IOTA/IOTA-ES occultation update for (795) Fini / TYC 4969-00722-1 event on 2012 Dec 17, 22:04 UT Visible from SE Asia, India Summary ------- On 2012 Dec 17 UT, the 79 km diameter asteroid (795) Fini will occult a 10.3 mag star in the constellation Virgo for observers along a path across SE Asia, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 15.1 mag (the magnitude of the asteroid) for at most 2.6 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: 74 * date and approx. time of event: 2012 Dec 17, 22:01 - 2012 Dec 17, 22:03 UT * geocentric midpoint of event [JD]: 2456279.41983333 * magnitude of target star: 10.3 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 2.6 * Moon: 27 % sunlit, 125° distance * Sun: 64° distance * rough path description: SE Asia, India The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.78 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .030", 112° ) * approx speed of asteroid's shadow [km/s]: 31.1167 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4969-00722-1 by 795 Fini on 2012 Dec 17 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 58 0 0 20 41 47 22 1 11 1 95 -63 20 20 1 21 3 33 19 46 0 21 37 26 59 0 0 20 36 34 22 1 11 2 95 -62 20 14 46 20 58 20 19 40 43 21 32 15 60 0 0 20 30 50 22 1 12 3 96 -61 20 9 1 20 52 38 19 34 57 21 26 35 61 0 0 20 24 36 22 1 12 4 96 -60 20 2 46 20 46 25 19 28 39 21 20 24 62 0 0 20 17 52 22 1 12 5 96 -59 19 56 0 20 39 42 19 21 51 21 13 43 63 0 0 20 10 37 22 1 12 6 97 -58 19 48 44 20 32 29 19 14 32 21 6 32 64 0 0 20 2 52 22 1 13 7 97 -57 19 40 57 20 24 45 19 6 43 20 58 51 65 0 0 19 54 36 22 1 13 7 97 -56 19 32 39 20 16 31 18 58 23 20 50 39 66 0 0 19 45 49 22 1 14 8 98 -55 19 23 51 20 7 46 18 49 32 20 41 58 67 0 0 19 36 32 22 1 14 9 98 -54 19 14 32 19 58 31 18 40 10 20 32 45 68 0 0 19 26 45 22 1 15 10 98 -53 19 4 42 19 48 45 18 30 17 20 23 3 69 0 0 19 16 26 22 1 15 11 99 -52 18 54 22 19 38 29 18 19 53 20 12 50 70 0 0 19 5 37 22 1 16 12 99 -51 18 43 30 19 27 42 18 8 58 20 2 6 71 0 0 18 54 17 22 1 17 13 99 -50 18 32 8 19 16 24 17 57 32 19 50 51 72 0 0 18 42 25 22 1 18 14 100 -50 18 20 14 19 4 35 17 45 35 19 39 6 73 0 0 18 30 3 22 1 19 15 100 -49 18 7 50 18 52 15 17 33 6 19 26 51 74 0 0 18 17 10 22 1 20 16 100 -48 17 54 54 18 39 25 17 20 7 19 14 4 75 0 0 18 3 46 22 1 21 17 100 -47 17 41 27 18 26 3 17 6 36 19 0 46 76 0 0 17 49 51 22 1 22 18 101 -46 17 27 29 18 12 11 16 52 33 18 46 58 77 0 0 17 35 24 22 1 23 19 101 -45 17 13 0 17 57 47 16 37 59 18 32 39 78 0 0 17 20 27 22 1 24 20 101 -44 16 57 59 17 42 52 16 22 54 18 17 49 79 0 0 17 4 58 22 1 25 21 102 -43 16 42 27 17 27 26 16 7 18 18 2 27 80 0 0 16 48 58 22 1 27 22 102 -42 16 26 24 17 11 29 15 51 10 17 46 35 81 0 0 16 32 26 22 1 28 23 102 -41 16 9 50 16 55 1 15 34 31 17 30 12 82 0 0 16 15 24 22 1 29 24 102 -40 15 52 44 16 38 2 15 17 20 17 13 17 83 0 0 15 57 50 22 1 31 25 103 -39 15 35 7 16 20 31 14 59 38 16 55 52 84 0 0 15 39 45 22 1 33 26 103 -38 15 16 59 16 2 30 14 41 24 16 37 55 85 0 0 15 21 9 22 1 34 27 103 -37 14 58 19 15 43 57 14 22 39 16 19 28 86 0 0 15 2 2 22 1 36 28 103 -36 14 39 9 15 24 53 14 3 23 16 0 30 87 0 0 14 42 23 22 1 38 29 104 -35 14 19 27 15 5 18 13 43 36 15 41 0 88 0 0 14 22 14 22 1 40 30 104 -34 13 59 14 14 45 13 13 23 17 15 21 0 89 0 0 14 1 34 22 1 41 31 104 -32 13 38 30 14 24 36 13 2 27 15 0 29 90 0 0 13 40 22 22 1 43 32 104 -31 13 17 15 14 3 28 12 41 7 14 39 27 91 0 0 13 18 41 22 1 45 33 104 -30 12 55 29 13 41 50 12 19 15 14 17 55 92 0 0 12 56 28 22 1 48 34 104 -29 12 33 13 13 19 42 11 56 53 13 55 52 93 0 0 12 33 45 22 1 50 35 105 -28 12 10 26 12 57 2 11 34 0 13 33 19 94 0 0 12 10 32 22 1 52 36 105 -27 11 47 9 12 33 53 11 10 37 13 10 15 95 0 0 11 46 49 22 1 54 37 105 -26 11 23 22 12 10 14 10 46 44 12 46 42 96 0 0 11 22 36 22 1 57 39 105 -25 10 59 5 11 46 5 10 22 21 12 22 39 97 0 0 10 57 53 22 1 59 40 105 -24 10 34 19 11 21 26 9 57 28 11 58 6 98 0 0 10 32 41 22 2 2 41 105 -23 10 9 3 10 56 18 9 32 6 11 33 4 99 0 0 10 7 0 22 2 4 42 105 -22 9 43 17 10 30 40 9 6 15 11 7 33 100 0 0 9 40 50 22 2 7 43 105 -21 9 17 3 10 4 34 8 39 55 10 41 33 101 0 0 9 14 11 22 2 10 44 105 -20 8 50 21 9 38 0 8 13 6 10 15 5 102 0 0 8 47 5 22 2 12 45 105 -19 8 23 11 9 10 57 7 45 50 9 48 8 103 0 0 8 19 31 22 2 15 46 105 -18 7 55 33 8 43 27 7 18 5 9 20 44 104 0 0 7 51 29 22 2 18 47 105 -16 7 27 27 8 15 29 6 49 54 8 52 53 105 0 0 7 23 1 22 2 21 48 105 -15 6 58 55 7 47 5 6 21 16 8 24 34 106 0 0 6 54 7 22 2 24 49 105 -14 6 29 57 7 18 14 5 52 11 7 55 49 107 0 0 6 24 46 22 2 27 50 105 -13 6 0 33 6 48 58 5 22 41 7 26 39 108 0 0 5 55 1 22 2 30 52 104 -12 5 30 43 6 19 16 4 52 46 6 57 3 109 0 0 5 24 51 22 2 34 53 104 -11 5 0 29 5 49 10 4 22 26 6 27 2 110 0 0 4 54 16 22 2 37 54 104 -10 4 29 52 5 18 39 3 51 43 5 56 37 111 0 0 4 23 18 22 2 40 55 104 -9 3 58 50 4 47 45 3 20 36 5 25 49 112 0 0 3 51 58 22 2 44 56 103 -7 3 27 26 4 16 28 2 49 6 4 54 37 113 0 0 3 20 16 22 2 47 57 103 -6 2 55 40 3 44 49 2 17 15 4 23 3 114 0 0 2 48 12 22 2 51 58 103 -5 2 23 33 3 12 48 1 45 2 3 51 8 115 0 0 2 15 48 22 2 54 59 102 -4 1 51 6 2 40 28 1 12 30 3 18 52 116 0 0 1 43 4 22 2 58 60 102 -3 1 18 18 2 7 47 0 39 37 2 46 17 117 0 0 1 10 1 22 3 1 61 101 -2 0 45 13 1 34 47 0 6 27 2 13 22 118 0 0 0 36 40 22 3 5 63 101 -1 0 11 49 1 1 29 - 0 27 2 1 40 9 Uncertainty in time = +/- 2 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 4969-00722-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 30 08.2682 DE: -04 12 58.265 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .029 ) * V mag [mag]: 10.3 * B mag [mag]: 11.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (795) Fini approx. diameter [km]: 79 approx. diameter ["]: .039 distance from Earth [AU]: 2.76700 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 859 number of rejected observations: 52 time covered by the observations: 1917 Mar 16 - 2012 May 03 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.009, 132° remarks: * orbital elements for (795) Fini : Mean anomaly = 337.50573546 deg Arg. of pericenter = 190.85611685 deg Long. of node = 17.41270785 deg Inclination = 19.05956625 deg Eccentricity = 0.10171719 Semimajor axis = 2.74875702 AU Perihelion dist = 2.46916119 AU Mag: H = 9.82, G = 0.15 Epoch of elements : MJD 56278.92000000 TDT (2012 Dec 17.920) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 17 795 Fini 22h 4.6m UT 10.3 13 30 8.268- 4 12 58.27TYC 4969-00722-1 11.0 15.1 79 2.6 2.767 3.236 -27.80 144.4619 -4.209 -152.00 -23.39 22.0760 -0.07931 -0.13805 15.23057 -8.74609 -0.00482 0.00214 2000 335.576592201212 9.00000190.856117 17.412708 19.0595660.10171719 2.7487570 2.4691612 9.9 5.00.15 RATE 2.1627160 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.030 112 1.78 0.031 0 0 2 5 056264.0020121217_0722-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 05:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org