Table 1.
Osculating heliocentric orbit of K2 based on 450 positional measurements spanning the time interval from 2013 May 12 to 2018 January 23 available at MPC on 2018 February 21.
| Solution A1 | Solution A0 | JPL solution | |
|---|---|---|---|
| Perihelion distance [au] | 1.81086204 ± 0.00005500 | 1.81081861 ± 0.00006434 | 1.81072035 ± 0.00013422 |
| Eccentricity | 1.00032653 ± 0.00001443 | 1.00031764 ± 0.00001823 | 1.00029212 ± 0.00003797 |
| Time of perihelion passage [TT] | 2022 12 21.412478 ± 0.030195 | 2022 12 21.420049 ± 0.041069 | 2022 12 21.465966 ± 0.085538 |
| Inclination [deg] | 87.553729 ± 0.000023 | 87.553662 ± 0.000045 | 87.553645 ± 0.000095 |
| Argument of perihelion [deg] | 236.021084 ± 0.001710 | 236.022156 ± 0.002056 | 236.025192 ± 0.004281 |
| Longitude of the ascending node [deg] | 88.181668 ± 0.000236 | 88.182090 ± 0.000461 | 88.182237 ± 0.000973 |
| Epoch of osculation [TT] | 2017 07 05 | 2017 07 05 | 2017 07 05 |
| RMS | 0.38 arcsec | 0.47 arcsec | 0.52 (normalized) |
Notes. Ecliptic of J2000 is used. Solution A1 is based on weighted measurements whereas A0 is based on unweighted data. For comparison, Jet Propulsion Laboratory (JPL) solution is presented in the last column; it is based on 446 observations and the same interval of data (retrieved from the JPL Small-Body Database Browser on 21 February 2018).
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