IOTA/IOTA-ES occultation update for (1649) Fabre / TYC 0719-01097-1 event on 2008 Jan 04, 18:30 UT Visible from S Africa Summary ------- On 2008 Jan 04 UT, the 28 km diameter asteroid (1649) Fabre will occult a 9.3 mag star in the constellation Orion for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.3 mag to 16.6 mag (the magnitude of the asteroid) for at most 2.3 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: UCAC. The event at a glimpse ---------------------- * Rank: 25 * date and approx. time of event: 2008 Jan 04, 18:24 - 2008 Jan 04, 18:36 UT * magnitude of target star: 9.3 * magnitude drop [mag]: 7.3 * estimated maximum duration [s]: 2.3 * Moon: 13 % sunlit, 148° distance * Sun: 160° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 2.70 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .061", .050", 86° ) * approx speed of asteroid's shadow [km/s]: 12.2925 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0719-01097-1 by 1649 Fabre on 2008 Jan 04 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 - 18 0 0 -31 23 40 18 36 36 1 77 20 -31 12 12 -31 35 11 .. .. .. -32 38 6 - 17 0 0 -31 12 42 18 36 36 1 77 19 -31 1 15 -31 24 12 .. .. .. -32 27 0 - 16 0 0 -31 2 7 18 36 36 2 76 18 -30 50 41 -31 13 35 .. .. .. -32 16 17 - 15 0 0 -30 51 56 18 36 35 3 76 17 -30 40 31 -31 3 23 .. .. .. -32 5 58 - 14 0 0 -30 42 8 18 36 35 4 75 16 -30 30 44 -30 53 34 .. .. .. -31 56 2 - 13 0 0 -30 32 44 18 36 34 5 75 15 -30 21 21 -30 44 9 .. .. .. -31 46 31 - 12 0 0 -30 23 44 18 36 33 6 74 15 -30 12 22 -30 35 8 .. .. .. -31 37 24 - 11 0 0 -30 15 8 18 36 31 7 74 14 -30 3 48 -30 26 31 .. .. .. -31 28 42 - 10 0 0 -30 6 56 18 36 30 8 73 13 -29 55 37 -30 18 18 -28 55 9 -31 20 24 - 9 0 0 -29 59 9 18 36 28 8 73 12 -29 47 51 -30 10 30 -28 47 28 -31 12 31 - 8 0 0 -29 51 46 18 36 26 9 72 11 -29 40 29 -30 3 6 -28 40 10 -31 5 2 - 7 0 0 -29 44 48 18 36 25 10 72 10 -29 33 31 -29 56 7 -28 33 17 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Data for the target star ------------------------ * name: TYC 0719-01097-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 50 05.8897 DE: +10 38 41.529 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 9.3 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1649) Fabre approx. diameter [km]: 28 approx. diameter ["]: .019 distance from Earth [AU]: 2.00700 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 658 number of rejected observations: 11 time covered by the observations: 1930 Feb 24 - 2007 Dec 17 1 sigma uncertainty ellipse (major, minor, PA): 0.058, 0.046, 85° remarks: * orbital elements for (1649) Fabre : Mean anomaly = 300.52729811 deg Arg. of pericenter = 11.28518307 deg Long. of node = 145.75364396 deg Inclination = 10.81332099 deg Eccentricity = 0.05071406 Semimajor axis = 3.02036880 AU Perihelion dist = 2.86719362 AU Mag: H = 11.98, G = 0.15 Epoch of elements : MJD 54469.77100000 TDT (2008 Jan 04.771) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 04 1649 Fabre 18h 30.7m UT 9.3 5 50 5.890 10 38 41.53TYC 0719-01097-1 11.1 16.6 28 2.3 2.007 -1.989 7.96 66.095 10.642 263.53 -22.73 18.5122 -.19186 -.70668 -6.69657 1.81514 0.00163 0.00131 2000 298.69264820071226.00000 11.285183145.753644 10.8133210.050714063.020368802.8671936212.25 0.15 RATE 1.8776480 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.061 0.050 85.5 3.700 0.052 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org