IOTA/IOTA-ES occultation update for (520) Franziska / HIP 4559 event on 2008 Jan 12, 18:31 UT Visible from Russia, Africa Summary ------- On 2008 Jan 12 UT, the 29 km diameter asteroid (520) Franziska will occult a 6.7 mag star in the constellation Pisces for observers along a path across Russia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 9.2 mag to 15.9 mag (the magnitude of the asteroid) for at most 1.4 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: 54 * date and approx. time of event: 2008 Jan 12, 18:26 - 2008 Jan 12, 18:36 UT * magnitude of target star: 6.7 * magnitude drop [mag]: 9.2 * estimated maximum duration [s]: 1.4 * Moon: 18 % sunlit, 34° distance * Sun: 84° distance * rough path description: Russia, Africa The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 1.18 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .019) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .018", 67° ) * approx speed of asteroid's shadow [km/s]: 20.4090 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 4559 by 520 Franziska on 2008 Jan 12 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 -100 0 0 -22 6 32 18 26 3 1 82 85 -22 14 35 -21 58 28 -22 33 34 -21 39 27 - 99 0 0 -21 58 37 18 26 3 2 82 85 -22 6 40 -21 50 33 -22 25 41 -21 31 30 - 98 0 0 -21 50 9 18 26 4 2 82 86 -21 58 13 -21 42 4 -22 17 16 -21 23 0 - 97 0 0 -21 41 8 18 26 4 3 81 87 -21 49 13 -21 33 3 -22 8 18 -21 13 57 - 96 0 0 -21 31 35 18 26 4 4 81 88 -21 39 41 -21 23 28 -21 58 47 -21 4 20 - 95 0 0 -21 21 28 18 26 5 5 80 88 -21 29 35 -21 13 21 -21 48 43 -20 54 10 - 94 0 0 -21 10 48 18 26 5 6 80 88 -21 18 55 -21 2 40 -21 38 5 -20 43 27 - 93 0 0 -20 59 34 18 26 6 7 80 88 -21 7 43 -20 51 25 -21 26 55 -20 32 11 - 92 0 0 -20 47 47 18 26 7 8 79 87 -20 55 57 -20 39 37 -21 15 11 -20 20 21 - 91 0 0 -20 35 27 18 26 7 9 79 86 -20 43 37 -20 27 16 -21 2 54 -20 7 57 - 90 0 0 -20 22 32 18 26 8 10 79 85 -20 30 44 -20 14 20 -20 50 3 -19 54 59 - 89 0 0 -20 9 4 18 26 9 11 78 84 -20 17 17 -20 0 51 -20 36 39 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42 6 32 41 31 23 42 25 35 Data for the target star ------------------------ * name: HIP 4559 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 58 19.4707 DE: +06 50 39.469 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .015, .008 ) * V mag [mag]: 6.7 * B mag [mag]: 7.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (520) Franziska approx. diameter [km]: 29 approx. diameter ["]: .015 distance from Earth [AU]: 2.61500 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 803 number of rejected observations: 24 time covered by the observations: 1903 Oct 28 - 2007 Dec 15 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.016, 55° remarks: * orbital elements for (520) Franziska : Mean anomaly = 344.00889217 deg Arg. of pericenter = 22.75061311 deg Long. of node = 34.47216123 deg Inclination = 10.96180448 deg Eccentricity = 0.10685037 Semimajor axis = 3.00617286 AU Perihelion dist = 2.68496217 AU Mag: H = 10.46, G = 0.15 Epoch of elements : MJD 54477.77200000 TDT (2008 Jan 12.772) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 12 520 Franziska 18h 31.2m UT 6.7 0 58 19.471 6 50 39.47HIP 4559 7.8 15.9 29 1.4 2.615 2.202 20.63 -14.845 6.839 264.26 -21.65 18.5196 -.09320 .14543 9.75034 6.13417 0.00546 0.00228 2000 342.5392352008 1 5.00000 22.750613 34.472161 10.9618040.106850373.006172862.6849621710.65 0.15 RATE 1.8909630 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.025 0.018 66.8 2.180 0.018 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 03, 00:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org