IOTA/IOTA-ES occultation update for (285) Regina / UCAC2 44775168 event on 2009 Nov 03, 22:10 UT Visible from Summary ------- On 2009 Nov 03 UT, the 45 km diameter asteroid (285) Regina will occult a 11.2 mag star in the constellation Andromeda for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 14.7 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: 63 * date and approx. time of event: 2009 Nov 03, 22:01 - 2009 Nov 03, 22:19 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 4.1 * Moon: 98 % sunlit, 32° distance * Sun: 152° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 48 * 1 sigma uncertainty interval [path widths]: +/- 0.96 * 1 sigma uncertainty interval [seconds]: +/- 6.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .033", 66° ) * approx speed of asteroid's shadow [km/s]: 11.0569 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 44775168 by 285 Regina on 2009 Nov 3 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 - 68 4 8 1 0 0 22 19 3 17 51 -1 - 68 22 19 - 67 45 59 - 68 57 22 - 67 11 17 Latitude Latitude Latitude Latitude - 68 0 0 1 4 11 22 19 3 17 51 -1 1 22 37 0 45 48 1 58 10 0 10 38 - 67 0 0 2 5 32 22 18 58 18 51 -2 2 24 7 1 46 59 2 59 58 1 11 31 - 66 0 0 3 7 50 22 18 53 20 51 -4 3 26 35 2 49 9 4 2 45 2 13 23 - 65 0 0 4 11 6 22 18 48 21 51 -5 4 30 0 3 52 14 5 6 27 3 16 12 - 64 0 0 5 15 15 22 18 42 22 51 -6 5 34 18 4 56 14 6 11 4 4 19 54 - 63 0 0 6 20 15 22 18 36 24 52 -7 6 39 28 6 1 5 7 16 31 5 24 28 - 62 0 0 7 26 3 22 18 29 25 52 -8 7 45 25 7 6 45 8 22 46 6 29 50 - 61 0 0 8 32 37 22 18 23 27 52 -10 8 52 8 8 13 10 9 29 47 7 35 58 - 60 0 0 9 39 53 22 18 15 28 52 -11 9 59 33 9 20 17 10 37 29 8 42 49 - 59 0 0 10 47 48 22 18 8 30 53 -12 11 7 36 10 28 3 11 45 49 9 50 19 - 58 0 0 11 56 18 22 17 59 31 53 -13 12 16 15 11 36 25 12 54 44 10 58 25 - 57 0 0 13 5 19 22 17 51 32 54 -14 13 25 25 12 45 18 14 4 10 12 7 3 - 56 0 0 14 14 48 22 17 42 34 54 -16 14 35 1 13 54 39 15 14 3 13 16 9 - 55 0 0 15 24 40 22 17 33 35 55 -17 15 45 1 15 4 24 16 24 18 14 25 39 - 54 0 0 16 34 52 22 17 24 37 55 -18 16 55 20 16 14 28 17 34 51 15 35 29 - 53 0 0 17 45 18 22 17 14 38 56 -19 18 5 53 17 24 47 18 45 38 16 45 35 - 52 0 0 18 55 54 22 17 4 40 56 -20 19 16 36 18 35 17 19 56 34 17 55 52 - 51 0 0 20 6 36 22 16 54 41 57 -21 20 27 25 19 45 52 21 7 35 19 6 16 - 50 0 0 21 17 19 22 16 43 42 58 -22 21 38 14 20 56 30 22 18 36 20 16 42 - 49 0 0 22 27 59 22 16 32 44 59 -23 22 48 59 22 7 4 23 29 32 21 27 6 - 48 0 0 23 38 30 22 16 21 45 60 -24 23 59 36 23 17 30 24 40 19 22 37 23 - 47 0 0 24 48 49 22 16 10 46 61 -25 25 9 59 24 27 44 25 50 51 23 47 28 - 46 0 0 25 58 50 22 15 58 48 62 -26 26 20 4 25 37 40 27 1 4 24 57 17 - 45 0 0 27 8 28 22 15 47 49 63 -27 27 29 46 26 47 15 28 10 54 26 6 45 - 44 0 0 28 17 40 22 15 35 50 64 -28 28 39 1 27 56 24 29 20 15 27 15 48 - 43 0 