C/2017 F1 Lemmon
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Comet C/2017 F1 was discovered on 20 March 2017 with Mount Lemmon survey, that is about 8.5 months before its perihelion passage. Later single pre-discovery obsebation was found from 4 February 2017. This comet was rather rarely observed until 18 March 2018.
Comet had its closest approach to the Earth on 24 December 2017 (3.480 au), less than a month after its perihelion passage.
The preferred solution given here is based on data spanning over 1.12 yr in a range of heliocentric distances: 5.10 au – 4.50 au (perihelion) – 4.58 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
Comet had its closest approach to the Earth on 24 December 2017 (3.480 au), less than a month after its perihelion passage.
The preferred solution given here is based on data spanning over 1.12 yr in a range of heliocentric distances: 5.10 au – 4.50 au (perihelion) – 4.58 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
| solution description | ||
|---|---|---|
| number of observations | 84 | |
| data interval | 2017 03 20 – 2018 02 17 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 4.95 au – 4.50 au (perihelion) – 4.54 au | |
| detectability of NG effects in the comet's motion | NG effects not determinable | |
| type of model of motion | GR - gravitational orbit | |
| data weighting | NO | |
| number of residuals | 155 | |
| RMS [arcseconds] | 0.41 | |
| orbit quality class | 1b | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2017 11 23 | |
| perihelion date | 2017 11 30.98962959 | ± 0.00626776 |
| perihelion distance [au] | 4.49976347 | ± 0.00001238 |
| eccentricity | 1.00436273 | ± 0.00002416 |
| argument of perihelion [°] | 64.815961 | ± 0.000835 |
| ascending node [°] | 158.742618 | ± 0.000102 |
| inclination [°] | 146.481068 | ± 0.000052 |
| reciprocal semi-major axis [10-6 au-1] | -969.55 | ± 5.36 |
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.
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.