******************************************************************************* JPL/HORIZONS Larson (C/2009 F1) 2009-Mar-22 06:24:56 Rec #:903706 (+COV) Soln.date: 2009-Mar-19_09:50:03 # obs: 90 (3 days) FK5/J2000.0 helio. eclip. TWO-BODY elements (AU, DAYS, DEG, period=Julian yrs): EPOCH= 2454908.5 != 2009-Mar-18.0000000 (CT) Residual RMS= .43445 EC= .9999999999999939 QR= 1.836883081402993 TP= 2455007.300590044 OM= 357.9233976316162 W= 219.0511352560149 IN= 171.3990283469003 A= 300821307670170.5 MA= 0. ADIST= 9.999999E99 PER= 9.999999E99 N= 0. ANGMOM= .032971385 DAN= 16.44361 DDN= 2.06788 L= 139.18893 B= -5.406421 TP= 2009-Jun-24.8005900 Physical & non-grav parameters (KM, SEC; A1,A2,A3=AU/d^2; DT=days): GM= n.a. RAD= n.a. A1= n.a. A2= n.a. A3= n.a. DT= n.a. M1= 15.5 M2= 17.6 k1= 10. k2= 5. PHCOF= .030 COMET comments 1: soln ref.= JPL#1, data arc: 2009-Mar-16 to 2009-Mar-19 2: k1=10., k2=5., phase coef.=0.03; TWO_BODY; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sun Mar 22 06:24:57 2009 Pasadena, USA / Horizons ******************************************************************************* Target body name: Larson (C/2009 F1) {source: JPL#1} Center body name: Earth (399) {source: DE405} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2009-Mar-21 00:00:00.0000 UT Stop time : A.D. 2009-Mar-23 00:00:00.0000 UT Step-size : 30 minutes ******************************************************************************* Target pole/equ : No model available Target radii : (unavailable) Center geodetic : .000000000,.000000000,.00000000 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: .000000000,.000000000,.00000000 {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 : HMS Time format : CAL EOP file : eop.090319.p090610 EOP coverage : DATA-BASED 1962-JAN-20 TO 2009-MAR-19. PREDICTS-> 2009-JUN-09 Units 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 TWO-BODY elements (AU, DAYS, DEG): EPOCH= 2454908.5 != 2009-Mar-18.0000000 (CT) Residual RMS= .43445 EC= .9999999999999939 QR= 1.836883081402993 TP= 2455007.300590044 OM= 357.9233976316162 W= 219.0511352560149 IN= 171.3990283469003 Comet physical & dynamic parameters (KM, SEC; A1,A2,A3=AU/d^2; DT=days): GM= n.a. RAD= n.a. A1= n.a. A2= n.a. A3= n.a. DT= n.a. M1= 15.5 M2= 17.6 k1= 10. k2= 5. PHCOF= .030 ************************************************************************************************************** Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC T-mag N-mag delta deldot S-O-T /r S-T-O ************************************************************************************************************** $$SOE 2009-Mar-21 00:00 12 44 25.00 -02 17 38.7 19.32 19.86 1.20597204518231 -19.7034241 169.0262 /L 4.9579 2009-Mar-21 00:30 12 44 18.00 -02 17 01.5 19.31 19.86 1.20573518371608 -19.6658587 169.0771 /L 4.9355 2009-Mar-21 01:00 12 44 10.99 -02 16 24.4 19.31 19.86 1.20549877440193 -19.6282723 169.1279 /L 4.9130 2009-Mar-21 01:30 12 44 03.98 -02 15 47.2 19.31 