IOTA/IOTA-ES occultation update for (2426) Simonov / TYC 1170-00050-1 event on 2007 Oct 01, 03:51 UT Visible from W Africa, Brazil, Bolivia, Chile Summary ------- On 2007 Oct 01 UT, the 24 km diameter asteroid (2426) Simonov will occult a 10.3 mag star in the constellation Pegasus for observers along a path across W Africa, Brazil, Bolivia, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.8 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: UCAC. The event at a glimpse ---------------------- * Rank: 16 * date and approx. time of event: 2007 Oct 01, 03:43 - 2007 Oct 01, 03:58 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.8 * Moon: 75 % sunlit, 66° distance * Sun: 168° distance * rough path description: W Africa, Brazil, Bolivia, Chile The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 4.24 * 1 sigma uncertainty interval [seconds]: +/- 9.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .084 +/- .069) * 1 sigma uncertainty ellipse (major, minor, PA): ( .085", .067", 71° ) * approx speed of asteroid's shadow [km/s]: 13.1946 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1170-00050-1 by 2426 Simonov on 2007 Oct 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 -146 0 0 -57 13 23 3 58 29 0 71 -1 -57 5 47 -57 20 59 .. .. .. .. .. .. -145 0 0 -57 2 12 3 58 29 1 71 -1 -56 54 35 -57 9 49 .. .. .. -58 14 51 -144 0 0 -56 50 36 3 58 29 1 70 -2 -56 42 57 -56 58 15 .. .. .. -58 3 31 -143 0 0 -56 38 35 3 58 29 2 69 -3 -56 30 54 -56 46 16 .. .. .. -57 51 46 -142 0 0 -56 26 8 3 58 29 2 68 -3 -56 18 26 -56 33 51 .. .. .. -57 39 36 -141 0 0 -56 13 16 3 58 29 3 67 -4 -56 5 32 -56 21 0 .. .. .. -57 27 0 -140 0 0 -55 59 57 3 58 28 4 66 -4 -55 52 11 -56 7 43 .. .. .. -57 13 59 -139 0 0 -55 46 12 3 58 28 4 66 -5 -55 38 24 -55 54 0 .. .. .. -57 0 31 -138 0 0 -55 32 0 3 58 27 5 65 -5 -55 24 11 -55 39 50 .. .. .. -56 46 37 -137 0 0 -55 17 21 3 58 27 5 64 -6 -55 9 30 -55 25 12 -54 3 16 -56 32 16 -136 0 0 -55 2 14 3 58 26 6 63 -7 -54 54 21 -55 10 8 -53 47 51 -56 17 28 -135 0 0 -54 46 40 3 58 26 7 62 -7 -54 38 45 -54 54 35 -53 31 59 -56 2 12 -134 0 0 -54 30 37 3 58 25 7 61 -8 -54 22 40 -54 38 34 -53 15 38 -55 46 28 -133 0 0 -54 14 6 3 58 24 8 61 -9 -54 6 7 -54 22 5 -52 58 48 -55 30 16 -132 0 0 -53 57 5 3 58 23 9 60 -9 -53 49 4 -54 5 7 -52 41 29 -55 13 35 -131 0 0 -53 39 36 3 58 22 9 59 -10 -53 31 33 -53 47 39 -52 23 40 -54 56 26 -130 0 0 -53 21 37 3 58 21 10 58 -11 -53 13 32 -53 29 42 -52 5 22 -54 38 47 -129 0 0 -53 3 8 3 58 20 11 57 -11 -52 55 1 -53 11 16 -51 46 33 -54 20 38 -128 0 0 -52 44 8 3 58 19 11 57 -12 -52 35 59 -52 52 18 -51 27 15 -54 1 59 -127 0 0 -52 24 39 3 58 18 12 56 -13 -52 16 27 -52 32 51 -51 7 25 -53 42 49 -126 0 0 -52 4 38 3 58 16 13 55 -13 -51 56 24 -52 12 52 -50 47 4 -53 23 9 -125 0 0 -51 44 6 3 58 15 13 54 -14 -51 35 50 -51 52 22 -50 26 13 -53 2 58 -124 0 0 -51 23 2 3 58 13 14 53 -15 -51 14 44 -51 31 21 -50 4 49 -52 42 15 -123 0 0 -51 1 27 3 58 11 15 53 -15 -50 53 7 -51 9 47 -49 42 54 -52 21 0 -122 0 0 -50 39 19 3 58 10 16 52 -16 -50 30 57 -50 47 42 -49 20 27 -51 59 13 -121 0 0 -50 16 40 3 58 8 16 51 -17 -50 8 16 -50 25 5 -48 57 27 -51 36 54 -120 0 0 -49 53 27 3 58 6 17 50 -18 -49 45 1 -50 1 54 -48 33 55 -51 14 3 -119 0 0 -49 29 42 3 58 4 18 49 -18 -49 21 14 -49 38 12 -48 9 51 -50 50 38 -118 0 0 -49 5 24 3 58 1 19 49 -19 -48 56 54 -49 13 56 -47 45 13 -50 26 40 -117 0 0 -48 40 33 3 57 59 19 48 -20 -48 32 1 -48 49 7 -47 20 3 -50 2 9 -116 0 0 -48 15 9 3 57 57 20 47 -21 -48 6 34 -48 23 44 -46 54 19 -49 37 5 -115 0 0 -47 49 11 3 57 54 21 46 -21 -47 40 35 -47 57 49 -46 28 3 -49 11 27 -114 0 0 -47 22 40 3 57 51 22 46 -22 -47 14 2 -47 31 20 -46 1 13 -48 45 15 -113 0 0 -46 55 36 3 57 49 22 45 -23 -46 46 55 -47 4 17 -45 33 50 -48 18 30 -112 0 0 -46 27 58 3 57 46 23 44 -24 -46 19 15 -46 36 41 -45 5 54 -47 51 11 -111 0 0 -45 59 46 3 57 43 24 43 -25 -45 51 2 -46 8 31 -44 37 25 -47 23 18 -110 0 0 -45 31 1 3 57 39 25 42 -26 -45 22 15 -45 39 48 -44 8 23 -46 54 51 -109 0 0 -45 1 43 3 57 36 26 42 -26 -44 52 55 -45 10 32 -43 38 48 -46 25 50 -108 0 0 -44 31 52 3 57 32 27 41 -27 -44 23 2 -44 40 43 -43 8 41 -45 56 16 -107 0 0 -44 1 28 3 57 29 27 40 -28 -43 52 36 -44 10 20 -42 38 1 -45 26 8 -106 0 0 -43 30 31 3 57 25 28 39 -29 -43 21 38 -43 39 25 -42 6 49 -44 55 28 -105 0 0 -42 59 2 3 57 21 29 38 -30 -42 50 8 -43 7 58 -41 35 6 -44 24 14 -104 0 0 -42 27 1 3 57 17 30 38 -31 -42 18 5 -42 35 58 -41 2 51 -43 52 27 -103 0 0 -41 54 29 3 57 12 31 37 -32 -41 45 31 -42 3 27 -40 30 5 -43 20 9 -102 0 0 -41 21 25 3 57 8 32 36 -33 -41 12 26 -41 30 25 -39 56 49 -42 47 18 -101 0 0 -40 47 50 3 57 3 33 35 -34 -40 38 50 -40 56 52 -39 23 2 -42 13 56 -100 0 0 -40 13 46 3 56 59 33 34 -34 -40 4 45 -40 22 48 -38 48 47 -41 40 4 - 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Data for the target star ------------------------ * name: TYC 1170-00050-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 48 29.5665 DE: +09 52 21.494 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .019 ) * V mag [mag]: 10.3 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2426) Simonov approx. diameter [km]: 24 approx. diameter ["]: .016 distance from Earth [AU]: 2.07300 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 548 number of rejected observations: 21 time covered by the observations: 1931 Mar 21 - 2007 Sep 24 1 sigma uncertainty ellipse (major, minor, PA): 0.083, 0.064, 70° remarks: * orbital elements for (2426) Simonov : Mean anomaly = 109.92486515 deg Arg. of pericenter = 3.68143705 deg Long. of node = 237.39844235 deg Inclination = 8.48605099 deg Eccentricity = 0.11842731 Semimajor axis = 2.90882862 AU Perihelion dist = 2.56434388 AU Mag: H = 11.52, G = 0.15 Epoch of elements : MJD 54374.16000000 TDT (2007 Oct 01.160) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 01 2426 Simonov 3h 51.2m UT 10.3 23 48 29.566 9 52 21.49TYC 1170-00050-1 10.8 15.8 24 1.8 2.073 -1.795 -17.14 289.805 9.877 119.67 -3.02 3.8540 .23380 -.36221 -6.25621 -4.04024 0.00095 -0.00070 2000 109.0984082007 927.00000 3.681437237.398442 8.4860510.118427312.908828622.5643438811.45 0.15 RATE 1.9866750 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.085 0.067 71.2 5.240 0.068 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org