C/2015 K7
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Comet C/2015 K7 was discovered on 17 May 2015 with the Subaru Telescope (Maunakea), that is more than two years after its perihelion passage. Fortunately, many pre-discoveries measurements were next found going back to 9 March 2013 (about two weeks after perihelion passage).
Thus, the GR solution given here is based on post-perihelion data span over 2.21 yr in a range of heliocentric distances from 9.94 au to 10.90 au.
Comet had its closest approach to the Earth on 30 May 2013 (8.94 au), about 3 months after its perihelion passage.
This Oort spike comet suffers tiny planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (semimajor axis of about 6,700 au).
Thus, the GR solution given here is based on post-perihelion data span over 2.21 yr in a range of heliocentric distances from 9.94 au to 10.90 au.
Comet had its closest approach to the Earth on 30 May 2013 (8.94 au), about 3 months after its perihelion passage.
This Oort spike comet suffers tiny planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (semimajor axis of about 6,700 au).
| solution description | ||
|---|---|---|
| number of observations | 59 | |
| data interval | 2013 03 09 – 2015 05 26 | |
| data type | observed only after perihelion (POST) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 9.94 au – 10.9au | |
| 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 | 118 | |
| RMS [arcseconds] | 0.26 | |
| orbit quality class | 1a | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2013 03 09 | |
| perihelion date | 2013 02 20.04857918 | ± 0.00930962 |
| perihelion distance [au] | 9.94043803 | ± 0.00003132 |
| eccentricity | 1.00440291 | ± 0.00001868 |
| argument of perihelion [°] | 5.102918 | ± 0.000427 |
| ascending node [°] | 257.935436 | ± 0.000053 |
| inclination [°] | 159.890462 | ± 0.00004 |
| reciprocal semi-major axis [10-6 au-1] | -442.93 | ± 1.87 |
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.