IOTA/IOTA-ES occultation update for (115) Thyra / TYC 1162-00555-1 event on 2008 Jan 01, 06:23 UT Visible from USA, Mexico in twilight Summary ------- On 2008 Jan 01 UT, the 80 km diameter asteroid (115) Thyra will occult a 11.5 mag star in the constellation Pegasus for observers along a path across USA, Mexico in twilight. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 11.7 mag (the magnitude of the asteroid) for at most 3.0 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: 95 * date and approx. time of event: 2008 Jan 01, 06:19 - 2008 Jan 01, 06:26 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 3.0 * Moon: 41 % sunlit, 154° distance * Sun: 76° distance * rough path description: USA, Mexico in twilight The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .023", 87° ) * approx speed of asteroid's shadow [km/s]: 26.7927 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1162-00555-1 by 115 Thyra on 2008 Jan 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 68 0 0 - 4 54 15 6 19 7 0 81 65 - 5 16 49 - 4 31 38 - 5 36 13 - 4 12 9 69 0 0 - 4 44 23 6 19 7 1 81 65 - 5 7 0 - 4 21 45 - 5 26 24 - 4 2 15 70 0 0 - 4 34 11 6 19 7 2 81 66 - 4 56 48 - 4 11 31 - 5 16 14 - 3 52 0 71 0 0 - 4 23 38 6 19 7 3 81 66 - 4 46 16 - 4 0 56 - 5 5 43 - 3 41 24 72 0 0 - 4 12 43 6 19 8 4 81 67 - 4 35 23 - 3 50 1 - 4 54 52 - 3 30 27 73 0 0 - 4 1 28 6 19 8 5 81 67 - 4 24 10 - 3 38 44 - 4 43 39 - 3 19 9 74 0 0 - 3 49 52 6 19 9 6 80 68 - 4 12 35 - 3 27 7 - 4 32 6 - 3 7 31 75 0 0 - 3 37 56 6 19 9 7 80 68 - 4 0 40 - 3 15 9 - 4 20 12 - 2 55 31 76 0 0 - 3 25 39 6 19 10 8 80 68 - 3 48 25 - 3 2 50 - 4 7 58 - 2 43 12 77 0 0 - 3 13 2 6 19 10 9 80 68 - 3 35 50 - 2 50 12 - 3 55 24 - 2 30 32 78 0 0 - 3 0 5 6 19 11 10 80 68 - 3 22 54 - 2 37 13 - 3 42 30 - 2 17 32 79 0 0 - 2 46 47 6 19 12 11 80 69 - 3 9 38 - 2 23 54 - 3 29 16 - 2 4 11 80 0 0 - 2 33 10 6 19 13 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42 54 6 26 47 9 275 -67 32 20 28 33 5 21 32 1 13 33 24 41 -119 0 0 32 36 22 6 26 48 8 276 -67 32 13 56 32 58 51 31 54 40 33 18 12 -118 0 0 32 29 33 6 26 48 7 276 -68 32 7 5 32 52 2 31 47 48 33 11 25 -117 0 0 32 22 24 6 26 49 6 277 -69 31 59 56 32 44 55 31 40 38 33 4 18 -116 0 0 32 14 58 6 26 49 6 277 -70 31 52 28 32 37 29 31 33 9 32 56 54 -115 0 0 32 7 12 6 26 49 5 278 -71 31 44 41 32 29 45 31 25 21 32 49 11 -114 0 0 31 59 8 6 26 50 4 278 -72 31 36 36 32 21 43 31 17 15 32 41 9 -113 0 0 31 50 46 6 26 50 3 279 -72 31 28 12 32 13 22 31 8 50 32 32 49 -112 0 0 31 42 5 6 26 50 2 279 -73 31 19 30 32 4 42 31 0 7 32 24 11 -111 0 0 31 33 6 6 26 50 1 280 -74 31 10 30 31 55 44 30 51 5 32 15 14 -110 0 0 31 23 49 6 26 50 0 280 -75 31 1 11 31 46 28 30 41 45 32 6 0 Data for the target star ------------------------ * name: TYC 1162-00555-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 27 34.8475 DE: +08 57 48.198 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .034, .022 ) * V mag [mag]: 11.5 * B mag [mag]: 12.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (115) Thyra approx. diameter [km]: 80 approx. diameter ["]: .057 distance from Earth [AU]: 1.92100 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 881 number of rejected observations: 153 time covered by the observations: 1904 Aug 02 - 2007 Dec 06 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.008, 56° remarks: * orbital elements for (115) Thyra : Mean anomaly = 347.02190477 deg Arg. of pericenter = 96.90721820 deg Long. of node = 308.97736020 deg Inclination = 11.60220034 deg Eccentricity = 0.19181159 Semimajor axis = 2.37963801 AU Perihelion dist = 1.92319586 AU Mag: H = 7.46, G = 0.12 Epoch of elements : MJD 54466.26600000 TDT (2008 Jan 01.266) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 01 115 Thyra 6h 23.0m UT 11.5 23 27 34.847 8 57 48.20TYC 1162-00555-1 12.2 11.7 80 3.0 1.921 4.436 21.71 155.861 8.958 85.06 -23.05 6.3829 -.07330 .21797 14.35984 4.74193 0.00473 0.00235 2000 345.33950920071226.00000 96.907218308.977360 11.6022000.191811592.379638011.923195867.515 0.12 RATE 2.6849590 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.035 0.023 86.9 1.430 0.025 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 03:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org