0 29 26 20 22 15 23 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115 0 0 58 3 20 22 2 21 22 306 -13 58 21 37 57 45 7 58 56 53 57 10 16 116 0 0 57 31 13 22 2 18 21 307 -12 57 49 40 57 12 49 58 25 16 56 37 39 117 0 0 56 58 0 22 2 15 21 308 -12 57 16 37 56 39 25 57 52 33 56 3 55 118 0 0 56 23 38 22 2 12 20 309 -11 56 42 26 56 4 53 57 18 43 55 29 3 119 0 0 55 48 7 22 2 9 19 309 -11 56 7 6 55 29 11 56 43 43 54 53 1 120 0 0 55 11 23 22 2 6 18 310 -10 55 30 33 54 52 18 56 7 31 54 15 48 121 0 0 54 33 27 22 2 3 17 311 -9 54 52 47 54 14 10 55 30 5 53 37 21 122 0 0 53 54 15 22 2 0 16 312 -8 54 13 46 53 34 48 54 51 25 52 57 38 123 0 0 53 13 46 22 1 58 16 313 -8 53 33 28 52 54 9 54 11 27 52 16 39 124 0 0 52 31 59 22 1 55 15 314 -7 52 51 51 52 12 11 53 30 11 51 34 22 125 0 0 51 48 52 22 1 53 14 314 -6 52 8 54 51 28 54 52 47 33 50 50 45 126 0 0 51 4 22 22 1 50 13 315 -5 51 24 35 50 44 14 52 3 34 50 5 47 127 0 0 50 18 30 22 1 48 12 316 -5 50 38 53 49 58 13 51 18 12 49 19 26 128 0 0 49 31 14 22 1 46 11 317 -4 49 51 46 49 10 47 50 31 25 48 31 42 129 0 0 48 42 33 22 1 44 10 317 -3 49 3 15 48 21 56 49 43 12 47 42 33 130 0 0 47 52 26 22 1 42 9 318 -2 48 13 17 47 31 39 48 53 32 46 51 59 131 0 0 47 0 51 22 1 40 8 319 -1 47 21 51 46 39 56 48 2 24 45 59 59 Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 44775168 * constellation : Andromeda * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 18 06.2635 DE: +37 24 48.454 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .017 ) * V mag [mag]: 11.2 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (285) Regina approx. diameter [km]: 45 approx. diameter ["]: .034 distance from Earth [AU]: 1.83900 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 648 number of rejected observations: 20 time covered by the observations: 1938 Jul 27 - 2007 Jul 22 1 sigma uncertainty ellipse (major, minor, PA): 0.057, 0.028, 64° remarks: * orbital elements for (285) Regina : Mean anomaly = 49.12471337 deg Arg. of pericenter = 14.60880791 deg Long. of node = 311.41397855 deg Inclination = 17.63052115 deg Eccentricity = 0.20875731 Semimajor axis = 3.08108165 AU Perihelion dist = 2.43788333 AU Mag: H = 10.70, G = 0.15 Epoch of elements : MJD 55138.92400000 TDT (2009 Nov 03.924) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 3 285 Regina 22h 10.5m UT 11.2 1 18 6.263 37 24 48.45UCAC2 44775168 0.0 14.7 45 4.1 1.839 -2.073 -16.74 3.5966 37.419 -156.73 -15.32 22.1754 -0.20330 0.29989 -5.16731 -3.49958 0.00187 -0.00200 2000 47.49838220091026.00000 14.608808311.413979 17.6305210.20875731 3.0810817 2.437883310.5 5.00.15 RATE 1.8224240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.033 66 1.96 0.033 0 54545.5020091103_775168 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 16:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org