IOTA/IOTA-ES occultation update for (96) Aegle / TYC 7915-01613-1 event on 2008 Jul 05, 03:44 UT Visible from Africa, Argentina, Chile Summary ------- On 2008 Jul 05 UT, the 170 km diameter asteroid (96) Aegle will occult a 10.8 mag star in the constellation Corona Australis for observers along a path across Africa, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 12.3 mag (the magnitude of the asteroid) for at most 12.3 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: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2008 Jul 05, 03:36 - 2008 Jul 05, 03:52 UT * midpoint of event [JD]: 2454652.65587083 * magnitude of target star: 10.8 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 12.3 * Moon: 6 % sunlit, 145° distance * Sun: 164° distance * rough path description: Africa, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 170 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .026", 82° ) * approx speed of asteroid's shadow [km/s]: 13.7704 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7915-01613-1 by 96 Aegle 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 -140 0 0 10 21 8 3 52 10 1 129 -2 11 20 54 9 21 27 .. .. .. 8 51 38 -139 0 0 9 32 17 3 52 10 2 130 -4 10 32 8 8 32 30 11 2 5 8 2 38 -138 0 0 8 43 8 3 52 9 3 130 -5 9 43 4 7 43 17 10 13 4 7 13 23 -137 0 0 7 53 45 3 52 9 4 130 -6 8 53 45 6 53 50 9 23 46 6 23 54 -136 0 0 7 4 10 3 52 8 6 130 -7 8 4 12 6 4 12 8 34 15 5 34 14 -135 0 0 6 14 23 3 52 7 7 130 -8 7 14 28 5 14 23 7 44 32 4 44 24 -134 0 0 5 24 28 3 52 5 8 130 -10 6 24 34 4 24 27 6 54 40 3 54 27 -133 0 0 4 34 27 3 52 4 10 130 -11 5 34 34 3 34 25 6 4 40 3 4 25 -132 0 0 3 44 22 3 52 2 11 130 -12 4 44 29 2 44 19 5 14 34 2 14 19 -131 0 0 2 54 14 3 52 0 12 130 -13 3 54 20 1 54 12 4 24 26 1 24 13 -130 0 0 2 4 7 3 51 57 13 130 -15 3 4 12 1 4 7 3 34 16 0 34 8 -129 0 0 1 14 2 3 51 55 15 130 -16 2 14 4 0 14 4 2 44 7 - 0 15 54 -128 0 0 0 24 1 3 51 52 16 131 -17 1 24 1 - 0 35 54 1 54 2 - 1 5 50 -127 0 0 - 0 25 53 3 51 49 17 131 -18 0 34 3 - 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1 0 0 -32 0 28 3 39 2 45 246 -43 -31 10 49 -32 50 6 -30 45 58 -33 14 54 0 0 0 -31 39 31 3 38 57 44 245 -42 -30 49 39 -32 29 20 -30 24 43 -32 54 14 1 0 0 -31 17 54 3 38 52 43 245 -41 -30 27 51 -32 7 55 -30 2 48 -32 32 55 2 0 0 -30 55 39 3 38 47 43 244 -40 -30 5 23 -31 45 52 -29 40 14 -32 10 58 3 0 0 -30 32 43 3 38 42 42 244 -39 -29 42 15 -31 23 9 -29 17 0 -31 48 22 4 0 0 -30 9 9 3 38 37 41 243 -38 -29 18 28 -30 59 47 -28 53 6 -31 25 6 5 0 0 -29 44 53 3 38 32 40 243 -38 -28 54 0 -30 35 45 -28 28 32 -31 1 10 6 0 0 -29 19 58 3 38 27 39 242 -37 -28 28 51 -30 11 2 -28 3 16 -30 36 34 7 0 0 -28 54 21 3 38 22 38 242 -36 -28 3 0 -29 45 39 -27 37 19 -30 11 18 8 0 0 -28 28 3 3 38 18 37 241 -35 -27 36 29 -29 19 35 -27 10 41 -29 45 20 9 0 0 -28 1 4 3 38 13 36 241 -34 -27 9 16 -28 52 50 -26 43 21 -29 18 42 10 0 0 -27 33 23 3 38 8 35 240 -33 -26 41 21 -28 25 23 -26 15 18 -28 51 22 11 0 0 -27 5 0 3 38 4 34 240 -32 -26 12 43 -27 57 14 -25 46 34 -28 23 20 12 0 0 -26 35 55 3 37 59 33 240 -31 -25 43 24 -27 28 23 -25 17 7 -27 54 37 13 0 0 -26 6 7 3 37 55 32 239 -30 -25 13 21 -26 58 50 -24 46 57 -27 25 11 14 0 0 -25 35 36 3 37 51 31 239 -29 -24 42 36 -26 28 34 -24 16 4 -26 55 2 15 0 0 -25 4 23 3 37 46 30 238 -28 -24 11 7 -25 57 35 -23 44 28 -26 24 11 16 0 0 -24 32 26 3 37 42 29 238 -27 -23 38 56 -25 25 54 -23 12 9 -25 52 37 17 0 0 -23 59 47 3 37 38 28 238 -26 -23 6 1 -24 53 29 -22 39 7 -25 20 20 18 