IOTA/IOTA-ES occultation update for (3015) Candy / HIP 25816 event on 2012 Dec 23, 21:10 UT Visible from Arabia, Africa Summary ------- On 2012 Dec 23 UT, the 20 km diameter asteroid (3015) Candy will occult a 6.0 mag star in the constellation Auriga for observers along a path across Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 10.3 mag to 16.3 mag (the magnitude of the asteroid) for at most 1.5 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: . The event at a glimpse ---------------------- * Rank: 15 * date and approx. time of event: 2012 Dec 23, 21:02 - 2012 Dec 23, 21:16 UT * geocentric midpoint of event [JD]: 2456285.38172917 * magnitude of target star: 6.0 * magnitude drop [mag]: 10.3 * estimated maximum duration [s]: 1.5 * Moon: 83 % sunlit, 43° distance * Sun: 160° distance * rough path description: Arabia, Africa Additional comments ------------------- possible double star The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 4.41 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .053) * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .052", 75° ) * approx speed of asteroid's shadow [km/s]: 14.7711 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 25816 by 3015 Candy on 2012 Dec 23 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 - 8 15 15 21 16 28 5 47 -1 - 8 6 47 - 8 23 43 - 6 52 45 - 9 38 42 - 44 0 0 - 7 22 51 21 16 27 6 47 -2 - 7 14 26 - 7 31 17 - 6 0 48 - 8 45 52 - 43 0 0 - 6 31 1 21 16 26 7 47 -3 - 6 22 38 - 6 39 23 - 5 9 23 - 7 53 34 - 42 0 0 - 5 39 44 21 16 25 9 46 -4 - 5 31 25 - 5 48 4 - 4 18 34 - 7 1 50 - 41 0 0 - 4 49 4 21 16 23 10 46 -6 - 4 40 47 - 4 57 21 - 3 28 21 - 6 10 41 - 40 0 0 - 3 59 1 21 16 21 11 46 -7 - 3 50 48 - 4 7 16 - 2 38 46 - 5 20 10 - 39 0 0 - 3 9 38 21 16 19 13 46 -8 - 3 1 27 - 3 17 49 - 1 49 50 - 4 30 18 - 38 0 0 - 2 20 55 21 16 16 14 46 -9 - 2 12 47 - 2 29 4 - 1 1 36 - 3 41 6 - 37 0 0 - 1 32 54 21 16 14 15 46 -11 - 1 24 49 - 1 41 0 - 0 14 3 - 2 52 36 - 36 0 0 - 0 45 37 21 16 11 16 46 -12 - 0 37 34 - 0 53 39 0 32 46 - 2 4 49 - 35 0 0 0 0 57 21 16 8 18 46 -13 0 8 56 - 0 7 3 1 18 52 - 1 17 46 - 34 0 0 0 46 46 21 16 5 19 46 -14 0 54 42 0 38 49 2 4 12 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Uncertainty in time = +/- 8 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: HIP 25816 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 30 48.6541 DE: +41 27 42.698 * position source: mpos:FK6 LTP pm:FK6 LTP plx:FK6 vrad:FK6 * standard error: RA,DE ["]: ( .018, .020 ) * V mag [mag]: 6.0 * B mag [mag]: 7.1 * Diameter [mas]: 1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3015) Candy approx. diameter [km]: 20 approx. diameter ["]: .011 distance from Earth [AU]: 2.54100 * orbital information: orbit source: Preston date of fit: 2012 Dec 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 903 number of rejected observations: 13 time covered by the observations: 1965 May 02 - 2012 Dec 09 1 sigma uncertainty ellipse (major, minor, PA): 0.059, 0.048, 74° remarks: * orbital elements for (3015) Candy : Mean anomaly = 88.85332014 deg Arg. of pericenter = 301.49771912 deg Long. of node = 38.37309388 deg Inclination = 17.40162420 deg Eccentricity = 0.16986792 Semimajor axis = 3.39746718 AU Perihelion dist = 2.82034651 AU Mag: H = 11.06, G = 0.15 Epoch of elements : MJD 56284.88200000 TDT (2012 Dec 23.882) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 23 3015 Candy 21h 9.7m UT 6.0 5 30 48.654 41 27 42.70HIP 25816 7.1 16.3 22 1.5 2.541 -2.561 1.78 32.4715 41.461 -137.55 -23.41 21.1615 -0.02000 -0.32348 -8.32128 0.51537 0.00097 -0.00182 2000 88.08495320121219.00000301.497719 38.373094 17.4016240.16986792 3.3974672 2.820346511.1 5.00.15 RATE 1.5738780 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.062 0.052 75 5.40 0.053 0 1 1-2 056278.0020121223__25816 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Dec 16, 19:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org