C/1997 J2 Meunier-Dupouy
more info
Comet C/1997 J2 was discovered on 7 May 1997 by Michel Meunier (Arbonne la Foret, France) during the observation of comet C/1997 J1 Mueller.Independently, this comet was detected on 8 May by Philippe Dupouy (Observatoire de Dax, France). A day after, Jean Mueller found this comet on the image taken on 5 May (Mount Palomar Observatory)where she discovered C/1997 J1. At the moment of discovery, C/1997 J2 was about 10 months before its perihelion passage and it was last observed in October 1999.
Comet had its closest approach to the Earth on 14 August 1998 (2.492 au), about 5 months after its perihelion passage.
This is a comet with nongravitational effects strongly manifested in positional data fitting.
Solutions given here are based on data spanning over 2.43 yr in a range of heliocentric distances: 4.24 au – 3.05 au (perihelion) – 6.06 au.It is difficult to indicate the preffered non-gravitational orbit and worth noting is also the solution based on g(r)-like formula describing the CO sublimation (solution c1).
This Oort spike comet suffers tiny planetary perturbations during its passage through the planetary system; these perturbations lead to a slightly less tight future orbit.
See also Królikowska 2014 and Królikowska 2020.

solution description
number of observations 1446
data interval 1997 05 05 – 1999 10 09
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 4.24 au – 3.05 au (perihelion) – 6.06 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 2863
RMS [arcseconds] 0.53
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 1998 03 08
perihelion date 1998 03 10.44247753 ± 0.00011059
perihelion distance [au] 3.05109435 ± 0.00000118
eccentricity 1.00056658 ± 0.00000179
argument of perihelion [°] 122.674220 ± 0.000028
ascending node [°] 148.844627 ± 0.000006
inclination [°] 91.27339 ± 0.000006
reciprocal semi-major axis [10-6 au-1] -185.70 ± 0.59
Upper panel: Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line — the moment of perihelion passage.
Lower panel (panels): O-C diagram for this(two) solution (solutions) given in this database, where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
non-gravitational parameters
A1 [10-8au/day2] 292.74 ± 6.92
A2 [10-8au/day2] -50.389 ± 6.354
A3 [10-8au/day2] 0 (assumed)
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113