C/1993 Q1 Mueller
more info
Comet C/1993 Q1 was discovered on 16 August 1993 by Jean Mueller (Palomar Sky Survey II). Later, a prediscovery image of this comet taken on 28 September 1992 (Palomar Mountain-DSS) was found. At the moment of discovery, this comet was about 7.5 months before its perihelion passage and it was last observed in the mid-April 1994.
Comet had its closest approach to the Earth on 7 May 1994 (0.899 au), 1.5 month after its perihelion passage.
Preferred solution given here is based on data spanning over 1.55 yr in a range of heliocentric distances: 6.51 au – 0.967 au (perihelion) – 1.04 au.
Sekanina (2019) speculates that this comet may not have survived the perihelion passage.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system; if C/1993 Q1 survived the perihelion passage these perturbations lead to escape the comet on hyperbolic orbit from the planetary zone.
See also Królikowska 2020. .

solution description
number of observations 536
data interval 1992 09 28 – 1994 04 17
data type almost all measurements before perihelion (PRE++)
data arc selection entire data set (STD)
range of heliocentric distances 6.51 au – 0.97 au (perihelion) – 1.04 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 1063
RMS [arcseconds] 0.93
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 1994 03 29
perihelion date 1994 03 26.27531912 ± 0.00037157
perihelion distance [au] 0.96732496 ± 0.00000849
eccentricity 1.00021522 ± 0.00001371
argument of perihelion [°] 261.024041 ± 0.000917
ascending node [°] 193.788746 ± 0.000241
inclination [°] 105.02519 ± 0.00009
recip semi-major axis [10-6 au-1] -222.49 ± 14.17
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
non-gravitational parameters
A1 [10-8au/day2] 3.9776 ± 0.3259
A2 [10-8au/day2] 0.81532 ± 0.12414
A3 [10-8au/day2] 0.39844 ± 0.15817
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113