IOTA/IOTA-ES occultation update for (146) Lucina / TYC 1882-00850-1 event on 2007 Dec 17, 01:04 UT Visible from Russia, Scandanavia, Greenland, N Canada Summary ------- On 2007 Dec 17 UT, the 132 km diameter asteroid (146) Lucina will occult a 10.2 mag star in the constellation Gemini for observers along a path across Russia, Scandanavia, Greenland, N Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 12.2 mag (the magnitude of the asteroid) for at most 9.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2007 Dec 17, 00:59 - 2007 Dec 17, 01:10 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 9.7 * Moon: 46 % sunlit, 106° distance * Sun: 169° distance * rough path description: Russia, Scandanavia, Greenland, N Canada The occultation path -------------------- * approximate projected width [km]: 187 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .020", 85° ) * approx speed of asteroid's shadow [km/s]: 13.5740 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1882-00850-1 by 146 Lucina on 2007 Dec 17 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 -141 0 0 .. .. .. .. .. .. .. .. .. 55 23 35 .. .. .. 55 56 59 .. .. .. -140 0 0 54 46 15 1 10 10 0 41 -3 56 3 53 .. .. .. 56 37 21 .. .. .. -139 0 0 55 25 52 1 10 10 1 42 -3 56 43 35 54 10 46 57 17 5 .. .. .. -138 0 0 56 4 53 1 10 9 2 43 -4 57 22 39 54 49 44 57 56 10 .. .. .. -137 0 0 56 43 16 1 10 9 3 44 -5 58 1 3 55 28 6 58 34 35 .. .. .. -136 0 0 57 21 0 1 10 9 3 45 -6 58 38 47 56 5 51 59 12 18 .. .. .. -135 0 0 57 58 4 1 10 8 4 45 -7 59 15 48 56 42 58 59 49 18 .. .. .. -134 0 0 58 34 27 1 10 7 5 46 -8 59 52 7 57 19 25 60 25 35 .. .. .. -133 0 0 59 10 8 1 10 6 6 47 -8 60 27 42 57 55 12 61 1 7 57 24 25 -132 0 0 59 45 7 1 10 5 7 48 -9 61 2 32 58 30 17 61 35 54 57 59 34 -131 0 0 60 19 22 1 10 4 7 49 -10 61 36 38 59 4 42 62 9 56 58 34 2 -130 0 0 60 52 54 1 10 3 8 50 -10 62 9 58 59 38 24 62 43 11 59 7 48 -129 0 0 61 25 41 1 10 2 9 51 -11 62 42 33 60 11 23 63 15 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29 26 34 25 89 0 0 27 23 25 0 59 16 9 295 2 28 24 12 26 23 52 28 50 8 25 59 13 90 0 0 26 48 15 0 59 14 8 295 3 27 48 38 25 49 6 28 14 23 25 24 36 91 0 0 26 13 42 0 59 12 7 296 4 27 13 41 25 14 56 27 39 15 24 50 35 92 0 0 25 39 47 0 59 11 6 296 5 26 39 22 24 41 23 27 4 46 .. .. .. 93 0 0 25 6 30 0 59 10 5 296 6 26 5 42 24 8 28 26 30 55 .. .. .. 94 0 0 24 33 52 0 59 9 4 297 7 25 32 41 23 36 11 25 57 45 .. .. .. 95 0 0 24 1 54 0 59 8 3 297 8 25 0 21 .. .. .. 25 25 14 .. .. .. 96 0 0 23 30 37 0 59 8 1 298 9 24 28 41 .. .. .. 24 53 26 .. .. .. 97 0 0 23 0 0 0 59 8 0 298 10 23 57 44 .. .. .. 24 22 19 .. .. .. 98 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 23 51 54 .. .. .. Data for the target star ------------------------ * name: TYC 1882-00850-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 22 35.6756 DE: +25 54 23.643 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .015, .016 ) * V mag [mag]: 10.2 * B mag [mag]: 10.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (146) Lucina approx. diameter [km]: 132 approx. diameter ["]: .097 distance from Earth [AU]: 1.86800 * orbital information: orbit source: Preston date of fit: 2007 Dec 05 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 745 number of rejected observations: 82 time covered by the observations: 1906 Apr 28 - 2007 Dec 05 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.011, 80° remarks: * orbital elements for (146) Lucina : Mean anomaly = 229.17962791 deg Arg. of pericenter = 143.62281505 deg Long. of node = 84.17538016 deg Inclination = 13.07456903 deg Eccentricity = 0.06467678 Semimajor axis = 2.71952516 AU Perihelion dist = 2.54363503 AU Mag: H = 8.19, G = 0.11 Epoch of elements : MJD 54451.04500000 TDT (2007 Dec 17.045) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Dec 17 146 Lucina 1h 4.7m UT 10.2 6 22 35.676 25 54 23.64TYC 1882-00850-1 10.6 12.2 132 9.7 1.868 -2.517 12.17 -5.804 25.904 162.77 -23.33 1.0776 .23889 .66621 -7.21200 2.58572 -0.00106 -0.00022 2000 228.94997020071216.00000143.622815 84.175380 13.0745690.064676782.719525162.543635038.205 0.11 RATE 2.1976800 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.023 0.020 84.5 1.210 0.020 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 06, 02:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org