IOTA/IOTA-ES occultation update for (1263) Varsavia / 2UCAC 37387291 event on 2008 May 13, 03:00 UT Visible from Africa, E USA Summary ------- On 2008 May 13 UT, the 49 km diameter asteroid (1263) Varsavia will occult a 12.9 mag star in the constellation Hercules for observers along a path across Africa, E USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 15.7 mag (the magnitude of the asteroid) for at most 4.0 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: 39 * date and approx. time of event: 2008 May 13, 02:50 - 2008 May 13, 03:08 UT * magnitude of target star: 12.9 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 4.0 * Moon: 61 % sunlit, 108° distance * Sun: 129° distance * rough path description: Africa, E USA The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 1.68 * 1 sigma uncertainty interval [seconds]: +/- 6.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .045", 92° ) * approx speed of asteroid's shadow [km/s]: 12.2755 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 37387291 by 1263 Varsavia on 2008 May 13 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 Latitude Latitude Latitude Latitude 62 0 0 -39 55 18 2 50 53 6 296 0 -39 40 32 -40 10 4 -38 50 55 -40 59 45 61 0 0 -39 32 21 2 50 54 7 297 -1 -39 17 31 -39 47 12 -38 27 39 -40 37 8 60 0 0 -39 8 42 2 50 55 8 298 -1 -38 53 47 -39 23 38 -38 3 40 -40 13 49 59 0 0 -38 44 20 2 50 56 9 298 -2 -38 29 20 -38 59 20 -37 38 58 -39 49 47 58 0 0 -38 19 14 2 50 58 9 299 -3 -38 4 9 -38 34 19 -37 13 31 -39 25 2 57 0 0 -37 53 24 2 50 59 10 300 -3 -37 38 14 -38 8 33 -36 47 20 -38 59 33 56 0 0 -37 26 49 2 51 1 11 300 -4 -37 11 34 -37 42 3 -36 20 24 -38 33 19 55 0 0 -36 59 29 2 51 2 12 301 -4 -36 44 10 -37 14 48 -35 52 43 -38 6 21 54 0 0 -36 31 23 2 51 4 13 301 -5 -36 15 59 -36 46 48 -35 24 15 -37 38 37 53 0 0 -36 2 32 2 51 6 14 302 -6 -35 47 2 -36 18 1 -34 55 2 -37 10 8 52 0 0 -35 32 54 2 51 8 15 303 -6 -35 17 19 -35 48 29 -34 25 2 -36 40 52 51 0 0 -35 2 29 2 51 10 16 303 -7 -34 46 50 -35 18 9 -33 54 15 -36 10 50 50 0 0 -34 31 17 2 51 13 17 304 -7 -34 15 33 -34 47 2 -33 22 41 -35 40 0 49 0 0 -33 59 18 2 51 16 18 304 -8 -33 43 28 -34 15 8 -32 50 19 -35 8 24 48 0 0 -33 26 31 2 51 18 19 305 -9 -33 10 36 -33 42 26 -32 17 9 -34 36 0 47 0 0 -32 52 56 2 51 21 20 305 -9 -32 36 56 -33 8 57 -31 43 11 -34 2 47 46 0 0 -32 18 33 2 51 24 21 306 -10 -32 2 27 -32 34 38 -31 8 25 -33 28 47 45 0 0 -31 43 21 2 51 28 22 306 -11 -31 27 10 -31 59 32 -30 32 51 -32 53 58 44 0 0 -31 7 21 2 51 31 23 307 -11 -30 51 5 -31 23 37 -29 56 28 -32 18 21 43 0 0 -30 30 32 2 51 35 24 307 -12 -30 14 11 -30 46 54 -29 19 17 -31 41 55 42 0 0 -29 52 55 2 51 39 25 308 -13 -29 36 29 -30 9 22 -28 41 18 -31 4 41 41 0 0 -29 14 30 2 51 43 26 308 -13 -28 57 58 -29 31 2 -28 2 30 -30 26 38 40 0 0 -28 35 16 2 51 48 27 309 -14 -28 18 39 -28 51 53 -27 22 54 -29 47 46 39 0 0 -27 55 14 2 51 52 28 309 -15 -27 38 33 -28 11 56 -26 42 30 -29 8 6 38 0 0 -27 14 25 2 51 57 29 310 -15 -26 57 38 -27 31 12 -26 1 19 -28 27 39 37 0 0 -26 32 48 2 52 2 30 310 -16 -26 15 56 -26 49 40 -25 19 21 -27 46 23 36 0 0 -25 50 24 2 52 7 32 311 -17 -25 33 28 -26 7 21 -24 36 37 -27 4 20 35 0 0 -25 7 14 2 52 13 33 311 -17 -24 50 13 -25 24 15 -23 53 6 -26 21 31 34 0 0 -24 23 18 2 52 19 34 312 -18 -24 6 13 -24 40 24 -23 8 50 -25 37 55 33 0 0 -23 38 37 2 52 24 35 312 -19 -23 21 27 -23 55 48 -22 23 50 -24 53 34 32 0 0 -22 53 12 2 52 31 36 312 -19 -22 35 58 -23 10 27 -21 38 6 -24 8 28 31 0 0 -22 7 4 2 52 37 37 313 -20 -21 49 46 -22 24 23 -20 51 39 -23 22 39 30 0 0 -21 20 14 2 52 44 39 313 -21 -21 2 51 -21 37 37 -20 4 31 -22 36 6 29 0 0 -20 32 42 2 52 51 40 314 -22 -20 15 16 -20 50 9 -19 16 43 -21 48 52 28 0 0 -19 44 31 2 52 58 41 314 -22 -19 27 1 -20 2 2 -18 28 15 -21 0 57 27 0 0 -18 55 41 2 53 5 42 314 -23 -18 38 7 -19 13 16 -17 39 10 -20 12 23 26 0 0 -18 6 14 2 53 13 43 315 -24 -17 48 37 -18 23 52 -16 49 28 -19 23 11 25 0 0 -17 16 12 2 53 20 45 315 -24 -16 58 32 -17 33 53 -15 59 12 -18 33 22 24 0 0 -16 25 36 2 53 29 46 315 -25 -16 7 52 -16 43 20 -15 8 23 -17 42 59 23 0 0 -15 34 27 2 53 37 47 316 -26 -15 16 41 -15 52 14 -14 17 2 -16 52 3 22 0 0 -14 42 48 2 53 45 48 316 -27 -14 24 59 -15 0 38 -13 25 12 -16 0 35 21 0 0 -13 50 41 2 53 54 50 317 -27 -13 32 49 -14 8 33 -12 32 54 -15 8 38 20 0 0 -12 58 7 2 54 3 51 317 -28 -12 40 13 -13 16 1 -11 40 10 -14 16 13 19 0 0 -12 5 8 2 54 12 52 317 -29 -11 47 13 -12 23 4 -10 47 4 -13 23 23 18 0 0 -11 11 47 2 54 21 54 317 -29 -10 53 50 -11 29 45 - 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Uncertainty in time = +/- 7 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: 2UCAC 37387291 * constellation : Hercules * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 52 13.1948 DE: +15 55 09.821 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .044, .043 ) * V mag [mag]: 12.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1263) Varsavia approx. diameter [km]: 49 approx. diameter ["]: .028 distance from Earth [AU]: 2.41800 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 689 number of rejected observations: 41 time covered by the observations: 1933 Mar 23 - 2008 Apr 25 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.016, 102° remarks: * orbital elements for (1263) Varsavia : Mean anomaly = 164.22990423 deg Arg. of pericenter = 286.98870239 deg Long. of node = 158.59762576 deg Inclination = 29.22717223 deg Eccentricity = 0.18910406 Semimajor axis = 2.66612912 AU Perihelion dist = 2.16195328 AU Mag: H = 10.25, G = 0.15 Epoch of elements : MJD 54599.12500000 TDT (2008 May 13.125) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 13 1263 Varsavia 2h 59.5m UT 12.9 17 52 13.195 15 55 9.822UCAC 37387291 0.0 15.7 49 4.0 2.418 -1.317 16.57 -8.0605 15.915 134.22 18.46 2.9913 -0.03569 -0.04091 -5.21801 4.55835 -0.00329 -0.00292 2000 162.1639762008 5 4.00000286.988702158.597626 29.2271720.18910406 2.6661291 2.161953310.5 5.00.15 RATE 2.2640310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.045 92 2.68 0.047 0 54594.5020080513_387291 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org