FK5/J helio. ecliptic osc. elements (au, days, deg., period=julian yrs):

Transcription

1 JPL/HORIZONS Lovejoy (C/2014 Q2) 2014-Dec-31 13:12:36 Rec #: (+COV) Soln.date: 2014-Dec-23_11:43:30 # obs: 821 (175 days) FK5/J helio. ecliptic osc. elements (au, days, deg., period=julian yrs): EPOCH= != 2014-Nov (CT) RMSW= n.a. EC= QR= TP= OM= W= IN= A= MA= ADIST= PER= N= E-5 ANGMOM= DAN= DDN= L= B= MOID= TP= 2015-Jan Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 8.2 M2= 12.1 k1= 12. k2= 5. PHCOF=.030 COMET comments 1: soln ref.= JPL#15, data arc: to : k1=12., k2=5., phase coef.=0.03; Ephemeris / WWW_USER Wed Dec 31 13:12: Pasadena, USA / Horizons Target body name: Lovejoy (C/2014 Q2) {source: JPL#15} Center body name: Earth (399) {source: DE-0431LE-0431} Center-site name: (user defined site below) Start time : A.D Dec-31 00:00: UT Stop time : A.D Jan-30 00:00: UT Step-size : 180 minutes Target pole/equ : No model available Target radii : (unavailable) Center geodetic : , ,7.112E-13 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: , , {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : High-precision EOP model {East-longitude +} Center radii : x x km {Equator, meridian, pole} Target primary : Sun Vis. interferer : MOON (R_eq= ) km {source: DE-0431LE-0431} Rel. light bend : Sun, EARTH {source: DE-0431LE-0431} Rel. lght bnd GM: E+11, E+05 km^3/s^2 Small-body perts: Yes {source: SB431-BIG16} Atmos refraction: YES (Earth refraction model) RA format : HMS Time format : CAL EOP file : eop p EOP coverage : DATA-BASED 1962-JAN-20 TO 2014-DEC-30. PREDICTS-> 2015-MAR-22 Units conversion: 1 au= km, c= km/s, 1 day= s Comet_Lovejoy_horizons_results_added_Range Page 1 of 5

2 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 ),Local Hour Angle( 0.0=NO ) Initial FK5/J heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= != 2014-Nov (CT) RMSW= n.a. EC= QR= TP= OM= W= IN= Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 8.2 M2= 12.1 k1= 12. k2= 5. PHCOF=.030 ******** $$SOE Date_(UT) HR:MN RA (apparent) DEC (apparent) Azimuth Elevation T-mag N-mag Range Velocity 2015-Jan-08 0:00 N Jan-08 3:00 m Jan-08 6:00 m Jan-08 9:00 m Jan-09 0:00 N Jan-09 3: Jan-09 6:00 m Jan-09 9:00 m Jan-10 0:00 N Jan-10 3: Jan-10 6:00 m Jan-10 9:00 m Jan-11 0:00 N Jan-11 3: Jan-11 6:00 m Jan-11 9:00 m Jan-12 0:00 N Jan-12 3: Jan-12 6:00 m Jan-12 9:00 m Jan-13 0:00 N Jan-13 3: Jan-13 6: Jan-13 9:00 m Jan-14 0:00 N Jan-14 3: Jan-14 6: Jan-14 9:00 m Jan-15 0:00 C Jan-15 3: Jan-15 6: Jan-15 9:00 m Jan-16 0:00 C Jan-16 3: Jan-16 6: Jan-16 9: Jan-17 0:00 C Jan-17 3: Comet_Lovejoy_horizons_results_added_Range Page 2 of 5

