IOTA/IOTA-ES occultation update for (734) Benda / TYC 6376-00074-1 event on 2012 Sep 17, 00:23 UT Visible from Africa, Brazil, Argentina, Chile Summary ------- On 2012 Sep 17 UT, the 73 km diameter asteroid (734) Benda will occult a 11.2 mag star in the constellation Capricornus for observers along a path across Africa, Brazil, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 14.7 mag (the magnitude of the asteroid) for at most 7.5 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: 72 * date and approx. time of event: 2012 Sep 17, 00:12 - 2012 Sep 17, 00:32 UT * geocentric midpoint of event [JD]: 2456187.51614167 * magnitude of target star: 11.2 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 7.5 * Moon: 1 % sunlit, 137° distance * Sun: 150° distance * rough path description: Africa, Brazil, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.80 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .036", 77° ) * approx speed of asteroid's shadow [km/s]: 9.7273 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6376-00074-1 by 734 Benda on 2012 Sep 17 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 -100 0 0 -18 41 4 0 32 45 29 99 0 -18 20 46 -19 1 23 -17 48 18 -19 33 54 - 99 0 0 -18 53 13 0 32 39 30 99 -1 -18 32 55 -19 13 31 -18 0 29 -19 46 0 - 98 0 0 -19 5 6 0 32 34 31 99 -2 -18 44 50 -19 25 23 -18 12 25 -19 57 51 - 97 0 0 -19 16 44 0 32 28 32 98 -3 -18 56 29 -19 37 0 -18 24 6 -20 9 27 - 96 0 0 -19 28 7 0 32 22 33 98 -4 -19 7 53 -19 48 22 -18 35 31 -20 20 47 - 95 0 0 -19 39 14 0 32 17 34 98 -5 -19 19 1 -19 59 28 -18 46 41 -20 31 51 - 94 0 0 -19 50 5 0 32 11 35 97 -6 -19 29 53 -20 10 18 -18 57 35 -20 42 40 - 93 0 0 -20 0 41 0 32 4 36 97 -7 -19 40 30 -20 20 53 -19 8 13 -20 53 14 - 92 0 0 -20 11 1 0 31 58 37 97 -8 -19 50 51 -20 31 12 -19 18 36 -21 3 31 - 91 0 0 -20 21 6 0 31 52 37 96 -9 -20 0 56 -20 41 16 -19 28 42 -21 13 33 - 90 0 0 -20 30 54 0 31 45 38 96 -9 -20 10 45 -20 51 3 -19 38 33 -21 23 19 - 89 0 0 -20 40 26 0 31 38 39 95 -10 -20 20 19 -21 0 34 -19 48 8 -21 32 49 - 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1 54 19 0 12 31 10 253 -36 - 1 33 29 - 2 15 10 - 1 0 11 - 2 48 32 51 0 0 - 1 35 14 0 12 29 8 253 -35 - 1 14 25 - 1 56 4 - 0 41 6 - 2 29 26 52 0 0 - 1 16 12 0 12 28 7 253 -34 - 0 55 23 - 1 37 2 - 0 22 6 - 2 10 23 53 0 0 - 0 57 15 0 12 26 6 253 -33 - 0 36 26 - 1 18 4 - 0 3 9 - 1 51 25 54 0 0 - 0 38 21 0 12 25 5 253 -32 - 0 17 33 - 0 59 10 0 15 43 - 1 32 30 55 0 0 - 0 19 33 0 12 24 4 253 -31 0 1 15 - 0 40 21 0 34 30 - 1 13 40 56 0 0 - 0 0 49 0 12 23 3 253 -30 0 19 58 - 0 21 37 0 53 12 - 0 54 55 57 0 0 0 17 48 0 12 23 2 253 -29 0 38 35 - 0 2 59 1 11 49 - 0 36 16 58 0 0 0 36 20 0 12 22 1 253 -27 0 57 6 0 15 33 1 30 19 - 0 17 43 59 0 0 0 54 46 0 12 22 0 253 -26 1 15 31 0 33 59 .. .. .. 0 0 44 Uncertainty in time = +/- 6 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 6376-00074-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 54 40.4764 DE: -16 57 52.862 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .033 ) * V mag [mag]: 11.2 * B mag [mag]: 11.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (734) Benda approx. diameter [km]: 73 approx. diameter ["]: .045 distance from Earth [AU]: 2.24300 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1110 number of rejected observations: 70 time covered by the observations: 1920 Feb 23 - 2012 Aug 06 1 sigma uncertainty ellipse (major, minor, PA): 0.028, 0.016, 66° remarks: * orbital elements for (734) Benda : Mean anomaly = 273.78087219 deg Arg. of pericenter = 67.86135700 deg Long. of node = 3.29020206 deg Inclination = 5.79894089 deg Eccentricity = 0.09670272 Semimajor axis = 3.14726397 AU Perihelion dist = 2.84291500 AU Mag: H = 9.87, G = 0.15 Epoch of elements : MJD 56187.01600000 TDT (2012 Sep 17.016) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 17 734 Benda 0h 23.2m UT 11.2 21 54 40.476-16 57 52.86TYC 6376-00074-1 11.8 14.7 73 7.5 2.243 -1.490 -2.33 -33.4913 -16.964 172.82 2.17 0.3874 0.01042 -0.09080 -5.45794 -0.59589 0.00256 0.00131 2000 272.5423782012 910.00000 67.861357 3.290202 5.7989410.09670272 3.1472640 2.8429150 9.8 5.00.15 RATE 1.7652420 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.036 77 1.80 0.036 0 0 4-2 056165.0020120917_0074-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org