Asteroids with Satellites Database--Johnston's Archive

2005 SF278

compiled by Wm. Robert Johnston
last updated 15 March 2018

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary: TNO, 4:7 resonance


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 43.4787 AU
orbital period P: 286.7 yr
(= 104716 d)
eccentricity e: 0.18299
perihelion distance q: 35.52253 AU
aphelion distance Q: 51.4348 AU
inclination i: 13.353138°
argument of perihelion ω: 321.312°
ascending node Ω: 101.55275°
mean anomaly M: 353.2239°
perihelion passage TP: 2023 Aug 15
Epoch: 2018 Mar 23
data arc: 2004-2015 (174 obs.)
Earth MOID: 34.5453 AU
Jupiter Tisserand invariant TJ: 5.65


orbital data, secondary:
semimajor axis as: ?
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 220 km [*E]
geometric albedo: (0.09 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: RR (G-mode) []
mass m: ?
density ρ: (1 g/cm3) [*A]
Hill radius rH: 640000 km [*E]

other data, primary:
diameter dp: 220 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: ?
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
rotation period RPs: ?

-- 2005 SF278 --discovery and notes:

Primary discovered 2005. Linked to prediscovery observations from 2004 Sep 22.

Companion discovered by S. S. Sheppard using observations. Announced 2018 Feb 07 [S18b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2018 by Wm. Robert Johnston.
Last modified 15 March 2018.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.