IOTA/IOTA-ES occultation update for (190) Ismene / TYC 6234-02090-1 event on 2009 Jun 30, 16:42 UT Visible from Australia, Africa Summary ------- On 2009 Jun 30 UT, the 164 km diameter asteroid (190) Ismene will occult a 12.0 mag star in the constellation Serpens for observers along a path across Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 14.1 mag (the magnitude of the asteroid) for at most 10.8 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: 52 * date and approx. time of event: 2009 Jun 30, 16:35 - 2009 Jun 30, 16:48 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 10.8 * Moon: 62 % sunlit, 59° distance * Sun: 160° distance * rough path description: Australia, Africa The occultation path -------------------- * approximate projected width [km]: 170 * 1 sigma uncertainty interval [path widths]: +/- 1.23 * 1 sigma uncertainty interval [seconds]: +/- 12.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .076 +/- .076) * 1 sigma uncertainty ellipse (major, minor, PA): ( .076", .076", 0° ) * approx speed of asteroid's shadow [km/s]: 15.1736 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6234-02090-1 by 190 Ismene on 2009 Jun 30 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 10 0 0 -19 44 43 16 48 43 15 101 0 -18 56 56 -20 32 41 -17 0 7 -22 31 35 11 0 0 -20 0 25 16 48 41 16 101 -1 -19 12 39 -20 48 22 -17 15 52 -22 47 14 12 0 0 -20 16 0 16 48 39 17 100 -2 -19 28 15 -21 3 57 -17 31 31 -23 2 46 13 0 0 -20 31 30 16 48 37 18 100 -3 -19 43 46 -21 19 25 -17 47 4 -23 18 12 14 0 0 -20 46 53 16 48 34 19 100 -4 -19 59 10 -21 34 47 -18 2 31 -23 33 31 15 0 0 -21 2 9 16 48 32 20 99 -5 -20 14 27 -21 50 2 -18 17 51 -23 48 43 16 0 0 -21 17 18 16 48 29 21 99 -6 -20 29 37 -22 5 10 -18 33 4 -24 3 48 17 0 0 -21 32 20 16 48 27 22 99 -7 -20 44 40 -22 20 11 -18 48 10 -24 18 45 18 0 0 -21 47 14 16 48 24 23 98 -8 -20 59 36 -22 35 4 -19 3 9 -24 33 35 19 0 0 -22 2 0 16 48 21 24 98 -9 -21 14 24 -22 49 49 -19 18 0 -24 48 17 20 0 0 -22 16 39 16 48 18 25 97 -9 -21 29 3 -23 4 26 -19 32 43 -25 2 50 21 0 0 -22 31 9 16 48 15 26 97 -10 -21 43 35 -23 18 54 -19 47 17 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25 10 -21 0 51 -17 28 25 -22 59 41 169 0 0 -19 57 19 16 35 50 17 260 -37 -19 9 33 -20 45 16 -17 12 46 -22 44 8 170 0 0 -19 41 37 16 35 47 16 259 -36 -18 53 50 -20 29 35 -16 57 1 -22 28 29 171 0 0 -19 25 49 16 35 45 15 259 -35 -18 38 1 -20 13 48 -16 41 10 -22 12 44 172 0 0 -19 9 56 16 35 43 15 259 -34 -18 22 7 -19 57 56 -16 25 15 -21 56 54 173 0 0 -18 53 58 16 35 42 14 258 -33 -18 6 9 -19 41 59 -16 9 14 -21 40 59 174 0 0 -18 37 55 16 35 40 13 258 -32 -17 50 5 -19 25 57 -15 53 9 -21 24 58 175 0 0 -18 21 48 16 35 38 12 258 -31 -17 33 58 -19 9 50 -15 37 0 -21 8 53 176 0 0 -18 5 37 16 35 37 11 257 -30 -17 17 46 -18 53 40 -15 20 47 -20 52 44 177 0 0 -17 49 22 16 35 36 10 257 -29 -17 1 30 -18 37 25 -15 4 30 -20 36 31 178 0 0 -17 33 3 16 35 34 9 257 -28 -16 45 11 -18 21 7 -14 48 10 -20 20 14 179 0 0 -17 16 42 16 35 33 8 256 -27 -16 28 49 -18 4 46 -14 31 47 -20 3 53 180 0 0 -17 0 17 16 35 32 7 256 -26 -16 12 25 -17 48 21 -14 15 22 -19 47 30 -179 0 0 -16 43 50 16 35 32 6 256 -25 -15 55 57 -17 31 55 -13 58 54 -19 31 4 -178 0 0 -16 27 21 16 35 31 5 255 -24 -15 39 28 -17 15 26 -13 42 25 -19 14 35 -177 0 0 -16 10 50 16 35 30 4 255 -23 -15 22 57 -16 58 55 -13 25 53 -18 58 4 -176 0 0 -15 54 18 16 35 30 3 255 -22 -15 6 25 -16 42 22 -13 9 21 -18 41 32 -175 0 0 -15 37 44 16 35 30 2 255 -21 -14 49 51 -16 25 49 -12 52 47 -18 24 58 -174 0 0 -15 21 10 16 35 29 1 254 -20 -14 33 17 -16 9 14 .. .. .. -18 8 23 Uncertainty in time = +/- 13 secs Prediction of 2009 Jun 24.0 Data for the target star ------------------------ * name: TYC 6234-02090-1 * constellation : Serpens * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 20 15.8441 DE: -15 18 19.007 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .074, .075 ) * V mag [mag]: 12.0 * B mag [mag]: 13.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (190) Ismene approx. diameter [km]: 164 approx. diameter ["]: .062 distance from Earth [AU]: 3.66300 * orbital information: orbit source: Preston date of fit: 2009 Jun 24 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 860 number of rejected observations: 144 time covered by the observations: 1907 Jun 20 - 2009 Jun 03 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.016, 93° remarks: * orbital elements for (190) Ismene : Mean anomaly = 171.41161642 deg Arg. of pericenter = 274.64834787 deg Long. of node = 175.97139148 deg Inclination = 6.16604026 deg Eccentricity = 0.16488121 Semimajor axis = 3.98046623 AU Perihelion dist = 3.32416214 AU Mag: H = 7.43, G = 0.15 Epoch of elements : MJD 55012.69600000 TDT (2009 Jun 30.696) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 30 190 Ismene 16h 42.2m UT 12.0 17 20 15.844-15 18 19.01TYC 6234-02090-1 13.0 14.1 164 10.8 3.663 -1.421 -0.08 90.6276 -15.305 -69.62 23.13 16.7037 0.00194 -0.27325 -8.56432 -0.03409 0.00181 -0.00086 2000 171.0770182009 628.00000274.648348175.971391 6.1660400.16488121 3.9804662 3.3241621 7.6 5.00.15 RATE 1.2410900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.076 0.076 0 2.23 0.076 0 55006.0020090630_2090-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 24, 16:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org