IOTA/IOTA-ES occultation update for (76) Freia / TYC 1320-00481-1 event on 2008 Jan 03, 10:36 UT Visible from New Zealand Summary ------- On 2008 Jan 03 UT, the 184 km diameter asteroid (76) Freia will occult a 11.8 mag star in the constellation Orion for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.0 mag (the magnitude of the asteroid) for at most 17.3 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 Jan 03, 10:31 - 2008 Jan 03, 10:35 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 17.3 * Moon: 23 % sunlit, 135° distance * Sun: 167° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 374 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .023", 91° ) * approx speed of asteroid's shadow [km/s]: 10.6512 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1320-00481-1 by 76 Freia on 2008 Jan 03 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 ... .. .. -56 0 0 .. .. .. .. .. .. ... .. .. -115 19 58 ... .. .. -117 7 26 -112 31 19 -55 0 0 10 31 40 0 307 -4 ... .. .. -117 35 21 ... .. .. -119 23 23 -114 48 24 -54 0 0 10 31 40 2 309 -5 ... .. .. -119 54 6 ... .. .. -121 43 11 -117 8 17 -53 0 0 10 31 42 3 311 -7 ... .. .. -122 16 57 ... .. .. -124 7 36 -119 31 38 -52 0 0 10 31 44 5 313 -8 ... .. .. -124 44 46 ... .. .. -126 37 37 -121 59 15 -51 0 0 10 31 48 7 315 -10 -117 4 22 -127 18 36 ... .. .. -129 14 27 -124 32 3 -50 0 0 10 31 54 9 317 -12 -119 32 7 -129 59 47 ... .. .. -131 59 39 -127 11 10 -49 0 0 10 32 1 11 319 -14 -122 4 24 -132 50 4 -120 25 38 -134 55 18 -129 58 3 -48 0 0 10 32 10 13 321 -15 -124 42 14 -135 51 50 -123 1 14 -138 4 20 -132 54 36 -47 0 0 10 32 21 15 324 -17 -127 26 52 -139 8 29 -125 42 54 -141 31 9 -136 3 28 -46 0 0 10 32 34 17 326 -19 -130 19 54 -142 45 16 -128 32 4 -145 22 56 -139 28 28 -45 0 0 10 32 51 19 329 -20 -133 23 29 -146 51 14 -131 30 34 -149 53 7 -143 15 40 -44 0 0 10 33 11 21 332 -22 -136 40 38 -151 44 26 -134 40 51 -155 33 36 -147 35 45 -43 0 0 10 33 37 23 336 -24 -140 15 50 -158 15 8 -138 6 33 -164 53 17 -152 51 28 -42 0 0 10 34 12 25 341 -25 -144 16 26 ... .. .. -141 53 14 ... .. .. -160 16 8 -41 0 0 10 35 4 28 348 -26 -148 56 3 ... .. .. -146 10 28 ... .. .. ... .. .. -40 0 0 .. .. .. .. .. .. -154 46 48 ... .. .. -151 17 39 ... .. .. ... .. .. -39 0 0 .. .. .. .. .. .. -164 12 39 ... .. .. -158 9 59 ... .. .. Data for the target star ------------------------ * name: TYC 1320-00481-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 58 39.1899 DE: +20 26 50.670 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 11.8 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (76) Freia approx. diameter [km]: 184 approx. diameter ["]: .134 distance from Earth [AU]: 1.89500 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1066 number of rejected observations: 179 time covered by the observations: 1911 Jul 21 - 2007 Nov 25 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.015, 92° remarks: * orbital elements for (76) Freia : Mean anomaly = 356.80040961 deg Arg. of pericenter = 253.98396246 deg Long. of node = 204.53020593 deg Inclination = 2.11595020 deg Eccentricity = 0.16314890 Semimajor axis = 3.41850812 AU Perihelion dist = 2.86078228 AU Mag: H = 7.85, G = 0.15 Epoch of elements : MJD 54468.44200000 TDT (2008 Jan 03.442) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 03 76 Freia 10h 36.5m UT 11.8 5 58 39.190 20 26 50.67TYC 1320-00481-1 12.1 12.0 184 17.3 1.895 -1.984 -0.01 -171.905 20.446 21.93 -22.86 10.6088 .00003 -.87062 -6.01181 -0.00221 0.00128 0.00031 2000 355.48398920071226.00000253.983962204.530206 2.1159500.163148903.418508122.860782287.905 0.15 RATE 1.5593700 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.028 0.023 91.3 1.170 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 04:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org