IOTA/IOTA-ES occultation update for (6560) Pravdo / TYC 0226-01371-1 event on 2008 Jan 12, 14:46 UT Visible from N Australia Summary ------- On 2008 Jan 12 UT, the 13 km diameter asteroid (6560) Pravdo will occult a 9.8 mag star in the constellation Hydra 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 6.5 mag to 16.3 mag (the magnitude of the asteroid) for at most 0.9 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: 7 * date and approx. time of event: 2008 Jan 12, 14:39 - 2008 Jan 12, 14:54 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 6.5 * estimated maximum duration [s]: 0.9 * Moon: 18 % sunlit, 153° distance * Sun: 151° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 8.76 * 1 sigma uncertainty interval [seconds]: +/- 7.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .095 +/- .085) * 1 sigma uncertainty ellipse (major, minor, PA): ( .104", .075", 125° ) * approx speed of asteroid's shadow [km/s]: 14.0653 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0226-01371-1 by 6560 Pravdo 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 72 0 0 -26 42 37 14 54 33 1 87 -10 -26 39 5 -26 46 8 -25 37 16 -27 48 1 73 0 0 -26 40 5 14 54 33 2 87 -10 -26 36 34 -26 43 37 -25 34 44 -27 45 31 74 0 0 -26 37 12 14 54 32 3 87 -11 -26 33 40 -26 40 44 -25 31 49 -27 42 39 75 0 0 -26 33 56 14 54 32 3 86 -12 -26 30 24 -26 37 28 -25 28 31 -27 39 25 76 0 0 -26 30 18 14 54 31 4 86 -13 -26 26 46 -26 33 50 -25 24 51 -27 35 49 77 0 0 -26 26 18 14 54 31 5 85 -14 -26 22 46 -26 29 50 -25 20 49 -27 31 51 78 0 0 -26 21 55 14 54 30 6 85 -14 -26 18 23 -26 25 28 -25 16 24 -27 27 31 79 0 0 -26 17 11 14 54 29 7 84 -15 -26 13 38 -26 20 43 -25 11 37 -27 22 48 80 0 0 -26 12 4 14 54 28 8 84 -16 -26 8 31 -26 15 36 -25 6 28 -27 17 44 81 0 0 -26 6 35 14 54 27 9 84 -17 -26 3 2 -26 10 7 -25 0 56 -27 12 18 82 0 0 -26 0 44 14 54 26 10 83 -18 -25 57 11 -26 4 16 -24 55 2 -27 6 29 83 0 0 -25 54 30 14 54 25 11 83 -18 -25 50 57 -25 58 3 -24 48 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270 7 20 23 58 20 16 55 21 25 45 19 15 4 -110 0 0 20 20 28 14 39 29 4 270 8 20 23 59 20 16 56 21 25 46 19 15 5 -109 0 0 20 20 5 14 39 29 3 271 9 20 23 37 20 16 34 21 25 24 19 14 42 -108 0 0 20 19 19 14 39 28 3 271 10 20 22 51 20 15 48 21 24 38 19 13 56 -107 0 0 20 18 10 14 39 28 2 271 11 20 21 42 20 14 38 21 23 29 19 12 46 -106 0 0 20 16 37 14 39 28 1 272 11 20 20 8 20 13 5 21 21 57 19 11 12 Data for the target star ------------------------ * name: TYC 0226-01371-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 00 47.5758 DE: +01 56 44.264 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .022 ) * V mag [mag]: 9.8 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6560) Pravdo approx. diameter [km]: 13 approx. diameter ["]: .011 distance from Earth [AU]: 1.66400 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 424 number of rejected observations: 12 time covered by the observations: 1986 Jan 07 - 2007 Dec 14 1 sigma uncertainty ellipse (major, minor, PA): 0.102, 0.072, 126° remarks: * orbital elements for (6560) Pravdo : Mean anomaly = 221.84580270 deg Arg. of pericenter = 350.16854694 deg Long. of node = 285.13263688 deg Inclination = 23.25028184 deg Eccentricity = 0.11472952 Semimajor axis = 2.35545285 AU Perihelion dist = 2.08521288 AU Mag: H = 12.56, G = 0.15 Epoch of elements : MJD 54477.61600000 TDT (2008 Jan 12.616) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 12 6560 Pravdo 14h 47.0m UT 9.8 9 0 47.576 1 56 44.26TYC 0226-01371-1 10.8 16.3 13 0.9 1.664 -2.570 -16.64 -198.032 1.950 -39.71 -21.68 14.7834 .02252 -.05166 -7.28743 -3.14937 -0.00201 0.00200 2000 219.7693622008 1 5.00000350.168547285.132637 23.2502820.114729522.355452852.0852128812.55 0.15 RATE 2.7264190 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.104 0.075 124.7 9.760 0.094 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org