IOTA/IOTA-ES occultation update for (2934) Aristophanes / TYC 0740-00277-1 event on 2012 Dec 08, 20:24 UT Visible from Philippines, Africa Summary ------- On 2012 Dec 08 UT, the 24 km diameter asteroid (2934) Aristophanes will occult a 10.0 mag star in the constellation Monoceros for observers along a path across Philippines, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.6 mag (the magnitude of the asteroid) for at most 1.9 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: 17 * date and approx. time of event: 2012 Dec 08, 20:17 - 2012 Dec 08, 20:32 UT * geocentric midpoint of event [JD]: 2456270.3505875 * magnitude of target star: 10.0 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 1.9 * Moon: 27 % sunlit, 97° distance * Sun: 157° distance * rough path description: Philippines, Africa The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 3.94 * 1 sigma uncertainty interval [seconds]: +/- 8.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .055) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .055", 93° ) * approx speed of asteroid's shadow [km/s]: 12.8937 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0740-00277-1 by 2934 Aristophanes on 2012 Dec 8 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 - 13 0 0 -24 19 57 20 32 45 1 77 -13 -24 12 59 -24 26 56 .. .. .. -25 22 3 - 12 0 0 -24 7 6 20 32 45 2 76 -14 -24 0 8 -24 14 5 .. .. .. -25 9 14 - 11 0 0 -23 54 6 20 32 45 2 76 -15 -23 47 7 -24 1 5 .. .. .. -24 56 15 - 10 0 0 -23 40 57 20 32 44 3 76 -16 -23 33 58 -23 47 57 .. .. .. -24 43 9 - 9 0 0 -23 27 40 20 32 44 4 75 -16 -23 20 41 -23 34 39 -22 25 47 -24 29 53 - 8 0 0 -23 14 15 20 32 43 5 75 -17 -23 7 15 -23 21 14 -22 12 20 -24 16 30 - 7 0 0 -23 0 41 20 32 42 6 74 -18 -22 53 42 -23 7 41 -21 58 45 -24 2 58 - 6 0 0 -22 47 0 20 32 41 7 74 -19 -22 40 0 -22 54 0 -21 45 2 -23 49 19 - 5 0 0 -22 33 11 20 32 40 8 74 -20 -22 26 11 -22 40 12 -21 31 11 -23 35 32 - 4 0 0 -22 19 15 20 32 39 9 73 -21 -22 12 15 -22 26 16 -21 17 14 -23 21 38 - 3 0 0 -22 5 13 20 32 37 10 73 -22 -21 58 12 -22 12 13 -21 3 9 -23 7 36 - 2 0 0 -21 51 3 20 32 36 11 72 -23 -21 44 2 -21 58 4 -20 48 58 -22 53 28 - 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4 6 51 137 0 0 - 3 12 44 20 17 49 26 285 -5 - 3 5 54 - 3 19 34 - 2 12 12 - 4 13 35 138 0 0 - 3 19 42 20 17 46 25 285 -4 - 3 12 52 - 3 26 32 - 2 19 8 - 4 20 35 139 0 0 - 3 26 54 20 17 42 24 285 -3 - 3 20 4 - 3 33 44 - 2 26 18 - 4 27 49 140 0 0 - 3 34 21 20 17 38 23 285 -2 - 3 27 30 - 3 41 12 - 2 33 43 - 4 35 18 141 0 0 - 3 42 2 20 17 35 22 284 -1 - 3 35 12 - 3 48 53 - 2 41 23 - 4 43 1 142 0 0 - 3 49 58 20 17 31 21 284 0 - 3 43 7 - 3 56 50 - 2 49 17 - 4 50 59 Uncertainty in time = +/- 9 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0740-00277-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 27 51.1730 DE: +11 50 10.395 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .030 ) * V mag [mag]: 10.0 * B mag [mag]: 10.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2934) Aristophanes approx. diameter [km]: 24 approx. diameter ["]: .014 distance from Earth [AU]: 2.38700 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1092 number of rejected observations: 13 time covered by the observations: 1960 Sep 24 - 2012 Feb 11 1 sigma uncertainty ellipse (major, minor, PA): 0.060, 0.046, 94° remarks: * orbital elements for (2934) Aristophanes : Mean anomaly = 157.43787414 deg Arg. of pericenter = 89.51586256 deg Long. of node = 202.34302699 deg Inclination = 8.79524678 deg Eccentricity = 0.04816806 Semimajor axis = 3.17457986 AU Perihelion dist = 3.02166650 AU Mag: H = 11.53, G = 0.15 Epoch of elements : MJD 56269.85100000 TDT (2012 Dec 08.851) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 8 2934 Aristophanes 20h 24.8m UT 10.0 6 27 51.173 11 50 10.39TYC 0740-00277-1 10.3 16.6 24 1.9 2.387 -1.806 -4.01 72.7584 11.837 -128.15 -22.82 20.4141 0.04176 -0.27703 -7.19570 -1.08841 -0.00204 0.00123 2000 155.72133020121129.00000 89.515863202.343027 8.7952470.04816806 3.1745799 3.021666511.6 5.00.15 RATE 1.7425070 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.055 93 4.94 0.055 0 0 0 5 056264.0020121208_0277-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 04:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org