IOTA/IOTA-ES occultation update for (210) Isabella / HIP 58888 event on 2007 Jul 01, 00:14 UT Visible from Chile, Bolivia, Brazil Summary ------- On 2007 Jul 01 UT, the 87 km diameter asteroid (210) Isabella will occult a 9.4 mag star in the constellation Virgo for observers along a path across Chile, Bolivia, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 15.1 mag (the magnitude of the asteroid) for at most 4.4 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: Hipparcos . The event at a glimpse ---------------------- * Rank: 95 * date and approx. time of event: 2007 Jul 01, 00:08 - 2007 Jul 01, 00:19 UT * magnitude of target star: 9.4 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 4.4 * Moon: 100 % sunlit, 103° distance * Sun: 82° distance * rough path description: Chile, Bolivia, Brazil Additional comments ------------------- close double star. The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 0.44 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .016) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .016", 97° ) * approx speed of asteroid's shadow [km/s]: 19.6368 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 58888 by 210 Isabella on 2007 Jul 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 170 0 0 26 25 39 0 8 56 0 89 81 .. .. .. 26 49 14 .. .. .. 27 9 58 171 0 0 26 26 10 0 8 56 1 90 82 26 2 35 26 49 45 25 41 49 27 10 29 172 0 0 26 26 14 0 8 56 2 90 83 26 2 39 26 49 49 25 41 53 27 10 33 173 0 0 26 25 50 0 8 57 3 91 84 26 2 15 26 49 25 25 41 29 27 10 10 174 0 0 26 24 59 0 8 57 4 91 84 26 1 24 26 48 34 25 40 37 27 9 19 175 0 0 26 23 40 0 8 57 4 91 85 26 0 4 26 47 16 25 39 18 27 8 1 176 0 0 26 21 54 0 8 58 5 92 86 25 58 18 26 45 30 25 37 31 27 6 15 177 0 0 26 19 40 0 8 58 6 92 86 25 56 3 26 43 16 25 35 16 27 4 2 178 0 0 26 16 58 0 8 59 7 93 86 25 53 20 26 40 35 25 32 32 27 1 21 179 0 0 26 13 48 0 8 59 8 93 86 25 50 10 26 37 26 25 29 21 26 58 13 180 0 0 26 10 10 0 9 0 9 94 86 25 46 31 26 33 49 25 25 42 26 54 37 -179 0 0 26 6 5 0 9 1 10 94 86 25 42 25 26 29 44 25 21 35 26 50 33 -178 0 0 26 1 32 0 9 2 11 94 85 25 37 51 26 25 12 25 17 0 26 46 2 -177 0 0 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-30 55 39 -32 4 1 -30 34 46 - 24 0 0 -31 25 16 0 19 40 10 277 -70 -31 48 59 -31 1 34 -32 9 51 -30 40 42 - 23 0 0 -31 30 43 0 19 41 9 276 -71 -31 54 24 -31 7 1 -32 15 16 -30 46 11 - 22 0 0 -31 35 43 0 19 41 8 276 -72 -31 59 23 -31 12 2 -32 20 13 -30 51 13 - 21 0 0 -31 40 16 0 19 42 7 275 -73 -32 3 55 -31 16 37 -32 24 45 -30 55 49 - 20 0 0 -31 44 23 0 19 43 6 275 -73 -32 8 1 -31 20 45 -32 28 50 -30 59 57 - 19 0 0 -31 48 4 0 19 43 5 274 -74 -32 11 41 -31 24 26 -32 32 29 -31 3 40 - 18 0 0 -31 51 18 0 19 44 4 274 -75 -32 14 55 -31 27 42 -32 35 42 -31 6 55 - 17 0 0 -31 54 6 0 19 44 4 273 -75 -32 17 42 -31 30 30 -32 38 29 -31 9 45 - 16 0 0 -31 56 28 0 19 44 3 273 -76 -32 20 3 -31 32 53 -32 40 49 -31 12 8 - 15 0 0 -31 58 23 0 19 44 2 272 -77 -32 21 58 -31 34 49 -32 42 44 -31 14 4 - 14 0 0 -31 59 53 0 19 44 1 271 -77 -32 23 28 -31 36 18 -32 44 13 -31 15 34 - 13 0 0 -32 0 56 0 19 44 0 271 -78 -32 24 31 -31 37 22 -32 45 16 -31 16 38 Data for the target star ------------------------ * name: HIP 58888 * constellation : Virgo * J2000 position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 12 04 39.4648 DE: +00 45 34.600 * position source: Hipparcos * standard error: RA,DE ["]: ( .023, .012 ) * V mag [mag]: 9.4 * B mag [mag]: 9.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (210) Isabella approx. diameter [km]: 87 approx. diameter ["]: .040 distance from Earth [AU]: 2.98100 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 848 number of rejected observations: 72 time covered by the observations: 1915 Nov 02 - 2007 May 22 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.010, 120° remarks: * orbital elements for (210) Isabella : Mean anomaly = 146.78909716 deg Arg. of pericenter = 13.72041386 deg Long. of node = 32.85338139 deg Inclination = 5.26119207 deg Eccentricity = 0.12407690 Semimajor axis = 2.72079455 AU Perihelion dist = 2.38320679 AU Mag: H = 9.36, G = 0.15 Epoch of elements : MJD 54282.01000000 TDT (2007 Jul 01.010) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 01 210 Isabella 0h 14.3m UT 9.4 12 4 39.465 0 45 34.60HIP 58888 9.8 15.1 87 4.4 2.981 1.906 -15.88 -101.099 0.764 -182.66 23.14 0.2389 -.02450 -.04195 9.68807 -5.38390 0.00507 -0.00218 2000 146.3476722007 629.00000 13.720414 32.853381 5.2611920.124076902.720794552.383206799.335 0.15 RATE 2.1961420 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.026 0.016 97.1 1.440 0.018 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 01:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org