Asteroids with Satellites Database--Johnston's Archive
(469705)
|Kagara
and !Haunu
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: |
43.8291 AU
| |
orbital period P: |
290.1642 yr
(= 105984.6 d)
| |
eccentricity e: |
0.087176
| |
perihelion distance q: |
40.00826 AU
| |
aphelion distance Q: |
47.65 AU
| |
inclination i: |
2.869393°
| |
argument of perihelion ω: |
78.6849°
| |
ascending node Ω: |
118.0931°
| |
mean anomaly M: |
339.5756°
| |
perihelion passage TP: |
2037 Jun 04.0
| |
Epoch: |
2020 Dec 17
| |
data arc: |
2005-2020
(222 obs.)
| |
Earth MOID: |
39.0076 AU
| |
Jupiter Tisserand invariant TJ: |
5.894
|
| Neptune Tisserand invariant TN: | 3.088 [*D] |
orbital data, secondary:
|
semimajor axis as: |
7670
± 140 km
[G19b]
| |
separation/primary radius as/rp: | 110 [*D] | |
separation/Hill radius as/rH: | 0.018 [*D] | |
orbital period Ps: |
128.107
± 0.027
d [G19b]
| |
eccentricity es: |
0.694
± 0.013
[G19b]
| |
inclination is: | 33.33° ± 0.41° [G19b] | |
ascending node Ωs: | 4.13° ± 0.32° [G19b] | |
argument of pericenter ωs: | 183.57° ± 0.76° [G19b] | |
mean anomaly M: | 136.08° ± 0.88° [G19b] | |
Epoch: | 2011 Feb 07.5 | |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
6.16
[MPC]
6.4 ± 0.5 [V12a]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
174
± 27/32
km [V12a]
| |
geometric albedo: |
0.16
± 0.13/0.07
[V12a]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
2.18x1018
± 1.2x1017
kg [G19b]
| |
density ρ: |
1.1
± 0.61
g/cm3[K17b]
| |
Hill radius rH: |
430000 km [*E]
|
other data, primary:
|
diameter dp: |
138
km [*E]
| |
rotation period RPp: |
9.65
h [B13a]
| |
amplitude in mag., rotational ΔM: |
0.31
± 0.04
[B13a]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
105
km [*E]
| |
diameter ratio ds/dp: |
0.762
[G12b]
| |
component mag. difference ΔM: |
0.59
[G12b]
| |
rotation period RPs: |
?
| |
|
|
--
(469705) |Kagara and !Haunu
--discovery and notes:
Primary discovered
2005 Mar 11
from
Kitt Peak Observatory, Arizona, USA
by
M. W. Buie.
Alternate designation(s):
2005 EF298
.
Permanent number assigned 2016 Aug 18.
Named 2021 Jun 16 for the Xam mythological character [WGSBN0103].
Companion discovered
2009 Jan 21
using
Hubble Space Telescope
observations from Hubble Space Telescope.
Announced
2011.
Permanent designation !Haunu, assigned 2021 Jun 16; named for the Xam mythological character [].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2011-2019, 2021
by Wm. Robert Johnston.
Last modified
9 October 2021.
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