3 2015-Jan-17 6: Jan-17 9: Jan-18 0:00 C Jan-18 3: Jan-18 6: Jan-18 9: Jan-19 0:00 C Jan-19 3: Jan-19 6: Jan-19 9: Jan-20 0:00 C Jan-20 3: Jan-20 6: Jan-20 9: Jan-21 0:00 Cm Jan-21 3: Jan-21 6: Jan-21 9: Jan-22 0:00 Cm Jan-22 3: Jan-22 6: Jan-22 9: Jan-23 0:00 Cm Jan-23 3: Jan-23 6: Jan-23 9: Jan-24 0:00 Cm Jan-24 3:00 m Jan-24 6: Jan-24 9: Jan-25 0:00 Cm Jan-25 3:00 m Jan-25 6: Jan-25 9: Jan-26 0:00 Cm Jan-26 3:00 m Jan-26 6:00 m Jan-26 9: Jan-27 0:00 Cm Jan-27 3:00 m Jan-27 6:00 m Jan-27 9: Jan-28 0:00 Cm Jan-28 3:00 m Jan-28 6:00 m Jan-28 9: Jan-29 0:00 Cm Jan-29 3:00 m Jan-29 6:00 m Jan-29 9:00 m Comet_Lovejoy_horizons_results_added_Range Page 3 of 5

4 2015-Jan-30 0:00 Cm $$EOE ****** Column meaning: TIME Prior to 1962, times are UT1. Dates thereafter are UTC. Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D. date. Calendar dates prior to 1582-Oct-15 are in the Julian calendar system. Later calendar dates are in the Gregorian system. Time tags refer to the same instant throughout the universe, regardless of where the observer is located. The dynamical Coordinate Time scale is used internally. It is equivalent to the current IAU definition of "TDB". Conversion between CT and the selected non-uniform UT output scale has not been determined for UTC times after the next July or January 1st. The last known leap-second is used over any future interval. NOTE: "n.a." in output means quantity "not available" at the print-time. SOLAR PRESENCE (OBSERVING SITE) Time tag is followed by a blank, then a solar-presence symbol: '*' Daylight (refracted solar upper-limb on or above apparent horizon) 'C' Civil twilight/dawn 'N' Nautical twilight/dawn 'A' Astronomical twilight/dawn ' ' Night OR geocentric ephemeris LUNAR PRESENCE (OBSERVING SITE) The solar-presence symbol is immediately followed by a lunar-presence symbol: 'm' Refracted upper-limb of Moon on or above apparent horizon ' ' Refracted upper-limb of Moon below apparent horizon OR geocentric ephemeris R.A._(r-apparent) DEC. = Refracted apparent right ascension and declination of the target center with respect to the Earth's true-equator and the meridian containing the Earth true equinox-of-date. Adjusted for light-time, the gravitational deflection of light, stellar aberration, precession, nutation and approximate atmospheric refraction. Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f) Azi_(r-appr)_Elev = Refracted apparent azimuth and elevation of target center. Adjusted for light-time, the gravitational deflection of light, stellar aberration, precession, nutation and approximate atmospheric refraction. Azimuth measured North(0) -> East(90)-> South(180) -> West(270) -> North (360). Elevation is Comet_Lovejoy_horizons_results_added_Range Page 4 of 5

5 with respect to plane perpendicular to local zenith direction. TOPOCENTRIC ONLY. Units: DEGREES T-mag N-mag = Comet's approximate apparent visual total magnitude ("T-mag") and nuclear magnitude ("N-mag") by following standard IAU definitions: T-mag = M1 + 5*log10(delta) + k1*log10(r) N-mag = M2 + 5*log10(delta) + k2*log10(r) + phcof*beta Units: MAGNITUDES delta deldot = Range ("delta") and range-rate ("delta-dot") of target center with respect to the observer at the instant light seen by the observer at print-time would have left the target center (print-time minus down-leg light-time); the distance traveled by a light ray emanating from the center of the target and recorded by the observer at print-time. "deldot" is a projection of the velocity vector along this ray, the light-time-corrected line-of-sight from the coordinate center, and indicates relative motion. A positive "deldot" means the target center is moving away from the observer (coordinate center). A negative deldot means the target center is moving toward the observer. Units: AU and KM/S Computations by... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA USA Information: Connect : telnet://ssd.jpl.nasa.gov:6775 (via browser) telnet ssd.jpl.nasa.gov 6775 (via command-line) Author : Jon.Giorgini@jpl.nasa.gov Comet_Lovejoy_horizons_results_added_Range Page 5 of 5