IOTA/IOTA-ES occultation update for (98) Ianthe / TYC 1778-01327-1 event on 2007 Oct 01, 01:43 UT Visible from Russia, Scandanavia, NE Canada Summary ------- On 2007 Oct 01 UT, the 104 km diameter asteroid (98) Ianthe will occult a 11.6 mag star in the constellation Triangulum for observers along a path across Russia, Scandanavia, NE Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.4 mag (the magnitude of the asteroid) for at most 10.2 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: 99 * date and approx. time of event: 2007 Oct 01, 01:35 - 2007 Oct 01, 01:53 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 10.2 * Moon: 76 % sunlit, 24° distance * Sun: 141° distance * rough path description: Russia, Scandanavia, NE Canada The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .023", 76° ) * approx speed of asteroid's shadow [km/s]: 10.2264 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1778-01327-1 by 98 Ianthe on 2007 Oct 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 -128 0 0 .. .. .. .. .. .. .. .. .. 48 14 54 .. .. .. 48 45 53 .. .. .. -127 0 0 48 9 1 1 53 5 1 45 2 48 56 47 47 21 50 49 27 41 .. .. .. -126 0 0 48 50 14 1 53 4 2 45 1 49 37 52 48 3 11 50 8 41 .. .. .. -125 0 0 49 30 40 1 53 4 3 46 0 50 18 9 48 43 45 50 48 52 .. .. .. -124 0 0 50 10 17 1 53 3 4 47 0 50 57 37 49 23 31 51 28 14 48 53 53 -123 0 0 50 49 5 1 53 2 5 48 -1 51 36 15 50 2 30 52 6 45 49 32 58 -122 0 0 51 27 5 1 53 1 6 49 -2 52 14 4 50 40 40 52 44 27 50 11 14 -121 0 0 52 4 15 1 53 0 6 49 -2 52 51 3 51 18 1 53 21 18 50 48 43 -120 0 0 52 40 36 1 52 59 7 50 -3 53 27 11 51 54 34 53 57 19 51 25 23 -119 0 0 53 16 7 1 52 57 8 51 -3 54 2 30 52 30 17 54 32 30 52 1 14 -118 0 0 53 50 50 1 52 56 9 52 -4 54 37 0 53 5 12 55 6 50 52 36 17 -117 0 0 54 24 43 1 52 54 10 53 -5 55 10 39 53 39 19 55 40 21 53 10 31 -116 0 0 54 57 47 1 52 52 11 53 -5 55 43 30 54 12 37 56 13 3 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297 20 15 29 44 14 7 58 15 56 13 13 42 6 86 0 0 14 6 23 1 35 55 13 297 21 14 47 13 13 25 55 15 13 32 13 0 12 87 0 0 13 24 43 1 35 51 12 298 22 14 5 18 12 44 30 14 31 28 12 18 56 88 0 0 12 43 41 1 35 48 11 298 23 13 24 1 12 3 41 13 50 2 11 38 16 89 0 0 12 3 17 1 35 45 10 298 24 12 43 23 11 23 32 13 9 14 10 58 16 90 0 0 11 23 34 1 35 43 9 298 25 12 3 25 10 44 2 12 29 7 10 18 55 91 0 0 10 44 30 1 35 41 8 298 26 11 24 8 10 5 13 11 49 40 9 40 14 92 0 0 10 6 9 1 35 39 6 299 27 10 45 32 9 27 5 11 10 56 9 2 15 93 0 0 9 28 30 1 35 37 5 299 28 10 7 39 8 49 39 10 32 53 8 24 58 94 0 0 8 51 34 1 35 36 4 299 29 9 30 30 8 12 57 9 55 35 .. .. .. 95 0 0 8 15 21 1 35 35 3 299 31 8 54 4 7 36 57 9 19 0 .. .. .. 96 0 0 7 39 53 1 35 35 2 299 32 8 18 23 7 1 42 8 43 10 .. .. .. 97 0 0 7 5 10 1 35 34 1 299 33 7 43 26 .. .. .. 8 8 6 .. .. .. Data for the target star ------------------------ * name: TYC 1778-01327-1 * constellation : Triangulum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 27 39.1590 DE: +29 13 50.849 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .019 ) * V mag [mag]: 11.6 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (98) Ianthe approx. diameter [km]: 104 approx. diameter ["]: .071 distance from Earth [AU]: 2.00800 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 617 number of rejected observations: 48 time covered by the observations: 1927 Aug 30 - 2007 Sep 19 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.013, 61° remarks: * orbital elements for (98) Ianthe : Mean anomaly = 260.35319177 deg Arg. of pericenter = 158.51870807 deg Long. of node = 354.13431005 deg Inclination = 15.61047320 deg Eccentricity = 0.18932723 Semimajor axis = 2.68524016 AU Perihelion dist = 2.17685109 AU Mag: H = 8.75, G = 0.15 Epoch of elements : MJD 54374.07200000 TDT (2007 Oct 01.072) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 01 98 Ianthe 1h 44.3m UT 11.6 2 27 39.159 29 13 50.85TYC 1778-01327-1 11.9 13.4 104 10.2 2.008 -1.755 10.58 1.408 29.228 151.40 -2.98 1.7389 .22560 .48779 -5.24098 2.41840 -0.00290 -0.00217 2000 259.4411032007 927.00000158.518708354.134310 15.6104730.189327232.685240162.176851098.845 0.15 RATE 2.2399030 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.023 0.023 76.5 1.320 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org