IOTA/IOTA-ES occultation update for (2089) Cetacea / HIP 75756 event on 2008 May 10, 10:45 UT Visible from N Australia Summary ------- On 2008 May 10 UT, the 21 km diameter asteroid (2089) Cetacea will occult a 7.1 mag star in the constellation Serpens for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.1 mag to 15.2 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: 20 * date and approx. time of event: 2008 May 10, 10:38 - 2008 May 10, 10:52 UT * magnitude of target star: 7.1 * magnitude drop [mag]: 8.1 * estimated maximum duration [s]: 1.5 * Moon: 31 % sunlit, 109° distance * Sun: 161° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 3.39 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .066 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .050", 109° ) * approx speed of asteroid's shadow [km/s]: 13.7649 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 75756 by 2089 Cetacea on 2008 May 10 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 111 0 0 -22 15 15 10 52 20 0 89 -11 -22 8 51 -22 21 39 .. .. .. -23 5 13 112 0 0 -22 14 43 10 52 20 1 89 -12 -22 8 19 -22 21 7 .. .. .. -23 4 41 113 0 0 -22 14 16 10 52 19 2 89 -13 -22 7 53 -22 20 40 .. .. .. -23 4 14 114 0 0 -22 13 55 10 52 19 3 88 -14 -22 7 32 -22 20 19 .. .. .. -23 3 53 115 0 0 -22 13 40 10 52 19 4 88 -15 -22 7 16 -22 20 4 .. .. .. -23 3 38 116 0 0 -22 13 31 10 52 18 5 87 -16 -22 7 7 -22 19 55 .. .. .. -23 3 28 117 0 0 -22 13 27 10 52 17 6 87 -16 -22 7 3 -22 19 51 -21 23 51 -23 3 24 118 0 0 -22 13 29 10 52 16 7 87 -17 -22 7 5 -22 19 53 -21 23 53 -23 3 26 119 0 0 -22 13 36 10 52 15 8 86 -18 -22 7 12 -22 20 0 -21 24 1 -23 3 33 120 0 0 -22 13 49 10 52 14 8 86 -19 -22 7 26 -22 20 13 -21 24 14 -23 3 46 121 0 0 -22 14 8 10 52 13 9 86 -20 -22 7 44 -22 20 32 -21 24 33 -23 4 5 122 0 0 -22 14 32 10 52 11 10 85 -21 -22 8 9 -22 20 56 -21 24 57 -23 4 29 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-17 -31 50 10 -32 2 58 -31 6 58 -32 46 32 - 79 0 0 -31 58 17 10 38 44 11 277 -16 -31 51 53 -32 4 41 -31 8 41 -32 48 14 - 78 0 0 -31 59 54 10 38 43 10 277 -15 -31 53 30 -32 6 18 -31 10 19 -32 49 51 - 77 0 0 -32 1 27 10 38 42 9 276 -15 -31 55 3 -32 7 51 -31 11 52 -32 51 24 - 76 0 0 -32 2 54 10 38 40 8 276 -14 -31 56 31 -32 9 18 -31 13 20 -32 52 51 - 75 0 0 -32 4 17 10 38 39 7 275 -13 -31 57 54 -32 10 41 -31 14 42 -32 54 14 - 74 0 0 -32 5 35 10 38 39 6 275 -12 -31 59 11 -32 11 59 -31 16 0 -32 55 31 - 73 0 0 -32 6 48 10 38 38 6 274 -11 -32 0 24 -32 13 12 -31 17 13 -32 56 44 - 72 0 0 -32 7 55 10 38 37 5 274 -10 -32 1 32 -32 14 19 -31 18 21 -32 57 51 - 71 0 0 -32 8 58 10 38 36 4 273 -10 -32 2 35 -32 15 22 .. .. .. -32 58 54 - 70 0 0 -32 9 56 10 38 36 3 273 -9 -32 3 32 -32 16 19 .. .. .. -32 59 51 - 69 0 0 -32 10 48 10 38 36 2 272 -8 -32 4 25 -32 17 12 .. .. .. -33 0 44 - 68 0 0 -32 11 35 10 38 35 1 272 -7 -32 5 12 -32 17 59 .. .. .. -33 1 31 - 67 0 0 -32 12 18 10 38 35 1 271 -6 -32 5 54 -32 18 41 .. .. .. -33 2 13 Uncertainty in time = +/- 7 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: HIP 75756 * constellation : Serpens * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 28 32.9552 DE: +00 36 25.455 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .016, .013 ) * V mag [mag]: 7.1 * B mag [mag]: 7.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2089) Cetacea approx. diameter [km]: 21 approx. diameter ["]: .015 distance from Earth [AU]: 1.92600 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 647 number of rejected observations: 20 time covered by the observations: 1939 Mar 23 - 2008 Apr 08 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.048, 110° remarks: * orbital elements for (2089) Cetacea : Mean anomaly = 205.52166401 deg Arg. of pericenter = 286.93763516 deg Long. of node = 102.80763797 deg Inclination = 15.39573423 deg Eccentricity = 0.15616772 Semimajor axis = 2.53329900 AU Perihelion dist = 2.13767948 AU Mag: H = 11.19, G = 0.15 Epoch of elements : MJD 54596.44800000 TDT (2008 May 10.448) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 10 2089 Cetacea 10h 45.5m UT 7.1 15 28 32.955 0 36 25.46HIP 75756 7.5 15.2 21 1.5 1.926 -2.357 3.05 -157.8344 0.606 17.74 17.78 10.7576 -0.03928 -0.45321 -7.74029 0.67062 -0.00040 -0.00180 2000 203.9455072008 5 4.00000286.937635102.807638 15.3957340.15616772 2.5332990 2.137679511.0 5.00.15 RATE 2.4444120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.068 0.050 109 4.39 0.051 0 54594.5020080510__75756 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 02:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org