(42355)
Typhon and Echidna (original) (raw)
_dynamical type, primary:_Centaur
_orbital data, primary (osculating elements)_[JPL] :
| semimajor axis a: | 38.10752321 AU |
|---|---|
| orbital period P: | 235.2471044 yr (= 85924.00487 d) |
| eccentricity e: | 0.540154039 |
| perihelion distance q: | 17.52359062 AU |
| aphelion distance Q: | 58.6914558 AU |
| inclination i: | 2.425475766° |
| argument of perihelion ω: | 159.0392585° |
| ascending node Ω: | 351.9128057° |
| mean anomaly M: | 12.26421083° |
| perihelion passage TP: | 2006 May 17.80 |
| Epoch**:** | 2014 May 23 |
| data arc**:** | 1989-2013 (172 obs.) |
| Earth MOID**:** | 16.535 AU |
| Jupiter Tisserand invariant TJ: | 4.687 |
| Neptune Tisserand invariant TN: | 2.682 [*D] |
orbital data, secondary:
| semimajor axis as: | 1580 ± 20 km [G14a] |
|---|---|
| separation/primary radius as/rp: | 19.5 [*D] |
| separation/Hill radius as/rH: | 0.011 [*D] |
| orbital period Ps: | 18.982 ± 0.001 d [G14a] |
| eccentricity es: | 0.507 ± 0.009 [G14a] |
| inclination is: | 42° ± 2° [G14a] |
| ascending node Ωs: | 254° ± 2° [G14a] |
| argument of pericenter ωs: | 354° ± 1° [G14a] |
| mean anomaly M: | 11° ± 1° [G14a] |
| Epoch**:** | 2006 Sep 21.5 |
| normalized ang. mom. αL: | ? |
other data, system (combined):
| absolute mag. H: | 7.5 [MPC]7.72 ± 0.04 [S12a] |
|---|---|
| slope parameter G: | (0.15) [*A] |
| effective diameter dE: | 185 ± 7/7 km [S12a] |
| geometric albedo**:** | 0.044 ± 0.003/0.003 [S12a] |
| color index U-B: | 0.21 [J07a] |
| color index B-V: | 0.74 [T03b] |
| color index V-R: | 0.52 ± 0.01 [T03b] |
| color index B-R: | 1.26 [T03b] |
| color index V-I: | 0.99 ± 0.04 [G08a] |
| color index R-J: | 1.31 [*D] |
| color index V-J: | 1.83 ± 0.09 [D07c] |
| color index J-H: | 0.18 [*D] |
| color index V-H: | 2.01 ± 0.05 [D09c] |
| taxonomic type**:** | BR,BB (G-mode) [P10a] |
| mass m: | 8.7x1017 ± 3x1016kg [G14a] |
| density ρ: | 0.36 ± 0.08/0.07 g/cm3[S12a] |
| Hill radius rH: | 140000 km [*D] |
other data, primary:
| diameter dp: | 162 ± 7 km [S12a] |
|---|---|
| color index V-I: | 0.99 ± 0.04 [G08a] |
| rotation period RPp: | 9.67 h [D09b] |
| amplitude in mag., rotational ΔM: | 0.07 ± 0.01 [T10a] |
| pole direction Β, λ: | ? , ? |
other data, secondary:
| diameter ds: | 89 ± 6 km [S12a] |
|---|---|
| diameter ratio ds/dp: | 0.55 ± 0.015 [S12a] |
| component mag. difference ΔM: | 1.3 ± 0.06 [G08a] |
| color index V-I: | 0.95± 0.04 [G08a] |
| rotation period RPs: | ? |