IOTA/IOTA-ES occultation update for (402) Chloe / TYC 0724-01025-1 event on 2009 Jan 08, 17:00 UT Visible from Summary ------- On 2009 Jan 08 UT, the 54 km diameter asteroid (402) Chloe will occult a 11.5 mag star in the constellation Orion for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 12.3 mag (the magnitude of the asteroid) for at most 5.3 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: 90 * date and approx. time of event: 2009 Jan 08, 16:50 - 2009 Jan 08, 17:09 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 5.3 * Moon: 91 % sunlit, 21° distance * Sun: 158° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 58 * 1 sigma uncertainty interval [path widths]: +/- 0.52 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .024", 86° ) * approx speed of asteroid's shadow [km/s]: 10.2612 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0724-01025-1 by 402 Chloe on 2009 Jan 8 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 - 13 0 0 48 48 5 17 9 53 6 77 0 49 4 19 48 31 53 49 21 14 48 15 4 - 12 0 0 48 58 33 17 9 52 6 78 -1 49 14 45 48 42 23 49 31 38 48 25 36 - 11 0 0 49 8 38 17 9 51 7 79 -1 49 24 47 48 52 30 49 41 38 48 35 45 - 10 0 0 49 18 19 17 9 50 8 79 -2 49 34 27 49 2 13 49 51 15 48 45 30 - 9 0 0 49 27 37 17 9 49 8 80 -3 49 43 43 49 11 33 50 0 30 48 54 52 - 8 0 0 49 36 32 17 9 48 9 81 -3 49 52 36 49 20 30 50 9 21 49 3 51 - 7 0 0 49 45 5 17 9 46 10 82 -4 50 1 7 49 29 4 50 17 50 49 12 27 - 6 0 0 49 53 15 17 9 45 10 82 -5 50 9 16 49 37 16 50 25 57 49 20 41 - 5 0 0 50 1 2 17 9 44 11 83 -5 50 17 2 49 45 5 50 33 41 49 28 31 - 4 0 0 50 8 28 17 9 42 12 84 -6 50 24 25 49 52 32 50 41 3 49 36 0 - 3 0 0 50 15 31 17 9 40 12 85 -6 50 31 27 49 59 37 50 48 3 49 43 6 - 2 0 0 50 22 12 17 9 39 13 86 -7 50 38 7 50 6 19 50 54 42 49 49 50 - 1 0 0 50 28 32 17 9 37 13 86 -8 50 44 25 50 12 40 51 0 59 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0 0 6 49 57 16 52 38 34 281 -53 7 7 22 6 32 35 7 25 30 6 14 33 145 0 0 6 21 24 16 52 31 33 281 -51 6 38 46 6 4 4 6 56 52 5 46 5 146 0 0 5 53 12 16 52 24 32 281 -50 6 10 31 5 35 55 6 28 34 5 17 59 147 0 0 5 25 22 16 52 18 31 282 -49 5 42 39 5 8 7 6 0 39 4 50 14 148 0 0 4 57 54 16 52 11 30 282 -48 5 15 8 4 40 42 5 33 6 4 22 51 149 0 0 4 30 50 16 52 5 29 282 -47 4 48 1 4 13 40 5 5 56 3 55 52 150 0 0 4 4 8 16 51 59 28 282 -46 4 21 17 3 47 2 4 39 10 3 29 16 151 0 0 3 37 52 16 51 54 27 282 -45 3 54 58 3 20 47 4 12 47 3 3 5 152 0 0 3 11 59 16 51 48 26 283 -44 3 29 3 2 54 58 3 46 50 2 37 18 153 0 0 2 46 32 16 51 43 25 283 -43 3 3 33 2 29 33 3 21 17 2 11 56 154 0 0 2 21 31 16 51 38 23 283 -42 2 38 29 2 4 34 2 56 10 1 47 0 155 0 0 1 56 55 16 51 33 22 283 -41 2 13 51 1 40 2 2 31 30 1 22 29 156 0 0 1 32 46 16 51 28 21 283 -40 1 49 39 1 15 55 2 7 15 0 58 26 157 0 0 1 9 4 16 51 24 20 283 -39 1 25 55 0 52 16 1 43 28 0 34 49 158 0 0 0 45 50 16 51 20 19 283 -38 1 2 38 