IOTA/IOTA-ES occultation update for (2617) Jiangxi / 2UCAC 43608980 event on 2010 Jan 06, 19:33 UT Visible from Russia, Europe Summary ------- On 2010 Jan 06 UT, the 53 km diameter asteroid (2617) Jiangxi will occult a 12.7 mag star in the constellation Gemini for observers along a path across Russia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.5 mag to 13.9 mag (the magnitude of the asteroid) for at most 4.7 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: UCAC. The event at a glimpse ---------------------- * Rank: 42 * date and approx. time of event: 2010 Jan 06, 19:23 - 2010 Jan 06, 19:42 UT * magnitude of target star: 12.7 * magnitude drop [mag]: 1.5 * estimated maximum duration [s]: 4.7 * Moon: 58 % sunlit, 81° distance * Sun: 168° distance * rough path description: Russia, Europe The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 1.58 * 1 sigma uncertainty interval [seconds]: +/- 8.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .097 +/- .067) * 1 sigma uncertainty ellipse (major, minor, PA): ( .097", .067", 89° ) * approx speed of asteroid's shadow [km/s]: 11.2329 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 43608980 by 2617 Jiangxi on 2010 Jan 6 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 - 36 0 0 28 9 54 19 42 41 4 54 -1 28 27 46 27 52 2 29 24 16 26 55 37 - 35 0 0 28 48 46 19 42 40 5 54 -2 29 6 32 28 31 0 30 2 45 27 34 53 - 34 0 0 29 26 48 19 42 39 6 55 -3 29 44 29 29 9 8 30 40 23 28 13 20 - 33 0 0 30 4 1 19 42 38 7 55 -4 30 21 36 29 46 27 31 17 12 28 50 56 - 32 0 0 30 40 25 19 42 36 9 56 -5 30 57 54 30 22 56 31 53 11 29 27 44 - 31 0 0 31 15 58 19 42 34 10 56 -6 31 33 22 30 58 35 32 28 22 30 3 41 - 30 0 0 31 50 43 19 42 33 11 57 -7 32 8 1 31 33 26 33 2 43 30 38 50 - 29 0 0 32 24 39 19 42 31 12 57 -8 32 41 51 32 7 28 33 36 15 31 13 9 - 28 0 0 32 57 47 19 42 29 13 58 -9 33 14 53 32 40 41 34 9 0 31 46 40 - 27 0 0 33 30 7 19 42 26 14 58 -10 33 47 7 33 13 6 34 40 56 32 19 23 - 26 0 0 34 1 38 19 42 24 15 59 -11 34 18 34 33 44 43 35 12 5 32 51 18 - 25 0 0 34 32 23 19 42 21 16 59 -12 34 49 13 34 15 34 35 42 27 33 22 25 - 24 0 0 35 2 21 19 42 19 16 60 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Uncertainty in time = +/- 10 secs Prediction of 2009 Dec 27.0 Data for the target star ------------------------ * name: 2UCAC 43608980 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 21 52.2069 DE: +33 45 20.724 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .049, .049 ) * V mag [mag]: 12.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2617) Jiangxi approx. diameter [km]: 53 approx. diameter ["]: .046 distance from Earth [AU]: 1.60600 * orbital information: orbit source: Preston date of fit: 2009 Dec 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 680 number of rejected observations: 24 time covered by the observations: 1975 Dec 02 - 2009 Nov 24 1 sigma uncertainty ellipse (major, minor, PA): 0.084, 0.045, 89° remarks: * orbital elements for (2617) Jiangxi : Mean anomaly = 28.60169501 deg Arg. of pericenter = 348.73940354 deg Long. of node = 73.61999037 deg Inclination = 12.90185455 deg Eccentricity = 0.23024820 Semimajor axis = 3.16228131 AU Perihelion dist = 2.43417173 AU Mag: H = 10.35, G = 0.15 Epoch of elements : MJD 55202.81500000 TDT (2010 Jan 06.815) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Jan 6 2617 Jiangxi 19h 33.3m UT 12.7 7 21 52.207 33 45 20.722UCAC 43608980 0.0 13.9 53 4.7 1.606 -2.485 15.67 70.8755 33.751 -111.83 -22.43 19.5546 0.03333 0.06569 -5.65682 2.86317 -0.00031 -0.00114 2000 28.1083152010 1 4.00000348.739404 73.619990 12.9018550.23024820 3.1622813 2.434171710.4 5.00.15 RATE 1.7526830 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.097 0.067 89 2.58 0.072 0 055192.0020100106_608980 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Dec 27, 12:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org