IOTA/IOTA-ES occultation update for (976) Benjamina / TYC 5746-00123-1 event on 2009 Jul 04, 19:48 UT Visible from Summary ------- On 2009 Jul 04 UT, the 81 km diameter asteroid (976) Benjamina will occult a 10.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 13.9 mag (the magnitude of the asteroid) for at most 6.6 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 Jul 04, 19:41 - 2009 Jul 04, 19:57 UT * magnitude of target star: 10.6 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 6.6 * Moon: 94 % sunlit, 45° distance * Sun: 162° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 88 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .024", 80° ) * approx speed of asteroid's shadow [km/s]: 12.1507 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5746-00123-1 by 976 Benjamina on 2009 Jul 4 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 - 18 0 0 -23 38 39 19 57 7 1 103 -18 -23 14 6 -24 3 17 -22 50 7 -24 27 30 - 17 0 0 -23 51 51 19 57 7 2 103 -19 -23 27 18 -24 16 29 -23 3 19 -24 40 42 - 16 0 0 -24 5 2 19 57 6 3 102 -20 -23 40 29 -24 29 39 -23 16 29 -24 53 52 - 15 0 0 -24 18 11 19 57 6 3 102 -20 -23 53 38 -24 42 49 -23 29 39 -25 7 2 - 14 0 0 -24 31 19 19 57 5 4 102 -21 -24 6 46 -24 55 57 -23 42 47 -25 20 9 - 13 0 0 -24 44 25 19 57 4 5 101 -22 -24 19 52 -25 9 2 -23 55 53 -25 33 15 - 12 0 0 -24 57 28 19 57 3 6 101 -23 -24 32 55 -25 22 6 -24 8 57 -25 46 18 - 11 0 0 -25 10 30 19 57 2 7 100 -24 -24 45 57 -25 35 7 -24 21 58 -25 59 19 - 10 0 0 -25 23 28 19 57 1 8 100 -25 -24 58 56 -25 48 5 -24 34 57 -26 12 18 - 9 0 0 -25 36 24 19 57 0 9 99 -26 -25 11 51 -26 1 1 -24 47 53 -26 25 13 - 8 0 0 -25 49 16 19 56 58 10 99 -27 -25 24 44 -26 13 53 -25 0 46 -26 38 5 - 7 0 0 -26 2 5 19 56 57 11 98 -28 -25 37 33 -26 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30 32 -26 7 53 167 0 0 -25 6 5 19 41 13 8 260 0 -24 41 32 -25 30 42 -24 17 33 -25 54 54 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 5746-00123-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 55 11.9266 DE: -12 19 36.959 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .020 ) * V mag [mag]: 10.6 * B mag [mag]: 10.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (976) Benjamina approx. diameter [km]: 81 approx. diameter ["]: .050 distance from Earth [AU]: 2.23000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 894 number of rejected observations: 59 time covered by the observations: 1929 Jul 06 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.014, 74° remarks: * orbital elements for (976) Benjamina : Mean anomaly = 85.44334829 deg Arg. of pericenter = 312.55035058 deg Long. of node = 244.79966398 deg Inclination = 7.64834845 deg Eccentricity = 0.09567754 Semimajor axis = 3.20873703 AU Perihelion dist = 2.90173295 AU Mag: H = 9.37, G = 0.15 Epoch of elements : MJD 55016.82600000 TDT (2009 Jul 04.826) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 4 976 Benjamina 19h 49.1m UT 10.6 19 55 11.927-12 19 36.96TYC 5746-00123-1 10.9 13.9 81 6.6 2.230 -1.846 -0.09 78.5693 -12.327 -116.15 22.81 19.8185 0.00145 -0.40245 -6.85816 -0.02234 -0.00132 -0.00106 2000 84.2728542009 628.00000312.550351244.799664 7.6483480.09567754 3.2087370 2.9017330 9.2 5.00.15 RATE 1.7147580 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.024 80 1.49 0.025 0 54545.5020090704_0123-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org