IOTA/IOTA-ES occultation update for (82) Alkmene / UCAC2 20721742 event on 2009 Jul 06, 15:50 UT Visible from Summary ------- On 2009 Jul 06 UT, the 61 km diameter asteroid (82) Alkmene will occult a 10.9 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 2.1 mag to 12.8 mag (the magnitude of the asteroid) for at most 4.3 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 58 * date and approx. time of event: 2009 Jul 06, 15:43 - 2009 Jul 06, 15:57 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 4.3 * Moon: 99 % sunlit, 4° distance * Sun: 174° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 63 * 1 sigma uncertainty interval [path widths]: +/- 1.07 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .046", .041", 89° ) * approx speed of asteroid's shadow [km/s]: 14.1558 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 20721742 by 82 Alkmene on 2009 Jul 6 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 23 0 0 -21 1 58 15 57 54 5 117 0 -20 42 31 -21 21 28 -20 0 58 -22 3 18 24 0 0 -21 32 18 15 57 53 7 116 -1 -21 12 52 -21 51 47 -20 31 21 -22 33 36 25 0 0 -22 2 26 15 57 52 8 116 -2 -21 43 0 -22 21 54 -21 1 32 -23 3 41 26 0 0 -22 32 21 15 57 51 9 116 -4 -22 12 57 -22 51 48 -21 31 30 -23 33 33 27 0 0 -23 2 3 15 57 50 10 115 -5 -22 42 39 -23 21 29 -22 1 15 -24 3 11 28 0 0 -23 31 30 15 57 48 11 115 -6 -23 12 8 -23 50 55 -22 30 46 -24 32 35 29 0 0 -24 0 43 15 57 46 12 115 -7 -23 41 21 -24 20 6 -23 0 2 -25 1 43 30 0 0 -24 29 40 15 57 45 13 114 -8 -24 10 20 -24 49 2 -23 29 4 -25 30 36 31 0 0 -24 58 21 15 57 43 14 114 -9 -24 39 2 -25 17 41 -23 57 49 -25 59 12 32 0 0 -25 26 45 15 57 41 15 113 -10 -25 7 28 -25 46 4 -24 26 18 -26 27 32 33 0 0 -25 54 52 15 57 39 16 113 -11 -25 35 36 -26 14 9 -24 54 29 -26 55 34 34 0 0 -26 22 41 15 57 36 17 112 -12 -26 3 27 -26 41 57 -25 22 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2 -15 55 59 -14 35 31 -16 37 48 -153 0 0 -15 5 9 15 43 38 10 245 -13 -14 45 42 -15 24 38 -14 4 11 -16 6 27 -152 0 0 -14 33 47 15 43 37 9 244 -12 -14 14 20 -14 53 15 -13 32 51 -15 35 3 -151 0 0 -14 2 24 15 43 35 8 244 -11 -13 42 58 -14 21 52 -13 1 30 -15 3 39 -150 0 0 -13 31 2 15 43 34 7 244 -10 -13 11 37 -13 50 29 -12 30 9 -14 32 14 -149 0 0 -12 59 41 15 43 33 6 244 -9 -12 40 16 -13 19 7 -11 58 51 -14 0 51 -148 0 0 -12 28 21 15 43 32 5 243 -8 -12 8 58 -12 47 47 -11 27 34 -13 29 29 -147 0 0 -11 57 5 15 43 31 4 243 -7 -11 37 42 -12 16 30 -10 56 20 -12 58 9 -146 0 0 -11 25 52 15 43 31 3 243 -6 -11 6 31 -11 45 16 -10 25 11 -12 26 53 -145 0 0 -10 54 45 15 43 31 2 243 -4 -10 35 24 -11 14 7 - 9 54 7 -11 55 42 -144 0 0 -10 23 43 15 43 30 0 243 -3 -10 4 23 -10 43 4 .. .. .. -11 24 36 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 20721742 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 46 37.3924 DE: -27 02 09.885 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .042, .039 ) * V mag [mag]: 10.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (82) Alkmene approx. diameter [km]: 61 approx. diameter ["]: .038 distance from Earth [AU]: 2.20300 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1083 number of rejected observations: 126 time covered by the observations: 1905 Nov 06 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.012, 85° remarks: * orbital elements for (82) Alkmene : Mean anomaly = 128.92353535 deg Arg. of pericenter = 110.49146033 deg Long. of node = 25.60828606 deg Inclination = 2.83251478 deg Eccentricity = 0.22359979 Semimajor axis = 2.76055336 AU Perihelion dist = 2.14329420 AU Mag: H = 8.21, G = 0.28 Epoch of elements : MJD 55018.66000000 TDT (2009 Jul 06.660) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 6 82 Alkmene 15h 50.7m UT 10.9 18 46 37.392-27 2 9.89UCAC2 20721742 0.0 12.8 61 4.3 2.203 -2.379 -2.56 119.2127 -27.036 -56.47 22.63 15.8454 0.02213 -0.27459 -7.96398 -0.64308 0.00038 0.00043 2000 127.0626152009 628.00000110.491460 25.608286 2.8325150.22359979 2.7605534 2.1432942 8.4 5.00.28 RATE 2.1488680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.046 0.041 89 2.07 0.041 0 54545.5020090706_721742 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org