IOTA/IOTA-ES occultation update for (585) Bilkis / TYC 0763-00212-1 event on 2008 Jan 03, 07:36 UT Visible from Brazil, Bolivia Summary ------- On 2008 Jan 03 UT, the 58 km diameter asteroid (585) Bilkis will occult a 11.6 mag star in the constellation Canis Minor for observers along a path across Brazil, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.0 mag (the magnitude of the asteroid) for at most 6.6 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: 96 * date and approx. time of event: 2008 Jan 03, 07:24 - 2008 Jan 03, 07:47 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 6.6 * Moon: 23 % sunlit, 113° distance * Sun: 165° distance * rough path description: Brazil, Bolivia The occultation path -------------------- * approximate projected width [km]: 62 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .027", 94° ) * approx speed of asteroid's shadow [km/s]: 8.8414 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0763-00212-1 by 585 Bilkis on 2008 Jan 03 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 163 0 0 -12 16 14 7 47 22 0 81 -3 -11 59 14 -12 33 16 .. .. .. -12 47 15 164 0 0 -12 6 50 7 47 22 1 81 -4 -11 49 51 -12 23 52 .. .. .. -12 37 51 165 0 0 -11 57 36 7 47 22 2 80 -5 -11 40 37 -12 14 37 -11 26 43 -12 28 36 166 0 0 -11 48 32 7 47 21 3 80 -6 -11 31 34 -12 5 33 -11 17 40 -12 19 31 167 0 0 -11 39 38 7 47 20 4 80 -7 -11 22 40 -11 56 38 -11 8 47 -12 10 36 168 0 0 -11 30 55 7 47 19 5 80 -8 -11 13 57 -11 47 54 -11 0 4 -12 1 51 169 0 0 -11 22 22 7 47 18 6 80 -9 -11 5 25 -11 39 20 -10 51 32 -11 53 17 170 0 0 -11 13 59 7 47 16 7 79 -10 -10 57 3 -11 30 57 -10 43 10 -11 44 54 171 0 0 -11 5 47 7 47 15 8 79 -11 -10 48 51 -11 22 45 -10 35 0 -11 36 41 172 0 0 -10 57 46 7 47 13 9 79 -12 -10 40 51 -11 14 44 -10 26 59 -11 28 39 173 0 0 -10 49 56 7 47 10 10 79 -13 -10 33 1 -11 6 53 -10 19 10 -11 20 48 174 0 0 -10 42 17 7 47 8 11 79 -14 -10 25 23 -10 59 14 -10 11 32 -11 13 8 175 0 0 -10 34 49 7 47 5 12 78 -14 -10 17 55 -10 51 45 -10 4 5 -11 5 40 176 0 0 -10 27 33 7 47 3 13 78 -15 -10 10 39 -10 44 28 - 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29 0 0 -25 39 38 7 24 59 10 285 2 -25 22 32 -25 56 46 -25 8 32 -26 10 50 - 28 0 0 -25 50 22 7 24 57 9 284 3 -25 33 16 -26 7 29 -25 19 16 -26 21 33 - 27 0 0 -26 0 59 7 24 55 8 284 4 -25 43 54 -26 18 6 -25 29 55 -26 32 10 - 26 0 0 -26 11 31 7 24 53 7 284 5 -25 54 26 -26 28 37 -25 40 27 -26 42 41 - 25 0 0 -26 21 55 7 24 52 6 283 6 -26 4 51 -26 39 2 -25 50 52 -26 53 5 - 24 0 0 -26 32 13 7 24 51 5 283 7 -26 15 9 -26 49 20 -26 1 11 -27 3 22 - 23 0 0 -26 42 25 7 24 50 4 282 8 -26 25 21 -26 59 30 -26 11 23 -27 13 33 - 22 0 0 -26 52 29 7 24 49 3 282 9 -26 35 25 -27 9 34 -26 21 28 -27 23 36 - 21 0 0 -27 2 26 7 24 48 2 281 9 -26 45 23 -27 19 30 -26 31 25 -27 33 32 - 20 0 0 -27 12 15 7 24 48 2 281 10 -26 55 13 -27 29 19 -26 41 15 -27 43 21 - 19 0 0 -27 21 57 7 24 48 1 280 11 -27 4 55 -27 39 1 -26 50 58 -27 53 2 Data for the target star ------------------------ * name: TYC 0763-00212-1 * constellation : Canis Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 19 10.6832 DE: +08 58 22.113 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 11.6 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (585) Bilkis approx. diameter [km]: 58 approx. diameter ["]: .066 distance from Earth [AU]: 1.21600 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 941 number of rejected observations: 80 time covered by the observations: 1906 Feb 16 - 2007 Nov 24 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.018, 96° remarks: * orbital elements for (585) Bilkis : Mean anomaly = 327.32248171 deg Arg. of pericenter = 327.90216947 deg Long. of node = 180.36971931 deg Inclination = 7.55620722 deg Eccentricity = 0.12948350 Semimajor axis = 2.43082310 AU Perihelion dist = 2.11607163 AU Mag: H = 10.29, G = 0.15 Epoch of elements : MJD 54468.31700000 TDT (2008 Jan 03.317) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 03 585 Bilkis 7h 36.1m UT 11.6 7 19 10.683 8 58 22.11TYC 0763-00212-1 12.4 13.0 58 6.6 1.216 -2.415 4.81 -106.538 8.971 67.03 -22.87 7.6013 -.04537 -.33958 -4.94596 0.66389 -0.00062 0.00137 2000 325.15956020071226.00000327.902169180.369719 7.5562070.129483502.430823102.1160716310.45 0.15 RATE 2.6006030 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.040 0.027 94.4 1.410 0.027 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 04:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org