IOTA/IOTA-ES occultation update for (194) Prokne / TYC 6387-00721-1 event on 2007 Dec 09, 12:14 UT Visible from Indonesia, Philippines Summary ------- On 2007 Dec 09 UT, the 168 km diameter asteroid (194) Prokne will occult a 9.9 mag star in the constellation Aquarius for observers along a path across Indonesia, Philippines. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 12.1 mag (the magnitude of the asteroid) for at most 6.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, 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: 99 * date and approx. time of event: 2007 Dec 09, 12:09 - 2007 Dec 09, 12:18 UT * magnitude of target star: 9.9 * magnitude drop [mag]: 2.3 * estimated maximum duration [s]: 6.7 * Moon: 0 % sunlit, 83° distance * Sun: 81° distance * rough path description: Indonesia, Philippines The occultation path -------------------- * approximate projected width [km]: 169 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .020", 90° ) * approx speed of asteroid's shadow [km/s]: 24.9433 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6387-00721-1 by 194 Prokne on 2007 Dec 09 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 - 9 0 0 - 8 32 44 12 9 39 1 107 75 - 9 20 32 - 7 44 51 - 9 37 43 - 7 27 36 - 8 0 0 - 8 50 26 12 9 39 2 107 76 - 9 38 10 - 8 2 38 - 9 55 20 - 7 45 24 - 7 0 0 - 9 7 50 12 9 39 3 106 76 - 9 55 30 - 8 20 5 -10 12 38 - 8 2 53 - 6 0 0 - 9 24 54 12 9 39 4 106 76 -10 12 30 - 8 37 14 -10 29 38 - 8 20 3 - 5 0 0 - 9 41 40 12 9 39 5 106 77 -10 29 12 - 8 54 3 -10 46 18 - 8 36 53 - 4 0 0 - 9 58 5 12 9 40 6 106 77 -10 45 34 - 9 10 33 -11 2 38 - 8 53 24 - 3 0 0 -10 14 12 12 9 40 7 106 77 -11 1 36 - 9 26 43 -11 18 39 - 9 9 36 - 2 0 0 -10 29 58 12 9 41 8 106 77 -11 17 18 - 9 42 32 -11 34 20 - 9 25 27 - 1 0 0 -10 45 23 12 9 42 9 105 77 -11 32 40 - 9 58 2 -11 49 40 - 9 40 58 0 0 0 -11 0 29 12 9 42 10 105 77 -11 47 42 -10 13 11 -12 4 41 - 9 56 9 1 0 0 -11 15 13 12 9 43 11 105 77 -12 2 23 -10 28 0 -12 19 20 -10 10 58 2 0 0 -11 29 37 12 9 44 12 105 77 -12 16 43 -10 42 27 -12 33 39 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Data for the target star ------------------------ * name: TYC 6387-00721-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 52 02.8214 DE: -16 40 39.231 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .019 ) * V mag [mag]: 9.9 * B mag [mag]: 10.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (194) Prokne approx. diameter [km]: 168 approx. diameter ["]: .114 distance from Earth [AU]: 2.03000 * orbital information: orbit source: Preston date of fit: 2007 Dec 05 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 822 number of rejected observations: 135 time covered by the observations: 1913 Apr 04 - 2007 Dec 05 1 sigma uncertainty ellipse (major, minor, PA): 0.009, 0.006, 90° remarks: * orbital elements for (194) Prokne : Mean anomaly = 27.79798442 deg Arg. of pericenter = 162.88635700 deg Long. of node = 159.48411567 deg Inclination = 18.48576601 deg Eccentricity = 0.23571559 Semimajor axis = 2.61722519 AU Perihelion dist = 2.00030441 AU Mag: H = 7.67, G = 0.15 Epoch of elements : MJD 54443.51000000 TDT (2007 Dec 09.510) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Dec 09 194 Prokne 12h 13.9m UT 9.9 22 52 2.821-16 40 39.23TYC 6387-00721-1 10.6 12.1 168 6.7 2.030 4.097 15.87 81.682 -16.682 -5.41 -22.81 12.2312 -.03012 .10775 13.59348 3.66420 0.00517 0.00201 2000 26.9809322200712 6.00000162.886357159.484116 18.4857660.235715592.617225192.000304417.685 0.15 RATE 2.3277827 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.022 0.020 90.0 1.180 0.020 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 06, 01:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org