Asteroids with Satellites Database--Johnston's Archive
(469509)
2003 HC57
compiled by Wm. Robert Johnston
last updated
9 October 2021
--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: |
44.0336 AU
| |
orbital period P: |
292.203 yr
(= 106727.1 d)
| |
eccentricity e: |
0.069749
| |
perihelion distance q: |
40.96229 AU
| |
aphelion distance Q: |
47.1049 AU
| |
inclination i: |
1.037789°
| |
argument of perihelion ω: |
47.042°
| |
ascending node Ω: |
233.9975°
| |
mean anomaly M: |
306.698°
| |
perihelion passage TP: |
2064 Oct 05.1
| |
Epoch: |
2021 Jul 01
| |
data arc: |
2003-2021
(284 obs.)
| |
Earth MOID: |
39.9457 AU
| |
Jupiter Tisserand invariant TJ: |
5.921
|
| Neptune Tisserand invariant TN: | 3.09683770469186 [*D] |
orbital data, secondary:
|
semimajor axis as: |
1960
± 70 km
(separation)
[G20a]
| |
separation/primary radius as/rp: | 19 [*E] | |
separation/Hill radius as/rH: | 0.0029 [*E] | |
orbital period Ps: |
8.4
d [*E]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
5.96
[MPC]
6.1 ± 0.5 [G20a]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
283
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: |
690000 km [*E]
|
other data, primary:
|
diameter dp: |
205
km [*E]
| |
rotation period RPp: |
?
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
195
km [*E]
| |
diameter ratio ds/dp: |
0.95
[*D]
| |
component mag. difference ΔM: |
0.1
[G20a]
| |
rotation period RPs: |
?
| |
|
|
--
(469509) 2003 HC57
--discovery and notes:
Primary discovered
2003 Apr 26
from
Mauna Kea Observatory, Hawaii, USA
by
?.
Permanent number assigned 2016 Aug 18.
Companion discovered
2020 Jun 02
by A. H. Parker, et al., and the Solar System Origins Legacy Survey
using
Hubble Space Telescope
observations from Hubble Space Telescope.
Announced
2020 Jul [G20a].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2020, 2021
by Wm. Robert Johnston.
Last modified
9 October 2021.
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