IOTA/IOTA-ES occultation update for (2140) Kemerovo / HIP 6187 event on 2012 Nov 13, 10:54 UT Visible from E Russia, China Summary ------- On 2012 Nov 13 UT, the 32 km diameter asteroid (2140) Kemerovo will occult a 7.6 mag star in the constellation Pisces for observers along a path across E Russia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.6 mag to 15.2 mag (the magnitude of the asteroid) for at most 3.4 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: . The event at a glimpse ---------------------- * Rank: 35 * date and approx. time of event: 2012 Nov 13, 10:46 - 2012 Nov 13, 11:02 UT * geocentric midpoint of event [JD]: 2456244.95500417 * magnitude of target star: 7.6 * magnitude drop [mag]: 7.6 * estimated maximum duration [s]: 3.4 * Moon: 0 % sunlit, 158° distance * Sun: 152° distance * rough path description: E Russia, China The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 1.92 * 1 sigma uncertainty interval [seconds]: +/- 8.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .042", 70° ) * approx speed of asteroid's shadow [km/s]: 9.3098 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 6187 by 2140 Kemerovo on 2012 Nov 13 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude 97 0 0 12 17 1 11 2 29 28 76 -1 12 30 46 12 3 20 13 24 2 11 11 15 98 0 0 13 3 4 11 2 20 29 76 -2 13 16 56 12 49 15 14 10 44 11 56 40 99 0 0 13 50 7 11 2 11 30 77 -3 14 4 7 13 36 9 14 58 27 12 43 5 100 0 0 14 38 8 11 2 2 31 77 -4 14 52 17 14 24 3 15 47 10 13 30 28 101 0 0 15 27 9 11 1 52 32 78 -5 15 41 26 15 12 55 16 36 53 14 18 48 102 0 0 16 17 7 11 1 42 33 79 -6 16 31 33 16 2 45 17 27 35 15 8 6 103 0 0 17 8 3 11 1 31 34 79 -7 17 22 38 16 53 31 18 19 15 15 58 19 104 0 0 17 59 55 11 1 21 35 80 -8 18 14 39 17 45 14 19 11 53 16 49 28 105 0 0 18 52 42 11 1 9 36 81 -10 19 7 36 18 37 52 20 5 27 17 41 31 106 0 0 19 46 23 11 0 58 37 82 -11 20 1 27 19 31 24 20 59 57 18 34 28 107 0 0 20 40 58 11 0 46 38 83 -12 20 56 12 20 25 49 21 55 21 19 28 17 108 0 0 21 36 24 11 0 34 39 84 -13 21 51 48 21 21 5 22 51 39 20 22 56 109 0 0 22 32 41 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Uncertainty in time = +/- 9 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: HIP 6187 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 19 24.0698 DE: +18 08 15.205 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .015, .011 ) * V mag [mag]: 7.6 * B mag [mag]: 8.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2140) Kemerovo approx. diameter [km]: 32 approx. diameter ["]: .023 distance from Earth [AU]: 1.90600 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 956 number of rejected observations: 19 time covered by the observations: 1951 Dec 27 - 2012 Oct 06 1 sigma uncertainty ellipse (major, minor, PA): 0.056, 0.041, 69° remarks: * orbital elements for (2140) Kemerovo : Mean anomaly = 357.22569206 deg Arg. of pericenter = 122.21806888 deg Long. of node = 274.80779997 deg Inclination = 6.98658914 deg Eccentricity = 0.05577757 Semimajor axis = 2.98782252 AU Perihelion dist = 2.82116904 AU Mag: H = 11.32, G = 0.15 Epoch of elements : MJD 56244.45500000 TDT (2012 Nov 13.455) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 13 2140 Kemerovo 10h 55.2m UT 7.6 1 19 24.070 18 8 15.21HIP 6187 8.7 15.2 32 3.4 1.906 -1.309 -15.45 163.0870 18.142 12.29 -18.13 10.9201 -0.39040 0.47548 -4.04877 -3.34957 0.00273 0.00021 2000 356.375495201211 9.00000122.218069274.807800 6.9865890.05577757 2.9878225 2.821169010.9 5.00.15 RATE 1.9084110 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.042 70 2.92 0.045 0 0-2-5 056226.0020121113___6187 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org