IOTA/IOTA-ES occultation update for (5190) 1990 UR2 / HIP 2360 event on 2012 Oct 15, 21:29 UT Visible from China, SW Asia, Africa Summary ------- On 2012 Oct 15 UT, the 15 km diameter asteroid (5190) 1990 UR2 will occult a 9.0 mag star in the constellation Andromeda for observers along a path across China, SW Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.0 mag to 16.0 mag (the magnitude of the asteroid) for at most 1.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 10 * date and approx. time of event: 2012 Oct 15, 21:20 - 2012 Oct 15, 21:37 UT * geocentric midpoint of event [JD]: 2456216.39539583 * magnitude of target star: 9.0 * magnitude drop [mag]: 7.0 * estimated maximum duration [s]: 1.2 * Moon: 0 % sunlit, 160° distance * Sun: 160° distance * rough path description: China, SW Asia, Africa The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 6.52 * 1 sigma uncertainty interval [seconds]: +/- 10.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .095 +/- .079) * 1 sigma uncertainty ellipse (major, minor, PA): ( .102", .070", 60° ) * approx speed of asteroid's shadow [km/s]: 12.2432 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 2360 by 5190 1990 UR2 on 2012 Oct 15 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 - 57 0 0 - 4 28 41 21 37 47 11 64 0 - 4 24 2 - 4 33 20 - 3 23 19 - 5 33 51 - 56 0 0 - 3 56 40 21 37 45 12 64 -1 - 3 52 1 - 4 1 20 - 2 51 10 - 5 1 59 - 55 0 0 - 3 24 20 21 37 42 13 64 -2 - 3 19 40 - 3 29 0 - 2 18 42 - 4 29 47 - 54 0 0 - 2 51 42 21 37 40 15 64 -4 - 2 47 1 - 2 56 22 - 1 45 55 - 3 57 16 - 53 0 0 - 2 18 45 21 37 37 16 64 -5 - 2 14 4 - 2 23 26 - 1 12 51 - 3 24 27 - 52 0 0 - 1 45 32 21 37 34 17 64 -6 - 1 40 50 - 1 50 14 - 0 39 30 - 2 51 21 - 51 0 0 - 1 12 3 21 37 31 18 64 -7 - 1 7 20 - 1 16 45 - 0 5 54 - 2 17 59 - 50 0 0 - 0 38 18 21 37 28 19 64 -8 - 0 33 35 - 0 43 1 0 27 58 - 1 44 21 - 49 0 0 - 0 4 19 21 37 24 20 64 -9 0 0 24 - 0 9 2 1 2 3 - 1 10 29 - 48 0 0 0 29 53 21 37 20 21 64 -10 0 34 37 0 25 10 1 36 21 - 0 36 23 - 47 0 0 1 4 18 21 37 17 23 64 -11 1 9 2 0 59 34 2 10 52 - 0 2 4 - 46 0 0 1 38 54 21 37 12 24 64 -12 1 43 38 1 34 9 2 45 33 0 32 27 - 45 0 0 2 13 40 21 37 8 25 64 -13 2 18 25 2 8 55 3 20 24 1 7 8 - 44 0 0 2 48 35 21 37 4 26 64 -14 2 53 21 2 43 50 3 55 25 1 41 59 - 43 0 0 3 23 40 21 36 59 27 64 -15 3 28 25 3 18 54 4 30 33 2 16 58 - 42 0 0 3 58 51 21 36 54 28 64 -16 4 3 37 3 54 5 5 5 49 2 52 6 - 41 0 0 4 34 9 21 36 49 29 64 -17 4 38 55 4 29 23 5 41 10 3 27 20 - 40 0 0 5 9 32 21 36 44 30 64 -18 5 14 18 5 4 45 6 16 37 4 2 40 - 39 0 0 5 44 59 21 36 38 32 64 -19 5 49 45 5 40 12 6 52 7 4 38 4 - 38 0 0 6 20 29 21 36 33 33 65 -20 6 25 16 6 15 43 7 27 40 5 13 32 - 37 0 0 6 56 2 21 36 27 34 65 -21 7 0 48 6 51 15 8 3 14 5 49 2 - 36 0 0 7 31 35 21 36 21 35 65 -22 7 36 22 7 26 48 8 38 49 6 24 34 - 35 0 0 8 7 9 21 36 15 36 65 -23 8 11 56 8 2 22 9 14 24 7 0 6 - 34 0 0 8 42 41 21 36 9 37 65 -25 8 47 28 8 37 54 9 49 58 7 35 38 - 33 0 0 9 18 12 21 36 3 38 66 -26 