0 29 4 1 20 8 0 11 39 159 0 0 0 23 3 16 51 16 18 283 -37 0 39 48 0 6 19 0 57 16 - 0 11 3 160 0 0 0 0 44 16 51 12 17 283 -36 0 17 27 - 0 15 57 0 34 52 - 0 33 16 161 0 0 - 0 21 7 16 51 9 16 283 -35 - 0 4 26 - 0 37 45 0 12 56 - 0 55 2 162 0 0 - 0 42 29 16 51 5 15 283 -34 - 0 25 51 - 0 59 5 - 0 8 30 - 1 16 19 163 0 0 - 1 3 21 16 51 2 14 283 -32 - 0 46 46 - 1 19 55 - 0 29 28 - 1 37 6 164 0 0 - 1 23 45 16 50 59 13 283 -31 - 1 7 11 - 1 40 16 - 0 49 56 - 1 57 25 165 0 0 - 1 43 38 16 50 57 12 283 -30 - 1 27 7 - 2 0 7 - 1 9 55 - 2 17 14 166 0 0 - 2 3 2 16 50 54 11 283 -29 - 1 46 33 - 2 19 29 - 1 29 23 - 2 36 33 167 0 0 - 2 21 56 16 50 52 10 283 -28 - 2 5 29 - 2 38 20 - 1 48 21 - 2 55 22 168 0 0 - 2 40 19 16 50 50 9 283 -27 - 2 23 55 - 2 56 41 - 2 6 49 - 3 13 41 169 0 0 - 2 58 11 16 50 48 8 283 -26 - 2 41 49 - 3 14 31 - 2 24 46 - 3 31 29 170 0 0 - 3 15 33 16 50 47 7 283 -25 - 2 59 13 - 3 31 51 - 2 42 12 - 3 48 46 171 0 0 - 3 32 23 16 50 45 6 283 -24 - 3 16 6 - 3 48 39 - 2 59 7 - 4 5 32 172 0 0 - 3 48 43 16 50 44 5 283 -23 - 3 32 27 - 4 4 57 - 3 15 30 - 4 21 48 173 0 0 - 4 4 31 16 50 43 4 283 -22 - 3 48 17 - 4 20 43 - 3 31 22 - 4 37 32 174 0 0 - 4 19 47 16 50 43 3 283 -21 - 4 3 35 - 4 35 57 - 3 46 42 - 4 52 44 175 0 0 - 4 34 31 16 50 42 2 283 -20 - 4 18 21 - 4 50 39 - 4 1 30 - 5 7 25 176 0 0 - 4 48 44 16 50 42 1 283 -19 - 4 32 36 - 5 4 50 - 4 15 47 - 5 21 33 Uncertainty in time = +/- 3 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 0724-01025-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 54 44.0545 DE: +12 40 33.701 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .020 ) * V mag [mag]: 11.5 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (402) Chloe approx. diameter [km]: 54 approx. diameter ["]: .052 distance from Earth [AU]: 1.42000 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 750 number of rejected observations: 83 time covered by the observations: 1903 Feb 22 - 2008 Oct 17 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.013, 82° remarks: * orbital elements for (402) Chloe : Mean anomaly = 318.45352352 deg Arg. of pericenter = 17.83855472 deg Long. of node = 129.52749789 deg Inclination = 11.82310911 deg Eccentricity = 0.11286031 Semimajor axis = 2.55873432 AU Perihelion dist = 2.26995476 AU Mag: H = 8.91, G = 0.15 Epoch of elements : MJD 54839.70900000 TDT (2009 Jan 08.709) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 8 402 Chloe 17h 0.3m UT 11.5 5 54 44.055 12 40 33.70TYC 0724-01025-1 11.8 12.3 54 5.3 1.420 -2.188 16.16 85.2248 12.672 -73.36 -22.15 17.0054 0.16673 0.33029 -5.17084 2.60887 0.00195 0.00102 2000 316.11554420081230.00000 17.838555129.527498 11.8231090.11286031 2.5587343 2.2699548 9.0 5.00.15 RATE 2.4080540 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.024 86 1.52 0.027 0 54774.5020090108_1025-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org