******************************************************************************* JPL/HORIZONS 252P/LINEAR 2016-Mar-28 10:08:57 Rec #:901080 Soln.date: 2016-Mar-22_12:20:22 # obs: 312 (2000-2016) FK5/J2000.0 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457267.5 ! 2015-Sep-02.0000000 (TDB) RMSW= n.a. EC= .6736191844623731 QR= .9961224854335894 TP= 2457462.7838664749 OM= 190.9812176013072 W= 343.2903535745651 IN= 10.4046082714316 A= 3.052025235590942 MA= 323.90157458593 ADIST= 5.107927985748295 PER= 5.3320031182414 N= .184851033 ANGMOM= .022210899 DAN= 1.01334 DDN= 4.69846 L= 174.5313736 B= -2.9764736 MOID= .0137692 TP= 2016-Mar-15.2838664749 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 19.7 M2= 22.7 k1= 16. k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 56.63988 A1= 1.544111818075E-9 A2= -3.490897268057E-10 A3= -9.519939310849E-11 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#45, data arc: 2000-04-07 to 2016-03-22 2: k1=16., k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Mon Mar 28 10:08:57 2016 Pasadena, USA / Horizons ******************************************************************************* Target body name: 252P/LINEAR {source: JPL#45} Center body name: Earth (399) {source: DE431} Center-site name: (user defined site below) ******************************************************************************* Start time : A.D. 2016-Mar-28 01:30:00.0000 UT Stop time : A.D. 2016-Apr-27 00:00:00.0000 UT Step-size : 1440 minutes ******************************************************************************* Target pole/equ : No model available Target radii : (unavailable) Center geodetic : 21.0833000,52.5834000,0.0000000 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 21.0833000,3883.60289,5042.5089 {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 Vis. interferer : MOON (R_eq= 1737.400) km {source: DE431} Rel. light bend : Sun, EARTH {source: DE431} Rel. lght bnd GM: 1.3271E+11, 3.9860E+05 km^3/s^2 Small-body perts: Yes {source: SB431-BIG16} Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL EOP file : eop.160325.p160616 EOP coverage : DATA-BASED 1962-JAN-20 TO 2016-MAR-25. PREDICTS-> 2016-JUN-15 Units conversion: 1 au= 149597870.700 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 ),Local Hour Angle( 0.0=NO ) ******************************************************************************* Initial FK5/J2000.0 heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= 2457267.5 ! 2015-Sep-02.0000000 (TDB) RMSW= n.a. EC= .6736191844623731 QR= .9961224854335894 TP= 2457462.7838664749 OM= 190.9812176013072 W= 343.2903535745651 IN= 10.4046082714316 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 19.7 M2= 22.7 k1= 16. k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 56.63988 A1= 1.544111818075E-9 A2= -3.490897268057E-10 A3= -9.519939310849E-11 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ************************************************************************************************************************************* Date__(UT)__HR:MN R.A.