C/2011 M1 LINEAR
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Comet C/2011 M1 was discovered on 22 June 2011 during Lincoln Laboratory Near-Earth Asteroid Research project, that is 2.5 months before its perihelion passage. It was observed until 2 August 2011.
Comet had its closest approach to the Earth on 27 July 2011 (1.267 au), a bit more than a month after its discovery.
Solution given here is based on pre-perihelion data spanning over 0.112 yr in a range of heliocentric distances from 1.59 au to 1.10 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/2011 M1 was observed only before peryhelion; future orbit is given here though it is not certin that this comet survived perihelion passage. See also Table 2 in Sekanina 2019.
See also Królikowska 2020.

solution description
number of observations 122
data interval 2011 06 22 – 2011 08 02
data type observed only before perihelion (PRE)
data arc selection entire data set (STD)
range of heliocentric distances 1.59 au – 1.1au
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 236
RMS [arcseconds] 0.72
orbit quality class 3a
orbital elements (heliocentric ecliptic J2000)
Epoch 2011 08 27
perihelion date 2011 09 07.57173207 ± 0.01207094
perihelion distance [au] 0.89575820 ± 0.00018725
eccentricity 1.00274019 ± 0.00045567
argument of perihelion [°] 119.568620 ± 0.019023
ascending node [°] 324.796123 ± 0.003793
inclination [°] 70.183054 ± 0.000302
recip semi-major axis [10-6 au-1] -3,059.07 ± 508.41
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