******************************************************************************* JPL/HORIZONS ATLAS (C/2025 N1) 2026-Aug-18 16:19:32 Rec #:90004935 (+COV) Soln.date: 2026-Feb-19_09:10:47 # obs: 782 (2025-2026) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2461090.5 ! 2026-Feb-19.0000000 (TDB) RMSW= n.a. EC= 6.141351449317625 QR= 1.356481057231181 TP= 2460977.9952628477 OM= 322.1696089290778 W= 128.0228697185194 IN= 175.1164570850441 A= -.2638374502507929 MA= 98.22024580386574 ADIST= 9.999999E99 PER= 9.999999E99 N= 7.27276261 ANGMOM= .053540018 DAN= -3.48091 DDN= 2.02535 L= 194.0455827 B= 3.8453136 MOID= .364723 TP= 2025-Oct-29.4952628477 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= 9.478815 A1= 5.320206165314E-8 A2= 1.148166060448E-8 A3= -6.854491829872E-9 Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 0. R0= 1. COMET comments 1: soln ref.= JPL#54, data arc: 2025-05-15 to 2026-02-19 2: k1=4.5;Nongravitational accels. using g(r) = (1 au/ r)^2 for CO2 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Tue Aug 18 16:19:32 2026 Pasadena, USA / Horizons ******************************************************************************* Target body name: ATLAS (C/2025 N1) {source: JPL#54} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2025-Dec-19 05:30:00.0000 UT Stop time : A.D. 2025-Dec-19 06:30:00.0000 UT Step-size : 10 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.260818.p261114 EOP coverage : DATA-BASED 1962-JAN-20 TO 2026-AUG-18. PREDICTS-> 2026-NOV-13 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= 2461090.5 ! 2026-Feb-19.0000000 (TDB) RMSW= n.a. EC= 6.141351449317625 QR= 1.356481057231181 TP= 2460977.9952628477 OM= 322.1696089290778 W= 128.0228697185194 IN= 175.1164570850441 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.878465706009316E+00 Y= 3.556787034031755E+00 Z= 1.369259882335852E+00 VX=-3.393307402708430E-03 VY= 3.324252268915676E-02 VZ= 1.201145093769092E-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= 9.478815 A1= 5.320206165314E-8 A2= 1.148166060448E-8 A3= -6.854491829872E-9 Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 0. R0= 1. ******************************************************************************* Date__(UT)__HR:MN delta deldot RNG_3sigma RNGRT_3sig ************************************************************************** $$SOE 2025-Dec-19 05:30 1.79755341637946 -0.0321448 815.8879 0.0000899 2025-Dec-19 05:40 1.79755330810423 -0.0218526 815.9182 0.0000899 2025-Dec-19 05:50 1.79755324110866 -0.0115583 815.9485 0.0000899 2025-Dec-19 06:00 1.79755321540091 -0.0012620 815.9788 0.0000899 2025-Dec-19 06:10 1.79755323098913 0.0090363 816.0092 0.0000899 2025-Dec-19 06:20 1.79755328788145 0.0193367 816.0395 0.0000899 2025-Dec-19 06:30 1.79755338608604 0.0296391 816.0698 0.0000900 $$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. '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 Inquiries : Jon.D.Giorgini@jpl.nasa.gov ******************************************************************************* !$$SOF COMMAND = '3I' START_TIME = '2025-12-19 05:30' STOP_TIME = '2025-12-19 6:30' STEP_SIZE = '10 min' QUANTITIES = '20,39'