(26308) 1998 SM165
and S/2001 (26308) 1 (original) (raw)
_dynamical type, primary:_TNO, 1:2 resonance
_orbital data, primary (osculating elements)_[JPL] :
| semimajor axis a: | 47.675 AU |
|---|---|
| orbital period P: | 329.190 yr (= 120236.8 d) |
| eccentricity e: | 0.369454 |
| perihelion distance q: | 30.0614 AU |
| aphelion distance Q: | 65.289 AU |
| inclination i: | 13.50696° |
| argument of perihelion ω: | 131.216° |
| ascending node Ω: | 183.16624° |
| mean anomaly M: | 43.221° |
| perihelion passage TP: | 1974 Nov 13 |
| Epoch**:** | 2014 May 23 |
| data arc**:** | 1982-2010 (83 obs.) |
| Earth MOID**:** | 29.0631 AU |
| Jupiter Tisserand invariant TJ: | 5.579 |
| Neptune Tisserand invariant TN: | 2.91 [*D] |
orbital data, secondary:
| semimajor axis as: | 11377 ± 8 km [G14a] |
|---|---|
| separation/primary radius as/rp: | 85 [*D] |
| separation/Hill radius as/rH: | 0.024 [*D] |
| orbital period Ps: | 130.158 ± 0.005 d [G14a] |
| eccentricity es: | 0.4727 ± 0.0007 [G14a] |
| inclination is: | 81.57° ± 0.05° [G14a] |
| ascending node Ωs: | 47.09° ± 0.08° [G14a] |
| argument of pericenter ωs: | 114.9° ± 0.1° [G14a] |
| mean anomaly M: | 280.5° ± 0.1° [G14a] |
| Epoch**:** | 2003 Mar 01.5 |
| normalized ang. mom. αL: | ? |
other data, system (combined):
| absolute mag. H: | 5.8 [MPC]6.38 [S08a] |
|---|---|
| slope parameter G: | (0.15) [*A] |
| effective diameter dE: | 279.8 ± 29.7/28.6 km [S08b] |
| geometric albedo**:** | 0.063 ± 0.015/0.012 [S08b] |
| color index U-B: | 0.21 [J07a] |
| color index B-V: | 1.02 [G14a] |
| color index V-R: | 0.63 ± 0.02 [G14a] |
| color index B-R: | 1.653 [H02a] |
| color index V-I: | 1.3 ± 0.05 [D07c] |
| color index R-J: | 1.71 [D07c] |
| color index V-J: | 2.33 ± 0.06 [D07c] |
| color index J-H: | 0.56 ± 0.04 [D07c] |
| color index V-H: | 2.88 ± 0.08 [H02a] |
| taxonomic type**:** | RR (G-mode) [B05b] |
| mass m: | 6.87x1018 ± 1.8x1016kg [G11a] |
| density ρ: | 0.51 ± 0.29/0.14 g/cm3[S06b] |
| Hill radius rH: | 470000 km [*D] |
other data, primary:
| diameter dp: | 268 ± 28 km [*D] |
|---|---|
| color index V-I: | 1.4 ± 0.04 [B08d] |
| rotation period RPp: | 8.4 ± 0.05 h [S06b] |
| amplitude in mag., rotational ΔM: | 0.56 [T14a] |
| pole direction Β, λ: | ? , ? |
other data, secondary:
| diameter ds: | 81 ± 14 km [*D] |
|---|---|
| diameter ratio ds/dp: | 0.302 ± 0.042 [N08c] |
| component mag. difference ΔM: | 2.69 [G14a] |
| color index V-I: | 1.32± 0.05 [B08d] |
| rotation period RPs: | ? |