IOTA/IOTA-ES occultation update for (734) Benda / UCAC2 42053160 event on 2009 Feb 02, 23:21 UT Visible from Summary ------- On 2009 Feb 02 UT, the 71 km diameter asteroid (734) Benda will occult a 11.5 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 14.1 mag (the magnitude of the asteroid) for at most 6.8 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: 83 * date and approx. time of event: 2009 Feb 02, 23:13 - 2009 Feb 02, 23:27 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 6.8 * Moon: 50 % sunlit, 69° distance * Sun: 157° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 98 * 1 sigma uncertainty interval [path widths]: +/- 0.63 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .031", 100° ) * approx speed of asteroid's shadow [km/s]: 10.4887 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 42053160 by 734 Benda on 2009 Feb 2 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 - 99 0 0 51 20 37 23 27 7 22 71 -1 51 56 0 50 45 41 52 41 18 50 2 18 - 98 0 0 51 53 54 23 27 3 23 72 -1 52 29 18 51 18 57 53 14 37 50 35 34 - 97 0 0 52 26 46 23 26 58 24 73 -2 53 2 11 51 51 49 53 47 30 51 8 26 - 96 0 0 52 59 14 23 26 53 24 74 -3 53 34 38 52 24 17 54 19 57 51 40 53 - 95 0 0 53 31 15 23 26 48 25 75 -4 54 6 39 52 56 19 54 51 57 52 12 56 - 94 0 0 54 2 50 23 26 43 26 75 -4 54 38 13 53 27 55 55 23 30 52 44 34 - 93 0 0 54 33 58 23 26 38 26 76 -5 55 9 19 53 59 5 55 54 33 53 15 45 - 92 0 0 55 4 37 23 26 33 27 77 -6 55 39 56 54 29 46 56 25 8 53 46 29 - 91 0 0 55 34 49 23 26 28 28 78 -7 56 10 5 55 0 0 56 55 14 54 16 46 - 90 0 0 56 4 31 23 26 23 28 79 -7 56 39 44 55 29 45 57 24 49 54 46 34 - 89 0 0 56 33 44 23 26 18 29 80 -8 57 8 54 55 59 1 57 53 54 55 15 54 - 88 0 0 57 2 26 23 26 12 30 81 -9 57 37 33 56 27 48 58 22 28 55 44 46 - 87 0 0 57 30 39 23 26 7 30 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Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: UCAC2 42053160 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 43 50.3719 DE: +29 02 34.077 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .023 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (734) Benda approx. diameter [km]: 71 approx. diameter ["]: .049 distance from Earth [AU]: 2.00300 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 843 number of rejected observations: 69 time covered by the observations: 1920 Feb 23 - 2008 Feb 06 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.021, 102° remarks: * orbital elements for (734) Benda : Mean anomaly = 40.75462376 deg Arg. of pericenter = 67.78847085 deg Long. of node = 3.31328280 deg Inclination = 5.79804031 deg Eccentricity = 0.09532811 Semimajor axis = 3.15101975 AU Perihelion dist = 2.85063898 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 54864.97300000 TDT (2009 Feb 02.973) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 2 734 Benda 23h 20.9m UT 11.5 7 43 50.372 29 2 34.08UCAC2 42053160 0.0 14.1 71 6.8 2.003 -1.981 -0.40 -7.5407 29.044 -166.77 -16.55 23.3481 -0.01093 0.68925 -5.91946 -0.08952 0.00205 -0.00112 2000 39.8783382009 129.00000 67.788471 3.313283 5.7980400.09532811 3.1510198 2.8506390 9.7 5.00.15 RATE 1.7620870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.031 100 1.63 0.031 0 54776.5020090202_053160 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 04:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org