IOTA/IOTA-ES occultation update for (296) Phaetusa / TYC 1325-01203-1 event on 2008 Jan 07, 09:23 UT Visible from Mexico, Central America, Colombia Summary ------- On 2008 Jan 07 UT, the 10 km diameter asteroid (296) Phaetusa will occult a 8.5 mag star in the constellation Gemini for observers along a path across Mexico, Central America, Colombia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.3 mag to 14.8 mag (the magnitude of the asteroid) for at most 1.2 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: 20 * date and approx. time of event: 2008 Jan 07, 09:10 - 2008 Jan 07, 09:35 UT * magnitude of target star: 8.5 * magnitude drop [mag]: 6.3 * estimated maximum duration [s]: 1.2 * Moon: 1 % sunlit, 174° distance * Sun: 165° distance * rough path description: Mexico, Central America, Colombia The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 3.37 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .040", 89° ) * approx speed of asteroid's shadow [km/s]: 8.5793 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1325-01203-1 by 296 Phaetusa on 2008 Jan 07 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 107 0 0 11 38 1 9 35 31 0 67 14 11 40 58 11 35 3 12 0 53 .. .. .. 108 0 0 12 2 37 9 35 31 1 68 13 12 5 34 11 59 40 12 25 28 11 39 46 109 0 0 12 27 3 9 35 31 2 68 12 12 30 0 12 24 7 12 49 54 12 4 14 110 0 0 12 51 20 9 35 30 3 68 11 12 54 17 12 48 23 13 14 9 12 28 32 111 0 0 13 15 26 9 35 29 4 68 10 13 18 23 13 12 30 13 38 14 12 52 39 112 0 0 13 39 21 9 35 28 5 68 9 13 42 18 13 36 25 14 2 8 13 16 36 113 0 0 14 3 5 9 35 27 6 69 8 14 6 1 14 0 9 14 25 51 13 40 20 114 0 0 14 26 37 9 35 25 7 69 7 14 29 33 14 23 40 14 49 21 14 3 53 115 0 0 14 49 56 9 35 23 8 69 6 14 52 52 14 47 0 15 12 39 14 27 14 116 0 0 15 13 2 9 35 21 9 69 5 15 15 58 15 10 7 15 35 44 14 50 22 117 0 0 15 35 56 9 35 19 11 70 4 15 38 51 15 33 0 15 58 36 15 13 17 118 0 0 15 58 35 9 35 16 12 70 3 16 1 31 15 55 40 16 21 14 15 35 58 119 0 0 16 21 1 9 35 13 13 70 2 16 23 56 16 18 6 16 43 38 15 58 25 120 0 0 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Data for the target star ------------------------ * name: TYC 1325-01203-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 07 05.6808 DE: +22 10 17.990 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .016 ) * V mag [mag]: 8.5 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (296) Phaetusa approx. diameter [km]: 10 approx. diameter ["]: .012 distance from Earth [AU]: 1.17100 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 815 number of rejected observations: 44 time covered by the observations: 1930 Dec 24 - 2007 Dec 18 1 sigma uncertainty ellipse (major, minor, PA): 0.056, 0.037, 89° remarks: * orbital elements for (296) Phaetusa : Mean anomaly = 66.20014601 deg Arg. of pericenter = 252.61127264 deg Long. of node = 121.58750670 deg Inclination = 1.74679113 deg Eccentricity = 0.15996768 Semimajor axis = 2.22902773 AU Perihelion dist = 1.87245534 AU Mag: H = 12.37, G = 0.15 Epoch of elements : MJD 54472.39100000 TDT (2008 Jan 07.391) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 07 296 Phaetusa 9h 23.2m UT 8.5 6 7 5.681 22 10 17.99TYC 1325-01203-1 10.0 14.8 10 1.2 1.171 -2.604 3.51 -155.361 22.171 40.70 -22.43 9.3871 .01129 .11998 -4.81983 0.46719 0.00143 0.00010 2000 65.49202022008 1 5.00000252.611273121.587507 1.7467910.159967682.229027731.8724553412.35 0.15 RATE 2.9616304 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.058 0.040 89.1 4.370 0.040 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org