__(a-apparent)__DEC Azi_(a-appr)_Elev T-mag N-mag delta deldot S-O-T /r S-T-O Cnst ************************************************************************************************************************************* $$SOE 2016-Mar-28 01:30 m 17 32 49.62 -24 54 51.3 149.5104 7.1095 13.41 18.55 0.05314166767098 7.6052845 103.9594 /L 73.1218 Oph 2016-Mar-29 01:30 m 17 33 34.03 -20 51 15.6 148.8228 11.1797 13.61 18.70 0.05775384227292 8.0623807 104.9582 /L 71.8917 Oph 2016-Mar-30 01:30 m 17 34 06.79 -17 24 29.0 148.4137 14.6955 13.80 18.84 0.06259859074365 8.4147948 105.9016 /L 70.7086 Oph 2016-Mar-31 01:30 m 17 34 30.52 -14 27 53.8 148.2341 17.7548 13.99 18.98 0.06762235966867 8.6879636 106.8056 /L 69.5597 Ser 2016-Apr-01 01:30 m 17 34 46.96 -11 56 02.1 148.2466 20.4386 14.17 19.11 0.07278463690952 8.9011083 107.6821 /L 68.4358 Ser 2016-Apr-02 01:30 m 17 34 57.31 -09 44 29.4 148.4224 22.8128 14.35 19.24 0.07805469734991 9.0686116 108.5397 /L 67.3303 Oph 2016-Apr-03 01:30 17 35 02.41 -07 49 43.8 148.7392 24.9301 14.52 19.36 0.08340913121363 9.2012474 109.3848 /L 66.2386 Oph 2016-Apr-04 01:30 17 35 02.87 -06 08 56.1 149.1795 26.8323 14.68 19.47 0.08883002024913 9.3071435 110.2220 /L 65.1572 Oph 2016-Apr-05 01:30 17 34 59.17 -04 39 50.6 149.7293 28.5530 14.83 19.58 0.09430360344001 9.3924875 111.0546 /L 64.0841 Oph 2016-Apr-06 01:30 17 34 51.67 -03 20 38.5 150.3774 30.1190 14.98 19.68 0.09981929466097 9.4620261 111.8849 /L 63.0178 Oph 2016-Apr-07 01:30 17 34 40.65 -02 09 51.5 151.1146 31.5517 15.13 19.77 0.10536894625709 9.5194108 112.7145 /L 61.9572 Oph 2016-Apr-08 01:30 17 34 26.36 -01 06 17.8 151.9335 32.8683 15.27 19.86 0.11094628437994 9.5674447 113.5445 /L 60.9019 Oph 2016-Apr-09 01:30 17 34 09.02 -00 08 58.7 152.8277 34.0830 15.41 19.94 0.11654647040582 9.6082715 114.3758 /L 59.8517 Oph 2016-Apr-10 01:30 17 33 48.81 +00 42 54.4 153.7918 35.2069 15.54 20.02 0.12216576401479 9.6435359 115.2088 /L 58.8064 Oph 2016-Apr-11 01:30 17 33 25.91 +01 30 01.7 154.8214 36.2493 15.67 20.10 0.12780127396503 9.6745238 116.0437 /L 57.7661 Oph 2016-Apr-12 01:30 17 33 00.43 +02 12 57.1 155.9123 37.2178 15.79 20.17 0.13345078314630 9.7022759 116.8807 /L 56.7311 Oph 2016-Apr-13 01:30 17 32 32.52 +02 52 09.0 157.0613 38.1187 15.92 20.24 0.13911263107167 9.7276708 117.7199 /L 55.7014 Oph 2016-Apr-14 01:30 A 17 32 02.27 +03 28 01.5 158.2651 38.9572 16.04 20.31 0.14478563567470 9.7514776 118.5611 /L 54.6775 Oph 2016-Apr-15 01:30 A 17 31 29.76 +04 00 55.1 159.5212 39.7374 16.16 20.37 0.15046903899856 9.7743868 119.4044 /L 53.6594 Oph 2016-Apr-16 01:30 A 17 30 55.06 +04 31 07.4 160.8268 40.4628 16.27 20.44 0.15616246627437 9.7970264 120.2497 /L 52.6474 Oph 2016-Apr-17 01:30 Am 17 30 18.25 +04 58 53.4 162.1797 41.1365 16.38 20.49 0.16186589254411 9.8199720 121.0968 /L 51.6417 Oph 2016-Apr-18 01:30 Am 17 29 39.38 +05 24 26.2 163.5776 41.7606 16.50 20.55 0.16757961417224 9.8437539 121.9455 /L 50.6426 Oph 2016-Apr-19 01:30 Am 17 28 58.51 +05 47 57.1 165.0183 42.3372 16.61 20.61 0.17330422427914 9.8688635 122.7958 /L 49.6504 Oph 2016-Apr-20 01:30 Am 17 28 15.69 +06 09 35.7 166.4997 42.8678 16.71 20.66 0.17904059178215 9.8957590 123.6473 /L 48.6653 Oph 2016-Apr-21 01:30 Am 17 27 30.96 +06 29 30.6 168.0194 43.3538 16.82 20.71 0.18478984381691 9.9248711 124.4999 /L 47.6874 Oph 2016-Apr-22 01:30 Am 17 26 44.38 +06 47 49.2 169.5753 43.7961 16.93 20.76 0.19055335116218 9.9566076 125.3531 /L 46.7173 Oph 2016-Apr-23 01:30 Am 17 25 56.01 +07 04 38.2 171.1650 44.1955 17.03 20.81 0.19633271610409 9.9913570 126.2067 /L 45.7550 Oph 2016-Apr-24 01:30 Am 17 25 05.89 +07 20 03.1 172.7862 44.5528 17.13 20.85 0.20212976206931 10.0294910 127.0603 /L 44.8009 Oph 2016-Apr-25 01:30 Am 17 24 14.07 +07 34 09.1 174.4362 44.8685 17.23 20.90 0.20794652438579 