0 0 -23 26 24 3 37 34 27 237 -25 -22 32 23 -24 20 22 -22 5 21 -24 47 20 19 0 0 -22 52 18 3 37 30 26 237 -24 -21 58 1 -23 46 31 -21 30 52 -24 13 37 20 0 0 -22 17 28 3 37 27 25 236 -23 -21 22 57 -23 11 57 -20 55 39 -23 39 10 21 0 0 -21 41 56 3 37 23 24 236 -22 -20 47 9 -22 36 40 -20 19 44 -23 4 1 22 0 0 -21 5 40 3 37 20 22 236 -21 -20 10 38 -22 0 40 -19 43 5 -22 28 8 23 0 0 -20 28 42 3 37 16 21 235 -20 -19 33 24 -21 23 56 -19 5 43 -21 51 33 24 0 0 -19 51 0 3 37 13 20 235 -19 -18 55 27 -20 46 30 -18 27 39 -21 14 14 25 0 0 -19 12 37 3 37 10 19 235 -18 -18 16 48 -20 8 22 -17 48 52 -20 36 14 26 0 0 -18 33 31 3 37 7 18 234 -17 -17 37 27 -19 29 31 -17 9 23 -19 57 30 27 0 0 -17 53 43 3 37 4 17 234 -16 -16 57 24 -18 49 59 -16 29 13 -19 18 5 28 0 0 -17 13 14 3 37 2 16 234 -14 -16 16 40 -18 9 45 -15 48 21 -18 37 59 29 0 0 -16 32 5 3 36 59 14 234 -13 -15 35 16 -17 28 50 -15 6 49 -17 57 12 30 0 0 -15 50 15 3 36 57 13 233 -12 -14 53 11 -16 47 15 -14 24 38 -17 15 44 31 0 0 -15 7 46 3 36 55 12 233 -11 -14 10 27 -16 5 0 -13 41 47 -16 33 36 32 0 0 -14 24 38 3 36 53 11 233 -10 -13 27 5 -15 22 6 -12 58 17 -15 50 49 33 0 0 -13 40 52 3 36 51 10 233 -9 -12 43 6 -14 38 34 -12 14 11 -15 7 24 34 0 0 -12 56 29 3 36 50 9 232 -8 -11 58 29 -13 54 25 -11 29 27 -14 23 22 35 0 0 -12 11 31 3 36 48 7 232 -6 -11 13 17 -13 9 40 -10 44 9 -13 38 43 36 0 0 -11 25 57 3 36 47 6 232 -5 -10 27 31 -12 24 19 - 9 58 16 -12 53 29 37 0 0 -10 39 51 3 36 46 5 232 -4 - 9 41 12 -11 38 25 - 9 11 50 -12 7 41 38 0 0 - 9 53 11 3 36 45 4 232 -3 - 8 54 20 -10 51 58 - 8 24 53 -11 21 20 39 0 0 - 9 6 1 3 36 45 2 231 -2 - 8 6 59 -10 4 59 - 7 37 25 -10 34 27 40 0 0 - 8 18 22 3 36 44 1 231 0 - 7 19 8 - 9 17 31 - 6 49 29 - 9 47 4 Uncertainty in time = +/- 4 secs [Prediction of 2008 May 26.0] Data for the target star ------------------------ * name: TYC 7915-01613-1 * constellation : Corona Australis * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 49 07.8427 DE: -38 29 23.757 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 10.8 * B mag [mag]: 10.9 * Apparent position with proper motion RA(deg): 282.4398884094 DE(deg): -38.4808939676 * Equation of equinoxes (radians) : 0.000051902520795 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (96) Aegle approx. diameter [km]: 170 approx. diameter ["]: .108 distance from Earth [AU]: 2.16500 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 618 number of rejected observations: 103 time covered by the observations: 1911 Mar 23 - 2008 May 19 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 73° remarks: * orbital elements for (96) Aegle : Mean anomaly = 95.92694379 deg Arg. of pericenter = 207.61513389 deg Long. of node = 321.74309982 deg Inclination = 15.94565842 deg Eccentricity = 0.13241881 Semimajor axis = 3.06192013 AU Perihelion dist = 2.65646430 AU Mag: H = 7.60, G = 0.15 Epoch of elements : MJD 54652.15600000 TDT (2008 Jul 05.156) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 5 96 Aegle 3h 44.5m UT 10.8 18 49 7.843-38 29 23.76TYC 7915-01613-1 10.9 12.3 170 12.3 2.165 -2.633 6.42 -57.3474 -38.492 125.04 22.75 3.7409 0.00706 0.03400 -7.61063 1.57740 0.00022 0.00153 2000 95.5303352008 7 3.00000207.615134321.743100 15.9456580.13241881 3.0619201 2.6564643 7.7 5.00.15 RATE 1.8395580 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.026 82 1.25 0.027 0 54612.5020080705_1613-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 16:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org