A look at the JPL HORIZON ephemeris confirming location of 58P/Jackson-N for the time of observation
Ephemeris / WWW_USER Thu Aug 27 13:18:53 2020 Pasadena, USA / Horizons
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Target body name: 58P/Jackson-Neujmin {source: JPL#K204/1}
Center body name: Earth (399) {source: DE431}
Center-site name: GEOCENTRIC
Date__(UT)__HR:MN R.A._____(ICRF)_____DEC T-mag N-mag delta deldot S-O-T /r S-T-O
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$$SOE
2020-Aug-25 00:00 06 04 40.02 +12 05 16.3 15.856 n.a. 1.95909330408827 -2.2311683 61.4384 /L 31.0322
2020-Aug-25 01:00 06 04 45.30 +12 05 05.5 15.857 n.a. 1.95903956378590 -2.2355298 61.4565 /L 31.0323
2020-Aug-25 02:00 06 04 50.57 +12 04 54.7 15.858 n.a. 1.95898571851350 -2.2398930 61.4746 /L 31.0325
2020-Aug-25 03:00 06 04 55.84 +12 04 43.8 15.859 n.a. 1.95893176823177 -2.2442578 61.4927 /L 31.0326
2020-Aug-25 04:00 06 05 01.11 +12 04 33.0 15.860 n.a. 1.95887771290118 -2.2486243 61.5108 /L 31.0328
2020-Aug-25 05:00 06 05 06.38 +12 04 22.1 15.862 n.a. 1.95882355248215 -2.2529924 61.5289 /L 31.0329
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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 dates prior to 1582-Oct-15 are in the
Julian calendar system. Later calendar dates are in the Gregorian system.
NOTE: "n.a." in output means quantity "not available" at the print-time.'R.A._____(ICRF)_____DEC' =
Astrometric right ascension and declination of the target center with
respect to the observing site (coordinate origin) in the reference frame of
the planetary ephemeris (ICRF). Compensated for down-leg light-time delay
aberration.
Units: RA in hours-minutes-seconds of time, HH MM SS.ff{ffff}
DEC in degrees-minutes-seconds of arc, sDD MN SC.f{ffff}
'T-mag N-mag' =
Comets' apparent visual total magnitude ("T-mag") and nuclear magnitude
("N-mag") using the standard IAU model:
T-mag= M1 + 5*log10(delta) + k1*log10(r)
N-mag= M2 + 5*log10(delta) + k2*log10(r) + phcof*beta
Units: MAGNITUDES
'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
'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
'S-T-O' =
The Sun-Target-Observer angle; the interior vertex angle at target center
formed by a vector from the target to the apparent center of the Sun (at
reflection time on the target) and the apparent vector from target 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
Computations by ...
Solar System Dynamics Group, Horizons On-Line Ephemeris System
4800 Oak Grove Drive, Jet Propulsion Laboratory
Pasadena, CA 91109 USA
Information : https://ssd.jpl.nasa.gov/
Documentation: https://ssd.jpl.nasa.gov/?horizons_doc
Connect : https://ssd.jpl.nasa.gov/?horizons (browser)
telnet ssd.jpl.nasa.gov 6775 (command-line)
e-mail command interface available
Script and CGI interfaces available
Author : Jon.D.Giorgini@jpl.nasa.gov