C/2015 XY1 Lemmon
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Comet C/2015 XY1 was discovered on 4 December 2015 with Mount Lemmon survey, that is about 2.4 yr before its perihelion passage. In 2020, this comet is still observed.
Comet had its closest approach to the Earth on 27 December 2017 (6.984 au); about 4 months before its perihelion passage.
Solution given here is based on pre-perihelion data spanning over 2.28 yr in a range of heliocentric distances from 9.52 au to 7.93 au (16 March 2018).
This is Oort spike comet.
Comet had its closest approach to the Earth on 27 December 2017 (6.984 au); about 4 months before its perihelion passage.
Solution given here is based on pre-perihelion data spanning over 2.28 yr in a range of heliocentric distances from 9.52 au to 7.93 au (16 March 2018).
This is Oort spike comet.
| solution description | ||
|---|---|---|
| number of observations | 408 | |
| data interval | 2015 12 04 – 2018 03 16 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 9.52 au – 7.93au | |
| 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 | 804 | |
| RMS [arcseconds] | 0.30 | |
| orbit quality class | 1a+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2018 05 02 | |
| perihelion date | 2018 04 29.90847947 | ± 0.00186379 |
| perihelion distance [au] | 7.92798114 | ± 0.00000880 |
| eccentricity | 1.00413446 | ± 0.00000528 |
| argument of perihelion [°] | 196.351370 | ± 0.000122 |
| ascending node [°] | 281.616560 | ± 0.000009 |
| inclination [°] | 148.847719 | ± 0.000015 |
| recip semi-major axis [10-6 au-1] | -521.50 | ± 0.66 |
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.