IOTA/IOTA-ES occultation update for (5192) Yabuki / TYC 2493-01415-1 event on 2008 Feb 04, 19:28 UT Visible from E Russia, Japan Summary ------- On 2008 Feb 04 UT, the 36 km diameter asteroid (5192) Yabuki will occult a 11.2 mag star in the constellation Leo for observers along a path across E Russia, Japan. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.9 mag to 15.1 mag (the magnitude of the asteroid) for at most 2.5 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: 24 * date and approx. time of event: 2008 Feb 04, 19:22 - 2008 Feb 04, 19:34 UT * midpoint of event [JD]: 2454501.31130833 * magnitude of target star: 11.2 * magnitude drop [mag]: 3.9 * estimated maximum duration [s]: 2.5 * Moon: 6 % sunlit, 152° distance * Sun: 165° distance * rough path description: E Russia, Japan The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 2.75 * 1 sigma uncertainty interval [seconds]: +/- 8.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .085 +/- .057) * 1 sigma uncertainty ellipse (major, minor, PA): ( .086", .056", 97° ) * approx speed of asteroid's shadow [km/s]: 14.2860 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2493-01415-1 by 5192 Yabuki on 2008 Feb 04 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 167 32 6 6 0 0 19 22 16 2 301 3 167 54 46 167 9 36 ... .. .. ... .. .. 165 57 59 7 0 0 19 22 17 3 301 1 166 20 0 165 36 8 168 24 5 ... .. .. Latitude Latitude Latitude Latitude 164 0 0 8 18 44 19 22 19 6 300 -1 8 33 16 8 4 15 9 54 9 .. .. .. 163 0 0 9 0 16 19 22 20 7 300 -2 9 14 55 8 45 40 10 36 30 .. .. .. 162 0 0 9 42 47 19 22 22 8 300 -4 9 57 34 9 28 4 11 19 52 .. .. .. 161 0 0 10 26 18 19 22 23 9 300 -5 10 41 13 10 11 27 12 4 15 8 50 45 160 0 0 11 10 48 19 22 26 11 300 -6 11 25 51 10 55 50 12 49 39 9 34 26 159 0 0 11 56 17 19 22 28 12 299 -7 12 11 28 11 41 10 13 36 2 10 19 5 158 0 0 12 42 44 19 22 30 13 299 -8 12 58 3 12 27 29 14 23 24 11 4 40 157 0 0 13 30 8 19 22 33 14 299 -9 13 45 35 13 14 45 15 11 45 11 51 12 156 0 0 14 18 29 19 22 36 15 299 -10 14 34 5 14 2 57 16 1 4 12 38 39 155 0 0 15 7 45 19 22 40 17 298 -11 15 23 30 14 52 5 16 51 20 13 27 1 154 0 0 15 57 56 19 22 43 18 298 -13 16 13 50 15 42 7 17 42 32 14 16 16 153 0 0 16 49 1 19 22 47 19 297 -14 17 5 4 16 33 2 18 34 38 15 6 24 152 0 0 17 40 58 19 22 51 20 297 -15 17 57 10 17 24 50 19 27 38 15 57 23 151 0 0 18 33 46 19 22 56 22 297 -16 18 50 7 18 17 29 20 21 30 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22 54 54 40 25 57 23 29 .. .. .. - 64 0 0 54 10 7 19 34 16 3 36 10 54 31 29 53 48 55 56 32 18 .. .. .. - 65 0 0 53 17 26 19 34 17 2 35 11 53 38 49 52 56 13 55 39 47 .. .. .. - 66 0 0 52 23 34 19 34 17 0 34 12 52 44 58 52 2 20 54 46 0 .. .. .. - 67 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 53 50 58 .. .. .. - 68 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 52 54 43 .. .. .. Data for the target star ------------------------ * name: TYC 2493-01415-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 22 29.8829 DE: +30 49 45.283 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .019 ) * V mag [mag]: 11.2 * B mag [mag]: 12.1 * Apparent position with proper motion RA(deg): 140.7556846621 DE(deg): 30.7930512338 * Equation of equinoxes (radians) : 0.000045956410794 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5192) Yabuki approx. diameter [km]: 36 approx. diameter ["]: .022 distance from Earth [AU]: 2.25000 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 606 number of rejected observations: 18 time covered by the observations: 1963 Mar 28 - 2007 Nov 17 1 sigma uncertainty ellipse (major, minor, PA): 0.084, 0.053, 97° remarks: * orbital elements for (5192) Yabuki : Mean anomaly = 89.44110977 deg Arg. of pericenter = 304.68472080 deg Long. of node = 91.24485074 deg Inclination = 14.90131931 deg Eccentricity = 0.08352844 Semimajor axis = 3.19370638 AU Perihelion dist = 2.92694106 AU Mag: H = 10.57, G = 0.15 Epoch of elements : MJD 54500.81100000 TDT (2008 Feb 04.811) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 04 5192 Yabuki 19h 28.3m UT 11.2 9 22 29.883 30 49 45.28TYC 2493-01415-1 12.1 15.1 36 2.5 2.250 -2.117 15.79 74.213 30.825 251.41 -16.23 19.4714 .29481 .50923 -6.97745 4.04150 -0.00031 -0.00151 2000 89.30106022008 2 4.00000304.684721 91.244851 14.9013190.083528443.193706382.9269410610.45 0.15 RATE 1.7268778 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.086 0.056 96.7 3.750 0.060 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 04, 04:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org