IOTA/IOTA-ES occultation update for (4103) Chahine / TYC 1790-00021-1 event on 2009 Oct 10, 00:45 UT Visible from Summary ------- On 2009 Oct 10 UT, the 13 km diameter asteroid (4103) Chahine will occult a 8.6 mag star in the constellation Aries for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 13.8 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: 6 * date and approx. time of event: 2009 Oct 10, 00:38 - 2009 Oct 10, 00:53 UT * magnitude of target star: 8.6 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 1.0 * Moon: 64 % sunlit, 41° distance * Sun: 145° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 11.37 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .147 +/- .132) * 1 sigma uncertainty ellipse (major, minor, PA): ( .183", .073", 49° ) * approx speed of asteroid's shadow [km/s]: 13.2012 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1790-00021-1 by 4103 Chahine on 2009 Oct 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 ' " Longitude Longitude Longitude Longitude 75 29 53 - 7 0 0 0 38 55 23 304 -1 75 35 25 75 24 22 77 42 54 73 20 9 74 25 33 - 6 0 0 0 39 0 25 304 -2 74 31 1 74 20 6 76 36 39 72 17 30 73 22 42 - 5 0 0 0 39 6 26 304 -3 73 28 5 73 17 19 75 32 4 71 16 11 72 21 14 - 4 0 0 0 39 11 27 304 -4 72 26 33 72 15 54 74 29 1 70 16 7 71 21 2 - 3 0 0 0 39 17 29 304 -5 71 26 18 71 15 46 73 27 23 69 17 11 70 22 1 - 2 0 0 0 39 23 30 304 -6 70 27 14 70 16 48 72 27 4 68 19 20 69 24 6 - 1 0 0 0 39 30 31 303 -7 69 29 16 69 18 56 71 27 58 67 22 27 68 27 12 0 0 0 0 39 36 33 303 -8 68 32 19 68 22 4 70 30 0 66 26 30 67 31 15 1 0 0 0 39 43 34 303 -9 67 36 20 67 26 10 69 33 5 65 31 24 Latitude Latitude Latitude Latitude 66 0 0 2 39 54 0 39 55 36 302 -11 2 45 29 2 34 20 4 53 49 0 28 45 65 0 0 3 46 57 0 40 3 38 302 -12 3 52 35 3 41 19 6 2 8 1 34 35 64 0 0 4 55 0 0 40 11 39 302 -13 5 0 41 4 49 19 7 11 28 2 41 27 63 0 0 6 4 1 0 40 19 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Uncertainty in time = +/- 11 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 1790-00021-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 58 15.5144 DE: +27 20 10.594 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .014, .018 ) * V mag [mag]: 8.6 * B mag [mag]: 9.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4103) Chahine approx. diameter [km]: 13 approx. diameter ["]: .016 distance from Earth [AU]: 1.10800 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 573 number of rejected observations: 5 time covered by the observations: 1949 Apr 04 - 2008 Mar 15 1 sigma uncertainty ellipse (major, minor, PA): 0.183, 0.071, 49° remarks: * orbital elements for (4103) Chahine : Mean anomaly = 29.69905977 deg Arg. of pericenter = 328.87061321 deg Long. of node = 23.26978156 deg Inclination = 26.99037439 deg Eccentricity = 0.19174029 Semimajor axis = 2.38003245 AU Perihelion dist = 1.92368433 AU Mag: H = 11.17, G = 0.15 Epoch of elements : MJD 55114.03200000 TDT (2009 Oct 10.032) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 10 4103 Chahine 0h 45.7m UT 8.6 2 58 15.514 27 20 10.59TYC 1790-00021-1 9.2 13.8 13 1.0 1.108 -3.161 41.53 14.3674 27.325 165.34 -6.62 0.7622 0.25068 0.25378 -5.30399 5.23325 -0.00259 -0.00158 2000 28.616753200910 6.00000328.870613 23.269782 26.9903740.19174029 2.3800325 1.923684311.2 5.00.15 RATE 2.6842920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.183 0.073 49 12.37 0.184 0 54581.5020091010_0021-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org