IOTA/IOTA-ES occultation update for (216) Kleopatra / 2UCAC 27316698 event on 2007 Oct 01, 01:12 UT Visible from Chile, Bolivia Summary ------- On 2007 Oct 01 UT, the 135 km diameter asteroid (216) Kleopatra will occult a 11.3 mag star in the constellation Ophiuchus for observers along a path across Chile, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.1 mag (the magnitude of the asteroid) for at most 5.0 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: 96 * date and approx. time of event: 2007 Oct 01, 01:08 - 2007 Oct 01, 01:16 UT * midpoint of event [JD]: 2454374.55025833 * magnitude of target star: 11.3 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 5.0 * Moon: 75 % sunlit, 164° distance * Sun: 64° distance * rough path description: Chile, Bolivia The occultation path -------------------- * approximate projected width [km]: 136 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .022", 359° ) * approx speed of asteroid's shadow [km/s]: 27.1738 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 27316698 by 216 Kleopatra on 2007 Oct 01 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 136 0 0 3 38 55 1 8 30 0 103 65 3 1 2 4 16 45 2 29 56 4 47 44 137 0 0 3 25 11 1 8 30 1 103 66 2 47 16 4 3 2 2 16 8 4 34 2 138 0 0 3 11 14 1 8 30 2 103 67 2 33 17 3 49 7 2 2 8 4 20 8 139 0 0 2 57 4 1 8 30 3 103 68 2 19 5 3 34 59 1 47 55 4 6 2 140 0 0 2 42 41 1 8 30 5 103 69 2 4 41 3 20 38 1 33 29 3 51 43 141 0 0 2 28 7 1 8 31 6 103 70 1 50 5 3 6 5 1 18 52 3 37 11 142 0 0 2 13 21 1 8 31 7 103 71 1 35 17 2 51 21 1 4 2 3 22 28 143 0 0 1 58 23 1 8 32 8 103 72 1 20 18 2 36 25 0 49 1 3 7 33 144 0 0 1 43 14 1 8 32 9 103 73 1 5 7 2 21 17 0 33 49 2 52 27 145 0 0 1 27 53 1 8 33 10 103 74 0 49 45 2 5 59 0 18 26 2 37 10 146 0 0 1 12 22 1 8 34 11 103 75 0 34 12 1 50 29 0 2 52 2 21 42 147 0 0 0 56 41 1 8 35 12 103 76 0 18 29 1 34 49 - 0 12 53 2 6 3 148 0 0 0 40 49 1 8 35 13 103 77 0 2 36 1 18 59 - 0 28 47 1 50 14 149 0 0 0 24 48 1 8 36 14 103 78 - 0 13 27 1 2 59 - 0 44 52 1 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Data for the target star ------------------------ * name: 2UCAC 27316698 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 44 43.5136 DE: -12 37 26.031 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .022 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 251.2888237076 DE(deg): -12.6391300394 * Equation of equinoxes (radians) : 0.000028557177920 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (216) Kleopatra approx. diameter [km]: 135 approx. diameter ["]: .055 distance from Earth [AU]: 3.36900 * orbital information: orbit source: Preston date of fit: 2007 Aug 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1579 number of rejected observations: 169 time covered by the observations: 1905 Aug 03 - 2007 Jul 11 1 sigma uncertainty ellipse (major, minor, PA): 0.007, 0.006, 82° remarks: * orbital elements for (216) Kleopatra : Mean anomaly = 259.93630414 deg Arg. of pericenter = 179.63912004 deg Long. of node = 215.58225667 deg Inclination = 13.10020064 deg Eccentricity = 0.24855435 Semimajor axis = 2.79887241 AU Perihelion dist = 2.10320049 AU Mag: H = 7.07, G = 0.29 Epoch of elements : MJD 54374.05000000 TDT (2007 Oct 01.050) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 01 216 Kleopatra 1h 12.4m UT 11.3 16 44 43.514-12 37 26.032UCAC 27316698 0.0 13.1 135 5.0 3.369 2.686 -7.54 223.689 -12.622 159.39 -2.97 1.2062 -.02405 -.12052 15.06270 -2.89109 0.00522 -0.00027 2000 259.0838232007 927.00000179.639120215.582257 13.1002010.248554352.798872412.103200497.305 0.29 RATE 2.1048900 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.023 0.022 359.4 1.410 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 03, 05:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org