IOTA/IOTA-ES occultation update for (355) Gabriella / UCAC2 42017975 event on 2009 Nov 05, 01:48 UT Visible from Summary ------- On 2009 Nov 05 UT, the 23 km diameter asteroid (355) Gabriella will occult a 12.0 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.8 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: 20 * date and approx. time of event: 2009 Nov 05, 01:40 - 2009 Nov 05, 02:00 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 4.0 * Moon: 93 % sunlit, 4° distance * Sun: 147° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 3.43 * 1 sigma uncertainty interval [seconds]: +/- 14.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .093 +/- .075) * 1 sigma uncertainty ellipse (major, minor, PA): ( .093", .075", 89° ) * approx speed of asteroid's shadow [km/s]: 5.6991 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 42017975 by 355 Gabriella on 2009 Nov 5 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 83 0 0 55 10 11 1 40 53 29 280 -1 55 25 20 54 55 11 57 13 3 53 15 29 82 0 0 55 52 13 1 41 7 30 279 -1 56 7 27 55 37 7 57 55 57 53 56 49 81 0 0 56 33 53 1 41 20 31 277 -2 56 49 13 56 18 41 58 38 27 54 37 49 80 0 0 57 15 9 1 41 34 31 276 -3 57 30 35 56 59 52 59 20 31 55 18 27 79 0 0 57 56 0 1 41 47 32 275 -4 58 11 31 57 40 38 60 2 8 55 58 42 78 0 0 58 36 23 1 42 1 32 274 -4 58 51 59 58 20 56 60 43 14 56 38 31 77 0 0 59 16 17 1 42 15 33 273 -5 59 31 57 59 0 45 61 23 48 57 17 54 76 0 0 59 55 39 1 42 28 33 271 -6 60 11 24 59 40 4 62 3 47 57 56 47 75 0 0 60 34 29 1 42 42 34 270 -7 60 50 17 60 18 50 62 43 11 58 35 11 74 0 0 61 12 44 1 42 55 34 269 -7 61 28 36 60 57 2 63 21 56 59 13 3 73 0 0 61 50 24 1 43 9 35 268 -8 62 6 18 61 34 38 64 0 2 59 50 22 72 0 0 62 27 26 1 43 22 35 266 -8 62 43 23 62 11 38 64 37 27 60 27 6 71 0 0 63 3 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.. -129 0 0 54 36 8 2 0 23 5 44 -10 54 51 28 54 20 56 56 40 32 .. .. .. -130 0 0 53 51 29 2 0 25 4 43 -9 54 6 43 53 36 23 55 55 1 .. .. .. -131 0 0 53 6 30 2 0 27 3 42 -8 53 21 38 52 51 30 55 9 7 .. .. .. -132 0 0 52 21 13 2 0 28 2 41 -8 52 36 15 52 6 20 54 22 53 .. .. .. -133 0 0 51 35 41 2 0 29 1 41 -7 51 50 35 51 20 53 53 36 22 .. .. .. -134 0 0 50 49 55 2 0 29 0 40 -6 51 4 42 .. .. .. 52 49 37 .. .. .. Uncertainty in time = +/- 17 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 42017975 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 52 40.7684 DE: +29 09 13.966 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .087, .073 ) * V mag [mag]: 12.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (355) Gabriella approx. diameter [km]: 23 approx. diameter ["]: .022 distance from Earth [AU]: 1.41800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 834 number of rejected observations: 79 time covered by the observations: 1911 Aug 28 - 2007 Aug 08 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.015, 83° remarks: * orbital elements for (355) Gabriella : Mean anomaly = 330.65191336 deg Arg. of pericenter = 106.04697395 deg Long. of node = 351.89039747 deg Inclination = 4.28253101 deg Eccentricity = 0.10555714 Semimajor axis = 2.53739849 AU Perihelion dist = 2.26955797 AU Mag: H = 10.16, G = 0.15 Epoch of elements : MJD 55140.07500000 TDT (2009 Nov 05.075) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 5 355 Gabriella 1h 48.5m UT 12.0 4 52 40.768 29 9 13.97UCAC2 42017975 0.0 13.8 23 4.0 1.418 -1.491 4.20 1.6021 29.154 148.77 -15.68 1.8089 0.16197 0.74822 -3.14446 0.67805 -0.00296 -0.00089 2000 328.19513420091026.00000106.046974351.890397 4.2825310.10555714 2.5373985 2.269558010.4 5.00.15 RATE 2.4384900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.093 0.075 89 4.43 0.077 0 54545.5020091105_017975 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 16:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org