本帖最后由 苍穹旋律 于 2011-10-5 15:30 编辑
Calsky User Site, China WGS84: Lon: +116d32m34.8s Lat: +36d12m50.4s Alt: 65m All times in CST Wednesday 5 October 2011 18h37m01s Tiangong-1 Appears 18h32m10s 9.5mag az:295.4° WNW horizon Culmination 18h37m01s 2.9mag az: 25.8° NNE h:89.5° distance: 338.6km height above Earth: 338.7km elevation of Sun: -10° angular velocity: 1.33°/s Disappears 18h39m25s 4.9mag az:116.2° ESE h:13.7° Calculated based on observations on 4. Oct 2011 12:14 CST. The Calculated Sky
Time: 2011 October 5 Wednesday, 18h 32m 10s JD: 2455839.9390067 TDT: 2455839.9397765 deltaT: 66.51 sec Apparent sidereal time: Local: 19h 13m 22.934s Greenwich: 11h 27m 12.614s (All times in CST, UTC+08:00, topocentric data for User Site, China) Satellite Visibility Status: Satellite is in sunlight and above your horizon, and visible This object is hard to be seen; you will need a telescope! Interfering factors: Elevation of Sun: -8.6° (nautical twilight) Elevation of Moon: 34.7° (1.3 days past First Quarter) Geocentric Satellite Tracking: Orbit: Shape = 334.8 km x 352.4 km, Period = 91.4 min, Inclination = 42.8° Revolutions since launch = 92.3, satellite currently descending Ground track: Sub-Satel: Lon = 94°09'22" Lat = +42°01'57" Height= 338.32 km Direction:Az = 100.22 ° Ground Velocity: V = 6.99 km/s Repeat cycle: 25 days with 387 orbits (Error from exact cycle = 0.4 min) Topocentric: Magnitude: 9.5 mag Constellation: Coma Berenices (Com) Altazimuth: Az = 295.35° WNW Alt = +0.48° r = 2105.51 km Apparent: R.A. = 12h12m25s Dec = +20°30'44" r = 2105.51 km Angular velocity: vAng = 0.06 °/s Phase: F = 0.05 (illuminated fraction) Elongation from Sun center: 26.33° (Sun below horizon) Elongation from Moon center: 119.86° Next local pass: Rise: 18h32m10s Magnitude: 9.5mag Altazimuth: Az = 295.35° WNW Alt = +0.48° r = 2105.56 km Culmination: 18h37m01s Magnitude: 2.9mag Altazimuth: Az = 25.75° NNE Alt = +89.51° r = 338.63 km Set: 18h41m53s Magnitude: (invisible) Altazimuth: Az = 116.65° ESE Alt = +0.48° r = 2107.87 km Visibility of this pass: Appears: 18h32m10s (rises on the horizon) Magnitude: 9.5mag Altazimuth: Az = 295.35° WNW Alt = +0.48° r = 2105.56 km Culmination: 18h37m01s Magnitude: 2.9mag Altazimuth: Az = 25.75° NNE Alt = +89.51° r = 338.63 km Disappears: 18h39m25s (satellite enters Earth's shadow and gets eclipsed) Magnitude: 4.9mag Altazimuth: Az = 116.24° ESE Alt = +13.74° r = 1082.97 km HA Whole Sky Chart This chart shows the path of the satellite across the sky. Please note that East and West are NOT the "wrong way round" if you hold the chart over your head to correspond to the view of the sky.
Pass Details Date: Wednesday, 05 October, 2011 Satellite: Tiangong 1 Observer's Location: Unspecified ( 36.2140°N, 116.5430°E) Local Time: China Standard Time (GMT + 8:00) Orbit: 335 x 353 km, 42.8° (Epoch 04 Oct) Sun altitude at time of maximum pass altitude: -9.7° Event Time Altitude Azimuth Distance (km) Rises above horizon 18:32:10 0° 295° (WNW) 2,106 Reaches 10° altitude 18:34:10 10° 296° (WNW) 1,272 Maximum altitude 18:37:02 89° 50° (NE ) 339 Enters shadow 18:39:20 14° 116° (ESE) 1,051 Detailed Star Chart
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