C/2015 O1 PANSTARRS
more info


Comet C/2015 O1 was discovered on 19 July 2015 with Pan-STARRS 1 telescope (Haleakala), that is about  months after its perihelion passage.

Some prediscovery images of this comet were found: taken on 15 and 17 of June 2015 by Space Surveillance Telescope (Atom Site).

Solutions given here are based on data spanning over 4.76 yr in a range of heliocentric distances: 8.65 au – 3.730 au (perihelion) – 7.28 au.

NG orbits using full data-arc as well as independently using pre-perihelion and post-perihelion data are determinable.

See also Królikowska and Dones 2023.
solution description
number of observations 1903
data interval 2015 06 11 – 2018 02 18
data arc selection data generally limited to pre-perihelion (PRE)
range of heliocentric distances 8.65 au – 3.73au
detectability of NG effects in the comet's motion comet with NG effects strongly manifested in positional data fitting
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 3783
RMS [arcseconds] 0.36
orbit quality class 1a+
orbital elements (barycentric ecliptic J2000)
Epoch 1714 07 15
perihelion date 2018 02 18.05396304 ± 0.00023618
perihelion distance [au] 3.72106890 ± 0.00000179
eccentricity 0.99979435 ± 0.00000149
argument of perihelion [°] 89.695285 ± 0.000048
ascending node [°] 299.871800 ± 0.000009
inclination [°] 127.176649 ± 0.000006
reciprocal semi-major axis [10-6 au-1] 55.27 ± 0.40
file containing 5001 VCs swarm
2015o1pa.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.
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).
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.