IOTA/IOTA-ES occultation update for (5293) Bentengahama / TYC 1323-01971-1 event on 2008 Jan 10, 13:51 UT Visible from China Summary ------- On 2008 Jan 10 UT, the 16 km diameter asteroid (5293) Bentengahama will occult a 9.2 mag star in the constellation Gemini for observers along a path across China. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 14.7 mag (the magnitude of the asteroid) for at most 1.4 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: . The event at a glimpse ---------------------- * Rank: 13 * date and approx. time of event: 2008 Jan 10, 13:42 - 2008 Jan 10, 14:01 UT * magnitude of target star: 9.2 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.4 * Moon: 5 % sunlit, 141° distance * Sun: 165° distance * rough path description: China The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 5.18 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .090 +/- .069) * 1 sigma uncertainty ellipse (major, minor, PA): ( .091", .069", 81° ) * approx speed of asteroid's shadow [km/s]: 11.1506 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1323-01971-1 by 5293 Bentengahama on 2008 Jan 10 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 36 0 0 27 37 24 14 1 13 0 68 10 27 42 4 27 32 44 28 30 20 .. .. .. 37 0 0 27 58 18 14 1 13 1 69 10 28 2 56 27 53 39 28 51 3 27 5 30 38 0 0 28 18 36 14 1 12 2 69 9 28 23 13 28 13 58 29 11 11 27 25 59 39 0 0 28 38 18 14 1 12 3 70 8 28 42 55 28 33 42 29 30 43 27 45 52 40 0 0 28 57 26 14 1 11 4 70 7 29 2 2 28 52 50 29 49 41 28 5 10 41 0 0 29 15 59 14 1 11 5 71 6 29 20 34 29 11 24 30 8 4 28 23 53 42 0 0 29 33 58 14 1 10 6 71 5 29 38 32 29 29 23 30 25 53 28 42 1 43 0 0 29 51 22 14 1 9 7 72 4 29 55 55 29 46 48 30 43 7 28 59 34 44 0 0 30 8 12 14 1 8 8 72 3 30 12 44 30 3 39 30 59 48 29 16 34 45 0 0 30 24 28 14 1 6 9 73 2 30 28 59 30 19 56 31 15 55 29 32 59 46 0 0 30 40 10 14 1 5 9 73 1 30 44 41 30 35 39 31 31 29 29 48 50 47 0 0 30 55 19 14 1 3 10 74 1 30 59 50 30 50 49 31 46 30 30 4 7 48 0 0 31 9 55 14 1 2 11 74 0 31 14 25 31 5 26 32 0 58 30 18 51 49 0 0 31 23 58 14 1 0 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-143 0 0 -27 56 28 13 42 10 3 293 -13 -27 51 45 -28 1 11 -27 2 51 -28 50 6 -142 0 0 -28 19 11 13 42 10 2 293 -12 -28 14 29 -28 23 53 -27 25 45 -29 12 38 -141 0 0 -28 41 20 13 42 10 1 292 -11 -28 36 39 -28 46 1 -27 48 5 -29 34 36 -140 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -28 9 50 .. .. .. Data for the target star ------------------------ * name: TYC 1323-01971-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 23 02.9532 DE: +19 14 06.733 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .030, .035 ) * V mag [mag]: 9.2 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5293) Bentengahama approx. diameter [km]: 16 approx. diameter ["]: .015 distance from Earth [AU]: 1.42400 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 469 number of rejected observations: 7 time covered by the observations: 1978 Mar 06 - 2007 Dec 07 1 sigma uncertainty ellipse (major, minor, PA): 0.086, 0.059, 80° remarks: * orbital elements for (5293) Bentengahama : Mean anomaly = 342.99594917 deg Arg. of pericenter = 11.12493765 deg Long. of node = 111.10750362 deg Inclination = 13.95150921 deg Eccentricity = 0.11130290 Semimajor axis = 2.66961485 AU Perihelion dist = 2.37247897 AU Mag: H = 11.53, G = 0.15 Epoch of elements : MJD 54475.57700000 TDT (2008 Jan 10.577) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 10 5293 Bentengahama 13h 51.7m UT 9.2 6 23 2.953 19 14 6.73TYC 1323-01971-1 10.5 14.7 16 1.4 1.424 -2.377 19.38 -221.629 19.230 -26.08 -21.99 13.8615 -.00695 -.01185 -5.45511 3.13884 0.00145 0.00035 2000 341.7357712008 1 5.00000 11.124938111.107504 13.9515090.111302902.669614852.3724789711.65 0.15 RATE 2.2595980 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.091 0.069 81.1 6.180 0.080 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org