IOTA/IOTA-ES occultation update for (2527) Gregory / TYC 0001-01167-1 event on 2012 Oct 02, 12:14 UT Visible from New Zealand Summary ------- On 2012 Oct 02 UT, the 15 km diameter asteroid (2527) Gregory will occult a 9.3 mag star in the constellation Pisces for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 15.0 mag (the magnitude of the asteroid) for at most 2.2 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: 24 * date and approx. time of event: 2012 Oct 02, 12:01 - 2012 Oct 02, 12:28 UT * geocentric midpoint of event [JD]: 2456203.01053333 * magnitude of target star: 9.3 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 2.2 * Moon: 95 % sunlit, 35° distance * Sun: 171° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 2.80 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .077 +/- .058) * 1 sigma uncertainty ellipse (major, minor, PA): ( .079", .055", 70° ) * approx speed of asteroid's shadow [km/s]: 6.5791 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0001-01167-1 by 2527 Gregory on 2012 Oct 2 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 90 0 0 -67 5 36 12 28 13 7 73 0 -67 0 32 -67 10 41 -66 32 15 -67 39 12 91 0 0 -67 0 23 12 28 12 7 72 -1 -66 55 18 -67 5 28 -66 26 56 -67 34 4 92 0 0 -66 54 52 12 28 11 8 71 -1 -66 49 46 -66 59 58 -66 21 20 -67 28 39 93 0 0 -66 49 4 12 28 9 8 70 -1 -66 43 57 -66 54 11 -66 15 25 -67 22 56 94 0 0 -66 42 57 12 28 8 8 69 -2 -66 37 50 -66 48 5 -66 9 13 -67 16 56 95 0 0 -66 36 33 12 28 7 9 68 -2 -66 31 24 -66 41 42 -66 2 42 -67 10 38 96 0 0 -66 29 50 12 28 6 9 67 -3 -66 24 40 -66 35 0 -65 55 53 -67 4 2 97 0 0 -66 22 49 12 28 4 10 67 -3 -66 17 38 -66 28 0 -65 48 45 -66 57 7 98 0 0 -66 15 29 12 28 3 10 66 -4 -66 10 17 -66 20 41 -65 41 18 -66 49 54 99 0 0 -66 7 50 12 28 1 10 65 -4 -66 2 37 -66 13 3 -65 33 32 -66 42 22 100 0 0 -65 59 51 12 28 0 11 64 -4 -65 54 37 -66 5 5 -65 25 26 -66 34 32 101 0 0 -65 51 33 12 27 58 11 63 -5 -65 46 18 -65 56 49 -65 17 0 -66 26 21 102 0 0 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35 46 -10 45 51 -139 0 0 - 9 46 49 12 5 51 36 277 -43 - 9 41 31 - 9 52 6 - 9 12 1 -10 21 52 -138 0 0 - 9 23 32 12 5 39 35 277 -42 - 9 18 15 - 9 28 48 - 8 48 52 - 9 58 27 -137 0 0 - 9 0 50 12 5 27 34 276 -41 - 8 55 35 - 9 6 5 - 8 26 17 - 9 35 38 -136 0 0 - 8 38 43 12 5 15 33 276 -41 - 8 33 29 - 8 43 57 - 8 4 17 - 9 13 24 -135 0 0 - 8 17 12 12 5 4 32 276 -40 - 8 11 59 - 8 22 25 - 7 42 52 - 8 51 47 -134 0 0 - 7 56 17 12 4 53 31 275 -39 - 7 51 5 - 8 1 29 - 7 22 4 - 8 30 45 -133 0 0 - 7 35 58 12 4 43 30 275 -38 - 7 30 47 - 7 41 9 - 7 1 51 - 8 10 19 -132 0 0 - 7 16 15 12 4 33 29 274 -37 - 7 11 5 - 7 21 26 - 6 42 14 - 7 50 31 -131 0 0 - 6 57 9 12 4 23 28 274 -36 - 6 52 0 - 7 2 19 - 6 23 14 - 7 31 19 -130 0 0 - 6 38 40 12 4 13 27 274 -35 - 6 33 32 - 6 43 