IOTA/IOTA-ES occultation update for (270) Anahita / HIP 17453 event on 2008 Jul 05, 18:10 UT Visible from E Russia Summary ------- On 2008 Jul 05 UT, the 51 km diameter asteroid (270) Anahita will occult a 6.1 mag star in the constellation Taurus for observers along a path across E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.3 mag to 13.4 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: 94 * date and approx. time of event: 2008 Jul 05, 18:08 - 2008 Jul 05, 18:09 UT * midpoint of event [JD]: 2454653.2574375 * magnitude of target star: 6.1 * magnitude drop [mag]: 7.3 * estimated maximum duration [s]: 1.3 * Moon: 9 % sunlit, 81° distance * Sun: 45° distance * rough path description: E Russia The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .017 +/- .012) * 1 sigma uncertainty ellipse (major, minor, PA): ( .017", .012", 87° ) * approx speed of asteroid's shadow [km/s]: 39.8580 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 17453 by 270 Anahita on 2008 Jul 5 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 116 0 0 34 14 33 18 8 57 1 65 -28 33 51 17 34 38 1 .. .. .. 34 59 47 117 0 0 34 39 3 18 8 57 2 66 -27 34 15 41 35 2 37 .. .. .. 35 24 29 118 0 0 35 3 58 18 8 57 3 66 -26 34 40 30 35 27 38 34 19 5 35 49 36 119 0 0 35 29 16 18 8 57 4 67 -25 35 5 42 35 53 2 34 44 12 36 15 6 120 0 0 35 54 57 18 8 58 5 67 -25 35 31 17 36 18 49 35 9 41 36 40 59 121 0 0 36 21 0 18 8 58 5 68 -24 35 57 14 36 44 59 35 35 33 37 7 14 122 0 0 36 47 24 18 8 58 6 69 -23 36 23 32 37 11 29 36 1 46 37 33 51 123 0 0 37 14 9 18 8 59 7 69 -22 36 50 11 37 38 21 36 28 19 38 0 48 124 0 0 37 41 14 18 8 59 8 70 -21 37 17 10 38 5 32 36 55 12 38 28 5 125 0 0 38 8 38 18 9 0 9 70 -20 37 44 27 38 33 2 37 22 24 38 55 41 126 0 0 38 36 19 18 9 1 10 71 -20 38 12 3 39 0 50 37 49 54 39 23 35 127 0 0 39 4 18 18 9 1 11 72 -19 38 39 55 39 28 55 38 17 41 39 51 47 128 0 0 39 32 33 18 9 2 12 72 -18 39 8 4 39 57 17 38 45 44 40 20 14 129 0 0 40 1 4 18 9 3 13 73 -17 39 36 28 40 25 53 39 14 3 40 48 57 130 0 0 40 29 48 18 9 4 13 74 -16 40 5 7 40 54 44 39 42 36 41 17 54 131 0 0 40 58 46 18 9 5 14 75 -15 40 33 59 41 23 49 40 11 22 41 47 4 132 0 0 41 27 57 18 9 6 15 75 -15 41 3 3 41 53 5 40 40 21 42 16 26 133 0 0 41 57 18 18 9 7 16 76 -14 41 32 19 42 22 33 41 9 32 42 46 0 134 0 0 42 26 50 18 9 8 17 77 -13 42 1 44 42 52 11 41 38 52 43 15 44 135 0 0 42 56 31 18 9 9 18 78 -12 42 31 20 43 21 58 42 8 22 43 45 36 136 0 0 43 26 20 18 9 10 19 78 -11 43 1 3 43 51 53 42 38 0 44 15 37 137 0 0 43 56 16 18 9 11 19 79 -10 43 30 53 44 21 54 43 7 46 44 45 44 138 0 0 44 26 18 18 9 12 20 80 -9 44 0 49 44 52 2 43 37 37 45 15 57 139 0 0 44 56 24 18 9 14 21 81 -9 44 30 50 45 22 13 44 7 33 45 46 14 140 0 0 45 26 34 18 9 15 22 82 -8 45 0 55 45 52 29 44 37 33 46 16 34 141 0 0 45 56 46 18 9 17 22 83 -7 45 31 2 46 22 46 45 7 36 46 46 57 142 0 0 46 27 0 18 9 18 23 83 -6 46 1 11 46 53 5 45 37 40 47 17 20 143 0 0 46 57 13 18 9 19 24 84 -5 46 31 20 47 23 23 46 7 45 47 47 43 144 0 0 47 27 26 18 9 21 25 85 -4 47 1 28 47 53 41 46 37 49 48 18 5 145 0 0 47 57 36 18 9 22 25 86 -3 47 31 34 48 23 55 47 7 51 48 48 24 146 0 0 48 27 43 18 9 24 26 87 -3 48 1 37 48 54 7 47 37 51 49 18 39 147 0 0 48 57 46 18 9 26 27 88 -2 48 31 36 49 24 13 48 7 46 49 48 49 148 0 0 49 27 43 18 9 27 27 89 -1 49 1 29 49 54 14 48 37 36 50 18 53 149 0 0 49 57 33 18 9 29 28 90 0 49 31 15 50 24 7 49 7 19 50 48 50 Uncertainty in time = +/- 1 secs [Prediction of 2008 May 26.0] Data for the target star ------------------------ * name: HIP 17453 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 44 28.2203 DE: +20 55 43.336 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .015, .011 ) * V mag [mag]: 6.1 * B mag [mag]: 6.1 * Apparent position with proper motion RA(deg): 56.2405941540 DE(deg): 20.9563742675 * Equation of equinoxes (radians) : 0.000052020630961 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (270) Anahita approx. diameter [km]: 51 approx. diameter ["]: .027 distance from Earth [AU]: 2.59000 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 940 number of rejected observations: 127 time covered by the observations: 1900 Sep 20 - 2007 Sep 07 1 sigma uncertainty ellipse (major, minor, PA): 0.009, 0.005, 80° remarks: * orbital elements for (270) Anahita : Mean anomaly = 48.19898637 deg Arg. of pericenter = 80.24952469 deg Long. of node = 254.55415446 deg Inclination = 2.36581837 deg Eccentricity = 0.15021193 Semimajor axis = 2.19824064 AU Perihelion dist = 1.86803868 AU Mag: H = 8.71, G = 0.15 Epoch of elements : MJD 54652.75700000 TDT (2008 Jul 05.757) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 5 270 Anahita 18h 10.7m UT 6.1 3 44 28.220 20 55 43.34HIP 17453 6.1 13.4 51 1.3 2.590 5.330 16.10 -140.6691 20.925 -91.50 22.70 18.1785 -0.15751 0.73290 21.99114 4.74375 -0.00357 -0.00074 2000 47.3652512008 7 3.00000 80.249525254.554154 2.3658180.15021193 2.1982406 1.8680387 8.8 5.00.15 RATE 3.0240660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.017 0.012 87 1.46 0.012 0 54612.5020080705__17453 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 16:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org