IOTA/IOTA-ES occultation update for (779) Nina / TYC 1822-01088-1 event on 2009 Feb 03, 00:46 UT Visible from Summary ------- On 2009 Feb 03 UT, the 77 km diameter asteroid (779) Nina will occult a 11.5 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.3 mag (the magnitude of the asteroid) for at most 8.1 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: UCAC. The event at a glimpse ---------------------- * Rank: 83 * date and approx. time of event: 2009 Feb 03, 00:40 - 2009 Feb 03, 00:53 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 8.1 * Moon: 51 % sunlit, 18° distance * Sun: 110° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.64 * 1 sigma uncertainty interval [seconds]: +/- 6.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .026", 91° ) * approx speed of asteroid's shadow [km/s]: 9.4140 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1822-01088-1 by 779 Nina on 2009 Feb 3 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 104 5 4 63 6 46 0 40 2 0 6 -6 ... .. .. .. .. .. 106 6 1 68 22 55 ... .. .. .. .. .. 108 5 29 71 11 18 104 10 28 70 24 0 0 40 12 7 6 -9 102 56 8 67 51 47 105 28 31 72 15 32 ... .. .. .. .. .. 107 19 2 74 10 41 102 48 59 73 33 6 0 40 22 11 5 -10 101 44 2 71 54 38 104 2 14 74 57 39 100 30 48 69 11 25 105 50 25 76 32 12 100 41 46 75 56 44 0 40 32 13 3 -12 99 42 26 74 37 1 101 50 42 77 8 37 98 38 38 72 38 39 103 35 33 78 31 55 97 44 35 77 55 23 0 40 43 15 0 -13 96 53 18 76 45 42 98 45 57 78 59 50 96 0 8 75 6 36 100 22 23 80 16 6 93 46 23 79 36 23 0 40 53 17 357 -14 93 8 48 78 33 1 94 33 22 80 35 55 92 32 0 77 5 5 95 50 45 81 47 26 88 30 59 81 2 38 0 41 3 18 352 -15 88 16 38 80 3 46 88 51 43 81 58 35 88 5 48 78 43 22 89 30 20 83 6 33 81 38 32 82 14 48 0 41 13 19 345 -17 82 1 48 81 19 39 81 14 17 83 7 37 82 30 58 80 5 3 80 40 41 84 12 16 72 50 37 83 12 2 0 41 23 21 337 -18 74 10 29 82 20 36 71 16 3 84 1 20 75 37 41 81 11 19 68 43 17 85 1 36 62 3 18 83 52 22 0 41 33 22 326 -19 64 38 25 83 5 28 58 54 42 84 36 55 67 22 0 82 1 56 53 42 58 85 30 19 49 46 0 84 13 53 0 41 44 23 315 -20 53 43 20 83 32 49 45 0 8 84 51 53 57 53 26 82 36 9 37 21 10 85 35 23 37 7 26 84 15 59 0 41 54 24 302 -21 42 11 44 83 41 58 31 13 44 84 46 8 47 40 30 82 53 26 22 19 57 85 18 14 25 26 53 84 0 32 0 42 4 25 291 -22 31 5 42 83 33 59 19 10 56 84 22 47 37 26 47 82 54 17 10 19 31 84 44 21 15 34 3 83 31 15 0 42 14 26 282 -22 21 15 17 83 11 36 9 31 8 83 46 37 27 55 43 82 40 32 1 23 41 83 59 48 7 38 49 82 52 8 0 42 24 27 274 -23 13 2 8 82 38 17 2 5 47 83 2 3 19 35 27 82 14 51 - 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9 5 12 36 11 18 - 6 10 24 35 3 33 0 51 34 23 288 -71 - 5 12 29 34 58 33 - 7 6 41 35 7 39 - 3 55 46 34 50 43 - 8 16 34 35 11 42 - 5 16 41 34 0 34 0 51 45 22 288 -72 - 4 17 28 33 54 33 - 6 14 7 34 5 36 - 2 58 46 33 45 13 - 7 25 15 34 10 44 - 4 19 16 32 55 41 0 51 55 21 289 -73 - 3 18 23 32 48 27 - 5 18 8 33 1 48 - 1 57 8 32 37 20 - 6 30 51 33 8 11 - 3 17 26 31 48 31 0 52 5 20 290 -74 - 2 14 24 31 39 48 - 4 18 9 31 55 56 - 0 49 49 31 26 31 - 5 32 53 32 3 47 - 2 10 15 30 38 33 0 52 15 19 291 -74 - 1 4 23 30 28 2 - 3 13 22 30 47 34 0 24 39 30 11 57 - 4 30 41 30 57 11 - 0 56 23 29 25 5 0 52 25 17 292 -75 0 13 18 29 12 13 - 2 2 41 29 36 5 1 48 31 28 52 27 - 3 23 21 29 47 52 0 26 11 28 7 1 0 52 35 15 293 -75 1 41 16 27 50 59 - 0 44 29 28 20 39 3 25 37 27 25 58 - 2 9 40 28 35 12 2 0 44 26 42 37 0 52 46 14 294 -75 3 24 2 26 21 56 0 43 44 26 59 54 5 23 23 25 48 34 - 0 47 46 27 18 11 3 53 22 25 8 40 0 52 56 11 295 -75 5 30 53 24 40 8 2 26 14 25 31 36 8 0 53 23 50 12 0 45 18 25 55 15 6 18 10 23 17 43 0 53 6 9 296 -73 8 29 0 22 31 20 4 31 41 23 51 9 13 56 49 20 7 39 2 34 47 24 23 36 10 13 58 20 38 55 0 53 16 4 297 -70 ... .. .. .. .. .. 7 23 58 21 46 2 ... .. .. .. .. .. 4 52 11 22 37 12 Uncertainty in time = +/- 7 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 1822-01088-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 02 52.4423 DE: +27 02 40.218 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .036, .020 ) * V mag [mag]: 11.5 * B mag [mag]: 13.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (779) Nina approx. diameter [km]: 77 approx. diameter ["]: .047 distance from Earth [AU]: 2.25500 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 607 number of rejected observations: 84 time covered by the observations: 1916 Jul 29 - 2008 Oct 17 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.016, 94° remarks: * orbital elements for (779) Nina : Mean anomaly = 85.24563560 deg Arg. of pericenter = 48.77880068 deg Long. of node = 283.84004460 deg Inclination = 14.57817901 deg Eccentricity = 0.22400583 Semimajor axis = 2.66611691 AU Perihelion dist = 2.06889117 AU Mag: H = 7.87, G = 0.15 Epoch of elements : MJD 54865.03200000 TDT (2009 Feb 03.032) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 3 779 Nina 0h 46.6m UT 11.5 4 2 52.442 27 2 40.22TYC 1822-01088-1 13.6 13.3 77 8.1 2.255 1.301 -11.29 -84.2819 27.048 171.79 -16.53 0.7775 0.43951 0.67637 4.45429 -2.89708 0.00551 0.00088 2000 84.1063682009 129.00000 48.778801283.840045 14.5781790.22400583 2.6661169 2.0688912 8.3 5.00.15 RATE 2.2640460 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.026 91 1.64 0.030 0 54776.5020090203_1088-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 04:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org