49 - 6 4 51 - 7 12 44 -129 0 0 - 6 20 48 12 4 4 26 273 -34 - 6 15 40 - 6 25 56 - 5 47 4 - 6 54 46 -128 0 0 - 6 3 33 12 3 55 26 273 -34 - 5 58 26 - 6 8 40 - 5 29 54 - 6 37 26 -127 0 0 - 5 46 55 12 3 46 25 273 -33 - 5 41 49 - 5 52 2 - 5 13 22 - 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-113 0 0 - 3 1 9 12 2 18 11 271 -19 - 2 56 10 - 3 6 8 - 2 28 23 - 3 34 8 -112 0 0 - 2 54 12 12 2 14 10 271 -18 - 2 49 13 - 2 59 11 - 2 21 28 - 3 27 9 -111 0 0 - 2 47 55 12 2 11 9 271 -18 - 2 42 56 - 2 52 53 - 2 15 12 - 3 20 51 -110 0 0 - 2 42 18 12 2 8 8 271 -17 - 2 37 19 - 2 47 16 - 2 9 36 - 3 15 12 -109 0 0 - 2 37 21 12 2 5 7 271 -16 - 2 32 23 - 2 42 19 - 2 4 40 - 3 10 14 -108 0 0 - 2 33 4 12 2 3 6 271 -15 - 2 28 6 - 2 38 2 - 2 0 24 - 3 5 57 -107 0 0 - 2 29 28 12 2 1 5 271 -14 - 2 24 30 - 2 34 26 - 1 56 49 - 3 2 21 -106 0 0 - 2 26 33 12 1 59 4 270 -13 - 2 21 35 - 2 31 31 .. .. .. - 2 59 25 -105 0 0 - 2 24 19 12 1 58 3 270 -12 - 2 19 21 - 2 29 17 .. .. .. - 2 57 11 -104 0 0 - 2 22 45 12 1 57 2 270 -11 - 2 17 47 - 2 27 43 .. .. .. - 2 55 38 -103 0 0 - 2 21 53 12 1 56 1 270 -10 - 2 16 55 - 2 26 51 .. .. .. - 2 54 47 -102 0 0 - 2 21 43 12 1 56 0 270 -9 - 2 16 45 - 2 26 41 .. .. .. - 2 54 37 Uncertainty in time = +/- 9 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 0001-01167-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 00 27.7552 DE: +00 12 18.738 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .025 ) * V mag [mag]: 9.3 * B mag [mag]: 9.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2527) Gregory approx. diameter [km]: 15 approx. diameter ["]: .020 distance from Earth [AU]: 1.01500 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1125 number of rejected observations: 18 time covered by the observations: 1950 Sep 14 - 2012 Sep 19 1 sigma uncertainty ellipse (major, minor, PA): 0.077, 0.049, 69° remarks: * orbital elements for (2527) Gregory : Mean anomaly = 0.34118619 deg Arg. of pericenter = 177.94083871 deg Long. of node = 186.37956111 deg Inclination = 2.61479742 deg Eccentricity = 0.18513428 Semimajor axis = 2.46549828 AU Perihelion dist = 2.00905002 AU Mag: H = 13.12, G = 0.15 Epoch of elements : MJD 56202.51000000 TDT (2012 Oct 02.510) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 2 2527 Gregory 12h 15.2m UT 9.3 0 0 27.755 0 12 18.74TYC 0001-01167-1 9.7 15.0 15 2.2 1.015 -1.805 -17.35 164.7032 0.209 -6.49 -3.85 12.2528 0.30931 -0.48280 -3.12698 -2.00290 0.00077 0.00032 2000 359.7021572012 930.00000177.940839186.379561 2.6147970.18513428 2.4654983 2.009050013.1 5.00.15 RATE 2.5459330 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.079 0.055 70 3.80 0.057 0 0 2-2 056197.0020121002_1167-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 21:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org