IOTA/IOTA-ES occultation update for (410) Chloris / TYC 1955-00429-1 event on 2009 Feb 07, 15:51 UT Visible from Summary ------- On 2009 Feb 07 UT, the 124 km diameter asteroid (410) Chloris will occult a 9.7 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 12.7 mag (the magnitude of the asteroid) for at most 8.3 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: 2009 Feb 07, 15:44 - 2009 Feb 07, 15:58 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 8.3 * Moon: 94 % sunlit, 24° distance * Sun: 169° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .025", 95° ) * approx speed of asteroid's shadow [km/s]: 14.9773 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1955-00429-1 by 410 Chloris on 2009 Feb 7 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 30 0 0 15 5 32 15 58 30 5 64 0 15 43 24 14 27 34 16 7 36 14 3 12 31 0 0 15 32 12 15 58 29 6 64 -1 16 9 55 14 54 23 16 34 1 14 30 7 32 0 0 15 58 12 15 58 28 7 65 -2 16 35 47 15 20 32 16 59 46 14 56 22 33 0 0 16 23 33 15 58 27 8 65 -3 17 0 58 15 46 2 17 24 52 15 21 58 34 0 0 16 48 14 15 58 26 9 65 -4 17 25 30 16 10 51 17 49 19 15 46 53 35 0 0 17 12 15 15 58 25 10 65 -5 17 49 23 16 35 1 18 13 6 16 11 8 36 0 0 17 35 37 15 58 24 11 66 -6 18 12 37 16 58 32 18 36 15 16 34 44 37 0 0 17 58 20 15 58 22 12 66 -7 18 35 12 17 21 23 18 58 44 16 57 41 38 0 0 18 20 24 15 58 20 13 66 -8 18 57 7 17 43 35 19 20 35 17 19 58 39 0 0 18 41 49 15 58 19 14 67 -9 19 18 24 18 5 7 19 41 47 17 41 36 40 0 0 19 2 35 15 58 17 15 67 -10 19 39 3 18 26 1 20 2 21 18 2 34 41 0 0 19 22 42 15 58 15 16 67 -11 19 59 3 18 46 16 20 22 16 18 22 54 42 0 0 19 42 12 15 58 13 17 68 -12 20 18 25 19 5 53 20 41 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Uncertainty in time = +/- 3 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 1955-00429-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 18 30.0938 DE: +26 12 13.440 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 9.7 * B mag [mag]: 10.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (410) Chloris approx. diameter [km]: 124 approx. diameter ["]: .081 distance from Earth [AU]: 2.10200 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 895 number of rejected observations: 83 time covered by the observations: 1910 Mar 08 - 2008 Apr 14 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.017, 99° remarks: * orbital elements for (410) Chloris : Mean anomaly = 249.00908484 deg Arg. of pericenter = 172.14347108 deg Long. of node = 97.20285257 deg Inclination = 10.92181675 deg Eccentricity = 0.23637552 Semimajor axis = 2.72948956 AU Perihelion dist = 2.08430506 AU Mag: H = 8.16, G = 0.15 Epoch of elements : MJD 54869.66100000 TDT (2009 Feb 07.661) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 7 410 Chloris 15h 51.6m UT 9.7 9 18 30.094 26 12 13.44TYC 1955-00429-1 10.4 12.7 124 8.3 2.102 -2.358 15.61 123.8304 26.199 -54.35 -15.12 15.8596 -0.08957 -0.18186 -7.58533 3.73183 0.00019 -0.00115 2000 246.8975222009 129.00000172.143471 97.202853 10.9218170.23637552 2.7294896 2.0843050 8.3 5.00.15 RATE 2.1856570 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.025 95 1.32 0.026 0 54776.5020090207_0429-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org