******************************************************************************* JPL/HORIZONS ATLAS (C/2025 N1) 2026-Feb-18 23:04:39 Rec #:90004923 (+COV) Soln.date: 2026-Feb-18_12:56:02 # obs: 781 (2025-2026) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2461089.5 ! 2026-Feb-18.0000000 (TDB) RMSW= n.a. EC= 6.141279068052924 QR= 1.356482097431399 TP= 2460977.9945230768 OM= 322.1682368937277 W= 128.0214407114065 IN= 175.1162017874435 A= -.2638413669976328 MA= 90.93480544622253 ADIST= 9.999999E99 PER= 9.999999E99 N= 7.272600663 ANGMOM= .053539767 DAN= -3.48108 DDN= 2.0254 L= 194.0456303 B= 3.8455895 MOID= .36464801 TP= 2025-Oct-29.4945230768 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 12.5 M2= n.a. k1= 4.5 k2= n.a. PHCOF= n.a. Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 9.181764 A1= 5.289910316467E-8 A2= 1.199500203133E-8 A3= -6.680982112885E-9 Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 0. R0= 1. COMET comments 1: soln ref.= JPL#53, data arc: 2025-05-15 to 2026-02-18 2: k1=4.5;Nongravitational accels. using g(r) = (1 au/ r)^2 for CO2 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Wed Feb 18 23:04:39 2026 Pasadena, USA / Horizons ******************************************************************************* Target body name: ATLAS (C/2025 N1) {source: JPL#53} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2025-Dec-19 05:57:32.6260 UT Stop time : A.D. 2025-Dec-19 06:06:00.0000 UT Step-size : 1 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -6378.137 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : ITRF93 {East-longitude positive} Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441} Rel. light bend : Sun {source: DE441} Rel. lght bnd GM: 1.3271E+11 km^3/s^2 Small-body perts: Yes {source: SB441-N16} Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL Calendar mode : Mixed Julian/Gregorian EOP file : eop.260218.p260517 EOP coverage : DATA-BASED 1962-JAN-20 TO 2026-FEB-18. PREDICTS-> 2026-MAY-16 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 ) Table cut-offs 3: RA/DEC angular rate ( 0.0=NO ) ******************************************************************************* Initial IAU76/J2000 heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= 2461089.5 ! 2026-Feb-18.0000000 (TDB) RMSW= n.a. EC= 6.141279068052924 QR= 1.356482097431399 TP= 2460977.9945230768 OM= 322.1682368937277 W= 128.0214407114065 IN= 175.1162017874435 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.875069008569367E+00 Y= 3.523538407460162E+00 Z= 1.357245598323175E+00 VX=-3.400589036089382E-03 VY= 3.325614487236304E-02 VZ= 1.201663007415534E-02 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 12.5 M2= n.a. k1= 4.5 k2= n.a. PHCOF= n.a. Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 9.181764 A1= 5.289910316467E-8 A2= 1.199500203133E-8 A3= -6.680982112885E-9 Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 0. R0= 1. *************************************************************************************************************************** Date__(UT)__HR:MN:SC.fff r rdot S-O-T /r delta deldot RNG_3sigma RNGRT_3sig *************************************************************************************************************************** $$SOE 2025-Dec-19 05:57:32.626 2.287158283402 49.9475316 106.9489 /L 1.79755373654017 -0.0037881 813.2654 0.0000985 2025-Dec-19 05:58:32.626 2.287178316164 49.9477516 106.9504 /L 1.79755373522748 -0.0027584 813.2682 0.0000985 2025-Dec-19 05:59:32.626 2.287198349013 49.9479716 106.9520 /L 1.79755373432774 -0.0017287 813.2709 0.0000985 2025-Dec-19 06:00:32.626 2.287218381951 49.9481916 106.9536 /L 1.79755373384095 -0.0006990 813.2736 0.0000985 2025-Dec-19 06:01:32.626 2.287238414977 49.9484116 106.9551 /L 1.79755373376713 0.0003308 813.2764 0.0000985 2025-Dec-19 06:02:32.626 2.287258448091 49.9486316 106.9567 /L 1.79755373410628 0.0013606 813.2791 0.0000985 2025-Dec-19 06:03:32.626 2.287278481293 49.9488515 106.9582 /L 1.79755373485841 0.0023904 813.2818 0.0000985 2025-Dec-19 06:04:32.626 2.287298514583 49.9490715 106.9598 /L 1.79755373602352 0.0034202 813.2846 0.0000985 2025-Dec-19 06:05:32.626 2.287318547962 49.9492915 106.9613 /L 1.79755373760164 0.0044500 813.2873 0.0000985 $$EOE *************************************************************************************************************************** Column meaning: TIME Times PRIOR to 1962 are UT1, a mean-solar time closely related to the prior but now-deprecated GMT. Times AFTER 1962 are in UTC, the current civil or "wall-clock" time-scale. UTC is kept within 0.9 seconds of UT1 using integer leap-seconds for 1972 and later years. Conversion from the internal Barycentric Dynamical Time (TDB) of solar system dynamics to the non-uniform civil UT time-scale requested for output has not been determined for UTC times after the next July or January 1st. Therefore, the last known leap-second is used as a constant over future intervals. Time tags refer to the UT time-scale conversion from TDB on Earth regardless of observer location within the solar system, although clock rates may differ due to the local gravity field and no analog to "UT" may be defined for that location. Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D. date. CALENDAR SYSTEM Mixed calendar mode was active such that calendar dates after AD 1582-Oct-15 (if any) are in the modern Gregorian system. Dates prior to 1582-Oct-5 (if any) are in the Julian calendar system, which is automatically extended for dates prior to its adoption on 45-Jan-1 BC. The Julian calendar is useful for matching historical dates. The Gregorian calendar more accurately corresponds to the Earth's orbital motion and seasons. A "Gregorian-only" calendar mode is available if such physical events are the primary interest. NOTE: "n.a." in output means quantity "not available" at the print-time. STATISTICAL UNCERTAINTIES Output includes formal +/- 3 standard-deviation statistical orbit uncertainty quantities. There is a 99.7% (1-D) or 98.9% (2-D) chance the actual value is within given bounds. These statistical calculations assume observational data errors are random. If there are systematic biases (such as timing, reduction or star-catalog errors), results can be optimistic. Because the epoch covariance is mapped using linearized variational partial derivatives, results can also be optimistic for times far from the solution epoch, particularly for objects having close planetary encounters. 'r rdot' = The Sun's apparent range ("r", light-time aberrated) and range-rate ("rdot") relative to the target center, as seen by the observer. A positive "rdot" means the target center was moving away from the Sun, negative means moving toward the Sun. Units: AU and KM/S 'S-O-T /r' = Sun-Observer-Target apparent SOLAR ELONGATION ANGLE seen from the observers' location at print-time. The '/r' column provides a code indicating the targets' apparent position relative to the Sun in the observers' sky, as described below: Case A: For an observing location on the surface of a rotating body, that body rotational sense is considered: /T indicates target TRAILS Sun (evening sky: rises and sets AFTER Sun) /L indicates target LEADS Sun (morning sky: rises and sets BEFORE Sun) Case B: For an observing point that does not have a rotational model (such as a spacecraft), the "leading" and "trailing" condition is defined by the observers' heliocentric ORBITAL motion: * If continuing in the observers' current direction of heliocentric motion would encounter the targets' apparent longitude first, followed by the Sun's, the target LEADS the Sun as seen by the observer. * If the Sun's apparent longitude would be encountered first, followed by the targets', the target TRAILS the Sun. Two other codes can be output: /* indicates observer is Sun-centered (undefined) /? Target is aligned with Sun center (no lead or trail) The S-O-T solar elongation angle is numerically the minimum separation angle of the Sun and target in the sky in any direction. It does NOT indicate the amount of separation in the leading or trailing directions, which would be defined along the equator of a spherical coordinate system. Units: DEGREES 'delta deldot' = Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot") of the target center relative to the observer. A positive "deldot" means the target center is moving away from the observer, negative indicates movement toward the observer. Units: AU and KM/S 'RNG_3sigma RNGRT_3sig' = Range and range rate (radial velocity) formal 3-standard-deviation uncertainties. Units: KM, KM/S Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA General site: https://ssd.jpl.nasa.gov/ Mailing list: https://ssd.jpl.nasa.gov/email_list.html System news : https://ssd.jpl.nasa.gov/horizons/news.html User Guide : https://ssd.jpl.nasa.gov/horizons/manual.html Connect : browser https://ssd.jpl.nasa.gov/horizons/app.html#/x API https://ssd-api.jpl.nasa.gov/doc/horizons.html command-line telnet ssd.jpl.nasa.gov 6775 e-mail/batch https://ssd.jpl.nasa.gov/ftp/ssd/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov *************************************************************************************************************************** !$$SOF COMMAND = '3I' START_TIME = '2025-12-19 05:57:32.626' STOP_TIME = '2025-12-19 06:06' STEP_SIZE = '1 m' QUANTITIES = '19,23,20,39'