IOTA/IOTA-ES occultation update for (881) Athene / TYC 0792-00097-1 event on 2008 Jan 04, 20:27 UT Visible from Hong Kong, China, India, Africa Summary ------- On 2008 Jan 04 UT, the 29 km diameter asteroid (881) Athene will occult a 9.7 mag star in the constellation Gemini for observers along a path across Hong Kong, China, India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 14.8 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: 28 * date and approx. time of event: 2008 Jan 04, 20:20 - 2008 Jan 04, 20:34 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 1.9 * Moon: 12 % sunlit, 125° distance * Sun: 165° distance * rough path description: Hong Kong, China, India, Africa The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 2.39 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .050 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .045", 108° ) * approx speed of asteroid's shadow [km/s]: 15.2328 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0792-00097-1 by 881 Athene on 2008 Jan 04 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 - 24 0 0 2 22 13 20 34 31 0 75 -13 2 30 25 2 14 1 3 9 38 .. .. .. - 23 0 0 2 38 13 20 34 31 1 75 -14 2 46 25 2 30 1 3 25 39 .. .. .. - 22 0 0 2 54 18 20 34 31 2 75 -15 3 2 30 2 46 6 3 41 45 2 6 56 - 21 0 0 3 10 27 20 34 30 3 75 -16 3 18 40 3 2 15 3 57 55 2 23 4 - 20 0 0 3 26 42 20 34 30 4 75 -17 3 34 54 3 18 29 4 14 10 2 39 18 - 19 0 0 3 43 0 20 34 29 5 75 -18 3 51 12 3 34 47 4 30 29 2 55 35 - 18 0 0 3 59 21 20 34 29 6 76 -19 4 7 34 3 51 9 4 46 52 3 11 56 - 17 0 0 4 15 46 20 34 28 7 76 -20 4 23 59 4 7 34 5 3 17 3 28 20 - 16 0 0 4 32 14 20 34 27 8 76 -21 4 40 27 4 24 1 5 19 46 3 44 47 - 15 0 0 4 48 45 20 34 25 9 76 -22 4 56 58 4 40 32 5 36 17 4 1 17 - 14 0 0 5 5 18 20 34 24 10 76 -23 5 13 31 4 57 5 5 52 50 4 17 50 - 13 0 0 5 21 53 20 34 23 11 76 -25 5 30 6 5 13 39 6 9 26 4 34 24 - 12 0 0 5 38 29 20 34 21 12 76 -26 5 46 42 5 30 16 6 26 2 4 51 0 - 11 0 0 5 55 7 20 34 19 13 76 -27 6 3 20 5 46 53 6 42 40 5 7 38 - 10 0 0 6 11 45 20 34 18 15 76 -28 6 19 58 6 3 32 6 59 19 5 24 16 - 9 0 0 6 28 24 20 34 16 16 76 -29 6 36 38 6 20 11 7 15 58 5 40 55 - 8 0 0 6 45 3 20 34 14 17 77 -30 6 53 17 6 36 50 7 32 38 5 57 34 - 7 0 0 7 1 42 20 34 11 18 77 -31 7 9 56 6 53 29 7 49 17 6 14 13 - 6 0 0 7 18 21 20 34 9 19 77 -32 7 26 34 7 10 8 8 5 55 6 30 51 - 5 0 0 7 34 59 20 34 7 20 77 -33 7 43 12 7 26 45 8 22 33 6 47 29 - 4 0 0 7 51 35 20 34 4 21 77 -34 7 59 49 7 43 22 8 39 9 7 4 6 - 3 0 0 8 8 10 20 34 1 22 77 -35 8 16 24 7 59 57 8 55 44 7 20 41 - 2 0 0 8 24 44 20 33 58 23 77 -36 8 32 57 8 16 30 9 12 17 7 37 15 - 1 0 0 8 41 15 20 33 56 24 78 -37 8 49 28 8 33 1 9 28 48 7 53 46 0 0 0 8 57 43 20 33 52 25 78 -38 9 5 56 8 49 30 9 45 16 8 10 15 1 0 0 9 14 9 20 33 49 26 78 -39 9 22 22 9 5 56 10 1 41 8 26 41 2 0 0 9 30 31 20 33 46 27 78 -40 9 38 