C/2013 G9 Tenagra
more info
Comet C/2013 G9 was discovered on 15 April 2013 with Tenagra II telescope (near Nogales, U.S.A.), that is a year and 9 months before its perihelion passage. Soon, it was found on earlier images taken on 9 April 2013 with the VHS-VISTA, Cerro Paranal. This comet was observed during four oppositions until 6 April 2016.
Comet had its closest approach to the Earth on 26 March 2015 (4.424 au), about 2.5 months after perihelion passage.
Solution given here is based on data spanning over 2.99 yr in a range of heliocentric distances: 7.10 au – 5.337 au (perihelion) – 6.27 au.
This Oort spike comet suffers very slight planetary perturbations during its passage through the planetary system and in the next perihelion passage it will be an Oort spike comet.

solution description
number of observations 515
data interval 2013 04 09 – 2016 04 06
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 7.1 au – 5.34 au (perihelion) – 6.27 au
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 1002
RMS [arcseconds] 0.36
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 2015 01 18
perihelion date 2015 01 14.75933313 ± 0.00031521
perihelion distance [au] 5.33749750 ± 0.00000201
eccentricity 1.00089880 ± 0.00000260
argument of perihelion [°] 204.945293 ± 0.000032
ascending node [°] 35.687555 ± 0.000008
inclination [°] 146.230388 ± 0.000008
recip semi-major axis [10-6 au-1] -168.39 ± 0.49
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