IOTA/IOTA-ES occultation update for (779) Nina / TYC 1730-00444-1 event on 2012 Nov 21, 21:02 UT Visible from W Africa, NE Canada Summary ------- On 2012 Nov 21 UT, the 81 km diameter asteroid (779) Nina will occult a 11.6 mag star in the constellation Andromeda for observers along a path across W Africa, NE Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 11.9 mag (the magnitude of the asteroid) for at most 10.8 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: 98 * date and approx. time of event: 2012 Nov 21, 20:50 - 2012 Nov 21, 21:16 UT * geocentric midpoint of event [JD]: 2456253.37664583 * magnitude of target star: 11.6 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 10.8 * Moon: 63 % sunlit, 32° distance * Sun: 131° distance * rough path description: W Africa, NE Canada The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .022", 76° ) * approx speed of asteroid's shadow [km/s]: 7.5619 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1730-00444-1 by 779 Nina on 2012 Nov 21 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 23 54 23 -58 0 0 21 16 18 1 324 -11 23 3 44 24 45 27 22 26 30 25 23 32 22 35 31 -57 0 0 21 16 18 2 325 -12 21 46 50 23 24 35 21 11 1 24 1 8 21 21 28 -56 0 0 21 16 17 3 326 -13 20 34 33 22 8 43 20 0 2 22 43 53 20 11 43 -55 0 0 21 16 16 4 327 -14 19 26 25 20 57 18 18 53 4 21 31 13 19 5 48 -54 0 0 21 16 14 6 328 -14 18 21 59 19 49 53 17 49 43 20 22 40 18 3 23 -53 0 0 21 16 13 7 329 -15 17 20 55 18 46 4 16 49 38 19 17 49 17 4 6 -52 0 0 21 16 10 8 330 -16 16 22 53 17 45 30 15 52 31 18 16 17 16 7 40 -51 0 0 21 16 8 9 331 -17 15 27 37 16 47 54 14 58 6 17 17 48 15 13 50 -50 0 0 21 16 5 10 331 -17 14 34 52 15 52 59 14 6 7 16 22 4 14 22 24 -49 0 0 21 16 2 11 332 -18 13 44 25 15 0 32 13 16 24 15 28 51 13 33 8 -48 0 0 21 15 59 12 333 -19 12 56 5 14 10 19 12 28 45 14 37 56 12 45 53 -47 0 0 21 15 55 14 333 -19 12 9 42 13 22 11 11 43 0 13 49 8 12 0 28 -46 0 0 21 15 51 15 334 -20 11 25 6 12 35 58 10 59 0 13 2 18 11 16 46 -45 0 0 21 15 46 16 334 -21 10 42 10 11 51 29 10 16 37 12 17 15 10 34 39 -44 0 0 21 15 42 17 335 -21 10 0 46 11 8 39 9 35 44 11 33 52 9 54 0 -43 0 0 21 15 37 18 335 -22 9 20 46 10 27 19 8 56 14 10 52 1 9 14 42 -42 0 0 21 15 32 19 336 -23 8 42 6 9 47 22 8 18 2 10 11 36 8 36 39 -41 0 0 21 15 26 20 336 -23 8 4 39 9 8 44 7 41 1 9 32 31 7 59 48 -40 0 0 21 15 20 21 337 -24 7 28 21 8 31 18 7 5 8 8 54 40 7 24 1 -39 0 0 21 15 14 23 337 -25 6 53 7 7 55 0 6 30 17 8 17 58 6 49 17 -38 0 0 21 15 8 24 337 -25 6 18 52 7 19 45 5 56 24 7 42 20 6 15 29 -37 0 0 21 15 1 25 338 -26 5 45 32 6 45 29 5 23 25 7 7 43 5 42 35 -36 0 0 21 14 54 26 338 -26 5 13 5 6 12 8 4 51 17 6 34 2 5 10 30 -35 0 0 21 14 47 27 339 -27 4 41 26 5 39 38 4 19 56 6 1 13 4 39 13 -34 0 0 21 14 39 28 339 -27 4 10 32 5 7 56 3 49 20 5 29 13 4 8 39 -33 0 0 21 14 32 29 339 -28 3 40 21 4 37 0 3 19 26 4 58 0 3 38 46 -32 0 0 21 14 24 30 340 -29 3 10 49 4 6 45 2 50 10 4 27 29 3 9 31 -31 0 0 21 14 15 31 340 -29 2 41 55 3 37 10 2 21 30 3 57 39 2 40 53 -30 0 0 21 14 7 32 340 -30 2 13 35 3 8 12 1 53 25 3 28 26 2 12 47 -29 0 0 21 13 58 34 341 -30 1 45 48 2 39 48 1 25 51 2 59 49 1 45 14 -28 0 0 21 13 49 35 341 -31 1 18 31 2 11 57 0 58 47 2 31 45 1 18 9 -27 0 0 21 13 40 36 341 -31 0 51 43 1 44 36 0 32 10 2 4 12 0 51 32 -26 0 0 21 13 31 37 341 -31 0 25 21 1 17 44 0 5 59 1 37 8 0 25 20 -25 0 0 21 13 21 38 342 -32 - 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83 0 0 59 41 34 20 50 18 30 91 -1 59 19 32 60 3 34 59 3 13 60 19 51 - 84 0 0 59 43 41 20 50 14 29 90 0 59 21 41 60 5 40 59 5 23 60 21 55 Uncertainty in time = +/- 4 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1730-00444-1 * constellation : Andromeda * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 15 52.7600 DE: +24 53 28.871 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 11.6 * B mag [mag]: 12.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (779) Nina approx. diameter [km]: 81 approx. diameter ["]: .074 distance from Earth [AU]: 1.50300 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 773 number of rejected observations: 85 time covered by the observations: 1916 Jul 29 - 2012 Oct 28 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.012, 63° remarks: * orbital elements for (779) Nina : Mean anomaly = 39.09380331 deg Arg. of pericenter = 49.08398570 deg Long. of node = 283.79645486 deg Inclination = 14.57572362 deg Eccentricity = 0.22370756 Semimajor axis = 2.66611047 AU Perihelion dist = 2.06968139 AU Mag: H = 7.87, G = 0.15 Epoch of elements : MJD 56252.87700000 TDT (2012 Nov 21.877) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 21 779 Nina 21h 2.4m UT 11.6 0 15 52.760 24 53 28.87TYC 1730-00444-1 12.6 11.9 81 10.8 1.503 0.822 -22.33 -12.8853 24.897 -139.07 -20.14 21.0395 -0.10091 -0.05040 1.90739 -3.81823 0.00430 0.00045 2000 38.44243520121119.00000 49.083986283.796455 14.5757240.22370756 2.6661105 2.0696814 8.3 5.00.15 RATE 2.2640540 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.022 76 1.37 0.027 0 0 0 1 056247.0020121121_0444-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org