44 9 22 19 10 18 3 8 43 4 3 0 0 9 46 51 20 33 43 28 78 -41 9 55 3 9 38 38 10 34 22 8 59 24 4 0 0 10 3 6 20 33 39 29 79 -42 10 11 19 9 54 53 10 50 37 9 15 40 5 0 0 10 19 17 20 33 35 30 79 -43 10 27 30 10 11 4 11 6 47 9 31 52 6 0 0 10 35 24 20 33 32 31 79 -44 10 43 37 10 27 11 11 22 53 9 47 59 7 0 0 10 51 26 20 33 28 32 79 -45 10 59 38 10 43 14 11 38 55 10 4 2 8 0 0 11 7 23 20 33 24 33 79 -46 11 15 35 10 59 11 11 54 51 10 20 0 9 0 0 11 23 15 20 33 20 34 80 -47 11 31 27 11 15 3 12 10 42 10 35 53 10 0 0 11 39 1 20 33 16 35 80 -48 11 47 13 11 30 49 12 26 27 10 51 40 11 0 0 11 54 41 20 33 12 36 80 -49 12 2 53 11 46 30 12 42 6 11 7 22 12 0 0 12 10 16 20 33 7 37 80 -50 12 18 27 12 2 4 12 57 39 11 22 57 13 0 0 12 25 43 20 33 3 38 81 -51 12 33 55 12 17 32 13 13 6 11 38 26 14 0 0 12 41 4 20 32 58 39 81 -52 12 49 16 12 32 53 13 28 26 11 53 48 15 0 0 12 56 18 20 32 54 40 81 -53 13 4 29 12 48 8 13 43 39 12 9 3 16 0 0 13 11 25 20 32 49 41 82 -54 13 19 36 13 3 15 13 58 44 12 24 11 17 0 0 13 26 25 20 32 44 42 82 -55 13 34 35 13 18 14 14 13 42 12 39 12 18 0 0 13 41 16 20 32 39 43 82 -56 13 49 26 13 33 6 14 28 32 12 54 5 19 0 0 13 56 0 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13 6 36 11 31 49 162 0 0 12 3 23 20 20 41 1 285 10 12 11 35 11 55 11 12 50 50 .. .. .. 163 0 0 11 47 29 20 20 40 0 285 11 11 55 42 11 39 17 12 34 57 .. .. .. Data for the target star ------------------------ * name: TYC 0792-00097-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 55 24.4075 DE: +14 48 29.342 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .018 ) * V mag [mag]: 9.7 * B mag [mag]: 10.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (881) Athene approx. diameter [km]: 29 approx. diameter ["]: .019 distance from Earth [AU]: 2.12000 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 725 number of rejected observations: 18 time covered by the observations: 1934 Aug 08 - 2007 Dec 16 1 sigma uncertainty ellipse (major, minor, PA): 0.046, 0.041, 112° remarks: * orbital elements for (881) Athene : Mean anomaly = 143.65510057 deg Arg. of pericenter = 41.54610251 deg Long. of node = 277.22733463 deg Inclination = 14.18334238 deg Eccentricity = 0.20627075 Semimajor axis = 2.61376964 AU Perihelion dist = 2.07462541 AU Mag: H = 11.66, G = 0.15 Epoch of elements : MJD 54469.85300000 TDT (2008 Jan 04.853) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 04 881 Athene 20h 27.6m UT 9.7 7 55 24.408 14 48 29.34TYC 0792-00097-1 10.6 14.8 29 1.9 2.120 -2.451 -3.01 68.127 14.809 234.32 -22.72 20.4599 -.01032 .12574 -8.56713 -0.72566 -0.00136 0.00088 2000 141.35698620071226.00000 41.546103277.227335 14.1833420.206270752.613769642.0746254110.35 0.15 RATE 2.3324010 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.050 0.045 108.4 3.390 0.045 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org