C/2012 C2 Bruenjes
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Comet C/2012 C2 was discovered on 11 February 2012 by Manfred Bruenjes (Warrensburg, MO, USA), that is a month before its perihelion passage. It was observed only about two weeks until 27 February 2012.
Comet had its closest observed approach to the Earth on 27 January 2012 (0.193 au), about two weeks before its discovery.
Solutions given here are based on pre-perihelion data spanning over 0.044 yr in a range of heliocentric distances from 0.987 au to 0.845 au.
Original value of 1/a is negative; however within its uncertainty of about 3 sigma this comet can came from the Oort Cloud.
C/2012 C2 was observed only before peryhelion; future orbit is given here though it is not certain that this comet survived perihelion passage. See also Table 5 in Sekanina 2019.
See also Królikowska 2020.

solution description
number of observations 264
data interval 2012 02 11 – 2012 02 27
data type observed only before perihelion (PRE)
data arc selection entire data set (STD)
range of heliocentric distances 0.98 au – 0.84au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 520
RMS [arcseconds] 0.74
orbit quality class 3b
orbital elements (heliocentric ecliptic J2000)
Epoch 2012 03 14
perihelion date 2012 03 12.66581815 ± 0.02100605
perihelion distance [au] 0.80203136 ± 0.00023562
eccentricity 1.00226872 ± 0.00070863
argument of perihelion [°] 62.700335 ± 0.035611
ascending node [°] 118.003723 ± 0.004560
inclination [°] 162.787047 ± 0.002244
recip semi-major axis [10-6 au-1] -2,828.72 ± 883.21
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