IOTA/IOTA-ES occultation update for (9) Metis / UCAC2 40339525 event on 2012 Nov 09, 19:40 UT Visible from Russia, SW Asia, Arabia Summary ------- On 2012 Nov 09 UT, the 200 km diameter asteroid (9) Metis will occult a 11.4 mag star in the constellation Gemini for observers along a path across Russia, SW Asia, Arabia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.2 mag to 9.7 mag (the magnitude of the asteroid) for at most 40.2 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: 100 * date and approx. time of event: 2012 Nov 09, 19:22 - 2012 Nov 09, 19:50 UT * geocentric midpoint of event [JD]: 2456241.31751667 * magnitude of target star: 11.4 * magnitude drop [mag]: 0.2 * estimated maximum duration [s]: 40.2 * Moon: 22 % sunlit, 64° distance * Sun: 120° distance * rough path description: Russia, SW Asia, Arabia Additional comments ------------------- small mag drop The occultation path -------------------- * approximate projected width [km]: 281 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .024", 91° ) * approx speed of asteroid's shadow [km/s]: 4.9714 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 40339525 by 9 Metis on 2012 Nov 9 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 32 0 0 18 33 21 19 22 2 1 65 -58 17 7 1 20 2 14 16 44 58 20 25 47 33 0 0 19 2 16 19 22 3 2 65 -59 17 35 18 20 31 51 17 13 5 20 55 36 34 0 0 19 32 5 19 22 5 3 65 -60 18 4 27 21 2 24 17 42 4 21 26 21 35 0 0 20 2 50 19 22 7 4 66 -61 18 34 30 21 33 54 18 11 57 21 58 4 36 0 0 20 34 29 19 22 10 5 66 -62 19 5 27 22 6 20 18 42 43 22 30 43 37 0 0 21 7 4 19 22 13 6 66 -63 19 37 17 22 39 43 19 14 23 23 4 20 38 0 0 21 40 35 19 22 17 7 67 -64 20 10 2 23 14 4 19 46 56 23 38 54 39 0 0 22 15 1 19 22 22 9 67 -65 20 43 41 23 49 22 20 20 24 24 14 26 40 0 0 22 50 22 19 22 28 10 68 -65 21 18 14 24 25 37 20 54 45 24 50 56 41 0 0 23 26 40 19 22 34 11 68 -66 21 53 41 25 2 49 21 30 0 25 28 24 42 0 0 24 3 52 19 22 41 12 68 -67 22 30 3 25 40 59 22 6 8 26 6 49 43 0 0 24 42 0 19 22 49 13 69 -68 23 7 18 26 20 5 22 43 11 26 46 12 44 0 0 25 21 4 19 22 57 14 69 -69 23 45 27 27 0 9 23 21 6 27 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33 52 75 1 27 71 7 58 75 29 39 -131 0 0 72 59 41 19 50 48 18 293 0 71 16 53 74 46 29 70 50 45 75 14 59 Uncertainty in time = +/- 6 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: UCAC2 40339525 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 16 46.1736 DE: +24 20 29.865 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .022 ) * V mag [mag]: 11.4 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9) Metis approx. diameter [km]: 200 approx. diameter ["]: .195 distance from Earth [AU]: 1.41600 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1900 number of rejected observations: 188 time covered by the observations: 1903 Mar 22 - 2012 Oct 18 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.009, 93° remarks: * orbital elements for (9) Metis : Mean anomaly = 6.61327126 deg Arg. of pericenter = 5.92472044 deg Long. of node = 68.94637254 deg Inclination = 5.57546115 deg Eccentricity = 0.12295090 Semimajor axis = 2.38678060 AU Perihelion dist = 2.09332378 AU Mag: H = 6.23, G = 0.17 Epoch of elements : MJD 56240.82000000 TDT (2012 Nov 09.820) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 9 9 Metis 19h 37.2m UT 11.4 7 16 46.174 24 20 29.86UCAC2 40339525 0.0 9.7 200 40.2 1.416 1.156 7.31 125.5090 24.341 -118.33 -17.14 19.6204 -0.29500 0.63692 2.54764 1.17611 -0.00475 0.00053 2000 6.394092201211 9.00000 5.924720 68.946373 5.5754610.12295090 2.3867806 2.0933238 6.3 5.00.17 RATE 2.6729160 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.024 91 1.13 0.025 0 0-4 5 056226.0020121109_339525 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org