Asteroids with Satellites Database--Johnston's Archive
2015 RT245
compiled by Wm. Robert Johnston
last updated
15 December 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, Cubewano
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
44.392 AU
| |
orbital period P: |
295.772 yr
(= 108033 d)
| |
eccentricity e: |
0.086527
| |
perihelion distance q: |
40.551 AU
| |
aphelion distance Q: |
48.2331 AU
| |
inclination i: |
0.9534°
| |
argument of perihelion ω: |
342.36°
| |
ascending node Ω: |
330.147°
| |
mean anomaly M: |
49.87°
| |
perihelion passage TP: |
1978 May 07
| |
Epoch: |
2019 Apr 27
| |
data arc: |
2013-2017
(65 obs.)
| |
Earth MOID: |
39.536 AU
| |
Jupiter Tisserand invariant TJ: |
5.936
|
| Neptune Tisserand invariant TN: | 3.09799536568756 [*D] |
orbital data, secondary:
|
semimajor axis as: |
14680
± 60 km
(separation)
[G19c]
| |
separation/primary radius as/rp: | 180 [*E] | |
separation/Hill radius as/rH: | 0.025 [*E] | |
orbital period Ps: |
250
d [*E]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
6.5
[MPC]
7.1 ± 0.5 [G19c]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
222
km [*E]
| |
geometric albedo: |
(0.09
) [*A]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1
g/cm3) [*A]
| |
Hill radius rH: |
580000 km [*E]
|
other data, primary:
|
diameter dp: |
161
km [*E]
| |
rotation period RPp: |
?
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
153
km [*E]
| |
diameter ratio ds/dp: |
0.95
[*D]
| |
component mag. difference ΔM: |
0.1
[G19c]
| |
rotation period RPs: |
?
| |
|
|
--
2015 RT245
--discovery and notes:
Primary discovered
2015 Sep 08
from
Mauna Kea Observatory, Hawaii, USA
by
Solar System Origins Legacy Survey (A. H. Parker et al.).
Linked to prediscovery observations from 2013 Oct 12.
Companion discovered
2019 Sep 02
by Solar System Origins Legacy Survey (A. H. Parker et al.)
using
Hubble Space Telescope
observations from Hubble Space Telescope.
Announced
2019 Nov 05 [G19c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2019
by Wm. Robert Johnston.
Last modified
15 December 2019.
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