IOTA/IOTA-ES occultation update for (867) Kovacia / TYC 1873-00493-1 event on 2012 Nov 27, 22:50 UT Visible from Africa Summary ------- On 2012 Nov 27 UT, the 25 km diameter asteroid (867) Kovacia will occult a 9.2 mag star in the constellation Taurus 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 6.1 mag to 15.3 mag (the magnitude of the asteroid) for at most 2.5 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: 28 * date and approx. time of event: 2012 Nov 27, 22:42 - 2012 Nov 27, 22:58 UT * geocentric midpoint of event [JD]: 2456259.45152917 * magnitude of target star: 9.2 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 2.5 * Moon: 100 % sunlit, 28° distance * Sun: 159° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 2.38 * 1 sigma uncertainty interval [seconds]: +/- 7.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .066 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .066", .043", 85° ) * approx speed of asteroid's shadow [km/s]: 9.8446 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1873-00493-1 by 867 Kovacia on 2012 Nov 27 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 - 42 0 0 -24 2 22 22 58 29 0 59 -20 -23 51 56 -24 12 49 .. .. .. .. .. .. - 41 0 0 -23 29 21 22 58 29 1 58 -21 -23 18 58 -23 39 45 .. .. .. -24 29 42 - 40 0 0 -22 56 52 22 58 29 2 58 -23 -22 46 33 -23 7 12 .. .. .. -23 56 53 - 39 0 0 -22 24 56 22 58 28 3 58 -24 -22 14 40 -22 35 13 .. .. .. -23 24 37 - 38 0 0 -21 53 34 22 58 27 5 57 -25 -21 43 22 -22 3 48 .. .. .. -22 52 55 - 37 0 0 -21 22 47 22 58 26 6 57 -26 -21 12 38 -21 32 57 -20 24 42 -22 21 49 - 36 0 0 -20 52 34 22 58 24 7 56 -27 -20 42 28 -21 2 42 -19 54 48 -21 51 17 - 35 0 0 -20 22 57 22 58 22 8 56 -28 -20 12 55 -20 33 1 -19 25 29 -21 21 21 - 34 0 0 -19 53 56 22 58 20 9 56 -29 -19 43 57 -20 3 57 -18 56 46 -20 52 2 - 33 0 0 -19 25 31 22 58 17 10 55 -30 -19 15 35 -19 35 29 -18 28 38 -20 23 19 - 32 0 0 -18 57 43 22 58 15 11 55 -31 -18 47 50 -19 7 38 -18 1 7 -19 55 13 - 31 0 0 -18 30 32 22 58 12 12 55 -32 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21 324 -13 -30 29 53 -30 51 46 -29 38 21 -31 44 28 77 0 0 -31 17 45 22 42 44 20 324 -12 -31 6 46 -31 28 46 -30 14 59 -32 21 44 78 0 0 -31 54 59 22 42 39 19 323 -11 -31 43 56 -32 6 3 -30 51 54 -32 59 17 79 0 0 -32 32 28 22 42 34 18 322 -10 -32 21 22 -32 43 35 -31 29 5 -33 37 6 80 0 0 -33 10 11 22 42 30 17 322 -9 -32 59 2 -33 21 22 -32 6 30 -34 15 8 81 0 0 -33 48 7 22 42 26 16 321 -8 -33 36 55 -33 59 21 -32 44 9 -34 53 23 82 0 0 -34 26 15 22 42 22 15 321 -6 -34 15 0 -34 37 32 -33 21 59 -35 31 49 83 0 0 -35 4 32 22 42 18 14 320 -5 -34 53 15 -35 15 53 -34 0 0 -36 10 25 84 0 0 -35 42 59 22 42 14 13 319 -4 -35 31 38 -35 54 22 -34 38 10 -36 49 8 85 0 0 -36 21 32 22 42 11 12 319 -3 -36 10 8 -36 32 58 -35 16 27 -37 27 59 86 0 0 -37 0 11 22 42 8 11 318 -2 -36 48 44 -37 11 40 -35 54 50 -38 6 54 87 0 0 -37 38 54 22 42 6 10 318 -1 -37 27 25 -37 50 25 -36 33 18 -38 45 53 88 0 0 -38 17 39 22 42 3 9 317 0 -38 6 7 -38 29 13 -37 11 48 -39 24 54 Uncertainty in time = +/- 9 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1873-00493-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 42 03.9276 DE: +28 14 28.502 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .024 ) * V mag [mag]: 9.2 * B mag [mag]: 9.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (867) Kovacia approx. diameter [km]: 25 approx. diameter ["]: .019 distance from Earth [AU]: 1.78900 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1172 number of rejected observations: 22 time covered by the observations: 1917 Feb 26 - 2012 Jan 03 1 sigma uncertainty ellipse (major, minor, PA): 0.062, 0.036, 84° remarks: * orbital elements for (867) Kovacia : Mean anomaly = 330.80615989 deg Arg. of pericenter = 69.82289634 deg Long. of node = 46.87741523 deg Inclination = 5.97867050 deg Eccentricity = 0.13049378 Semimajor axis = 3.06841575 AU Perihelion dist = 2.66800659 AU Mag: H = 11.36, G = 0.15 Epoch of elements : MJD 56258.95200000 TDT (2012 Nov 27.952) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 27 867 Kovacia 22h 50.2m UT 9.2 5 42 3.928 28 14 28.50TYC 1873-00493-1 9.6 15.3 25 2.5 1.789 -2.023 5.73 35.7159 28.239 -165.57 -21.33 22.8367 -0.13546 -0.62348 -5.43276 1.16634 -0.00200 -0.00053 2000 329.16461520121119.00000 69.822896 46.877415 5.9786700.13049378 3.0684158 2.668006611.3 5.00.15 RATE 1.8337190 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.066 0.043 85 3.38 0.046 0 0-4 2 056247.0020121127_0493-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 03:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org