IOTA/IOTA-ES occultation update for (6958) 1988 TX1 / TYC 0613-00127-1 event on 2009 Oct 08, 14:06 UT Visible from Summary ------- On 2009 Oct 08 UT, the 15 km diameter asteroid (6958) 1988 TX1 will occult a 10.4 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.1 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 10 * date and approx. time of event: 2009 Oct 08, 13:59 - 2009 Oct 08, 14:12 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 1.1 * Moon: 80 % sunlit, 48° distance * Sun: 175° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 6.55 * 1 sigma uncertainty interval [seconds]: +/- 12.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .118 +/- .065) * 1 sigma uncertainty ellipse (major, minor, PA): ( .120", .061", 78° ) * approx speed of asteroid's shadow [km/s]: 12.7449 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0613-00127-1 by 6958 1988 TX1 on 2009 Oct 8 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 58 31 40 1 0 0 14 12 59 1 80 -5 58 3 36 58 58 52 ... .. .. ... .. .. 63 13 34 2 0 0 14 12 56 6 80 -10 62 52 17 63 34 28 ... .. .. 67 41 31 Latitude Latitude Latitude Latitude 64 0 0 2 11 29 14 12 55 6 81 -11 2 16 37 2 6 22 3 24 20 .. .. .. 65 0 0 2 27 0 14 12 54 8 81 -12 2 32 9 2 21 52 3 40 3 .. .. .. 66 0 0 2 43 17 14 12 52 9 81 -13 2 48 26 2 38 7 3 56 33 1 31 8 67 0 0 3 0 18 14 12 51 10 81 -14 3 5 29 2 55 8 4 13 48 1 47 56 68 0 0 3 18 5 14 12 49 11 81 -15 3 23 17 3 12 54 4 31 50 2 5 29 69 0 0 3 36 38 14 12 47 12 81 -16 3 41 50 3 31 25 4 50 37 2 23 47 70 0 0 3 55 55 14 12 44 13 81 -17 4 1 9 3 50 42 5 10 10 2 42 49 71 0 0 4 15 58 14 12 42 14 81 -18 4 21 13 4 10 43 5 30 30 3 2 36 72 0 0 4 36 46 14 12 39 15 81 -19 4 42 2 4 31 30 5 51 35 3 23 8 73 0 0 4 58 19 14 12 36 16 81 -20 5 3 36 4 53 2 6 13 25 3 44 24 74 0 0 5 20 36 14 12 33 17 81 -21 5 25 55 5 15 18 6 36 1 4 6 24 75 0 0 5 43 39 14 12 29 18 82 -22 5 48 59 5 38 20 6 59 23 4 29 9 76 0 0 6 7 27 14 12 26 19 82 -23 6 12 48 6 2 6 7 23 30 4 52 38 77 0 0 6 31 59 14 12 22 20 82 -24 6 37 21 6 26 37 7 48 22 5 16 51 78 0 0 6 57 15 14 12 18 21 82 -25 7 2 39 6 51 52 8 14 0 5 41 47 79 0 0 7 23 16 14 12 14 22 82 -26 7 28 41 7 17 51 8 40 22 6 7 28 80 0 0 7 50 1 14 12 10 23 83 -27 7 55 28 7 44 34 9 7 29 6 33 52 81 0 0 8 17 30 14 12 5 24 83 -28 8 22 58 8 12 2 9 35 21 7 0 59 82 0 0 8 45 42 14 12 0 25 83 -29 8 51 12 8 40 13 10 3 56 7 28 50 83 0 0 9 14 38 14 11 55 26 84 -30 9 20 10 9 9 7 10 33 16 7 57 23 84 0 0 9 44 17 14 11 50 27 84 -31 9 49 51 9 38 44 11 3 19 8 26 39 85 0 0 10 14 39 14 11 45 28 84 -32 10 20 14 10 9 4 11 34 6 8 56 37 86 0 0 10 45 43 14 11 39 29 85 -33 10 51 20 10 40 6 12 5 35 9 27 17 87 0 0 11 17 29 14 11 33 30 85 -34 11 23 8 11 11 51 12 37 48 9 58 38 88 0 0 11 49 57 14 11 27 31 86 -34 11 55 37 11 44 17 13 10 42 10 30 41 89 0 0 12 23 6 14 11 21 32 86 -35 12 28 48 12 17 24 13 44 18 11 3 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53 69 39 36 -114 0 0 70 46 11 13 59 31 7 278 -3 70 51 17 70 41 6 71 58 34 69 34 55 -113 0 0 70 41 24 13 59 31 7 279 -2 70 46 31 70 36 18 71 54 0 69 29 56 -112 0 0 70 36 21 13 59 30 7 280 -2 70 41 29 70 31 14 71 49 10 69 24 40 -111 0 0 70 31 1 13 59 30 6 281 -2 70 36 9 70 25 53 71 44 4 69 19 6 -110 0 0 70 25 23 13 59 29 6 282 -1 70 30 33 70 20 14 71 38 41 .. .. .. -109 0 0 70 19 29 13 59 29 6 282 -1 70 24 39 70 14 18 71 33 2 .. .. .. -108 0 0 70 13 16 13 59 28 5 283 -1 70 18 28 70 8 5 71 27 6 .. .. .. -107 0 0 70 6 46 13 59 28 5 284 0 70 11 59 70 1 33 71 20 52 .. .. .. Uncertainty in time = +/- 13 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0613-00127-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 12 51.8897 DE: +09 37 13.576 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .021 ) * V mag [mag]: 10.4 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6958) 1988 TX1 approx. diameter [km]: 15 approx. diameter ["]: .011 distance from Earth [AU]: 1.93800 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: MPC (via Astdys) number of used observations: 553 number of rejected observations: 7 time covered by the observations: 1955 May 22 - 2007 Apr 22 1 sigma uncertainty ellipse (major, minor, PA): 0.118, 0.057, 77° remarks: * orbital elements for (6958) 1988 TX1 : Mean anomaly = 67.59405911 deg Arg. of pericenter = 94.32720468 deg Long. of node = 205.93795497 deg Inclination = 9.15413140 deg Eccentricity = 0.09733149 Semimajor axis = 3.02082857 AU Perihelion dist = 2.72680683 AU Mag: H = 12.69, G = 0.15 Epoch of elements : MJD 55112.58800000 TDT (2009 Oct 08.588) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 8 6958 1988 TX1 14h 6.2m UT 10.4 1 12 51.890 9 37 13.58TYC 0613-00127-1 11.2 15.8 15 1.1 1.938 -1.816 -18.54 149.3284 9.626 -34.67 -6.08 14.1032 -0.32946 0.47746 -5.92044 -4.08606 -0.00044 -0.00037 2000 67.108235200910 6.00000 94.327205205.937955 9.1541310.09733149 3.0208286 2.726806811.8 5.00.15 RATE 1.8772190 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.120 0.061 78 7.55 0.070 0 54581.5020091008_0127-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org