IOTA/IOTA-ES occultation update for (187) Lamberta / TYC 2416-00772-1 event on 2007 Dec 20, 05:10 UT Visible from W Africa, USA Summary ------- On 2007 Dec 20 UT, the 130 km diameter asteroid (187) Lamberta will occult a 9.4 mag star in the constellation Auriga for observers along a path across W Africa, USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.3 mag to 12.6 mag (the magnitude of the asteroid) for at most 8.9 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 20, 05:03 - 2007 Dec 20, 05:17 UT * magnitude of target star: 9.4 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 8.9 * Moon: 79 % sunlit, 51° distance * Sun: 166° distance * rough path description: W Africa, USA The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .021", 86° ) * approx speed of asteroid's shadow [km/s]: 14.6894 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2416-00772-1 by 187 Lamberta on 2007 Dec 20 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 -175 0 0 .. .. .. .. .. .. .. .. .. 2 1 58 .. .. .. 2 24 11 .. .. .. -174 0 0 2 3 43 5 17 28 1 53 3 2 48 6 1 19 19 3 10 18 0 57 6 -173 0 0 2 49 45 5 17 28 2 53 2 3 34 5 2 5 23 3 56 15 1 43 12 -172 0 0 3 35 37 5 17 27 3 53 0 4 19 54 2 51 18 4 42 3 2 29 8 -171 0 0 4 21 17 5 17 27 5 53 -1 5 5 31 3 37 2 5 27 38 3 14 54 -170 0 0 5 6 44 5 17 26 6 53 -2 5 50 54 4 22 33 6 12 58 4 0 27 -169 0 0 5 51 56 5 17 25 7 53 -3 6 36 1 5 7 49 6 58 4 4 45 46 -168 0 0 6 36 51 5 17 23 8 53 -4 7 20 52 5 52 50 7 42 52 5 30 48 -167 0 0 7 21 28 5 17 22 10 53 -6 8 5 24 6 37 32 8 27 21 6 15 33 -166 0 0 8 5 46 5 17 20 11 53 -7 8 49 35 7 21 55 9 11 30 6 59 59 -165 0 0 8 49 42 5 17 18 12 53 -8 9 33 26 8 5 57 9 55 17 7 44 4 -164 0 0 9 33 16 5 17 16 13 54 -9 10 16 53 8 49 37 10 38 42 8 27 47 -163 0 0 10 16 26 5 17 14 14 54 -10 10 59 56 9 32 54 11 21 42 9 11 7 -162 0 0 10 59 10 5 17 12 16 54 -12 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Data for the target star ------------------------ * name: TYC 2416-00772-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 36 41.4573 DE: +37 23 22.706 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .018 ) * V mag [mag]: 9.4 * B mag [mag]: 9.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (187) Lamberta approx. diameter [km]: 130 approx. diameter ["]: .086 distance from Earth [AU]: 2.08600 * orbital information: orbit source: Preston date of fit: 2007 Dec 06 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 864 number of rejected observations: 84 time covered by the observations: 1902 Sep 26 - 2007 Dec 06 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.012, 81° remarks: * orbital elements for (187) Lamberta : Mean anomaly = 252.47076469 deg Arg. of pericenter = 195.18610510 deg Long. of node = 21.89473264 deg Inclination = 10.59519259 deg Eccentricity = 0.23646835 Semimajor axis = 2.73258528 AU Perihelion dist = 2.08641535 AU Mag: H = 8.04, G = 0.15 Epoch of elements : MJD 54454.21500000 TDT (2007 Dec 20.215) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Dec 20 187 Lamberta 5h 10.2m UT 9.4 5 36 41.457 37 23 22.71TYC 2416-00772-1 9.5 12.6 130 8.9 2.086 -2.930 1.40 -81.799 37.389 101.77 -23.42 5.1705 -.00032 -.00635 -8.28433 0.33508 0.00036 -0.00144 2000 251.55107520071216.00000195.186105 21.894733 10.5951930.236468352.732585282.086415358.165 0.15 RATE 2.1819440 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.025 0.021 86.2 1.250 0.021 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 07, 03:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org