Asteroids with Satellites Database--Johnston's Archive
(148780)
Altjira
compiled by Wm. Robert Johnston
last updated
20 September 2014
--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: |
44.4009 AU
| |
orbital period P: |
295.867 yr
(= 108065.4 d)
| |
eccentricity e: |
0.05814
| |
perihelion distance q: |
41.819 AU
| |
aphelion distance Q: |
46.9826 AU
| |
inclination i: |
5.20380°
| |
argument of perihelion ω: |
301.36°
| |
ascending node Ω: |
1.9671°
| |
mean anomaly M: |
118.61°
| |
perihelion passage TP: |
1916 Nov 28
| |
Epoch: |
2014 May 23
| |
data arc: |
2001-2008
(70 obs.)
| |
Earth MOID: |
40.8064 AU
| |
Jupiter Tisserand invariant TJ: |
5.926
|
| Neptune Tisserand invariant TN: | 3.09 [*D] |
orbital data, secondary:
|
semimajor axis as: |
9904
± 56 km
[G11a]
| |
separation/primary radius as/rp: | 81 [*D] | |
separation/Hill radius as/rH: | 0.018 [*D] | |
orbital period Ps: |
139.561
± 0.047
d [G11a]
| |
eccentricity es: |
0.3445
± 0.0045
[G11a]
| |
inclination is: | 35.19° ± 0.19° [G11a] | |
ascending node Ωs: | 312.73° ± 0.31° [G11a] | |
argument of pericenter ωs: | 101.96° ± 0.91° [G11a] | |
mean anomaly M: | 224.89° ± 0.16° [G11a] | |
Epoch: | 2007 Jul 18.5 | |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
5.7
[MPC]
6.44 ± 0.14 [V14a]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
331
± 51/187
km [V14a]
| |
geometric albedo: |
0.043
± 0.182/0.01
[V14a]
| |
color index U-B: |
?
| |
color index B-V: |
0.91
[D05a]
| |
color index V-R: | 0.74 ± 0.08 [D05a] | |
color index B-R: | 1.65 [D05a] | |
color index V-I: | 1.17 ± 0.09 [D05a] | |
taxonomic type: |
?
| |
mass m: |
3.99x1018
± 6.7x1016
kg [G11a]
| |
density ρ: |
0.3
± 0.5/0.14
g/cm3[V14a]
| |
Hill radius rH: |
550000 km [*D]
|
other data, primary:
|
diameter dp: |
246
± 38/139
km [V14a]
| |
color index V-I: | 1.3 ± 0.16 [B08d] | |
rotation period RPp: |
?
| |
amplitude in mag., rotational ΔM: |
<0.3
[T14a]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
221
± 34/125
km [V14a]
| |
diameter ratio ds/dp: |
0.899
[G11a]
| |
component mag. difference ΔM: |
0.7
± 0.2
[N08c]
| |
color index V-I: | 1.39± 0.17 [B08d] | |
rotation period RPs: |
?
| |
|
|
--
(148780) Altjira
--discovery and notes:
Primary discovered
2001 Oct 20
from
Kitt Peak Observatory, Arizona, USA
by
Deep Ecliptic Survey.
Alternate designation(s):
2001 UQ18
.
Permanent number assigned 2007 Feb 02.
Named 2008 Jul 18 for the mythological Aboriginal god of the sky [MPC63642].
Companion discovered
2006 Aug 06
using
Hubble Space Telescope
observations from Hubble Space Telescope.
Announced
2007 Mar 14.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Grundy, W. M., Noll, K. S., Nimmo, F., Roe, H. G., Buie, M. W., Porter, S. B., Benecchi, S. D., Stephens, D. C., Levison, H. F., & Stansberry, J. A. 2011, Icarus Five new and three improved mutual orbits of transneptunian binaries
- Sheppard, Scott S. 2007, The Astronomical Journal Light Curves of Dwarf Plutonian Planets and other Large Kuiper Belt Objects: Their Rotations, Phase Functions, and Absolute Magnitudes
- Noll, Keith S., Grundy, William M., Chiang, Eugene I., Margot, Jean-Luc, & Kern, Susan D. 2007, ArXiv Astrophysics e-prints Binaries in the Kuiper Belt
- Sheppard, Scott S. 2007, ArXiv e-prints Light Curves of Dwarf Plutonian Planets and other Large Kuiper Belt Objects: Their Rotations, Phase Functions and Absolute Magnitudes
- Elliot, J. L., Kern, S. D., Washburn, K. E., Buie, M. W., Wasserman, L. H., Millis, R. L., & Marsden, B. G. 2001, Minor Planet Electronic Circulars 2001 UN18,
©
2007-2012, 2014
by Wm. Robert Johnston.
Last modified
20 September 2014.
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