IOTA/IOTA-ES occultation update for (204) Kallisto / TYC 0221-00505-1 event on 2008 Feb 02, 19:34 UT Visible from Australia Summary ------- On 2008 Feb 02 UT, the 48 km diameter asteroid (204) Kallisto will occult a 10.5 mag star in the constellation Hydra for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 13.0 mag (the magnitude of the asteroid) for at most 3.5 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: 76 * date and approx. time of event: 2008 Feb 02, 19:26 - 2008 Feb 02, 19:41 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 3.5 * Moon: 19 % sunlit, 125° distance * Sun: 168° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 0.73 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .025", 98° ) * approx speed of asteroid's shadow [km/s]: 13.6437 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0221-00505-1 by 204 Kallisto on 2008 Feb 02 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 8 46 15 19 41 50 1 85 -1 8 59 30 8 33 0 9 18 49 8 13 38 - 23 0 0 8 51 10 19 41 50 2 85 -2 9 4 25 8 37 56 9 23 43 8 18 34 - 22 0 0 8 55 45 19 41 49 3 85 -3 9 8 59 8 42 31 9 28 17 8 23 10 - 21 0 0 9 0 0 19 41 49 4 85 -4 9 13 13 8 46 46 9 32 31 8 27 25 - 20 0 0 9 3 54 19 41 48 5 86 -5 9 17 8 8 50 41 9 36 25 8 31 21 - 19 0 0 9 7 29 19 41 48 6 86 -5 9 20 42 8 54 15 9 39 58 8 34 56 - 18 0 0 9 10 43 19 41 47 7 86 -6 9 23 56 8 57 30 9 43 12 8 38 11 - 17 0 0 9 13 37 19 41 46 8 86 -7 9 26 50 9 0 24 9 46 6 8 41 6 - 16 0 0 9 16 11 19 41 45 9 86 -8 9 29 24 9 2 59 9 48 39 8 43 40 - 15 0 0 9 18 25 19 41 43 10 86 -9 9 31 37 9 5 13 9 50 53 8 45 55 - 14 0 0 9 20 19 19 41 42 11 87 -10 9 33 31 9 7 7 9 52 46 8 47 49 - 13 0 0 9 21 53 19 41 40 12 87 -11 9 35 5 9 8 41 9 54 20 8 49 23 - 12 0 0 9 23 7 19 41 39 13 87 -12 9 36 19 9 9 55 9 55 33 8 50 38 - 11 0 0 9 24 1 19 41 37 14 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4 Data for the target star ------------------------ * name: TYC 0221-00505-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 54 43.3124 DE: +05 05 58.007 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.5 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (204) Kallisto approx. diameter [km]: 48 approx. diameter ["]: .034 distance from Earth [AU]: 1.92300 * orbital information: orbit source: Preston date of fit: 2008 Jan 17 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 858 number of rejected observations: 99 time covered by the observations: 1917 Apr 16 - 2008 Jan 10 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 104° remarks: * orbital elements for (204) Kallisto : Mean anomaly = 249.82877289 deg Arg. of pericenter = 55.93316115 deg Long. of node = 205.19955593 deg Inclination = 8.27076339 deg Eccentricity = 0.17209498 Semimajor axis = 2.67275951 AU Perihelion dist = 2.21279102 AU Mag: H = 8.76, G = 0.15 Epoch of elements : MJD 54498.81600000 TDT (2008 Feb 02.816) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 02 204 Kallisto 19h 34.1m UT 10.5 8 54 43.312 5 5 58.01TYC 0221-00505-1 11.5 13.0 48 3.5 1.923 -2.241 10.92 67.770 5.096 249.89 -16.82 19.5691 -.05043 -.15490 -7.32180 2.38633 0.00018 0.00123 2000 247.8402262008 125.00000 55.933161205.199556 8.2707630.172094982.672759512.212791028.895 0.15 RATE 2.2556110 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.030 0.025 97.7 1.730 0.025 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 17, 18:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org