19.86 1.20526281749028 -19.5906653 169.1787 /L 4.8906 2009-Mar-21 02:00 12 43 56.97 -02 15 10.1 19.31 19.85 1.20502731323091 -19.5530374 169.2296 /L 4.8682 2009-Mar-21 02:30 12 43 49.95 -02 14 32.9 19.31 19.85 1.20479226187314 -19.5153889 169.2805 /L 4.8457 2009-Mar-21 03:00 12 43 42.93 -02 13 55.7 19.31 19.85 1.20455766366592 -19.4777197 169.3313 /L 4.8232 2009-Mar-21 03:30 12 43 35.91 -02 13 18.4 19.31 19.85 1.20432351885773 -19.4400299 169.3822 /L 4.8008 2009-Mar-21 04:00 12 43 28.89 -02 12 41.2 19.31 19.85 1.20408982769666 -19.4023194 169.4331 /L 4.7783 2009-Mar-21 04:30 12 43 21.86 -02 12 03.9 19.31 19.85 1.20385659043034 -19.3645884 169.4839 /L 4.7558 2009-Mar-21 05:00 12 43 14.83 -02 11 26.7 19.31 19.85 1.20362380730601 -19.3268369 169.5348 /L 4.7333 2009-Mar-21 05:30 12 43 07.80 -02 10 49.4 19.31 19.85 1.20339147857046 -19.2890649 169.5857 /L 4.7108 2009-Mar-21 06:00 12 43 00.76 -02 10 12.1 19.31 19.84 1.20315960447003 -19.2512724 169.6366 /L 4.6882 2009-Mar-21 06:30 12 42 53.72 -02 09 34.7 19.31 19.84 1.20292818525068 -19.2134595 169.6875 /L 4.6657 2009-Mar-21 07:00 12 42 46.68 -02 08 57.4 19.31 19.84 1.20269722115787 -19.1756262 169.7384 /L 4.6432 2009-Mar-21 07:30 12 42 39.64 -02 08 20.0 19.30 19.84 1.20246671243669 -19.1377725 169.7893 /L 4.6206 2009-Mar-21 08:00 12 42 32.59 -02 07 42.6 19.30 19.84 1.20223665933174 -19.0998986 169.8402 /L 4.5981 2009-Mar-21 08:30 12 42 25.54 -02 07 05.2 19.30 19.84 1.20200706208723 -19.0620043 169.8911 /L 4.5755 2009-Mar-21 09:00 12 42 18.49 -02 06 27.8 19.30 19.84 1.20177792094689 -19.0240899 169.9420 /L 4.5530 2009-Mar-21 09:30 12 42 11.43 -02 05 50.4 19.30 19.84 1.20154923615403 -18.9861552 169.9929 /L 4.5304 2009-Mar-21 10:00 12 42 04.37 -02 05 12.9 19.30 19.83 1.20132100795152 -18.9482003 170.0439 /L 4.5078 2009-Mar-21 10:30 12 41 57.31 -02 04 35.5 19.30 19.83 1.20109323658178 -18.9102254 170.0948 /L 4.4852 2009-Mar-21 11:00 12 41 50.25 -02 03 58.0 19.30 19.83 1.20086592228679 -18.8722303 170.1457 /L 4.4626 2009-Mar-21 11:30 12 41 43.18 -02 03 20.5 19.30 19.83 1.20063906530806 -18.8342152 170.1966 /L 4.4400 2009-Mar-21 12:00 12 41 36.11 -02 02 43.0 19.30 19.83 1.20041266588671 -18.7961800 170.2476 /L 4.4174 2009-Mar-21 12:30 12 41 29.04 -02 02 05.5 19.30 19.83 1.20018672426334 -18.7581249 170.2985 /L 4.3948 2009-Mar-21 13:00 12 41 21.96 -02 01 27.9 19.30 19.83 1.19996124067816 -18.7200498 170.3494 /L 4.3722 2009-Mar-21 13:30 12 41 14.89 -02 00 50.3 19.30 19.83 1.19973621537088 -18.6819548 170.4004 /L 4.3496 2009-Mar-21 14:00 12 41 07.81 -02 00 12.8 19.30 19.83 1.19951164858080 -18.6438400 170.4513 /L 4.3269 2009-Mar-21 14:30 12 41 00.72 -01 59 35.2 19.30 19.82 1.19928754054674 -18.6057053 170.5022 /L 4.3043 2009-Mar-21 15:00 12 40 53.63 -01 58 57.5 19.29 19.82 1.19906389150706 -18.5675508 170.5532 /L 4.2817 2009-Mar-21 15:30 12 40 46.55 -01 58 19.9 19.29 19.82 1.19884070169968 -18.5293766 170.6041 /L 4.2590 2009-Mar-21 16:00 12 40 39.45 -01 57 42.3 19.29 19.82 1.19861797136205 -18.4911826 170.6551 /L 4.2363 2009-Mar-21 16:30 12 40 32.36 -01 57 04.6 19.29 19.82 1.19839570073117 -18.4529690 170.7060 /L 4.2137 2009-Mar-21 17:00 12 40 25.26 -01 56 26.9 19.29 19.82 1.19817389004358 -18.4147357 170.7570 /L 4.1910 2009-Mar-21 17:30 12 40 18.16 -01 55 49.2 19.29 19.82 1.19795253953532 -18.3764829 170.8079 /L 4.1683 2009-Mar-21 18:00 12 40 11.06 -01 55 11.5 19.29 19.82 1.19773164944202 -18.3382104 170.8589 /L 4.1456 2009-Mar-21 18:30 12 40 03.95 -01 54 33.8 19.29 19.81 1.19751121999882 -18.2999185 170.9098 /L 4.1229 2009-Mar-21 19:00 12 39 56.84 -01 53 56.0 19.29 19.81 1.19729125144038 -18.2616070 170.9607 /L 4.1002 2009-Mar-21 19:30 12 39 49.73 -01 53 18.3 19.29 19.81 1.19707174400092 -18.2232761 171.0117 /L 4.0775 2009-Mar-21 20:00 12 39 42.62 -01 52 40.5 19.29 19.81 1.19685269791415 -18.1849258 171.0626 /L 4.0548 2009-Mar-21 20:30 12 39 35.50 -01 52 02.7 19.29 19.81 1.19663411341336 -18.1465562 171.1136 /L 4.0321 2009-Mar-21 21:00 12 39 28.38 -01 51 24.9 19.29 19.81 1.19641599073133 -18.1081672 171.1645 /L 4.0094 2009-Mar-21 21:30 12 39 21.26 -01 50 47.1 19.29 19.81 1.19619833010037 -18.0697589 171.2154 /L 3.9867 2009-Mar-21 22:00 12 39 14.14 -01 50 09.2 19.29 19.81 1.19598113175234 -18.0313314 171.2664 /L 3.9640 2009-Mar-21 22:30 12 39 07.01 -01 49 31.4 19.28 19.80 1.19576439591858 -17.9928846 171.3173 /L 3.9412 2009-Mar-21 23:00 12 38 59.88 -01 48 53.5 19.28 19.80 1.19554812283000 -17.9544187 171.3682 /L 3.9185 2009-Mar-21 23:30 12 38 52.75 -01 48 15.6 19.28 19.80 1.19533231271699 -17.9159337 171.4192 /L 3.8958 2009-Mar-22 00:00 12 38 45.61 -01 47 37.7 19.28 19.80 1.19511696580949 -17.8774295 171.4701 /L 3.8730 2009-Mar-22 00:30 12 38 38.47 -01 46 59.8 19.28 19.80 1.19490208233694 -17.8389063 171.5210 /L 3.8503 2009-Mar-22 01:00 12 38 31.33 -01 46 21.8 19.28 19.80 1.19468766252830 -17.8003641 171.5719 /L 3.8275 2009-Mar-22 01:30 12 38 24.19 -01 45 43.9 19.28 19.80 1.19447370661204 -17.7618030 171.6228 /L 3.8048 2009-Mar-22 02:00 12 38 17.04 -01 45 05.9 19.28 19.80 1.19426021481616 -17.7232229 171.6737 /L 3.7820 2009-Mar-22 02:30 12 38 09.89 -01 44 27.9 19.28 19.79 1.19404718736815 -17.6846239 171.7246 /L 3.7592 2009-Mar-22 03:00 12 38 02.74 -01 43 49.9 19.28 19.79 1.19383462449504 -17.6460060 171.7755 /L 3.7365 2009-Mar-22 03:30 12 37 55.59 -01 43 11.9 19.28 19.79 1.19362252642333 -17.6073694 171.8264 /L 3.7137 2009-Mar-22 04:00 12 37 48.43 -01 42 33.9 19.28 19.79 1.19341089337906 -17.5687140 171.8773 /L 3.6909 2009-Mar-22 04:30 12 37 41.27 -01 41 55.8 19.28 19.79 1.19319972558777 -17.5300398 171.9282 /L 3.6682 2009-Mar-22 05:00 12 37 34.11 -01 41 17.8 19.28 19.79 1.19298902327448 -17.4913470 171.9791 /L 3.6454 2009-Mar-22 05:30 12 37 26.94 -01 40 39.7 19.28 19.79 1.19277878666378 -17.4526356 172.0299 /L 3.6226 2009-Mar-22 06:00 12 37 19.77 -01 40 01.6 19.27 19.79 1.19256901597968 -17.4139055 172.0808 /L 3.5998 2009-Mar-22 06:30 12 37 12.60 -01 39 23.5 19.27 19.79 1.19235971144574 -17.3751569 172.1317 /L 3.5771 2009-Mar-22 07:00 12 37 05.43 -01 38 45.4 19.27 19.78 1.19215087328501 -17.3363897 172.1825 /L 3.5543 2009-Mar-22 07:30 12 36 58.25 -01 38 07.2 19.27 19.78 1.19194250172003 -17.2976041 172.2333 /L 3.5315 2009-Mar-22 08:00 12 36 51.08 -01 37 29.1 19.27 19.78 1.19173459697286 -17.2588001 172.2842 /L 3.5087 2009-Mar-22 08:30 12 36 43.90 -01 36 50.9 19.27 19.78 1.19152715926503 -17.2199776 172.3350 /L 3.4859 2009-Mar-22 09:00 12 36 36.71 -01 36 12.7 19.27 19.78 1.19132018881757 -17.1811368 172.3858 /L 3.4631 2009-Mar-22 09:30 12 36 29.53 -01 35 34.5 19.27 19.78 1.19111368585101 -17.1422777 172.4366 /L 3.4403 2009-Mar-22 10:00 12 36 22.34 -01 34 56.3 19.27 19.78 1.19090765058538 -17.1034003 172.4874 /L 3.4175 2009-Mar-22 10:30 12 36 15.15 -01 34 18.1 19.27 19.78 1.19070208324018 -17.0645047 172.5381 /L 3.3948 2009-Mar-22 11:00 12 36 07.95 -01 33 39.8 19.27 19.77 1.19049698403441 -17.0255910 172.5889 /L 3.3720 2009-Mar-22 11:30 12 36 00.76 -01 33 01.5 19.27 19.77 1.19029235318655 -16.9866590 172.6397 /L 3.3492 2009-Mar-22 12:00 12 35 53.56 -01 32 23.3 19.27 19.77 1.19008819091457 -16.9477090 172.6904 /L 3.3264 2009-Mar-22 12:30 12 35 46.36 -01 31 45.0 19.27 19.77 1.18988449743593 -16.9087410 172.7411 /L 3.3036 2009-Mar-22 13:00 12 35 39.15 -01 31 06.7 19.27 19.77 1.18968127296758 -16.8697549 172.7918 /L 3.2808 2009-Mar-22 13:30 12 35 31.95 -01 30 28.4 19.26 19.77 1.18947851772592 -16.8307508 172.8425 /L 3.2580 2009-Mar-22 14:00 12 35 24.74 -01 29 50.0 19.26 19.77 1.18927623192686 -16.7917289 172.8932 /L 3.2352 2009-Mar-22 14:30 12 35 17.53 -01 29 11.7 19.26 19.77 1.18907441578578 -16.7526890 172.9439 /L 3.2125 2009-Mar-22 15:00 12 35 10.31 -01 28 33.3 19.26 19.76 1.18887306951754 -16.7136313 172.9945 /L 3.1897 2009-Mar-22 15:30 12 35 03.09 -01 27 54.9 19.26 19.76 1.18867219333648 -16.6745559 173.0451 /L 3.1669 2009-Mar-22 16:00 12 34 55.88 -01 27 16.5 19.26 19.76 1.18847178745641 -16.6354626 173.0958 /L 3.1441 2009-Mar-22 16:30 12 34 48.65 -01 26 38.1 19.26 19.76 1.18827185209060 -16.5963517 173.1464 /L 3.1214 2009-Mar-22 17:00 12 34 41.43 -01 25 59.7 19.26 19.76 1.18807238745181 -16.5572231 173.1969 /L 3.0986 2009-Mar-22 17:30 12 34 34.20 -01 25 21.3 19.26 19.76 1.18787339375229 -16.5180769 173.2475 /L 3.0758 2009-Mar-22 18:00 12 34 26.97 -01 24 42.8 19.26 19.76 1.18767487120370 -16.4789131 173.2980 /L 3.0531 2009-Mar-22 18:30 12 34 19.74 -01 24 04.3 19.26 19.76 1.18747682001724 -16.4397318 173.3485 /L 3.0303 2009-Mar-22 19:00 12 34 12.51 -01 23 25.9 19.26 19.76 1.18727924040352 -16.4005330 173.3990 /L 3.0076 2009-Mar-22 19:30 12 34 05.27 -01 22 47.4 19.26 19.75 1.18708213257264 -16.3613167 173.4495 /L 2.9848 2009-Mar-22 20:00 12 33 58.03 -01 22 08.8 19.26 19.75 1.18688549673417 -16.3220831 173.4999 /L 2.9621 2009-Mar-22 20:30 12 33 50.79 -01 21 30.3 19.26 19.75 1.18668933309714 -16.2828321 173.5504 /L 2.9393 2009-Mar-22 21:00 12 33 43.54 -01 20 51.8 19.26 19.75 1.18649364187002 -16.2435638 173.6008 /L 2.9166 