IOTA/IOTA-ES occultation update for (9) Metis / UCAC2 41354542 event on 2012 Dec 19, 20:39 UT Visible from Japan, China, Russia, Scandanavia Summary ------- On 2012 Dec 19 UT, the 200 km diameter asteroid (9) Metis will occult a 11.5 mag star in the constellation Gemini for observers along a path across Japan, China, Russia, Scandanavia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.1 mag to 8.7 mag (the magnitude of the asteroid) for at most 24.5 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: 99 * date and approx. time of event: 2012 Dec 19, 20:32 - 2012 Dec 19, 20:52 UT * geocentric midpoint of event [JD]: 2456281.36259583 * magnitude of target star: 11.5 * magnitude drop [mag]: 0.1 * estimated maximum duration [s]: 24.5 * Moon: 46 % sunlit, 110° distance * Sun: 163° distance * rough path description: Japan, China, Russia, Scandanavia Additional comments ------------------- extremely small mag drop The occultation path -------------------- * approximate projected width [km]: 239 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .027", 0° ) * approx speed of asteroid's shadow [km/s]: 8.1536 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 41354542 by 9 Metis on 2012 Dec 19 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 - 60 0 0 47 43 24 20 52 59 0 47 -7 49 11 48 .. .. .. 49 45 57 .. .. .. - 59 0 0 48 20 54 20 52 59 1 48 -8 49 49 4 46 54 41 50 23 7 .. .. .. - 58 0 0 48 57 42 20 52 59 2 49 -9 50 25 38 47 31 44 50 59 36 46 59 32 - 57 0 0 49 33 50 20 52 58 3 49 -10 51 1 30 48 8 7 51 35 21 47 36 0 - 56 0 0 50 9 17 20 52 57 4 50 -10 51 36 39 48 43 49 52 10 24 48 11 48 - 55 0 0 50 44 1 20 52 56 4 51 -11 52 11 6 49 18 51 52 44 44 48 46 56 - 54 0 0 51 18 4 20 52 55 5 52 -12 52 44 51 49 53 11 53 18 21 49 21 23 - 53 0 0 51 51 25 20 52 54 6 52 -13 53 17 52 50 26 51 53 51 15 49 55 9 - 52 0 0 52 24 4 20 52 52 7 53 -14 53 50 10 50 59 49 54 23 25 50 28 15 - 51 0 0 52 56 1 20 52 51 8 54 -14 54 21 46 51 32 5 54 54 53 51 0 39 - 50 0 0 53 27 16 20 52 49 9 55 -15 54 52 40 52 3 41 55 25 37 51 32 22 - 49 0 0 53 57 49 20 52 47 9 56 -16 55 22 50 52 34 35 55 55 39 52 3 24 - 48 0 0 54 27 41 20 52 45 10 56 -16 55 52 19 53 4 49 56 24 59 52 33 46 - 47 0 0 54 56 51 20 52 42 11 57 -17 56 21 6 53 34 22 56 53 36 53 3 26 - 46 0 0 55 25 21 20 52 40 12 58 -18 56 49 11 54 3 14 57 21 32 53 32 27 - 45 0 0 55 53 9 20 52 37 12 59 -18 57 16 36 54 31 26 57 48 47 54 0 47 - 44 0 0 56 20 18 20 52 35 13 60 -19 57 43 19 54 58 58 58 15 21 54 28 28 - 43 0 0 56 46 47 20 52 32 14 61 -20 58 9 23 55 25 50 58 41 15 54 55 29 - 42 0 0 57 12 36 20 52 29 14 61 -20 58 34 47 55 52 4 59 6 29 55 21 51 - 41 0 0 57 37 47 20 52 27 15 62 -21 58 59 32 56 17 38 59 31 3 55 47 35 - 40 0 0 58 2 19 20 52 24 16 63 -22 59 23 38 56 42 35 59 55 0 56 12 40 - 39 0 0 58 26 13 20 52 21 16 64 -22 59 47 7 57 6 54 60 18 18 56 37 8 - 38 0 0 58 49 30 20 52 18 17 65 -23 60 9 58 57 30 36 60 40 58 57 0 59 - 37 0 0 59 12 11 20 52 14 18 66 -23 60 32 12 57 53 41 61 3 2 57 24 13 - 36 0 0 59 34 15 20 52 11 18 67 -24 60 53 50 58 16 10 61 24 30 57 46 51 - 35 0 0 59 55 44 20 52 8 19 68 -24 61 14 53 58 38 3 61 45 22 58 8 54 - 34 0 0 60 16 37 20 52 5 19 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37 26 21 25 137 0 0 27 30 41 20 33 32 31 287 -14 28 54 13 26 8 50 29 26 26 25 38 8 138 0 0 26 47 6 20 33 23 30 288 -13 28 10 17 25 25 34 28 42 21 24 54 59 139 0 0 26 3 39 20 33 14 29 289 -12 27 26 29 24 42 27 27 58 25 24 11 59 140 0 0 25 20 23 20 33 5 28 289 -11 26 42 52 23 59 31 27 14 39 23 29 10 141 0 0 24 37 19 20 32 56 27 290 -10 25 59 26 23 16 47 26 31 5 22 46 34 142 0 0 23 54 29 20 32 48 25 290 -9 25 16 14 22 34 18 25 47 43 22 4 12 143 0 0 23 11 54 20 32 40 24 291 -7 24 33 16 21 52 4 25 4 37 21 22 6 144 0 0 22 29 37 20 32 33 23 291 -6 23 50 35 21 10 8 24 21 47 20 40 18 145 0 0 21 47 37 20 32 26 22 292 -5 23 8 13 20 28 30 23 39 16 19 58 47 146 0 0 21 5 57 20 32 19 21 292 -4 22 26 10 19 47 12 22 57 3 19 17 37 147 0 0 20 24 39 20 32 12 20 293 -3 21 44 28 19 6 15 22 15 12 18 36 49 148 0 0 19 43 43 20 32 6 19 293 -2 21 3 9 18 25 41 21 33 44 17 56 23 149 0 0 19 3 11 20 32 0 18 294 -1 20 22 13 17 45 32 20 52 39 17 16 22 Uncertainty in time = +/- 5 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: UCAC2 41354542 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 05 21.7534 DE: +27 26 40.399 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .045 ) * V mag [mag]: 11.5 * 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 ["]: .240 distance from Earth [AU]: 1.15000 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1905 number of rejected observations: 188 time covered by the observations: 1903 Mar 22 - 2012 Nov 28 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.011, 92° remarks: * orbital elements for (9) Metis : Mean anomaly = 17.34198811 deg Arg. of pericenter = 5.89520881 deg Long. of node = 68.94605739 deg Inclination = 5.57538283 deg Eccentricity = 0.12287364 Semimajor axis = 2.38653969 AU Perihelion dist = 2.09329688 AU Mag: H = 6.23, G = 0.17 Epoch of elements : MJD 56280.86100000 TDT (2012 Dec 19.861) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 19 9 Metis 20h 42.1m UT 11.5 7 5 21.753 27 26 40.40UCAC2 41354542 0.0 8.7 200 24.5 1.150 -2.440 13.60 66.9580 27.442 -131.16 -23.43 20.7023 0.21203 0.50747 -4.24455 1.77851 -0.00158 -0.00028 2000 17.11181520121219.00000 5.895209 68.946057 5.5753830.12287364 2.3865397 2.0932969 6.3 5.00.17 RATE 2.6733210 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.027 0 1.19 0.045 0 0 4-1 056264.0020121219_354542 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org