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:
--Links, less technical:
--Links to ADS abstracts:
©
2018, 2019
by Wm. Robert Johnston.
Last modified
27 May 2019.
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