 20 -10 -64 5 47 -66 34 50 -63 36 43 -67 5 28 - 71 0 0 -65 56 42 1 35 47 23 21 -9 -64 43 54 -67 11 4 -64 15 11 -67 41 17 - 72 0 0 -66 32 23 1 35 52 22 22 -8 -65 20 29 -67 45 46 -64 52 7 -68 15 35 - 73 0 0 -67 6 35 1 35 57 21 23 -8 -65 55 37 -68 19 0 -65 27 36 -68 48 23 - 74 0 0 -67 39 22 1 36 2 21 24 -7 -66 29 19 -68 50 47 -66 1 40 -69 19 46 - 75 0 0 -68 10 47 1 36 6 20 25 -6 -67 1 40 -69 21 13 -66 34 22 -69 49 46 - 76 0 0 -68 40 52 1 36 10 20 26 -6 -67 32 41 -69 50 19 -67 5 44 -70 18 28 - 77 0 0 -69 9 42 1 36 13 19 27 -5 -68 2 26 -70 18 10 -67 35 50 -70 45 55 - 78 0 0 -69 37 19 1 36 17 18 28 -5 -68 30 57 -70 44 49 -68 4 43 -71 12 10 - 79 0 0 -70 3 46 1 36 20 18 28 -4 -68 58 18 -71 10 19 -68 32 25 -71 37 15 - 80 0 0 -70 29 6 1 36 23 17 29 -4 -69 24 32 -71 34 42 -68 58 59 -72 1 15 - 81 0 0 -70 53 22 1 36 26 17 30 -3 -69 49 41 -71 58 3 -69 24 28 -72 24 13 - 82 0 0 -71 16 36 1 36 29 16 31 -3 -70 13 47 -72 20 23 -69 48 55 -72 46 10 - 83 0 0 -71 38 52 1 36 31 16 32 -2 -70 36 54 -72 41 45 -70 12 21 -73 7 11 - 84 0 0 -72 0 12 1 36 34 15 33 -2 -70 59 4 -73 2 13 -70 34 51 -73 27 17 - 85 0 0 -72 20 38 1 36 36 15 34 -1 -71 20 19 -73 21 48 -70 56 25 -73 46 31 - 86 0 0 -72 40 13 1 36 38 14 35 -1 -71 40 42 -73 40 33 -71 17 6 -74 4 55 - 87 0 0 -72 58 59 1 36 40 14 36 0 -72 0 15 -73 58 30 -71 36 57 -74 22 32 Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: HIP 117016 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 43 17.8418 DE: -00 09 20.142 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .019, .014 ) * V mag [mag]: 8.2 * B mag [mag]: 8.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (56) Melete approx. diameter [km]: 134 approx. diameter ["]: .139 distance from Earth [AU]: 1.32700 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1113 number of rejected observations: 111 time covered by the observations: 1902 Mar 05 - 2012 Aug 29 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.014, 74° remarks: * orbital elements for (56) Melete : Mean anomaly = 46.16095410 deg Arg. of pericenter = 103.66156177 deg Long. of node = 193.42420602 deg Inclination = 8.07010310 deg Eccentricity = 0.23691357 Semimajor axis = 2.59605272 AU Perihelion dist = 1.98101260 AU Mag: H = 8.51, G = 0.15 Epoch of elements : MJD 56215.05800000 TDT (2012 Oct 15.058) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 15 56 Melete 1h 23.1m UT 8.2 23 43 17.842- 0 9 20.14HIP 117016 8.3 11.4 134 20.1 1.327 -1.030 -19.57 -48.9375 -0.151 155.67 -8.61 1.3850 0.36007 -0.28405 -2.33444 -2.95592 0.00228 0.00084 2000 44.96912920121010.00000103.661562193.424206 8.0701030.23691357 2.5960527 1.9810126 8.3 5.00.15 RATE 2.3563170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.020 79 1.20 0.027 0 0-2-2 056208.0020121015_117016 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org