本帖最后由 suhuasky 于 2009-3-26 00:57 编辑
小行星:2009FD
计算地点:新疆乌鲁木齐星明天文台
HORIZONS Web-Interface
Current SettingsEphemeris Type [change] : | OBSERVER | Target Body [change] : | Asteroid (2009 FD) | Observer Location [change] : | user defined ( 87°10'39.6''E, 43°28'15.0''N, 2080 m ) | Time Span [change] : | Start=2009-03-27, Stop=2009-03-28, Step=1 h | Table Settings [change] : | defaults | Display/Output [change] : | default (formatted HTML) | Object Data PageJPL/HORIZONS (2009 FD) 2009-Mar-25 09:50:34Rec #:638646 (+COV) Soln.date: 2009-Mar-25_00:50:14 # obs: 146 (29 days) FK5/J2000.0 helio. ecliptic osc. elements (AU, DAYS, DEG, period=Julian yrs): EPOCH= 2454910.5 ! 2009-Mar-20.00 (CT) Residual RMS= .41744 EC= .4935406750961884 QR= .5923308026221817 TP= 2454976.74299611 OM= 9.712864535137053 W= 280.6940015311131 IN= 3.05052191712165 A= 1.169552565222645 MA= 308.3804252885625 ADIST= 1.746774327823108 PER= 1.26485 N= .779245773 ANGMOM= .016179762 DAN= .81045 DDN= .9738599999999999 L= 290.4216903 B= -2.9974923 TP= 2009-May-25.2429961 Physical parameters (KM, SEC, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 22.19 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ASTEROID comments: 1: soln ref.= JPL#7, OCC=62: source=ORB | Results*******************************************************************************Ephemeris / WWW_USER Wed Mar 25 09:50:35 2009 Pasadena, USA / Horizons *******************************************************************************Target body name: (2009 FD) {source: JPL#7}Center body name: Earth (399) {source: DE405}Center-site name: (user defined site below)*******************************************************************************Start time : A.D. 2009-Mar-27 00:00:00.0000 UT Stop time : A.D. 2009-Mar-28 00:00:00.0000 UT Step-size : 60 minutes*******************************************************************************Target pole/equ : No model availableTarget radii : (unavailable) Center geodetic : 87.1776667,43.4708811,2.0795109 {E-lon(deg),Lat(deg),Alt(km)}Center cylindric: 87.1776667,4637.63184,4367.0416 {E-lon(deg),Dxy(km),Dz(km)}Center pole/equ : High-precision EOP model {East-longitude +}Center radii : 6378.1 x 6378.1 x 6356.8 km {Equator, meridian, pole} Target primary : Sun {source: DE405}Interfering body: MOON (Req= 1737.400) km {source: DE405}Deflecting body : Sun, EARTH {source: DE405}Deflecting GMs : 1.3271E+11, 3.9860E+05 km^3/s^2 Small perturbers: Ceres, Pallas, Vesta {source: SB405-CPV-2}Small body GMs : 6.32E+01, 1.43E+01, 1.78E+01 km^3/s^2 Atmos refraction: NO (AIRLESS)RA format : HMSTime format : CAL EOP file : eop.090324.p090615 EOP coverage : DATA-BASED 1962-JAN-20 TO 2009-MAR-24. PREDICTS-> 2009-JUN-14Units conversion: 1 AU= 149597870.691 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO )Table cut-offs 2: Solar Elongation ( 0.0,180.0=NO ) *******************************************************************************Initial FK5/J2000.0 heliocentric ecliptic osculating elements (AU, DAYS, DEG): EPOCH= 2454910.5 ! 2009-Mar-20.00 (CT) Residual RMS= .41744 EC= .4935406750961884 QR= .5923308026221817 TP= 2454976.74299611 OM= 9.712864535137053 W= 280.6940015311131 IN= 3.05052191712165 Asteroid physical parameters (KM, SEC, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 22.19 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. |
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