IOTA/IOTA-ES occultation update for (185) Eunike / TYC 6405-00781-1 event on 2007 Sep 23, 15:32 UT Visible from Australia, Antarctica Summary ------- On 2007 Sep 23 UT, the 158 km diameter asteroid (185) Eunike will occult a 9.8 mag star in the constellation Cetus for observers along a path across Australia, Antarctica. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 10.8 mag (the magnitude of the asteroid) for at most 12.7 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: 99 * date and approx. time of event: 2007 Sep 23, 15:24 - 2007 Sep 23, 15:40 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 12.7 * Moon: 87 % sunlit, 38° distance * Sun: 163° distance * rough path description: Australia, Antarctica The occultation path -------------------- * approximate projected width [km]: 166 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .023", 90° ) * approx speed of asteroid's shadow [km/s]: 12.4735 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6405-00781-1 by 185 Eunike on 2007 Sep 23 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 ' " Longitude Longitude Longitude Longitude ... .. .. 37 0 0 .. .. .. .. .. .. -158 1 53 ... .. .. -158 53 27 ... .. .. -158 36 26 36 0 0 15 24 14 2 248 -13 -160 51 49 ... .. .. -161 38 12 ... .. .. -161 20 1 35 0 0 15 24 15 4 246 -15 -163 23 3 -159 8 29 -164 5 34 -158 18 37 Latitude Latitude Latitude Latitude -163 0 0 34 19 41 15 24 16 6 245 -17 35 9 33 33 29 33 35 27 27 33 11 26 -164 0 0 33 54 6 15 24 17 7 244 -17 34 44 21 33 3 36 35 2 23 32 45 21 -165 0 0 33 27 28 15 24 18 8 244 -18 34 18 6 32 36 34 34 36 16 32 18 11 -166 0 0 32 59 44 15 24 19 9 243 -19 33 50 46 32 8 26 34 9 5 31 49 54 -167 0 0 32 30 54 15 24 21 9 243 -20 33 22 21 31 39 10 33 40 49 31 20 29 -168 0 0 32 0 55 15 24 22 10 242 -21 32 52 48 31 8 46 33 11 25 30 49 55 -169 0 0 31 29 47 15 24 24 11 242 -22 32 22 7 30 37 10 32 40 54 30 18 9 -170 0 0 30 57 28 15 24 26 12 241 -23 31 50 15 30 4 23 32 9 12 29 45 11 -171 0 0 30 23 55 15 24 28 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.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -67 52 23 Data for the target star ------------------------ * name: TYC 6405-00781-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 57 57.2617 DE: -17 01 15.823 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .020 ) * V mag [mag]: 9.8 * B mag [mag]: 10.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (185) Eunike approx. diameter [km]: 158 approx. diameter ["]: .152 distance from Earth [AU]: 1.43100 * orbital information: orbit source: Preston date of fit: 2007 Sep 11 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1227 number of rejected observations: 143 time covered by the observations: 1905 Mar 13 - 2007 Sep 10 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.013, 89° remarks: * orbital elements for (185) Eunike : Mean anomaly = 344.03584833 deg Arg. of pericenter = 224.24064935 deg Long. of node = 153.93752089 deg Inclination = 23.22303538 deg Eccentricity = 0.12726729 Semimajor axis = 2.73891461 AU Perihelion dist = 2.39034037 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 54366.64700000 TDT (2007 Sep 23.647) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 23 185 Eunike 15h 32.3m UT 9.8 23 57 57.262-17 1 15.82TYC 6405-00781-1 10.4 10.8 158 12.7 1.431 -1.676 -35.98 124.304 -17.011 -54.97 -0.09 15.5388 .25413 -.17015 -3.91039 -5.85458 0.00008 0.00163 2000 342.5905342007 917.00000224.240649153.937521 23.2230350.127267292.738914612.390340377.625 0.15 RATE 2.1743850 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.030 0.023 89.5 1.180 0.028 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 12, 01:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org