2009-Mar-22 21:30 12 33 36.30 -01 20 13.2 19.25 19.75 1.18629842326076 -16.2042782 173.6511 /L 2.8939 2009-Mar-22 22:00 12 33 29.05 -01 19 34.7 19.25 19.75 1.18610367747677 -16.1649755 173.7015 /L 2.8712 2009-Mar-22 22:30 12 33 21.80 -01 18 56.1 19.25 19.75 1.18590940472492 -16.1256555 173.7518 /L 2.8485 2009-Mar-22 23:00 12 33 14.54 -01 18 17.5 19.25 19.75 1.18571560521152 -16.0863184 173.8021 /L 2.8258 2009-Mar-22 23:30 12 33 07.28 -01 17 38.9 19.25 19.74 1.18552227914234 -16.0469643 173.8523 /L 2.8031 2009-Mar-23 00:00 12 33 00.03 -01 17 00.2 19.25 19.74 1.18532942672262 -16.0075931 173.9026 /L 2.7804 $$EOE ************************************************************************************************************** Column meaning: ** WARNING ** The initial state available for this object was a Keplerian two-body orbital element set, not osculating elements. This means the orbit is probably very poorly determined. Predictions for times many months or years from the epoch may not be suitable for high-accuracy applications or expectations. Since the epoch is inside or within ~30 days of the relatively short data arc, the elements (such as they are) were numerically propagated with perturbations, just as if they were osculating elements. 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. The uniform Coordinate Time scale is used internally. 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. R.A._(ICRF/J2000.0)_DEC = J2000.0 astrometric right ascension and declination of target center. Corrected for light-time. Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f) T-mag N-mag = Comet's approximate apparent visual total magnitude ("T-mag") and nuclear magnitude ("N-mag") by following definitions: T-mag = M1 + 5*log10(delta) + k1*log10(r) N-mag = M2 + 5*log10(delta) + k2*log10(r) + phcof*beta Units: none 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 is a Sun-relative code, output for observing sites with defined rotation models only. /T indicates target trails Sun (evening sky) /L indicates target leads Sun (morning sky) NOTE: The S-O-T solar elongation angle is the total separation in any direction. It does not indicate the angle of Sun leading or trailing. S-T-O = Sun-Target-Observer (~ PHASE ANGLE) angle: the vertex angle at target center formed by a vector to the apparent center of the Sun and a vector intersecting the observer at print-time. This measurable angle is within 20 arcseconds (0.006 deg) of the reduced PHASE ANGLE at observer's location at print time. The difference is due to down-leg stellar aberration affecting measured target position but not apparent solar illumination direction. When computing phase, Horizons uses the true phase angle, not S-T-O, but the resulting difference in illuminated fraction is less than 0.001%. Units: DEGREES 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 **************************************************************************************************************