IOTA/IOTA-ES occultation update for (206) Hersilia / 2UCAC 38248903 event on 2008 Feb 01, 16:28 UT Visible from Australia, Indonesia, India, Africa Summary ------- On 2008 Feb 01 UT, the 105 km diameter asteroid (206) Hersilia will occult a 12.3 mag star in the constellation Cancer for observers along a path across Australia, Indonesia, India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.4 mag (the magnitude of the asteroid) for at most 9.7 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: 2008 Feb 01, 16:18 - 2008 Feb 01, 16:37 UT * magnitude of target star: 12.3 * magnitude drop [mag]: 0.8 * estimated maximum duration [s]: 9.7 * Moon: 27 % sunlit, 131° distance * Sun: 165° distance * rough path description: Australia, Indonesia, India, Africa The occultation path -------------------- * approximate projected width [km]: 108 * 1 sigma uncertainty interval [path widths]: +/- 0.30 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .024", 92° ) * approx speed of asteroid's shadow [km/s]: 10.8695 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 38248903 by 206 Hersilia on 2008 Feb 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 8 0 0 4 12 32 16 37 0 1 72 14 4 43 31 3 41 27 5 2 5 3 22 46 9 0 0 4 32 9 16 37 0 2 72 13 5 3 5 4 1 9 5 21 36 3 42 30 10 0 0 4 51 21 16 37 0 3 72 12 5 22 13 4 20 25 5 40 42 4 1 49 11 0 0 5 10 8 16 36 59 4 72 11 5 40 56 4 39 15 5 59 23 4 20 41 12 0 0 5 28 29 16 36 58 5 72 10 5 59 14 4 57 40 6 17 38 4 39 9 13 0 0 5 46 24 16 36 57 6 72 9 6 17 5 5 15 39 6 35 27 4 57 10 14 0 0 6 3 54 16 36 56 7 72 8 6 34 31 5 33 12 6 52 51 5 14 45 15 0 0 6 20 57 16 36 55 8 72 7 6 51 30 5 50 19 7 9 48 5 31 54 16 0 0 6 37 34 16 36 53 9 72 6 7 8 4 6 7 0 7 26 20 5 48 37 17 0 0 6 53 45 16 36 51 10 72 5 7 24 11 6 23 14 7 42 25 6 4 53 18 0 0 7 9 29 16 36 49 11 73 4 7 39 52 6 39 1 7 58 4 6 20 43 19 0 0 7 24 47 16 36 47 12 73 3 7 55 6 6 54 23 8 13 16 6 36 6 20 0 0 7 39 38 16 36 45 13 73 2 8 9 54 7 9 17 8 28 2 6 51 2 21 0 0 7 54 3 16 36 42 14 73 1 8 24 16 7 23 45 8 42 22 7 5 32 22 0 0 8 8 1 16 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Data for the target star ------------------------ * name: 2UCAC 38248903 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 56 06.6568 DE: +18 26 44.679 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .040, .019 ) * V mag [mag]: 12.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (206) Hersilia approx. diameter [km]: 105 approx. diameter ["]: .086 distance from Earth [AU]: 1.68400 * orbital information: orbit source: Preston date of fit: 2008 Jan 17 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 803 number of rejected observations: 141 time covered by the observations: 1902 Nov 21 - 2007 Dec 15 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.015, 98° remarks: * orbital elements for (206) Hersilia : Mean anomaly = 33.19542342 deg Arg. of pericenter = 301.64891963 deg Long. of node = 145.26770797 deg Inclination = 3.78042030 deg Eccentricity = 0.04083974 Semimajor axis = 2.74068530 AU Perihelion dist = 2.62875643 AU Mag: H = 8.63, G = 0.15 Epoch of elements : MJD 54497.68600000 TDT (2008 Feb 01.686) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 01 206 Hersilia 16h 27.5m UT 12.3 7 56 6.657 18 26 44.682UCAC 38248903 0.0 12.4 105 9.7 1.684 -2.137 10.08 100.885 18.443 296.51 -17.14 16.4588 -.07742 -.23235 -5.82329 1.93085 0.00148 -0.00006 2000 31.52581042008 125.00000301.648920145.267708 3.7804200.040839742.740685302.628756438.685 0.15 RATE 2.1722776 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.048 0.024 92.4 1.300 0.026 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 17, 18:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org