IOTA/IOTA-ES occultation update for (2765) Dinant / TYC 1195-02220-1 event on 2012 Dec 01, 19:16 UT Visible from Russia, Europe, N Africa Summary ------- On 2012 Dec 01 UT, the 21 km diameter asteroid (2765) Dinant will occult a 10.6 mag star in the constellation Pisces for observers along a path across Russia, Europe, N Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.3 mag to 16.9 mag (the magnitude of the asteroid) for at most 4.2 seconds. This update is based on 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: 23 * date and approx. time of event: 2012 Dec 01, 18:56 - 2012 Dec 01, 19:30 UT * geocentric midpoint of event [JD]: 2456263.30354583 * magnitude of target star: 10.6 * magnitude drop [mag]: 6.3 * estimated maximum duration [s]: 4.2 * Moon: 91 % sunlit, 83° distance * Sun: 132° distance * rough path description: Russia, Europe, N Africa The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 2.96 * 1 sigma uncertainty interval [seconds]: +/- 14.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .035", 61° ) * approx speed of asteroid's shadow [km/s]: 4.8998 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1195-02220-1 by 2765 Dinant on 2012 Dec 1 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 - 27 0 0 5 29 47 19 30 9 48 63 0 5 37 56 5 21 38 6 26 22 4 33 32 - 26 0 0 6 27 46 19 29 45 50 63 -2 6 35 58 6 19 35 7 24 36 5 31 18 - 25 0 0 7 26 7 19 29 21 51 64 -3 7 34 20 7 17 54 8 23 10 6 29 24 - 24 0 0 8 24 46 19 28 57 52 65 -4 8 33 1 8 16 31 9 22 2 7 27 50 - 23 0 0 9 23 41 19 28 32 53 65 -5 9 31 58 9 15 24 10 21 10 8 26 33 - 22 0 0 10 22 49 19 28 7 55 66 -6 10 31 8 10 14 31 11 20 32 9 25 30 - 21 0 0 11 22 9 19 27 41 56 67 -7 11 30 30 11 13 49 12 20 4 10 24 38 - 20 0 0 12 21 38 19 27 15 57 68 -9 12 30 0 12 13 16 13 19 44 11 23 56 - 19 0 0 13 21 13 19 26 49 58 70 -10 13 29 37 13 12 50 14 19 29 12 23 21 - 18 0 0 14 20 51 19 26 22 59 71 -11 14 29 16 14 12 27 15 19 18 13 22 49 - 17 0 0 15 20 31 19 25 55 60 72 -12 15 28 57 15 12 5 16 19 6 14 22 19 - 16 0 0 16 20 8 19 25 28 61 74 -13 16 28 36 16 11 41 17 18 53 15 21 49 - 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Uncertainty in time = +/- 15 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1195-02220-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 03 36.5407 DE: +21 56 01.817 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .018 ) * V mag [mag]: 10.6 * B mag [mag]: 11.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2765) Dinant approx. diameter [km]: 21 approx. diameter ["]: .012 distance from Earth [AU]: 2.36900 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: TMO MPC (via Astdys) number of used observations: 846 number of rejected observations: 8 time covered by the observations: 1977 Aug 10 - 2012 Oct 14 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.031, 52° remarks: * orbital elements for (2765) Dinant : Mean anomaly = 283.56759376 deg Arg. of pericenter = 132.21960437 deg Long. of node = 348.27301848 deg Inclination = 14.03316689 deg Eccentricity = 0.05734500 Semimajor axis = 3.14681745 AU Perihelion dist = 2.96636320 AU Mag: H = 12.08, G = 0.15 Epoch of elements : MJD 56262.80300000 TDT (2012 Dec 01.803) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 1 2765 Dinant 19h 17.1m UT 10.6 1 3 36.541 21 56 1.82TYC 1195-02220-1 11.6 16.9 21 4.2 2.369 -0.540 -6.96 15.5784 21.936 -111.94 -21.95 19.2851 -0.19195 0.20834 -2.03063 -1.87746 0.00438 0.00080 2000 283.07269120121129.00000132.219604348.273018 14.0331670.05734500 3.1468175 2.966363211.8 5.00.15 RATE 1.7656180 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.035 61 3.96 0.036 0 0-3-3 056247.0020121201_2220-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org