IOTA/IOTA-ES occultation update for (2761) Eddington / 2UCAC 41510894 event on 2012 Dec 20, 14:47 UT Visible from Japan, China, India Summary ------- On 2012 Dec 20 UT, the 19 km diameter asteroid (2761) Eddington will occult a 11.9 mag star in the constellation Gemini for observers along a path across Japan, China, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 15.5 mag (the magnitude of the asteroid) for at most 1.8 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 16 * date and approx. time of event: 2012 Dec 20, 14:37 - 2012 Dec 20, 14:57 UT * geocentric midpoint of event [JD]: 2456282.11645833 * magnitude of target star: 11.9 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 1.8 * Moon: 54 % sunlit, 87° distance * Sun: 175° distance * rough path description: Japan, China, India The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 4.08 * 1 sigma uncertainty interval [seconds]: +/- 10.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .101 +/- .065) * 1 sigma uncertainty ellipse (major, minor, PA): ( .101", .065", 88° ) * approx speed of asteroid's shadow [km/s]: 10.6238 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 41510894 by 2761 Eddington on 2012 Dec 20 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 45 0 0 5 41 34 14 57 42 1 62 -2 5 47 24 5 35 44 6 34 59 4 48 10 46 0 0 6 13 16 14 57 42 2 62 -3 6 19 5 6 7 26 7 6 38 5 19 54 47 0 0 6 44 48 14 57 41 3 62 -4 6 50 37 6 38 58 7 38 7 5 51 29 48 0 0 7 16 10 14 57 40 4 62 -6 7 21 59 7 10 21 8 9 26 6 22 54 49 0 0 7 47 21 14 57 39 5 63 -7 7 53 10 7 41 33 8 40 34 6 54 9 50 0 0 8 18 21 14 57 38 6 63 -8 8 24 9 8 12 33 9 11 30 7 25 12 51 0 0 8 49 8 14 57 37 7 63 -9 8 54 56 8 43 21 9 42 14 7 56 3 52 0 0 9 19 43 14 57 35 9 63 -10 9 25 30 9 13 55 10 12 44 8 26 41 53 0 0 9 50 3 14 57 33 10 63 -11 9 55 50 9 44 16 10 43 1 8 57 6 54 0 0 10 20 9 14 57 31 11 63 -12 10 25 55 10 14 23 11 13 2 9 27 16 55 0 0 10 50 0 14 57 29 12 64 -13 10 55 46 10 44 14 11 42 48 9 57 12 56 0 0 11 19 35 14 57 27 13 64 -14 11 25 20 11 13 49 12 12 18 10 26 51 57 0 0 11 48 53 14 57 24 14 64 -15 11 54 38 11 43 8 12 41 32 10 56 15 58 0 0 12 17 54 14 57 21 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2 298 -1 - 0 27 37 - 0 39 17 0 19 59 - 1 26 52 Uncertainty in time = +/- 11 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: 2UCAC 41510894 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 03 38.4640 DE: +27 46 55.324 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .021, .027 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2761) Eddington approx. diameter [km]: 19 approx. diameter ["]: .016 distance from Earth [AU]: 1.63600 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: MPC (via Astdys) number of used observations: 1072 number of rejected observations: 21 time covered by the observations: 1979 Oct 14 - 2012 Jan 19 1 sigma uncertainty ellipse (major, minor, PA): 0.099, 0.059, 88° remarks: * orbital elements for (2761) Eddington : Mean anomaly = 331.70889756 deg Arg. of pericenter = 99.35978085 deg Long. of node = 31.34017132 deg Inclination = 3.17262876 deg Eccentricity = 0.18228461 Semimajor axis = 3.08307046 AU Perihelion dist = 2.52107415 AU Mag: H = 12.10, G = 0.15 Epoch of elements : MJD 56281.61600000 TDT (2012 Dec 20.616) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 20 2761 Eddington 14h 47.7m UT 11.9 6 3 38.464 27 46 55.322UCAC 41510894 0.0 15.5 19 1.8 1.636 -2.423 2.22 139.3945 27.781 -42.45 -23.43 14.7950 0.00228 0.03516 -5.98204 0.41445 -0.00016 -0.00045 2000 331.41467920121219.00000 99.359781 31.340171 3.1726290.18228461 3.0830705 2.521074212.1 5.00.15 RATE 1.8206610 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.101 0.065 88 5.08 0.065 0 0 0 4 056278.0020121220_510894 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 10:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org