IOTA/IOTA-ES occultation update for (361) Bononia / TYC 1805-00792-1 event on 2008 Oct 17, 15:39 UT Visible from Japan, China, India Summary ------- On 2008 Oct 17 UT, the 142 km diameter asteroid (361) Bononia will occult a 12.0 mag star in the constellation Aries for observers along a path across Japan, China, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.3 mag (the magnitude of the asteroid) for at most 14.8 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: 97 * date and approx. time of event: 2008 Oct 17, 15:29 - 2008 Oct 17, 15:50 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 14.8 * Moon: 89 % sunlit, 7° distance * Sun: 147° distance * rough path description: Japan, China, India The occultation path -------------------- * approximate projected width [km]: 142 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .028", 70° ) * approx speed of asteroid's shadow [km/s]: 9.5583 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1805-00792-1 by 361 Bononia on 2008 Oct 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 51 0 0 13 26 16 15 50 29 0 62 -24 14 10 9 .. .. .. 14 43 28 .. .. .. 52 0 0 13 57 33 15 50 29 1 62 -25 14 41 17 13 13 44 15 14 30 12 40 23 53 0 0 14 28 18 15 50 28 2 62 -26 15 11 54 13 44 38 15 45 0 13 11 24 54 0 0 14 58 31 15 50 28 3 62 -27 15 41 58 14 15 0 16 14 57 13 41 52 55 0 0 15 28 11 15 50 27 4 63 -28 16 11 30 14 44 49 16 44 23 14 11 48 56 0 0 15 57 20 15 50 26 6 63 -29 16 40 30 15 14 6 17 13 16 14 41 12 57 0 0 16 25 55 15 50 24 7 63 -30 17 8 57 15 42 50 17 41 36 15 10 3 58 0 0 16 53 58 15 50 23 8 64 -31 17 36 51 16 11 2 18 9 24 15 38 21 59 0 0 17 21 28 15 50 21 9 64 -32 18 4 12 16 38 40 18 36 39 16 6 6 60 0 0 17 48 24 15 50 19 10 64 -33 18 31 0 17 5 45 19 3 20 16 33 17 61 0 0 18 14 47 15 50 17 11 64 -33 18 57 15 17 32 17 19 29 29 16 59 55 62 0 0 18 40 37 15 50 15 12 65 -34 19 22 56 17 58 15 19 55 4 17 26 0 63 0 0 19 5 54 15 50 12 13 65 -35 19 48 4 18 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4 32 39 1 53 10 -167 0 0 2 36 11 15 31 28 44 307 -21 3 21 32 1 50 47 3 55 58 1 16 13 -166 0 0 1 59 8 15 31 19 43 307 -20 2 44 33 1 13 39 3 19 2 0 39 1 -165 0 0 1 21 51 15 31 10 42 307 -18 2 7 21 0 36 18 2 41 53 0 1 37 -164 0 0 0 44 23 15 31 1 41 307 -17 1 29 56 - 0 1 14 2 4 31 - 0 35 58 -163 0 0 0 6 43 15 30 53 40 307 -16 0 52 20 - 0 38 57 1 26 58 - 1 13 44 -162 0 0 - 0 31 6 15 30 44 39 307 -15 0 14 34 - 1 16 50 0 49 14 - 1 51 39 -161 0 0 - 1 9 4 15 30 36 37 307 -14 - 0 23 21 - 1 54 51 0 11 21 - 2 29 42 -160 0 0 - 1 47 10 15 30 28 36 306 -13 - 1 1 24 - 2 33 0 - 0 26 40 - 3 7 53 -159 0 0 - 2 25 22 15 30 20 35 306 -12 - 1 39 34 - 3 11 15 - 1 4 48 - 3 46 10 -158 0 0 - 3 3 40 15 30 12 34 306 -11 - 2 17 49 - 3 49 34 - 1 43 2 - 4 24 31 -157 0 0 - 3 42 2 15 30 5 33 306 -10 - 2 56 9 - 4 27 58 - 2 21 20 - 5 2 56 -156 0 0 - 4 20 27 15 29 58 32 306 -9 - 3 34 33 - 5 6 25 - 2 59 43 - 5 41 24 -155 0 0 - 4 58 53 15 29 51 30 306 -8 - 4 12 58 - 5 44 53 - 3 38 7 - 6 19 53 -154 0 0 - 5 37 21 15 29 44 29 306 -7 - 4 51 25 - 6 23 21 - 4 16 33 - 6 58 22 -153 0 0 - 6 15 48 15 29 37 28 306 -6 - 5 29 51 - 7 1 49 - 4 54 59 - 7 36 50 -152 0 0 - 6 54 13 15 29 31 27 306 -5 - 6 8 16 - 7 40 14 - 5 33 24 - 8 15 16 -151 0 0 - 7 32 35 15 29 25 26 305 -4 - 6 46 39 - 8 18 36 - 6 11 46 - 8 53 38 -150 0 0 - 8 10 53 15 29 19 25 305 -3 - 7 24 57 - 8 56 54 - 6 50 5 - 9 31 55 -149 0 0 - 8 49 6 15 29 14 23 305 -1 - 8 3 10 - 9 35 5 - 7 28 19 -10 10 6 -148 0 0 - 9 27 12 15 29 9 22 305 0 - 8 41 18 -10 13 10 - 8 6 27 -10 48 10 Uncertainty in time = +/- 7 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 1805-00792-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 27 56.8466 DE: +27 24 25.632 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .022 ) * V mag [mag]: 12.0 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (361) Bononia approx. diameter [km]: 142 approx. diameter ["]: .083 distance from Earth [AU]: 2.36300 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 640 number of rejected observations: 78 time covered by the observations: 1901 Mar 25 - 2008 Sep 25 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.018, 65° remarks: * orbital elements for (361) Bononia : Mean anomaly = 334.39090378 deg Arg. of pericenter = 67.96898935 deg Long. of node = 18.96461221 deg Inclination = 12.62837301 deg Eccentricity = 0.21278786 Semimajor axis = 3.95885856 AU Perihelion dist = 3.11646153 AU Mag: H = 8.32, G = 0.15 Epoch of elements : MJD 54756.65200000 TDT (2008 Oct 17.652) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 17 361 Bononia 15h 39.4m UT 12.0 3 27 56.847 27 24 25.63TYC 1805-00792-1 12.5 13.3 142 14.8 2.363 -1.422 6.70 150.6260 27.405 -58.54 -9.55 15.6565 -0.02556 -0.07354 -5.08523 1.80173 -0.00285 -0.00147 2000 333.55856320081011.00000 67.968989 18.964612 12.6283730.21278786 3.9588586 3.1164615 8.2 5.00.15 RATE 1.2512640 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.028 70 1.38 0.032 0 54740.5020081017_0792-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 05:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org