IOTA/IOTA-ES occultation update for (1125) China / TYC 5810-00243-1 event on 2012 Sep 21, 07:15 UT Visible from E Canada, USA, NW Mexico Summary ------- On 2012 Sep 21 UT, the 31 km diameter asteroid (1125) China will occult a 9.8 mag star in the constellation Aquarius for observers along a path across E Canada, USA, NW Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.7 mag to 16.5 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: 30 * date and approx. time of event: 2012 Sep 21, 07:08 - 2012 Sep 21, 07:22 UT * geocentric midpoint of event [JD]: 2456191.80247917 * magnitude of target star: 9.8 * magnitude drop [mag]: 6.7 * estimated maximum duration [s]: 2.6 * Moon: 33 % sunlit, 83° distance * Sun: 153° distance * rough path description: E Canada, USA, NW Mexico The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 2.26 * 1 sigma uncertainty interval [seconds]: +/- 7.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .038", 75° ) * approx speed of asteroid's shadow [km/s]: 11.8257 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5810-00243-1 by 1125 China on 2012 Sep 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 158 0 0 12 58 26 7 22 10 19 110 0 13 8 58 12 47 55 13 56 52 12 0 43 159 0 0 12 53 9 7 22 6 20 111 -1 13 3 40 12 42 39 13 51 31 11 55 30 160 0 0 12 48 22 7 22 2 21 111 -2 12 58 52 12 37 52 13 46 41 11 50 46 161 0 0 12 44 5 7 21 58 22 111 -3 12 54 35 12 33 36 13 42 21 11 46 31 162 0 0 12 40 18 7 21 54 23 112 -4 12 50 48 12 29 50 13 38 32 11 42 47 163 0 0 12 37 1 7 21 49 24 112 -5 12 47 31 12 26 34 13 35 13 11 39 33 164 0 0 12 34 15 7 21 44 25 112 -6 12 44 44 12 23 47 13 32 24 11 36 48 165 0 0 12 31 58 7 21 40 26 113 -7 12 42 27 12 21 31 13 30 6 11 34 33 166 0 0 12 30 12 7 21 35 27 113 -8 12 40 40 12 19 45 13 28 18 11 32 48 167 0 0 12 28 55 7 21 30 28 114 -9 12 39 23 12 18 28 13 27 0 11 31 33 168 0 0 12 28 8 7 21 24 28 114 -10 12 38 36 12 17 42 13 26 13 11 30 47 169 0 0 12 27 52 7 21 19 29 114 -11 12 38 19 12 17 25 13 25 55 11 30 31 170 0 0 12 28 5 7 21 13 30 115 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.. Uncertainty in time = +/- 8 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 5810-00243-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 18 57.1275 DE: -14 24 20.828 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .024 ) * V mag [mag]: 9.8 * B mag [mag]: 11.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1125) China approx. diameter [km]: 31 approx. diameter ["]: .017 distance from Earth [AU]: 2.53200 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1109 number of rejected observations: 36 time covered by the observations: 1909 Jan 27 - 2012 Aug 13 1 sigma uncertainty ellipse (major, minor, PA): 0.047, 0.030, 71° remarks: * orbital elements for (1125) China : Mean anomaly = 252.09668243 deg Arg. of pericenter = 11.18292605 deg Long. of node = 97.18753847 deg Inclination = 3.04204006 deg Eccentricity = 0.21804380 Semimajor axis = 3.12596150 AU Perihelion dist = 2.44436498 AU Mag: H = 11.62, G = 0.15 Epoch of elements : MJD 56191.30300000 TDT (2012 Sep 21.303) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 21 1125 China 7h 15.6m UT 9.8 22 18 57.128-14 24 20.83TYC 5810-00243-1 11.1 16.5 31 2.6 2.532 -1.504 -7.71 -134.7280 -14.403 69.36 0.51 7.2595 -0.19720 0.55923 -6.29411 -2.22181 0.00240 0.00128 2000 251.8643162012 920.00000 11.182926 97.187538 3.0420400.21804380 3.1259615 2.444365011.2 5.00.15 RATE 1.7833170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.038 75 3.26 0.038 0 0-5 2 056165.0020120921_0243-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 23:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org