IOTA/IOTA-ES occultation update for (407) Arachne / TYC 6859-00458-1 event on 2009 Aug 07, 12:48 UT Visible from Summary ------- On 2009 Aug 07 UT, the 95 km diameter asteroid (407) Arachne will occult a 10.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 12.8 mag (the magnitude of the asteroid) for at most 14.1 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: 98 * date and approx. time of event: 2009 Aug 07, 12:32 - 2009 Aug 07, 13:01 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 14.1 * Moon: 98 % sunlit, 52° distance * Sun: 145° distance * rough path description: Additional comments ------------------- close double star The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .028", 83° ) * approx speed of asteroid's shadow [km/s]: 6.7445 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6859-00458-1 by 407 Arachne on 2009 Aug 7 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 78 0 0 6 20 58 13 1 30 31 122 0 6 50 25 5 51 32 7 12 15 5 29 47 79 0 0 5 48 53 13 1 20 33 123 -1 6 18 21 5 19 29 6 40 10 4 57 44 80 0 0 5 16 50 13 1 10 34 123 -2 5 46 17 4 47 26 6 8 5 4 25 42 81 0 0 4 44 49 13 1 0 35 123 -3 5 14 15 4 15 26 5 36 2 3 53 42 82 0 0 4 12 51 13 0 49 36 123 -4 4 42 15 3 43 28 5 4 2 3 21 46 83 0 0 3 40 56 13 0 39 37 123 -5 4 10 19 3 11 35 4 32 6 2 49 53 84 0 0 3 9 6 13 0 28 38 123 -6 3 38 28 2 39 46 4 0 13 2 18 5 85 0 0 2 37 21 13 0 17 39 123 -8 3 6 41 2 8 2 3 28 26 1 46 22 86 0 0 2 5 42 13 0 5 40 123 -9 2 35 1 1 36 25 2 56 44 1 14 46 87 0 0 1 34 10 12 59 53 41 124 -10 2 3 27 1 4 54 2 25 9 0 43 16 88 0 0 1 2 45 12 59 41 42 124 -11 1 32 1 0 33 31 1 53 41 0 11 55 89 0 0 0 31 29 12 59 29 43 124 -12 1 0 43 0 2 17 1 22 22 - 0 19 18 90 0 0 0 0 21 12 59 17 45 124 -13 0 29 33 - 0 28 48 0 51 11 - 0 50 22 91 0 0 - 0 30 36 12 59 4 46 124 -14 - 0 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33 14 -18 19 37 -19 53 5 -150 0 0 -18 50 30 12 33 37 22 252 -55 -18 23 34 -19 17 24 -18 3 38 -19 37 18 -149 0 0 -18 34 9 12 33 31 21 251 -54 -18 7 10 -19 1 6 -17 47 11 -19 21 3 -148 0 0 -18 17 20 12 33 26 20 251 -53 -17 50 17 -18 44 21 -17 30 16 -19 4 20 -147 0 0 -18 0 3 12 33 20 19 251 -52 -17 32 56 -18 27 7 -17 12 52 -18 47 9 -146 0 0 -17 42 17 12 33 15 18 250 -51 -17 15 7 -18 9 26 -16 55 0 -18 29 30 -145 0 0 -17 24 4 12 33 10 17 250 -50 -16 56 50 -17 51 16 -16 36 40 -18 11 22 -144 0 0 -17 5 22 12 33 5 16 250 -49 -16 38 4 -17 32 38 -16 17 52 -17 52 47 -143 0 0 -16 46 12 12 33 1 15 250 -48 -16 18 51 -17 13 32 -15 58 35 -17 33 44 -142 0 0 -16 26 34 12 32 57 14 249 -47 -15 59 8 -16 53 57 -15 38 50 -17 14 12 -141 0 0 -16 6 27 12 32 53 13 249 -46 -15 38 58 -16 33 55 -15 18 36 -16 54 13 -140 0 0 -15 45 52 12 32 49 12 249 -45 -15 18 19 -16 13 24 -14 57 54 -16 33 45 -139 0 0 -15 24 49 12 32 45 11 249 -44 -14 57 12 -15 52 25 -14 36 44 -16 12 49 -138 0 0 -15 3 18 12 32 42 10 248 -43 -14 35 37 -15 30 58 -14 15 6 -15 51 25 -137 0 0 -14 41 19 12 32 39 9 248 -42 -14 13 33 -15 9 3 -13 53 0 -15 29 34 -136 0 0 -14 18 52 12 32 37 8 248 -41 -13 51 2 -14 46 40 -13 30 25 -15 7 14 -135 0 0 -13 55 57 12 32 35 7 248 -40 -13 28 3 -14 23 50 -13 7 23 -14 44 26 -134 0 0 -13 32 35 12 32 33 6 247 -39 -13 4 36 -14 0 31 -12 43 53 -14 21 11 -133 0 0 -13 8 44 12 32 31 5 247 -38 -12 40 41 -13 36 45 -12 19 55 -13 57 28 -132 0 0 -12 44 27 12 32 29 4 247 -37 -12 16 19 -13 12 32 -11 55 29 -13 33 18 -131 0 0 -12 19 42 12 32 28 3 247 -36 -11 51 30 -12 47 51 -11 30 37 -13 8 41 -130 0 0 -11 54 29 12 32 28 2 246 -35 -11 26 13 -12 22 44 -11 5 17 -12 43 36 -129 0 0 -11 28 50 12 32 27 1 246 -34 -11 0 30 -11 57 9 -10 39 30 -12 18 5 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6859-00458-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 44 09.9653 DE: -23 24 34.647 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .025 ) * V mag [mag]: 10.0 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (407) Arachne approx. diameter [km]: 95 approx. diameter ["]: .077 distance from Earth [AU]: 1.69200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 841 number of rejected observations: 100 time covered by the observations: 1903 Aug 05 - 2008 Jan 11 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.013, 78° remarks: * orbital elements for (407) Arachne : Mean anomaly = 285.07259682 deg Arg. of pericenter = 81.17120732 deg Long. of node = 294.83251524 deg Inclination = 7.53460731 deg Eccentricity = 0.07104826 Semimajor axis = 2.62522644 AU Perihelion dist = 2.43870866 AU Mag: H = 8.90, G = 0.15 Epoch of elements : MJD 55050.53300000 TDT (2009 Aug 07.533) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 7 407 Arachne 12h 48.1m UT 10.0 18 44 9.965-23 24 34.65TYC 6859-00458-1 10.5 12.8 95 14.1 1.692 -1.369 5.96 132.8287 -23.411 -10.59 16.29 12.8024 0.02817 0.09066 -3.62996 1.14666 0.00312 0.00026 2000 284.9490932009 8 7.00000 81.171207294.832515 7.5346070.07104826 2.6252264 2.4387087 8.9 5.00.15 RATE 2.3171490 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.028 83 1.37 0.029 0 54545.5020090807_0458-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org