IOTA/IOTA-ES occultation update for (6958) 1988 TX1 / HIP 4906 event on 2009 Oct 22, 11:58 UT Visible from W Canada, Indonesia Summary ------- On 2009 Oct 22 UT, the 10 km diameter asteroid (6958) 1988 TX1 will occult a 4.3 mag star in the constellation Pisces for observers along a path across W Canada, Indonesia. In the case of an occultation, the combined light of the asteroid and the star will drop by 12.6 mag to 16.9 mag (the magnitude of the asteroid) for at most 0.8 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: . The event at a glimpse ---------------------- * Rank: 7 * date and approx. time of event: 2009 Oct 22, 11:50 - 2009 Oct 22, 12:06 UT * midpoint of event [JD]: 2455126.99885833 * magnitude of target star: 4.3 * magnitude drop [mag]: 12.6 * estimated maximum duration [s]: 0.8 * Moon: 19 % sunlit, 117° distance * Sun: 168° distance * rough path description: W Canada, Indonesia The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 9.36 * 1 sigma uncertainty interval [seconds]: +/- 12.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .108 +/- .060) * 1 sigma uncertainty ellipse (major, minor, PA): ( .110", .055", 76° ) * approx speed of asteroid's shadow [km/s]: 12.2425 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 4906 by 6958 1988 TX1 on 2009 Oct 22 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 Latitude Latitude Latitude Latitude 89 0 0 -18 9 57 12 6 32 12 77 -1 -18 7 2 -18 12 51 -17 12 21 -19 7 16 90 0 0 -17 53 11 12 6 30 13 77 -2 -17 50 15 -17 56 6 -16 55 26 -18 50 40 91 0 0 -17 35 47 12 6 28 14 77 -3 -17 32 51 -17 38 43 -16 37 52 -18 33 26 92 0 0 -17 17 45 12 6 25 15 76 -4 -17 14 48 -17 20 41 -16 19 39 -18 15 34 93 0 0 -16 59 4 12 6 23 16 76 -5 -16 56 8 -17 2 1 -16 0 48 -17 57 4 94 0 0 -16 39 46 12 6 20 17 76 -6 -16 36 49 -16 42 43 -15 41 19 -17 37 57 95 0 0 -16 19 49 12 6 17 18 76 -7 -16 16 51 -16 22 47 -15 21 11 -17 18 11 96 0 0 -15 59 14 12 6 14 19 75 -8 -15 56 16 -16 2 13 -15 0 24 -16 57 47 97 0 0 -15 38 1 12 6 11 20 75 -9 -15 35 2 -15 41 0 -14 38 59 -16 36 46 98 0 0 -15 16 9 12 6 7 21 75 -10 -15 13 9 -15 19 9 -14 16 55 -16 15 6 99 0 0 -14 53 39 12 6 4 22 75 -11 -14 50 39 -14 56 39 -13 54 13 -15 52 48 100 0 0 -14 30 31 12 6 0 23 75 -12 -14 27 29 -14 33 32 -13 30 52 -15 29 52 101 0 0 -14 6 44 12 5 56 24 74 -13 -14 3 42 -14 9 45 -13 6 52 -15 6 18 102 0 0 -13 42 19 12 5 52 25 74 -14 -13 39 16 -13 45 21 -12 42 14 -14 42 5 103 0 0 -13 17 15 12 5 48 26 74 -15 -13 14 12 -13 20 18 -12 16 58 -14 17 15 104 0 0 -12 51 34 12 5 43 27 74 -16 -12 48 30 -12 54 37 -11 51 3 -13 51 47 105 0 0 -12 25 14 12 5 39 29 74 -17 -12 22 10 -12 28 18 -11 24 29 -13 25 40 106 0 0 -11 58 16 12 5 34 30 74 -18 -11 55 11 -12 1 21 -10 57 18 -12 58 56 107 0 0 -11 30 41 12 5 29 31 74 -19 -11 27 35 -11 33 47 -10 29 29 -12 31 35 108 0 0 -11 2 28 12 5 24 32 73 -20 -10 59 21 -11 5 34 -10 1 1 -12 3 36 109 0 0 -10 33 37 12 5 18 33 73 -21 -10 30 30 -10 36 45 - 9 31 57 -11 34 59 110 0 0 -10 4 10 12 5 13 34 73 -22 -10 1 2 -10 7 17 - 9 2 14 -11 5 46 111 0 0 - 9 34 5 12 5 7 35 73 -23 - 9 30 56 - 9 37 13 - 8 31 55 -10 35 55 112 0 0 - 9 3 23 12 5 1 36 73 -24 - 9 0 14 - 9 6 33 - 8 0 59 -10 5 28 113 0 0 - 8 32 6 12 4 55 37 73 -25 - 8 28 55 - 8 35 16 - 7 29 27 - 9 34 25 114 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Uncertainty in time = +/- 13 secs Prediction of 2009 Sep 20.0 Data for the target star ------------------------ * name: HIP 4906 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 02 56.5555 DE: +07 53 24.736 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .004, .003 ) * V mag [mag]: 4.3 * B mag [mag]: 5.2 * Apparent position with proper motion RA(deg): 15.8720697118 DE(deg): 7.9467187650 * Equation of equinoxes (radians) : 0.000062750311304 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6958) 1988 TX1 approx. diameter [km]: 10 approx. diameter ["]: .007 distance from Earth [AU]: 1.96600 * orbital information: orbit source: Preston date of fit: 2009 Sep 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 565 number of rejected observations: 7 time covered by the observations: 1955 May 22 - 2008 Jul 07 1 sigma uncertainty ellipse (major, minor, PA): 0.110, 0.055, 76° remarks: * orbital elements for (6958) 1988 TX1 : Mean anomaly = 70.22194797 deg Arg. of pericenter = 94.31177412 deg Long. of node = 205.93784652 deg Inclination = 9.15430061 deg Eccentricity = 0.09731659 Semimajor axis = 3.02073453 AU Perihelion dist = 2.72676695 AU Mag: H = 12.71, G = 0.15 Epoch of elements : MJD 55126.49900000 TDT (2009 Oct 22.499) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 22 6958 1988 TX1 11h 58.4m UT 4.3 1 2 56.556 7 53 24.74HIP 4906 5.2 16.9 10 0.8 1.966 -1.680 -18.22 165.0945 7.896 -3.47 -11.20 11.9726 -0.15396 0.21263 -5.58087 -4.07457 0.00115 0.00036 2000 69.00188620091016.00000 94.311774205.937847 9.1543010.09731659 3.0207345 2.726766912.7 5.00.15 RATE 1.8773070 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.110 0.055 76 10.36 0.066 0 55094.0020091022___4906 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Sep 20, 19:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org