IOTA/IOTA-ES occultation update for (80) Sappho / UCAC2 32865594 event on 2009 Feb 05, 10:06 UT Visible from Summary ------- On 2009 Feb 05 UT, the 78 km diameter asteroid (80) Sappho will occult a 11.7 mag star in the constellation Hydra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.7 mag to 11.5 mag (the magnitude of the asteroid) for at most 6.0 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: 92 * date and approx. time of event: 2009 Feb 05, 10:01 - 2009 Feb 05, 10:11 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 6.0 * Moon: 77 % sunlit, 58° distance * Sun: 166° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.50 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .032", 92° ) * approx speed of asteroid's shadow [km/s]: 13.0777 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 32865594 by 80 Sappho on 2009 Feb 5 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 106 0 0 72 25 21 10 11 9 0 80 -11 73 1 18 71 49 55 73 37 46 .. .. .. 107 0 0 72 28 24 10 11 9 0 81 -11 73 4 17 71 53 1 73 40 42 .. .. .. 108 0 0 72 31 15 10 11 9 1 82 -11 73 7 5 71 55 55 73 43 27 .. .. .. 109 0 0 72 33 56 10 11 9 1 83 -12 73 9 43 71 58 39 73 46 2 .. .. .. 110 0 0 72 36 25 10 11 9 1 84 -12 73 12 10 72 1 11 73 48 26 .. .. .. 111 0 0 72 38 44 10 11 9 2 85 -12 73 14 26 72 3 32 73 50 40 .. .. .. 112 0 0 72 40 53 10 11 9 2 86 -12 73 16 32 72 5 43 73 52 43 71 31 1 113 0 0 72 42 50 10 11 8 2 87 -13 73 18 28 72 7 42 73 54 36 71 33 2 114 0 0 72 44 37 10 11 8 3 88 -13 73 20 13 72 9 31 73 56 19 71 34 53 115 0 0 72 46 13 10 11 8 3 89 -13 73 21 47 72 11 9 73 57 52 71 36 32 116 0 0 72 47 39 10 11 8 3 90 -14 73 23 11 72 12 36 73 59 15 71 38 1 117 0 0 72 48 54 10 11 8 3 91 -14 73 24 26 72 13 53 74 0 27 71 39 19 118 0 0 72 49 59 10 11 7 4 92 -14 73 25 29 72 14 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Uncertainty in time = +/- 4 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: UCAC2 32865594 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 53 42.9160 DE: +03 05 10.997 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .043, .030 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (80) Sappho approx. diameter [km]: 78 approx. diameter ["]: .067 distance from Earth [AU]: 1.61700 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 895 number of rejected observations: 180 time covered by the observations: 1903 Oct 24 - 2008 Feb 29 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.010, 106° remarks: * orbital elements for (80) Sappho : Mean anomaly = 120.12489181 deg Arg. of pericenter = 139.27886823 deg Long. of node = 218.79830490 deg Inclination = 8.66145031 deg Eccentricity = 0.19996648 Semimajor axis = 2.29631375 AU Perihelion dist = 1.83712797 AU Mag: H = 7.96, G = 0.15 Epoch of elements : MJD 54867.42100000 TDT (2009 Feb 05.421) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 5 80 Sappho 10h 6.3m UT 11.7 8 53 42.916 3 5 11.00UCAC2 32865594 0.0 11.5 78 6.0 1.617 -2.530 13.20 -153.8421 3.084 31.93 -15.82 10.1052 0.26305 0.75530 -6.97106 2.42679 0.00058 0.00128 2000 118.0229552009 129.00000139.278868218.798305 8.6614500.19996648 2.2963138 1.8371280 8.0 5.00.15 RATE 2.8324170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.045 0.032 92 1.50 0.033 0 54776.5020090205_865594 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org