IOTA/IOTA-ES occultation update for (3560) Chenqian / TYC 2324-00744-1 event on 2012 Nov 21, 17:37 UT Visible from Japan, China, India, Africa Summary ------- On 2012 Nov 21 UT, the 27 km diameter asteroid (3560) Chenqian will occult a 11.5 mag star in the constellation Aries for observers along a path across Japan, China, India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.4 mag (the magnitude of the asteroid) for at most 2.6 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: 28 * date and approx. time of event: 2012 Nov 21, 17:27 - 2012 Nov 21, 17:47 UT * geocentric midpoint of event [JD]: 2456253.23435833 * magnitude of target star: 11.5 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 2.6 * Moon: 62 % sunlit, 62° distance * Sun: 160° distance * rough path description: Japan, China, India, Africa The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 2.42 * 1 sigma uncertainty interval [seconds]: +/- 6.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .059 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .051", 72° ) * approx speed of asteroid's shadow [km/s]: 10.2267 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2324-00744-1 by 3560 Chenqian on 2012 Nov 21 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 9 0 0 -24 2 27 17 47 36 9 51 0 -23 53 3 -24 11 51 -23 7 38 -24 57 28 10 0 0 -23 19 36 17 47 33 11 50 -1 -23 10 11 -23 29 2 -22 24 39 -24 14 46 11 0 0 -22 36 16 17 47 31 12 50 -2 -22 26 49 -22 45 43 -21 41 11 -23 31 33 12 0 0 -21 52 26 17 47 28 13 49 -3 -21 42 58 -22 1 55 -20 57 14 -22 47 51 13 0 0 -21 8 9 17 47 25 14 49 -5 -20 58 40 -21 17 39 -20 12 51 -22 3 41 14 0 0 -20 23 26 17 47 22 15 49 -6 -20 13 56 -20 32 57 -19 28 2 -21 19 4 15 0 0 -19 38 19 17 47 18 17 48 -7 -19 28 48 -19 47 50 -18 42 49 -20 34 1 16 0 0 -18 52 48 17 47 15 18 48 -8 -18 43 16 -19 2 20 -17 57 13 -19 48 35 17 0 0 -18 6 56 17 47 10 19 48 -9 -17 57 23 -18 16 29 -17 11 17 -19 2 48 18 0 0 -17 20 44 17 47 6 20 47 -10 -17 11 11 -17 30 18 -16 25 2 -18 16 39 19 0 0 -16 34 14 17 47 1 21 47 -11 -16 24 41 -16 43 48 -15 38 29 -17 30 12 20 0 0 -15 47 28 17 46 56 23 47 -13 -15 37 54 -15 57 2 -14 51 41 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55 44 49 0 0 6 30 41 17 42 48 58 39 -47 6 39 43 6 21 38 7 23 24 5 37 47 50 0 0 7 12 0 17 42 37 59 39 -48 7 21 0 7 2 59 8 4 32 6 19 18 51 0 0 7 52 47 17 42 26 60 39 -49 8 1 45 7 43 48 8 45 6 7 0 17 52 0 0 8 33 1 17 42 15 61 38 -51 8 41 57 8 24 4 9 25 8 7 40 43 53 0 0 9 12 41 17 42 4 62 38 -52 9 21 35 9 3 47 10 4 36 8 20 36 54 0 0 9 51 47 17 41 53 63 37 -53 10 0 39 9 42 54 10 43 29 8 59 55 55 0 0 10 30 17 17 41 41 64 37 -54 10 39 7 10 21 27 11 21 47 9 38 38 56 0 0 11 8 12 17 41 30 65 36 -55 11 17 0 10 59 25 11 59 30 10 16 46 57 0 0 11 45 31 17 41 19 66 35 -56 11 54 17 11 36 46 12 36 36 10 54 17 58 0 0 12 22 14 17 41 8 67 35 -57 12 30 57 12 13 30 13 13 6 11 31 13 59 0 0 12 58 19 17 40 56 68 34 -58 13 7 0 12 49 38 13 48 59 12 7 31 60 0 0 13 33 47 17 40 45 69 33 -59 13 42 26 13 25 8 14 24 14 12 43 12 61 0 0 14 8 37 17 40 34 70 32 -60 14 17 14 14 0 0 14 58 52 13 18 15 62 0 0 14 42 50 17 40 22 71 30 -61 14 51 24 14 34 15 15 32 51 13 52 40 63 0 0 15 16 24 17 40 11 72 29 -62 15 24 56 15 7 51 16 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23 59 149 0 0 25 52 8 17 28 19 26 293 -40 25 59 56 25 44 21 26 37 36 25 