IOTA/IOTA-ES occultation update for (402) Chloe / TYC 0701-01965-1 event on 2012 Dec 02, 14:23 UT Visible from Japan, China Summary ------- On 2012 Dec 02 UT, the 61 km diameter asteroid (402) Chloe will occult a 11.1 mag star in the constellation Orion for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 12.4 mag (the magnitude of the asteroid) for at most 5.9 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 85 * date and approx. time of event: 2012 Dec 02, 14:14 - 2012 Dec 02, 14:33 UT * geocentric midpoint of event [JD]: 2456264.09995417 * magnitude of target star: 11.1 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 5.9 * Moon: 86 % sunlit, 33° distance * Sun: 161° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 0.61 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .035", 87° ) * approx speed of asteroid's shadow [km/s]: 10.2976 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0701-01965-1 by 402 Chloe on 2012 Dec 2 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 59 0 0 30 54 2 14 33 3 1 81 -19 31 12 57 30 35 11 31 36 5 30 12 16 60 0 0 31 2 15 14 33 3 2 82 -20 31 21 9 30 43 24 31 44 17 30 20 29 61 0 0 31 10 23 14 33 2 2 82 -21 31 29 17 30 51 33 31 52 25 30 28 38 62 0 0 31 18 28 14 33 2 3 83 -22 31 37 21 30 59 37 32 0 29 30 36 42 63 0 0 31 26 28 14 33 1 4 83 -23 31 45 21 31 7 37 32 8 29 30 44 43 64 0 0 31 34 23 14 33 0 5 84 -23 31 53 17 31 15 33 32 16 24 30 52 39 65 0 0 31 42 15 14 32 59 6 84 -24 32 1 8 31 23 25 32 24 15 31 0 30 66 0 0 31 50 1 14 32 58 7 85 -25 32 8 54 31 31 11 32 32 1 31 8 17 67 0 0 31 57 43 14 32 57 8 86 -26 32 16 35 31 38 53 32 39 42 31 15 59 68 0 0 32 5 19 14 32 55 8 86 -27 32 24 12 31 46 30 32 47 18 31 23 37 69 0 0 32 12 51 14 32 54 9 87 -28 32 31 44 31 54 2 32 54 50 31 31 9 70 0 0 32 20 18 14 32 52 10 87 -29 32 39 10 32 1 29 33 2 16 31 38 36 71 0 0 32 27 40 14 32 50 11 88 -29 32 46 31 32 8 51 33 9 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42 -119 0 0 26 3 48 14 14 57 9 274 -3 26 22 43 25 44 56 26 45 52 25 22 0 -118 0 0 25 55 7 14 14 56 8 275 -2 26 14 2 25 36 16 26 37 11 25 13 20 -117 0 0 25 46 29 14 14 54 7 275 -2 26 5 23 25 27 37 26 28 32 25 4 41 -116 0 0 25 37 52 14 14 53 6 276 -1 25 56 46 25 19 0 26 19 55 24 56 5 Uncertainty in time = +/- 4 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0701-01965-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 30 57.6884 DE: +07 48 01.472 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .034, .032 ) * V mag [mag]: 11.1 * B mag [mag]: 11.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (402) Chloe approx. diameter [km]: 61 approx. diameter ["]: .057 distance from Earth [AU]: 1.48200 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 994 number of rejected observations: 84 time covered by the observations: 1903 Feb 22 - 2012 Nov 08 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.012, 79° remarks: * orbital elements for (402) Chloe : Mean anomaly = 302.11140273 deg Arg. of pericenter = 17.14771095 deg Long. of node = 129.43760611 deg Inclination = 11.82132289 deg Eccentricity = 0.11153324 Semimajor axis = 2.56034425 AU Perihelion dist = 2.27478076 AU Mag: H = 8.93, G = 0.15 Epoch of elements : MJD 56263.60000000 TDT (2012 Dec 02.600) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 2 402 Chloe 14h 23.9m UT 11.1 5 30 57.688 7 48 1.47TYC 0701-01965-1 11.4 12.4 61 5.9 1.482 -2.319 1.87 154.9249 7.801 -38.57 -22.06 14.3989 0.02486 0.46598 -5.80383 0.31331 -0.00129 0.00144 2000 301.24532120121129.00000 17.147711129.437606 11.8213230.11153324 2.5603443 2.2747808 9.0 5.00.15 RATE 2.4057830 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.035 87 1.61 0.034 0 0 4 2 056247.0020121202_1965-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 09:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org