IOTA/IOTA-ES occultation update for (7318) Dyukov / TYC 6331-01436-1 event on 2007 Aug 01, 19:48 UT Visible from SE Asia, China Summary ------- On 2007 Aug 01 UT, the 13 km diameter asteroid (7318) Dyukov will occult a 8.8 mag star in the constellation Capricornus for observers along a path across SE Asia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 14.3 mag (the magnitude of the asteroid) for at most 1.3 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: . The event at a glimpse ---------------------- * Rank: 8 * date and approx. time of event: 2007 Aug 01, 19:37 - 2007 Aug 01, 19:58 UT * midpoint of event [JD]: 2454314.3248375 * magnitude of target star: 8.8 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.3 * Moon: 90 % sunlit, 36° distance * Sun: 178° distance * rough path description: SE Asia, China The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 7.86 * 1 sigma uncertainty interval [seconds]: +/- 10.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .149 +/- .082) * 1 sigma uncertainty ellipse (major, minor, PA): ( .149", .082", 88° ) * approx speed of asteroid's shadow [km/s]: 9.9120 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6331-01436-1 by 7318 Dyukov on 2007 Aug 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 ' " Longitude Longitude Longitude Longitude ... .. .. 43 0 0 .. .. .. .. .. .. ... .. .. ... .. .. 138 27 37 ... .. .. 138 40 22 42 0 0 19 37 4 2 246 -1 138 28 42 138 52 6 135 32 31 142 5 19 135 46 48 41 0 0 19 37 6 5 244 -4 135 36 7 135 57 33 132 53 34 138 52 50 Latitude Latitude Latitude Latitude 134 0 0 40 19 57 19 37 7 6 243 -5 40 23 53 40 16 1 41 25 44 39 14 9 133 0 0 39 56 22 19 37 8 7 243 -6 40 0 20 39 52 25 41 2 32 38 50 12 132 0 0 39 32 0 19 37 10 8 242 -7 39 35 59 39 28 1 40 38 34 38 25 26 131 0 0 39 6 50 19 37 11 9 241 -8 39 10 50 39 2 50 40 13 47 37 59 52 130 0 0 38 40 51 19 37 13 10 241 -9 38 44 53 38 36 49 39 48 13 37 33 29 129 0 0 38 14 2 19 37 15 11 240 -9 38 18 6 38 9 59 39 21 49 37 6 16 128 0 0 37 46 24 19 37 16 12 240 -10 37 50 28 37 42 19 38 54 36 36 38 11 127 0 0 37 17 54 19 37 19 12 239 -11 37 22 0 37 13 48 38 26 32 36 9 16 126 0 0 36 48 32 19 37 21 13 238 -12 36 52 40 36 44 25 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30 -48 36 36 -47 33 47 -49 32 19 - 26 0 0 -48 26 59 19 58 11 13 99 -15 -48 23 26 -48 30 32 -47 27 36 -49 26 22 - 27 0 0 -48 20 23 19 58 12 13 100 -14 -48 16 49 -48 23 57 -47 20 52 -49 19 54 - 28 0 0 -48 13 15 19 58 14 12 100 -13 -48 9 41 -48 16 49 -47 13 36 -49 12 54 - 29 0 0 -48 5 34 19 58 16 11 101 -13 -48 1 59 -48 9 9 -47 5 47 -49 5 22 - 30 0 0 -47 57 20 19 58 17 11 102 -12 -47 53 45 -48 0 55 -46 57 24 -48 57 17 - 31 0 0 -47 48 33 19 58 18 10 103 -11 -47 44 57 -47 52 9 -46 48 26 -48 48 40 - 32 0 0 -47 39 12 19 58 20 9 103 -10 -47 35 36 -47 42 49 -46 38 55 -48 39 30 - 33 0 0 -47 29 17 19 58 21 9 104 -10 -47 25 40 -47 32 54 -46 28 49 -48 29 46 - 34 0 0 -47 18 48 19 58 22 8 105 -9 -47 15 10 -47 22 26 -46 18 7 -48 19 28 - 35 0 0 -47 7 43 19 58 23 7 105 -8 -47 4 5 -47 11 22 -46 6 50 -48 8 36 - 36 0 0 -46 56 3 19 58 24 6 106 -8 -46 52 23 -46 59 42 -45 54 57 -47 57 9 - 37 0 0 -46 43 46 19 58 25 6 107 -7 -46 40 6 -46 47 26 -45 42 26 -47 45 6 - 38 0 0 -46 30 53 19 58 26 5 108 -6 -46 27 12 -46 34 34 -45 29 19 -47 32 28 - 39 0 0 -46 17 22 19 58 26 4 108 -6 -46 13 41 -46 21 4 -45 15 33 -47 19 12 - 40 0 0 -46 3 14 19 58 27 4 109 -5 -45 59 31 -46 6 57 -45 1 9 -47 5 19 - 41 0 0 -45 48 27 19 58 27 3 110 -4 -45 44 43 -45 52 11 -44 46 5 -46 50 49 - 42 0 0 -45 33 1 19 58 28 2 110 -3 -45 29 16 -45 36 45 -44 30 22 -46 35 40 - 43 0 0 -45 16 54 19 58 28 1 111 -3 -45 13 9 -45 20 40 -44 13 58 -46 19 51 - 44 0 0 -45 0 8 19 58 28 1 112 -2 -44 56 21 -45 3 55 -43 56 52 -46 3 23 - 45 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -45 46 14 Data for the target star ------------------------ * name: TYC 6331-01436-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 43 49.3929 DE: -15 48 40.463 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .026, .028 ) * V mag [mag]: 8.8 * B mag [mag]: 9.2 * Apparent position with proper motion RA(deg): 311.0701007211 DE(deg): -15.7833084625 * Equation of equinoxes (radians) : 0.000033225068308 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7318) Dyukov approx. diameter [km]: 13 approx. diameter ["]: .015 distance from Earth [AU]: 1.19700 * orbital information: orbit source: Preston date of fit: 2007 Jul 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 605 number of rejected observations: 10 time covered by the observations: 1984 Jan 25 - 2007 Jun 22 1 sigma uncertainty ellipse (major, minor, PA): 0.147, 0.077, 88° remarks: * orbital elements for (7318) Dyukov : Mean anomaly = 334.67058939 deg Arg. of pericenter = 211.10325016 deg Long. of node = 134.04947060 deg Inclination = 13.80429290 deg Eccentricity = 0.17835189 Semimajor axis = 2.61256161 AU Perihelion dist = 2.14660631 AU Mag: H = 12.28, G = 0.15 Epoch of elements : MJD 54313.82500000 TDT (2007 Aug 01.825) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 01 7318 Dyukov 19h 47.8m UT 8.8 20 43 49.393-15 48 40.46TYC 6331-01436-1 9.2 14.3 13 1.3 1.197 -1.985 -29.50 63.976 -15.803 -115.35 17.96 19.7961 .01254 -.01215 -3.89748 -4.01361 0.00003 -0.00021 2000 333.7778262007 729.00000211.103250134.049471 13.8042930.178351892.612561612.1466063112.05 0.15 RATE 2.3340190 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.149 0.082 88.1 8.860 0.118 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 08, 19:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org