6 34 150 0 0 25 34 14 17 28 15 25 293 -39 25 42 3 25 26 25 26 19 51 24 48 30 151 0 0 25 15 41 17 28 10 25 294 -38 25 23 31 25 7 50 26 1 27 24 29 47 152 0 0 24 56 28 17 28 6 24 294 -37 25 4 20 24 48 35 25 42 24 24 10 24 153 0 0 24 36 35 17 28 2 23 294 -36 24 44 29 24 28 41 25 22 42 23 50 21 154 0 0 24 16 3 17 27 58 22 295 -35 24 23 59 24 8 6 25 2 20 23 29 38 155 0 0 23 54 50 17 27 54 21 295 -34 24 2 48 23 46 52 24 41 18 23 8 14 156 0 0 23 32 56 17 27 51 20 295 -33 23 40 56 23 24 56 24 19 35 22 46 10 157 0 0 23 10 21 17 27 47 19 296 -32 23 18 23 23 2 19 23 57 12 22 23 23 158 0 0 22 47 5 17 27 44 18 296 -31 22 55 9 22 39 1 23 34 7 21 59 56 159 0 0 22 23 8 17 27 40 17 297 -30 22 31 13 22 15 2 23 10 22 21 35 46 160 0 0 21 58 28 17 27 37 16 297 -29 22 6 36 21 50 20 22 45 54 21 10 54 161 0 0 21 33 6 17 27 34 15 297 -28 21 41 16 21 24 55 22 20 44 20 45 19 162 0 0 21 7 1 17 27 31 14 298 -27 21 15 13 20 58 49 21 54 52 20 19 2 163 0 0 20 40 13 17 27 29 13 298 -26 20 48 28 20 31 59 21 28 18 19 52 1 164 0 0 20 12 43 17 27 26 12 298 -25 20 20 59 20 4 26 21 1 0 19 24 17 165 0 0 19 44 29 17 27 24 11 299 -24 19 52 48 19 36 9 20 32 59 18 55 49 166 0 0 19 15 31 17 27 22 10 299 -23 19 23 52 19 7 9 20 4 15 18 26 37 167 0 0 18 45 49 17 27 20 9 299 -22 18 54 13 18 37 25 19 34 48 17 56 42 168 0 0 18 15 23 17 27 19 7 300 -21 18 23 50 18 6 57 19 4 36 17 26 2 169 0 0 17 44 13 17 27 17 6 300 -20 17 52 42 17 35 44 18 33 40 16 54 37 170 0 0 17 12 19 17 27 16 5 300 -19 17 20 50 17 3 48 18 2 1 16 22 29 171 0 0 16 39 40 17 27 15 4 300 -18 16 48 14 16 31 6 17 29 36 15 49 35 172 0 0 16 6 17 17 27 14 3 301 -17 16 14 53 15 57 41 16 56 28 15 15 57 173 0 0 15 32 10 17 27 14 2 301 -16 15 40 48 15 23 30 16 22 35 14 41 34 174 0 0 14 57 17 17 27 13 1 301 -15 15 5 59 14 48 36 15 47 58 14 6 27 Uncertainty in time = +/- 7 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 2324-00744-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 35 23.3449 DE: +30 21 24.152 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .023, .033 ) * V mag [mag]: 11.5 * B mag [mag]: 12.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3560) Chenqian approx. diameter [km]: 27 approx. diameter ["]: .021 distance from Earth [AU]: 1.74300 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 937 number of rejected observations: 23 time covered by the observations: 1970 Oct 09 - 2012 Nov 01 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.039, 69° remarks: * orbital elements for (3560) Chenqian : Mean anomaly = 20.04716479 deg Arg. of pericenter = 60.46064978 deg Long. of node = 325.31602870 deg Inclination = 9.27329811 deg Eccentricity = 0.11682902 Semimajor axis = 3.01932285 AU Perihelion dist = 2.66657833 AU Mag: H = 10.91, G = 0.15 Epoch of elements : MJD 56252.73400000 TDT (2012 Nov 21.734) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 21 3560 Chenqian 17h 37.5m UT 11.5 2 35 23.345 30 21 24.15TYC 2324-00744-1 12.6 14.4 27 2.6 1.743 -2.024 -12.70 73.3558 30.360 -87.85 -20.11 17.6246 0.06914 -0.14190 -5.19517 -2.51568 0.00179 -0.00089 2000 19.53354920121119.00000 60.460650325.316029 9.2732980.11682902 3.0193229 2.666578310.5 5.00.15 RATE 1.8786240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.051 72 3.42 0.052 0 0-1 2 056247.0020121121_0744-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org