IOTA/IOTA-ES occultation update for (1988) Delores / TYC 4677-00037-1 event on 2012 Oct 28, 15:34 UT Visible from Japan, China, India, Arabia Summary ------- On 2012 Oct 28 UT, the 23 km diameter asteroid (1988) Delores will occult a 10.7 mag star in the constellation Cetus for observers along a path across Japan, China, India, Arabia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 15.9 mag (the magnitude of the asteroid) for at most 4.1 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: 40 * date and approx. time of event: 2012 Oct 28, 15:18 - 2012 Oct 28, 15:50 UT * geocentric midpoint of event [JD]: 2456229.14890417 * magnitude of target star: 10.7 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 4.1 * Moon: 99 % sunlit, 14° distance * Sun: 155° distance * rough path description: Japan, China, India, Arabia The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 1.64 * 1 sigma uncertainty interval [seconds]: +/- 10.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .075 +/- .053) * 1 sigma uncertainty ellipse (major, minor, PA): ( .077", .050", 74° ) * approx speed of asteroid's shadow [km/s]: 5.6659 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4677-00037-1 by 1988 Delores on 2012 Oct 28 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 24 0 0 20 24 37 15 50 16 13 98 -1 20 31 46 20 17 28 20 55 17 19 54 6 25 0 0 20 24 12 15 50 11 14 98 -2 20 31 21 20 17 4 20 54 52 19 53 41 26 0 0 20 23 58 15 50 6 15 99 -2 20 31 6 20 16 49 20 54 37 19 53 27 27 0 0 20 23 53 15 50 1 16 99 -3 20 31 2 20 16 45 20 54 32 19 53 23 28 0 0 20 23 58 15 49 55 16 99 -4 20 31 7 20 16 50 20 54 38 19 53 28 29 0 0 20 24 14 15 49 49 17 100 -5 20 31 23 20 17 5 20 54 53 19 53 44 30 0 0 20 24 39 15 49 43 18 100 -6 20 31 48 20 17 31 20 55 18 19 54 9 31 0 0 20 25 14 15 49 36 19 100 -7 20 32 23 20 18 6 20 55 53 19 54 45 32 0 0 20 25 59 15 49 30 20 101 -8 20 33 8 20 18 51 20 56 38 19 55 30 33 0 0 20 26 54 15 49 22 21 101 -9 20 34 3 20 19 46 20 57 33 19 56 25 34 0 0 20 27 59 15 49 15 22 102 -10 20 35 7 20 20 50 20 58 37 19 57 29 35 0 0 20 29 13 15 49 7 23 102 -10 20 36 22 20 22 5 20 59 51 19 58 44 36 0 0 20 30 37 15 48 59 24 103 -11 20 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Uncertainty in time = +/- 10 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 4677-00037-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 56 04.0352 DE: -02 47 04.040 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .040, .026 ) * V mag [mag]: 10.7 * B mag [mag]: 11.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1988) Delores approx. diameter [km]: 23 approx. diameter ["]: .031 distance from Earth [AU]: 1.03500 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1099 number of rejected observations: 32 time covered by the observations: 1952 Sep 28 - 2012 Oct 25 1 sigma uncertainty ellipse (major, minor, PA): 0.067, 0.043, 68° remarks: * orbital elements for (1988) Delores : Mean anomaly = 34.46977179 deg Arg. of pericenter = 235.17242744 deg Long. of node = 106.40860558 deg Inclination = 4.25153335 deg Eccentricity = 0.10206864 Semimajor axis = 2.15379022 AU Perihelion dist = 1.93395578 AU Mag: H = 13.47, G = 0.15 Epoch of elements : MJD 56228.64900000 TDT (2012 Oct 28.649) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 28 1988 Delores 15h 34.4m UT 10.7 0 56 4.035- 2 47 4.04TYC 4677-00037-1 11.8 15.9 23 4.1 1.035 -1.792 -3.99 103.0278 -2.782 -57.66 -13.40 15.5737 -0.07119 0.48170 -3.16316 -0.47069 0.00170 0.00146 2000 31.77287220121020.00000235.172427106.408606 4.2515330.10206864 2.1537902 1.933955813.6 5.00.15 RATE 3.1181640 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.077 0.050 74 2.64 0.050 0 0 2 0 056226.0020121028_0037-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org