IOTA/IOTA-ES occultation update for (85) Io / TYC 5771-01598-1 event on 2008 Jan 10, 10:25 UT Visible from Indonesia Summary ------- On 2008 Jan 10 UT, the 155 km diameter asteroid (85) Io will occult a 9.3 mag star in the constellation Aquarius for observers along a path across Indonesia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 12.4 mag (the magnitude of the asteroid) for at most 3.2 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: 99 * date and approx. time of event: 2008 Jan 10, 10:23 - 2008 Jan 10, 10:27 UT * magnitude of target star: 9.3 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 3.2 * Moon: 4 % sunlit, 8° distance * Sun: 27° distance * rough path description: Indonesia The occultation path -------------------- * approximate projected width [km]: 155 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .022", 89° ) * approx speed of asteroid's shadow [km/s]: 48.9452 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5771-01598-1 by 85 Io on 2008 Jan 10 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 - 40 0 0 -11 47 11 10 23 9 1 99 26 -12 29 47 -11 4 35 -12 56 11 -10 38 10 - 39 0 0 -11 56 43 10 23 9 2 99 27 -12 39 16 -11 14 8 -13 5 40 -10 47 44 - 38 0 0 -12 6 0 10 23 10 3 99 28 -12 48 32 -11 23 27 -13 14 54 -10 57 4 - 37 0 0 -12 15 3 10 23 10 4 99 29 -12 57 33 -11 32 31 -13 23 55 -11 6 9 - 36 0 0 -12 23 51 10 23 10 5 98 30 -13 6 20 -11 41 21 -13 32 41 -11 15 0 - 35 0 0 -12 32 25 10 23 10 6 98 31 -13 14 53 -11 49 57 -13 41 13 -11 23 37 - 34 0 0 -12 40 45 10 23 10 7 98 32 -13 23 11 -11 58 18 -13 49 30 -11 31 59 - 33 0 0 -12 48 50 10 23 11 8 98 33 -13 31 14 -12 6 24 -13 57 32 -11 40 6 - 32 0 0 -12 56 39 10 23 11 9 98 34 -13 39 3 -12 14 16 -14 5 20 -11 47 58 - 31 0 0 -13 4 14 10 23 11 10 97 35 -13 46 37 -12 21 52 -14 12 53 -11 55 35 - 30 0 0 -13 11 34 10 23 12 11 97 36 -13 53 55 -12 29 13 -14 20 10 -12 2 57 - 29 0 0 -13 18 39 10 23 12 12 97 37 -14 0 59 -12 36 19 -14 27 13 -12 10 4 - 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Data for the target star ------------------------ * name: TYC 5771-01598-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 04 30.2146 DE: -09 15 56.426 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .022 ) * V mag [mag]: 9.3 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (85) Io approx. diameter [km]: 155 approx. diameter ["]: .072 distance from Earth [AU]: 2.97100 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 914 number of rejected observations: 161 time covered by the observations: 1904 Oct 09 - 2007 Oct 12 1 sigma uncertainty ellipse (major, minor, PA): 0.009, 0.005, 80° remarks: * orbital elements for (85) Io : Mean anomaly = 1.09850843 deg Arg. of pericenter = 122.10874397 deg Long. of node = 203.40504034 deg Inclination = 11.95856683 deg Eccentricity = 0.19171370 Semimajor axis = 2.65340476 AU Perihelion dist = 2.14471070 AU Mag: H = 7.58, G = 0.15 Epoch of elements : MJD 54475.43400000 TDT (2008 Jan 10.434) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 10 85 Io 10h 25.3m UT 9.3 21 4 30.215- 9 15 56.43TYC 5771-01598-1 10.2 12.4 155 3.2 2.971 5.393 17.65 50.466 -9.271 25.49 -22.01 10.4221 -.00334 .01230 26.97475 5.96318 0.00221 0.00133 2000 359.8593732008 1 5.00000122.108744203.405040 11.9585670.191713702.653404762.144710707.615 0.15 RATE 2.2803364 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.027 0.022 88.9 1.310 0.022 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org