IOTA/IOTA-ES occultation update for (9845) Okamuraosamu / TYC 1355-00739-1 event on 2008 Jan 06, 11:41 UT Visible from E Russia Summary ------- On 2008 Jan 06 UT, the 11 km diameter asteroid (9845) Okamuraosamu will occult a 10.4 mag star in the constellation Gemini for observers along a path across E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.0 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: 8 * date and approx. time of event: 2008 Jan 06, 11:31 - 2008 Jan 06, 11:50 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 1.0 * Moon: 4 % sunlit, 152° distance * Sun: 175° distance * rough path description: E Russia The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 8.61 * 1 sigma uncertainty interval [seconds]: +/- 11.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .125 +/- .080) * 1 sigma uncertainty ellipse (major, minor, PA): ( .125", .080", 91° ) * approx speed of asteroid's shadow [km/s]: 10.8844 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1355-00739-1 by 9845 Okamuraosamu on 2008 Jan 06 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 82 0 0 39 50 2 11 50 9 0 66 -6 39 53 31 39 46 34 40 53 34 .. .. .. 83 0 0 40 11 0 11 50 9 1 66 -6 40 14 28 40 7 32 41 14 22 .. .. .. 84 0 0 40 31 32 11 50 9 2 67 -7 40 34 59 40 28 5 41 34 43 .. .. .. 85 0 0 40 51 37 11 50 9 3 67 -8 40 55 4 40 48 11 41 54 39 .. .. .. 86 0 0 41 11 16 11 50 8 3 68 -9 41 14 43 41 7 50 42 14 8 .. .. .. 87 0 0 41 30 30 11 50 8 4 69 -10 41 33 55 41 27 4 42 33 11 .. .. .. 88 0 0 41 49 17 11 50 7 5 69 -11 41 52 42 41 45 51 42 51 48 40 47 12 89 0 0 42 7 38 11 50 6 6 70 -11 42 11 2 42 4 13 43 9 59 41 5 43 90 0 0 42 25 33 11 50 5 7 71 -12 42 28 57 42 22 9 43 27 44 41 23 48 91 0 0 42 43 3 11 50 4 8 71 -13 42 46 26 42 39 39 43 45 4 41 41 27 92 0 0 43 0 7 11 50 3 8 72 -14 43 3 30 42 56 44 44 1 58 41 58 41 93 0 0 43 16 45 11 50 1 9 73 -15 43 20 8 43 13 23 44 18 27 42 15 29 94 0 0 43 32 59 11 50 0 10 73 -15 43 36 21 43 29 37 44 34 31 42 31 51 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25 43 11 31 52 3 289 1 - 0 22 21 - 0 29 5 0 35 53 .. .. .. - 80 0 0 - 0 47 28 11 31 52 2 289 2 - 0 44 7 - 0 50 50 0 13 59 .. .. .. - 79 0 0 - 1 8 45 11 31 51 1 289 3 - 1 5 24 - 1 12 7 - 0 7 26 .. .. .. - 78 0 0 - 1 29 34 11 31 51 0 289 4 - 1 26 13 - 1 32 55 - 0 28 24 .. .. .. Data for the target star ------------------------ * name: TYC 1355-00739-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 23 49.0329 DE: +18 45 41.987 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .020 ) * V mag [mag]: 10.4 * B mag [mag]: 10.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9845) Okamuraosamu approx. diameter [km]: 11 approx. diameter ["]: .010 distance from Earth [AU]: 1.50500 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 593 number of rejected observations: 10 time covered by the observations: 1976 Apr 03 - 2007 Dec 06 1 sigma uncertainty ellipse (major, minor, PA): 0.124, 0.077, 91° remarks: * orbital elements for (9845) Okamuraosamu : Mean anomaly = 319.24191413 deg Arg. of pericenter = 41.31449156 deg Long. of node = 121.83690957 deg Inclination = 8.21068533 deg Eccentricity = 0.16496030 Semimajor axis = 2.79524157 AU Perihelion dist = 2.33413767 AU Mag: H = 12.78, G = 0.15 Epoch of elements : MJD 54471.48700000 TDT (2008 Jan 06.487) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 06 9845 Okamuraosamu 11h 41.0m UT 10.4 7 23 49.033 18 45 41.99TYC 1355-00739-1 10.7 15.8 11 1.0 1.505 -2.345 13.42 -169.736 18.758 6.15 -22.54 11.6835 .12981 .32199 -5.69853 2.29534 -0.00041 0.00040 2000 318.9283062008 1 5.00000 41.314492121.836910 8.2106850.164960302.795241572.3341376712.75 0.15 RATE 2.1089930 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.125 0.080 91.0 9.610 0.087 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org