Table 1.
Osculating orbital elements and their uncertainty as of epoch MJD 56700.0 TT.
| Asteroid | 0pt2ex a | e | I | Ω | ω | M | H | |
|---|---|---|---|---|---|---|---|---|
| [au] | [deg] | [deg] | [deg] | [deg] | [mag] | |||
| 458271 | 2010 UM26 | 2.576981320 | 0.326315921 | 3.8602822 | 235.394721 | 119.126545 | 313.470031 | 17.8 |
| 2010 RN221 | 2.576985942 | 0.32631528 | 3.860275 | 235.394639 | 119.12674 | 313.467345 | 19.2 | |
| Uncertainty | δa | δe | δI | δΩ | δω | δM | δH | |
| 458271 | 2010 UM26 | 1.7e−8 | 6.2e−8 | 6.1e−6 | 5.2e−5 | 5.7e−5 | 1.5e−5 | ∼0.15 |
| 2010 RN221 | 4.7e−8 | 1.7e−7 | 1.3e−5 | 9.6e−5 | 1.1e−4 | 4.0e−5 | ∼0.15 | |
Notes. Keplerian set of elements used: a semimajor axis, e eccentricity, I inclination, Ω longitude of node, ω argument of pericenter, and M mean anomaly of epoch. The default reference system is that of the heliocentric ecliptic J2000. The orbit determination used JPL DE440 ephemerides, and all observations of the two asteroids from the MPC repository were complemented by our own data (see the appendix). The absolute magnitude values H are provided by the orbit determination solution (i.e., they do not possess high photometric quality).
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