9 22 59 9 13 25 10 25 29 8 11 8 - 32 0 0 9 53 39 21 35 56 39 66 -27 9 58 26 9 48 52 11 0 56 8 46 35 - 31 0 0 10 29 2 21 35 49 41 66 -28 10 33 49 10 24 15 11 36 19 9 21 59 - 30 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14 32 30 25 30 25 9 113 0 0 31 5 31 21 21 0 12 292 -16 31 9 59 31 1 3 32 8 25 30 2 48 114 0 0 30 42 51 21 20 58 11 292 -15 30 47 20 30 38 22 31 45 56 29 39 57 115 0 0 30 19 42 21 20 57 10 293 -14 30 24 12 30 15 12 31 22 58 29 16 37 116 0 0 29 56 4 21 20 55 9 293 -13 30 0 34 29 51 33 30 59 30 28 52 48 117 0 0 29 31 56 21 20 54 8 294 -12 29 36 28 29 27 25 30 35 33 28 28 30 118 0 0 29 7 20 21 20 53 7 294 -11 29 11 52 29 2 47 30 11 8 28 3 43 119 0 0 28 42 14 21 20 52 6 295 -11 28 46 47 28 37 41 29 46 13 27 38 26 120 0 0 28 16 39 21 20 51 5 295 -10 28 21 13 28 12 6 29 20 49 27 12 41 121 0 0 27 50 36 21 20 50 4 296 -9 27 55 10 27 46 1 28 54 56 26 46 27 122 0 0 27 24 3 21 20 49 3 296 -8 27 28 39 27 19 28 28 28 35 26 19 44 123 0 0 26 57 3 21 20 49 2 296 -7 27 1 39 26 52 27 28 1 45 25 52 32 124 0 0 26 29 34 21 20 48 1 297 -6 26 34 10 26 24 57 27 34 26 .. .. .. 125 0 0 26 1 36 21 20 48 0 297 -5 26 6 14 25 56 59 27 6 39 .. .. .. Uncertainty in time = +/- 12 secs Prediction of 2012 Jul 10.0 Data for the target star ------------------------ * name: HIP 2360 * constellation : Andromeda * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 30 09.2948 DE: +24 36 25.640 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .030, .025 ) * V mag [mag]: 9.0 * B mag [mag]: 9.7 * Apparent position with proper motion RA(deg): 7.7165622309 DE(deg): 24.6815724283 * Equation of equinoxes (radians) : 0.000059511085428 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5190) 1990 UR2 approx. diameter [km]: 15 approx. diameter ["]: .011 distance from Earth [AU]: 1.95800 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 550 number of rejected observations: 13 time covered by the observations: 1969 Jan 15 - 2011 Nov 17 1 sigma uncertainty ellipse (major, minor, PA): 0.098, 0.066, 57° remarks: * orbital elements for (5190) 1990 UR2 : Mean anomaly = 301.68387743 deg Arg. of pericenter = 148.82705991 deg Long. of node = 312.11552491 deg Inclination = 14.08687081 deg Eccentricity = 0.20936313 Semimajor axis = 3.14361185 AU Perihelion dist = 2.48545544 AU Mag: H = 11.82, G = 0.15 Epoch of elements : MJD 56215.89500000 TDT (2012 Oct 15.895) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 15 5190 1990 UR2 21h 29.4m UT 9.0 0 30 9.295 24 36 25.64HIP 2360 9.7 16.0 15 1.2 1.958 -2.145 -10.34 20.3833 24.610 -145.94 -8.92 21.4895 -0.05181 0.14760 -6.51580 -2.30177 0.00135 -0.00152 2000 300.64145320121010.00000148.827060312.115525 14.0868710.20936313 3.1436119 2.485455411.7 5.00.15 RATE 1.7683190 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.102 0.070 60 7.52 0.069 0 0-2 0 056118.0020121015___2360 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 26, 04:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org