Asteroids with Satellites Database--Johnston's Archive

(525816) 2005 SF278

compiled by Wm. Robert Johnston
last updated 27 May 2019

--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: 43.5002 AU
orbital period P: 286.904 yr
(= 104793.7 d)
eccentricity e: 0.183233
perihelion distance q: 35.52951 AU
aphelion distance Q: 51.4709 AU
inclination i: 13.359993°
argument of perihelion ω: 320.858°
ascending node Ω: 101.51993°
mean anomaly M: 354.9327°
perihelion passage TP: 2023 May 11.1
Epoch: 2019 Apr 27
data arc: 2004-2018 (290 obs.)
Earth MOID: 34.5534 AU
Jupiter Tisserand invariant TJ: 5.651
Neptune Tisserand invariant TN:2.992 [*D]

orbital data, secondary:
semimajor axis as: 10275 ± 25 km (separation) [B18d]
orbital period Ps: 160 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.6 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 211 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: 540000 km [*E]

other data, primary:
diameter dp: 158 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 139 km [*E]
diameter ratio ds/dp: 0.879 ± 0.012 [*D]
component mag. difference ΔM: 0.28 ± 0.03 [B18d]
rotation period RPs: ?

-- (525816) 2005 SF278 --discovery and notes:

Primary discovered 2005 Sep 26 from Apache Point Observatory, New Mexico, USA by A. C. Becker, A. W. Puckett, J. Kubica. Linked to prediscovery observations from 2004 Sep 22. Permanent number assigned 2019 May 18.

Companion discovered 2014 Dec 08 by S. D. Benecchi, S. S. Sheppard, K. S. Noll, and C. A.Trujillo using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2018 Feb 07 [B18d].

--Links, more technical:

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--Links to ADS abstracts:

© 2018, 2019 by Wm. Robert Johnston.
Last modified 27 May 2019.
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