IOTA/IOTA-ES occultation update for (145) Adeona / HIP 9152 event on 2012 Oct 30, 20:43 UT Visible from Indonesia, Africa Summary ------- On 2012 Oct 30 UT, the 141 km diameter asteroid (145) Adeona will occult a 8.8 mag star in the constellation Cetus for observers along a path across Indonesia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 11.9 mag (the magnitude of the asteroid) for at most 11.8 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: 99 * date and approx. time of event: 2012 Oct 30, 20:34 - 2012 Oct 30, 20:52 UT * geocentric midpoint of event [JD]: 2456231.36347917 * magnitude of target star: 8.8 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 11.8 * Moon: 99 % sunlit, 28° distance * Sun: 161° distance * rough path description: Indonesia, Africa The occultation path -------------------- * approximate projected width [km]: 141 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .019", 76° ) * approx speed of asteroid's shadow [km/s]: 11.9915 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 9152 by 145 Adeona on 2012 Oct 30 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 - 7 12 36 20 52 10 8 93 0 - 6 34 13 - 7 51 1 - 6 21 10 - 8 4 5 - 44 0 0 - 7 15 57 20 52 8 9 93 -1 - 6 37 34 - 7 54 21 - 6 24 31 - 8 7 25 - 43 0 0 - 7 19 14 20 52 7 10 92 -2 - 6 40 51 - 7 57 39 - 6 27 48 - 8 10 43 - 42 0 0 - 7 22 27 20 52 5 11 92 -3 - 6 44 5 - 8 0 52 - 6 31 2 - 8 13 56 - 41 0 0 - 7 25 37 20 52 3 12 92 -4 - 6 47 15 - 8 4 1 - 6 34 12 - 8 17 5 - 40 0 0 - 7 28 43 20 52 1 13 92 -5 - 6 50 21 - 8 7 7 - 6 37 18 - 8 20 11 - 39 0 0 - 7 31 45 20 51 59 14 92 -6 - 6 53 23 - 8 10 9 - 6 40 20 - 8 23 13 - 38 0 0 - 7 34 43 20 51 57 15 92 -7 - 6 56 21 - 8 13 7 - 6 43 19 - 8 26 11 - 37 0 0 - 7 37 38 20 51 54 16 92 -8 - 6 59 15 - 8 16 1 - 6 46 13 - 8 29 5 - 36 0 0 - 7 40 28 20 51 52 17 91 -9 - 7 2 6 - 8 18 52 - 6 49 3 - 8 31 55 - 35 0 0 - 7 43 14 20 51 49 18 91 -10 - 7 4 52 - 8 21 38 - 6 51 50 - 8 34 41 - 34 0 0 - 7 45 56 20 51 46 19 91 -11 - 7 7 34 - 8 24 20 - 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0 44 24 - 2 27 23 128 0 0 - 1 31 50 20 34 35 4 266 -9 - 0 53 25 - 2 10 17 - 0 40 22 - 2 23 21 129 0 0 - 1 27 51 20 34 35 3 266 -8 - 0 49 26 - 2 6 17 - 0 36 23 - 2 19 22 130 0 0 - 1 23 54 20 34 34 2 266 -7 - 0 45 30 - 2 2 20 - 0 32 26 - 2 15 25 131 0 0 - 1 20 0 20 34 34 1 266 -6 - 0 41 36 - 1 58 26 - 0 28 33 - 2 11 31 Uncertainty in time = +/- 3 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: HIP 9152 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 57 55.5380 DE: -03 42 44.961 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .020, .015 ) * V mag [mag]: 8.8 * B mag [mag]: 9.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (145) Adeona approx. diameter [km]: 141 approx. diameter ["]: .116 distance from Earth [AU]: 1.66900 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 853 number of rejected observations: 70 time covered by the observations: 1914 Apr 28 - 2012 Oct 06 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.012, 63° remarks: * orbital elements for (145) Adeona : Mean anomaly = 284.77701929 deg Arg. of pericenter = 44.22489728 deg Long. of node = 77.43960714 deg Inclination = 12.63933585 deg Eccentricity = 0.14551877 Semimajor axis = 2.67268511 AU Perihelion dist = 2.28375926 AU Mag: H = 8.08, G = 0.15 Epoch of elements : MJD 56230.86400000 TDT (2012 Oct 30.864) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 30 145 Adeona 20h 43.4m UT 8.8 1 57 55.538- 3 42 44.96HIP 9152 9.3 11.9 141 11.8 1.669 -2.380 -1.66 39.0631 -3.712 -134.94 -14.12 20.7235 0.00365 -0.06939 -6.76087 -0.31756 0.00056 0.00175 2000 284.58212620121030.00000 44.224897 77.439607 12.6393360.14551877 2.6726851 2.2837593 8.1 5.00.15 RATE 2.2557050 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.019 76 1.17 0.020 0 0 0-1 056226.0020121030_P_9152 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org