Table 1
Values of the heliocentric Keplerian orbital elements and their respective 1σ uncertainties of comets 29P/Schwassmann-Wachmann 1, P/2008 CL94 (Lemmon), and P/2010 TO20 (LINEAR-Grauer), and centaur 2020 MK4.
| Orbital parameter | 29P/Schwassmann-Wachmann 1 | P/2008 CL94 (Lemmon) | P/2010 TO20 (LINEAR-Grauer) | 2020 MK4 | |
|---|---|---|---|---|---|
| Semimajor axis, a (AU) | = | 5.99579143 ± 0.00000004 | 6.1706 ± 0.0002 | 5.6012 ± 0.0003 | 6.15875 ± 0.00007 |
| Eccentricity, e | = | 0.04437627 ± 0.00000002 | 0.11941 ± 0.00008 | 0.088533 ± 0.000005 | 0.0220 ± 0.0002 |
| Inclination, i (°) | = | 9.382089 ± 0.000002 | 8.34819 ± 0.00010 | 2.63909 ± 0.00012 | 6.66716 ± 0.00010 |
| Longitude of the ascending node, Ω (°) | = | 312.595345 ± 0.000011 | 33.4617 ± 0.0004 | 43.9656 ± 0.0008 | 2.344 ± 0.002 |
| Argument of perihelion, ω (°) | = | 50.20600 ± 0.00002 | 82.05 ± 0.02 | 251.89 ± 0.03 | 176.2 ± 0.2 |
| Mean anomaly, M (°) | = | 176.60347 ± 0.00002 | 54.801 ± 0.011 | 82.78 ± 0.03 | 112.7 ± 0.2 |
| Perihelion distance, q (AU) | = | 5.72972056 ± 0.00000013 | 5.4337 ± 0.0004 | 5.1053 ± 0.0002 | 6.0230 ± 0.0010 |
| Aphelion distance, Q (AU) | = | 6.26186229 ± 0.00000004 | 6.9074 ± 0.0002 | 6.0971 ± 0.0003 | 6.29447 ± 0.00007 |
| Absolute magnitude, H (mag) | = | 8.6 ± 1.0 | 8.5 ± 0.4 | 5.9 ± 0.4 | 11.4 ± 0.6 |
Notes. The orbit determination of comet 29P/Schwassmann-Wachmann 1 was computed by S. Naidu, it is referred to as epoch JD 2455844.5 (2011-Oct.-10.0) TDB (Barycentric Dynamical Time, J2000.0 ecliptic and equinox), and it is based on 33 010 observationswith a data-arc span of 8729 days (solution date, 2021-Feb.-02 23:49:37 PST). The orbit determination of comet P/2008 CL94 (Lemmon) is referred to as epoch JD 2454769.5 (2008-Oct.-30.0) TDB and it is based on 61 observations with a data-arc span of 491 days (solution date, 2020-Nov.-11 10:56:31 PST). The orbit determination of comet P/2010 TO20 (LINEAR-Grauer) is referred to as epoch JD 2455832.5 (2011-Sep.-28.0) TDB and it is based on 58 observationswith a data-arc span of 776 days (solution date, 2020-Nov.-11 10:56:01 PST). The orbit determination of 2020 MK4 is referred to as epoch JD 2459000.5 (2020-May-31.0) TDB and it is based on 108 observations with a data-arc span of 147 days (solution date, 2020-Dec.-28 03:38:37 PST). Source: JPL’s SBDB.
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