C/2009 R1 McNaught
more info
Comet C/2009 R1 was discovered on 9 September 2009 by Robert H. McNaught (Catalina Sky Survey); that is about 10 months before its perihelion passage. Next, pre-discovery images of the comet taken on 20 July, 1 August, and 18 August, 2009 (during Siding Spring Survey) were found. This comet of a very small perihelion distance of 0.405 au was observed only before its perihelion passage and was lost soon after it, some speculations about its disintegration were reported by individual observers.
Comet had its closest approach to the Earth on 15 June 2010 (1.135 au), about 2 weeks before its perihelion passage.
Although only the pre-perihelion data are available, C/2009 R1 exhibits nongravitational effects strongly manifesting in positional data fitting.
Solutions given here is based on data spanning over 0.942 yr in a range of heliocentric distances from 5.06 au to 0.41 au.
This Oort spike comet suffers small planetary perturbations during its passage to perihelion. C/2009 R1 might not have survived its perihelion passage; however, the future orbits are presented in this database.
See also Królikowska and Dybczyński 2013, Sekanina 2019, and Królikowska 2020.

solution description
number of observations 777
data interval 2009 07 20 – 2010 06 29
data type observed only before perihelion (PRE)
data arc selection entire data set (STD)
range of heliocentric distances 5.06 au – 0.41au
detectability of NG effects in the comet's motion comet lost close to perihelion or split comet
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 1502
RMS [arcseconds] 0.63
orbit quality class 1b
orbital elements (barycentric ecliptic J2000)
Epoch 1714 05 13
perihelion date 2010 07 01.17383125 ± 0.00002779
perihelion distance [au] 0.39448572 ± 0.00000099
eccentricity 1.00003534 ± 0.00000143
argument of perihelion [°] 131.128576 ± 0.000147
ascending node [°] 322.671427 ± 0.000014
inclination [°] 77.005143 ± 0.00005
reciprocal semi-major axis [10-6 au-1] -89.59 ± 3.63
file containing 5001 VCs swarm
2009r1a5.bmi
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.
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.