(2131)
_dynamical type, primary:_main belt asteroid, Hungaria
_orbital data, primary (osculating elements)_[JPL] :
| semimajor axis a: | 1.887274522 AU |
|---|---|
| orbital period P: | 2.592751044 yr (= 947.0023187 d) |
| eccentricity e: | 0.111037884 |
| perihelion distance q: | 1.677715553 AU |
| aphelion distance Q: | 2.096833491 AU |
| inclination i: | 33.99597521° |
| argument of perihelion ω: | 38.36404634° |
| ascending node Ω: | 306.0630878° |
| mean anomaly M: | 342.0508634° |
| perihelion passage TP: | 2014 Jul 09.2163 |
| Epoch**:** | 2014 May 23 |
| data arc**:** | 1975-2013 (756 obs.) |
| Earth MOID**:** | 0.693214 AU |
| Jupiter Tisserand invariant TJ: | 3.75 |
orbital data, secondary:
| binary dynamical type**:** | A [L15a] |
|---|---|
| semimajor axis as: | 18 km [*E] |
| separation/primary radius as/rp: | 4.4 [*E] |
| separation/Hill radius as/rH: | 0.017 [*E] |
| orbital period Ps: | 0.9783 ± 0.0004 d [W10c] |
| eccentricity es: | <0.2 [P16d] |
| normalized ang. mom. αL: | ? |
other data, system (combined):
| absolute mag. H: | 12.72 [MPC] |
|---|---|
| slope parameter G: | (0.15) [*A] |
| effective diameter dE: | 8.56 ± 0.07 km [M11b] |
| geometric albedo**:** | 0.198 ± 0.034 [M11b] |
| color index U-B: | 0.45 [JPL] |
| color index B-V: | 0.871 [JPL] |
| taxonomic type**:** | S (SMASSII) [JPL]S (Tholen) [JPL] |
| mass m: | ? |
| density ρ: | (1.6 g/cm3) [*A] |
| Hill radius rH: | 1100 km [*E] |
other data, primary:
| diameter dp: | 8.2 ± 0.07 km [*D] |
|---|---|
| rotation period RPp: | 2.568 ± 0 h [W10c] |
| amplitude in mag., rotational ΔM: | 0.09 ± 0.02 [W07a] |
| pole direction Β, λ: | ? , ? |
other data, secondary:
| diameter ds: | 2.46 km [*D] |
|---|---|
| diameter ratio ds/dp: | 0.3 [P16d] |
| component mag. difference ΔM: | 2.6 [*D] |
| rotation period RPs: | ? |