10.0713660 127.9134 /L 43.8554 Oph 2016-Apr-26 01:30 Am 17 23 20.62 +07 47 00.6 176.1125 45.1431 17.33 20.95 0.21378524169367 10.1173236 128.7656 /L 42.9188 Oph $$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 solar system, regardless of where the observer is located. For example, if an observation from the surface of another body has an output time-tag of 12:31:00 UTC, an Earth-based time-scale, it refers to the instant on that body simultaneous to 12:31:00 UTC on Earth. The Barycentric Dynamical Time scale (TDB) is used internally as defined by the planetary equations of motion. Conversion between TDB and the selected non-uniform UT output time-scale has not been determined for UTC times after the next July or January 1st. The last known leap-second is used as a constant over future intervals. 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._(a-apparent)__DEC. = Airless apparent right ascension and declination of the target center with respect to the Earth true-equator and the meridian containing the Earth true equinox of date. Adjusted for light-time, gravitational deflection of light, stellar aberration, precession & nutation. Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f) Azi_(a-appr)_Elev = Airless apparent azimuth and elevation of target center. Adjusted for light-time, the gravitational deflection of light, stellar aberration, precession and nutation. Azimuth measured North(0) -> East(90) -> South(180) -> West(270) -> North (360). Elevation is 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 S-O-T /r = Sun-Observer-Target angle; target's apparent solar elongation seen from observer location at print-time. If negative, the target center is behind the Sun. Angular units: DEGREES. The '/r' column indicates target apparent position relative to the Sun in the observer's sky, as described below: For an observing location on the surface of a rotating body: /T indicates target trails Sun (evening sky) /L indicates target leads Sun (morning sky) For an observing point not on a rotating body (such as a spacecraft): /T indicates target trails Sun (RA_target - RA_sun < 0, 'west of Sun') /L indicates target leads Sun (RA_target - RA_sun > 0, 'east of Sun') NOTE: The S-O-T solar elongation angle is the minimum separation angle of the Sun and target in any direction. It does not indicate the separation in the leading or trailing directions. S-T-O = "S-T-O" is the Sun->Target->Observer angle; the interior vertex angle at target center formed by a vector to the apparent center of the Sun at reflection time on the target and the apparent vector to the observer at print-time. Slightly different from true PHASE ANGLE (requestable separately) at the few arcsecond level in that it includes stellar aberration on the down-leg from target to observer. Units: DEGREES Cnst = Constellation ID; the 3-letter abbreviation for the name of the constellation containing the target center's astrometric position, as defined by IAU (1930) boundary delineation. See documentation for list of abbreviations. Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA Information: http://ssd.jpl.nasa.gov/ Connect : telnet://ssd.jpl.nasa.gov:6775 (via browser) telnet ssd.jpl.nasa.gov 6775 (via command-line) Author : Jon.Giorgini@jpl.nasa.gov *************************************************************************************************************************************