IOTA/IOTA-ES occultation update for (1048) Feodosia / TYC 4687-01817-1 event on 2009 Oct 01, 22:14 UT Visible from Summary ------- On 2009 Oct 01 UT, the 60 km diameter asteroid (1048) Feodosia will occult a 10.9 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.3 mag to 14.2 mag (the magnitude of the asteroid) for at most 4.2 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: 78 * date and approx. time of event: 2009 Oct 01, 22:08 - 2009 Oct 01, 22:21 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 4.2 * Moon: 94 % sunlit, 43° distance * Sun: 162° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 0.70 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .028", 75° ) * approx speed of asteroid's shadow [km/s]: 14.2224 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4687-01817-1 by 1048 Feodosia on 2009 Oct 1 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 - 50 0 0 17 20 9 22 21 42 0 95 -18 17 38 53 17 1 28 18 5 13 .. .. .. - 49 0 0 17 15 11 22 21 42 1 96 -19 17 33 55 16 56 31 18 0 14 .. .. .. - 48 0 0 17 10 28 22 21 41 2 96 -20 17 29 12 16 51 49 17 55 30 16 25 46 - 47 0 0 17 6 0 22 21 41 3 96 -21 17 24 43 16 47 20 17 51 0 16 21 19 - 46 0 0 17 1 46 22 21 40 4 96 -22 17 20 28 16 43 7 17 46 45 16 17 6 - 45 0 0 16 57 46 22 21 40 5 97 -23 17 16 28 16 39 8 17 42 45 16 13 7 - 44 0 0 16 54 1 22 21 39 6 97 -24 17 12 43 16 35 23 17 38 59 16 9 23 - 43 0 0 16 50 31 22 21 38 7 97 -25 17 9 12 16 31 53 17 35 28 16 5 54 - 42 0 0 16 47 15 22 21 37 8 98 -26 17 5 56 16 28 38 17 32 11 16 2 39 - 41 0 0 16 44 15 22 21 35 9 98 -27 17 2 55 16 25 37 17 29 10 15 59 39 - 40 0 0 16 41 29 22 21 34 10 98 -28 17 0 9 16 22 52 17 26 23 15 56 54 - 39 0 0 16 38 57 22 21 32 11 98 -29 16 57 37 16 20 21 17 23 51 15 54 23 - 38 0 0 16 36 41 22 21 31 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0 40 3 38 39 26 2 40 30 6 38 59 50 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 4687-01817-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 36 35.6040 DE: -04 56 49.780 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .024 ) * V mag [mag]: 10.9 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1048) Feodosia approx. diameter [km]: 60 approx. diameter ["]: .040 distance from Earth [AU]: 2.09100 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 804 number of rejected observations: 53 time covered by the observations: 1924 Nov 29 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.015, 53° remarks: * orbital elements for (1048) Feodosia : Mean anomaly = 123.45585859 deg Arg. of pericenter = 184.06583508 deg Long. of node = 52.82896094 deg Inclination = 15.80286620 deg Eccentricity = 0.18100951 Semimajor axis = 2.73149942 AU Perihelion dist = 2.23707206 AU Mag: H = 9.63, G = 0.15 Epoch of elements : MJD 55105.92700000 TDT (2009 Oct 01.927) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 1 1048 Feodosia 22h 15.2m UT 10.9 1 36 35.604- 4 56 49.78TYC 4687-01817-1 11.9 14.2 60 4.2 2.091 -2.214 -6.81 39.5839 -4.945 -156.41 -3.52 22.2526 -0.09745 0.47431 -7.86225 -1.62044 -0.00159 0.00083 2000 122.1618502009 926.00000184.065835 52.828961 15.8028660.18100951 2.7314994 2.2370720 9.8 5.00.15 RATE 2.1832450 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.028 75 1.70 0.028 0 54545.5020091001_1817-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org