C/1993 Q1 Mueller
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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
detectability of NG effects in the comet's motion comet with determinable NG~orbit
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 1066
RMS [arcseconds] 1.00
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 1696 01 10
perihelion date 1994 03 26.01150931 ± 0.00091957
perihelion distance [au] 0.96696069 ± 0.00000224
eccentricity 0.99999471 ± 0.00000198
argument of perihelion [°] 261.114966 ± 0.000153
ascending node [°] 193.890604 ± 0.000027
inclination [°] 104.974442 ± 0.000051
reciprocal semi-major axis [10-6 au-1] 5.46 ± 2.04
file containing 5001 VCs swarm
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.
Six 2D-projections of the 6D space of original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.