IOTA/IOTA-ES occultation update for (255) Oppavia / TYC 2944-01269-1 event on 2008 Jan 11, 07:53 UT Visible from S Canada, USA Summary ------- On 2008 Jan 11 UT, the 57 km diameter asteroid (255) Oppavia will occult a 12.3 mag star in the constellation Auriga for observers along a path across S Canada, USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 14.0 mag (the magnitude of the asteroid) for at most 5.0 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: 80 * date and approx. time of event: 2008 Jan 11, 07:44 - 2008 Jan 11, 08:02 UT * midpoint of event [JD]: 2454476.82869167 * magnitude of target star: 12.3 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 5.0 * Moon: 9 % sunlit, 138° distance * Sun: 164° distance * rough path description: S Canada, USA The occultation path -------------------- * approximate projected width [km]: 58 * 1 sigma uncertainty interval [path widths]: +/- 0.67 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .032", 93° ) * approx speed of asteroid's shadow [km/s]: 11.4737 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2944-01269-1 by 255 Oppavia on 2008 Jan 11 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 138 0 0 12 37 3 8 2 24 0 51 7 12 57 9 12 16 59 13 24 7 .. .. .. 139 0 0 13 24 0 8 2 24 1 52 6 13 44 6 13 3 56 14 11 5 12 37 5 140 0 0 14 10 48 8 2 23 3 52 5 14 30 53 13 50 44 14 57 51 13 23 53 141 0 0 14 57 23 8 2 23 4 52 4 15 17 28 14 37 19 15 44 25 14 10 29 142 0 0 15 43 44 8 2 22 5 52 3 16 3 48 15 23 41 16 30 44 14 56 52 143 0 0 16 29 49 8 2 20 6 53 1 16 49 52 16 9 48 17 16 47 15 43 0 144 0 0 17 15 37 8 2 19 8 53 0 17 35 39 16 55 37 18 2 32 16 28 51 145 0 0 18 1 6 8 2 17 9 53 -1 18 21 7 17 41 7 18 47 58 17 14 23 146 0 0 18 46 15 8 2 15 10 54 -2 19 6 14 18 26 17 19 33 3 17 59 35 147 0 0 19 31 1 8 2 13 11 54 -3 19 50 58 19 11 6 20 17 45 18 44 26 148 0 0 20 15 24 8 2 10 12 54 -4 20 35 19 19 55 30 21 2 3 19 28 54 149 0 0 20 59 22 8 2 8 14 55 -6 21 19 15 20 39 31 21 45 56 20 12 57 150 0 0 21 42 54 8 2 5 15 55 -7 22 2 44 21 23 5 22 29 22 20 56 34 151 0 0 22 25 58 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57 - 24 0 0 5 51 48 7 44 14 0 308 -2 6 11 41 5 31 56 6 38 21 .. .. .. Data for the target star ------------------------ * name: TYC 2944-01269-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 12 46.6844 DE: +37 32 34.249 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .027 ) * V mag [mag]: 12.3 * B mag [mag]: 12.5 * Apparent position with proper motion RA(deg): 108.3409080663 DE(deg): 37.5298879412 * Equation of equinoxes (radians) : 0.000042467514006 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (255) Oppavia approx. diameter [km]: 57 approx. diameter ["]: .047 distance from Earth [AU]: 1.66300 * orbital information: orbit source: Preston date of fit: 2008 Jan 10 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 915 number of rejected observations: 73 time covered by the observations: 1904 Mar 15 - 2008 Jan 10 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.017, 96° remarks: * orbital elements for (255) Oppavia : Mean anomaly = 307.88523843 deg Arg. of pericenter = 152.94613066 deg Long. of node = 13.76581547 deg Inclination = 9.48371489 deg Eccentricity = 0.08013639 Semimajor axis = 2.74563236 AU Perihelion dist = 2.52560729 AU Mag: H = 10.21, G = 0.15 Epoch of elements : MJD 54476.32900000 TDT (2008 Jan 11.329) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 11 255 Oppavia 7h 53.3m UT 12.3 7 12 46.684 37 32 34.25TYC 2944-01269-1 12.5 14.0 57 5.0 1.663 -2.871 2.58 -120.344 37.542 63.59 -21.88 7.8886 .01491 .19624 -6.45744 0.49077 0.00038 -0.00159 2000 306.5141172008 1 5.00000152.946131 13.765815 9.4837150.080136392.745632362.5256072910.35 0.15 RATE 2.1664090 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.040 0.032 93.1 1.670 0.032 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 11, 02:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org