C/2017 M4 ATLAS
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Comet C/2017 M4 was discovered on 21 June 2017 by Asteroid Terrestrial-impact Last Alert System (ATLAS) Team, that is about months after its perihelion passage.
Some prediscovery images of this comet were found: taken on 16 June 2017 by Pan-STARRS 1 telescope (Haleakala).
Solutions given here are based on data spanning over 4.46 yr in a range of heliocentric distances: 6.09 au – 3.252 au (perihelion) – 9.19 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 | 430 | |
| data interval | 2019 02 01 – 2021 11 30 | |
| data arc selection | data generally limited to post-perihelion (POS) | |
| range of heliocentric distances | 3.25 au – 9.19au | |
| type of model of motion | NH - non-gravitational orbits for water sublimation from subsolar point | |
| data weighting | YES | |
| number of residuals | 834 | |
| RMS [arcseconds] | 0.30 | |
| orbit quality class | 1a | |
| next orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| next reciprocal semi-major axis [10-6 au-1] | 125.94 – 128.46 – 130.91 | |
| next perihelion distance [au] | 3.2675 – 3.2698 – 3.2724 | |
| next aphelion distance [103 au] | 15.3 – 15.6 – 15.9 | |
| time interval to next perihelion [Myr] | 0.667 – 0.686 – 0.707 | |
| percentage of VCs with qnext < 10 | 100 | |
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).
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).
| next orbit statistics, here only the Galactic tide has been included | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| next reciprocal semi-major axis [10-6 au-1] | 125.92 – 128.44 – 130.89 | |
| next perihelion distance [au] | 3.2706 – 3.2726 – 3.2749 | |
| next aphelion distance [103 au] | 15.3 – 15.6 – 15.9 | |
| time interval to next perihelion [Myr] | 0.667 – 0.686 – 0.707 | |
| percentage of VCs with qnext < 10 | 100 | |