IOTA/IOTA-ES occultation update for (3495) Colchagua / HIP 45989 event on 2008 Jan 11, 00:23 UT Visible from Africa, Madagascar Summary ------- On 2008 Jan 11 UT, the 17 km diameter asteroid (3495) Colchagua will occult a 7.8 mag star in the constellation Leo for observers along a path across Africa, Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.5 mag to 16.3 mag (the magnitude of the asteroid) for at most 1.7 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 11, 00:13 - 2008 Jan 11, 00:32 UT * magnitude of target star: 7.8 * magnitude drop [mag]: 8.5 * estimated maximum duration [s]: 1.7 * Moon: 7 % sunlit, 178° distance * Sun: 152° distance * rough path description: Africa, Madagascar The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 5.22 * 1 sigma uncertainty interval [seconds]: +/- 12.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .074 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .075", .052", 105° ) * approx speed of asteroid's shadow [km/s]: 9.9731 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 45989 by 3495 Colchagua on 2008 Jan 11 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 - 66 0 0 - 2 12 7 0 32 54 1 74 -27 - 2 6 48 - 2 17 25 .. .. .. - 3 13 7 - 65 0 0 - 1 55 41 0 32 54 2 74 -28 - 1 50 23 - 2 0 59 .. .. .. - 2 56 32 - 64 0 0 - 1 39 46 0 32 53 3 74 -29 - 1 34 29 - 1 45 3 .. .. .. - 2 40 29 - 63 0 0 - 1 24 22 0 32 52 4 74 -30 - 1 19 6 - 1 29 39 .. .. .. - 2 24 57 - 62 0 0 - 1 9 30 0 32 51 5 74 -31 - 1 4 14 - 1 14 46 .. .. .. - 2 9 57 - 61 0 0 - 0 55 9 0 32 50 6 74 -32 - 0 49 54 - 1 0 24 .. .. .. - 1 55 28 - 60 0 0 - 0 41 19 0 32 49 7 74 -33 - 0 36 5 - 0 46 33 0 18 22 - 1 41 31 - 59 0 0 - 0 28 1 0 32 47 8 74 -34 - 0 22 47 - 0 33 14 0 31 33 - 1 28 5 - 58 0 0 - 0 15 13 0 32 45 9 74 -35 - 0 10 0 - 0 20 27 0 44 13 - 1 15 10 - 57 0 0 - 0 2 58 0 32 43 10 74 -36 0 2 15 - 0 8 10 0 56 23 - 1 2 48 - 56 0 0 0 8 47 0 32 41 11 74 -37 0 13 59 0 3 35 1 8 1 - 0 50 57 - 55 0 0 0 20 0 0 32 39 12 74 -38 0 25 11 0 14 49 1 19 8 - 0 39 37 - 54 0 0 0 30 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.. .. .. .. .. -45 22 55 .. .. .. .. .. .. .. .. .. Data for the target star ------------------------ * name: HIP 45989 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 22 46.1903 DE: +15 46 35.399 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .018, .009 ) * V mag [mag]: 7.8 * B mag [mag]: 7.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3495) Colchagua approx. diameter [km]: 17 approx. diameter ["]: .010 distance from Earth [AU]: 2.28200 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 933 number of rejected observations: 22 time covered by the observations: 1935 May 29 - 2007 Nov 18 1 sigma uncertainty ellipse (major, minor, PA): 0.073, 0.051, 106° remarks: * orbital elements for (3495) Colchagua : Mean anomaly = 281.65394196 deg Arg. of pericenter = 98.92863359 deg Long. of node = 123.14572463 deg Inclination = 2.47353311 deg Eccentricity = 0.12176249 Semimajor axis = 3.21558335 AU Perihelion dist = 2.82404592 AU Mag: H = 11.62, G = 0.15 Epoch of elements : MJD 54476.01600000 TDT (2008 Jan 11.016) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 11 3495 Colchagua 0h 23.2m UT 7.8 9 22 46.190 15 46 35.40HIP 45989 7.9 16.3 17 1.7 2.282 -1.389 8.32 24.983 15.774 176.08 -21.93 0.3872 -.16132 -.39056 -5.19929 2.15738 -0.00272 0.00084 2000 280.6256362008 1 5.00000 98.928634123.145725 2.4735330.121762493.215583352.8240459211.45 0.15 RATE 1.7092850 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.075 0.052 105.1 6.220 0.054 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org