Asteroids with Satellites Database--Johnston's Archive
(385446)
Manwe
and Thorondor
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, 4:7 resonance
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
43.635 AU
| |
orbital period P: |
288.246 yr
(= 105281.7 d)
| |
eccentricity e: |
0.11541
| |
perihelion distance q: |
38.599 AU
| |
aphelion distance Q: |
48.671 AU
| |
inclination i: |
2.666383°
| |
argument of perihelion ω: |
21.058°
| |
ascending node Ω: |
68.520°
| |
mean anomaly M: |
273.396°
| |
perihelion passage TP: |
2083 Sep 25
| |
Epoch: |
2014 May 23
| |
data arc: |
2003-2013
(54 obs.)
| |
Earth MOID: |
37.615 AU
| |
Jupiter Tisserand invariant TJ: |
5.866
|
| Neptune Tisserand invariant TN: | 3.08 [*D] |
orbital data, secondary:
|
semimajor axis as: |
6674
± 41 km
[G14a]
| |
separation/primary radius as/rp: | 83 [*D] | |
separation/Hill radius as/rH: | 0.017 [*D] | |
orbital period Ps: |
110.176
± 0.018
d [G14a]
| |
eccentricity es: |
0.5632
± 0.0070
[G14a]
| |
inclination is: | 25.58° ± 0.23° [G14a] | |
ascending node Ωs: | 163.56° ± 0.78° [G14a] | |
argument of pericenter ωs: | 250.8° ± 1.9° [G14a] | |
mean anomaly M: | 126.51° ± 0.49° [G14a] | |
Epoch: | 2007 Oct 26.5 | |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
6.5
[MPC]
7.15 [G14a]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
185
km [*D]
| |
geometric albedo: |
0.1
± 0.04
[G14a]
| |
color index U-B: |
?
| |
color index B-V: |
1.01
[G14a]
| |
color index V-R: | 0.61 ± 0.06 [S12f] | |
color index B-R: | 1.68 ± 0.07 [S12f] | |
color index V-I: | 1.22 [G14a] | |
taxonomic type: |
?
| |
mass m: |
1.94x1018
± 3.6x1016
kg [G14a]
| |
density ρ: |
(0.75
± 0.25
g/cm3) [*A]
| |
Hill radius rH: |
400000 km [*D]
|
other data, primary:
|
diameter dp: |
160
± 24/44
km [G14a]
| |
rotation period RPp: |
?
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
92
± 14/26
km [G14a]
| |
diameter ratio ds/dp: |
0.58
[G14a]
| |
component mag. difference ΔM: |
1.2
[G14a]
| |
rotation period RPs: |
?
| |
|
|
--
(385446) Manwe and Thorondor
--discovery and notes:
Primary discovered
2003 Aug 25
from
Cerro Tololo Observatory, La Serena, Chile
by
M. W. Buie.
Alternate designation(s):
2003 QW111
.
Permanent number assigned 2014 Feb 14.
Named 2014 Apr 15 for the king of Valar in J. R. R. Tolkien's fiction [MPC88005].
Companion discovered
2006 Jul 25
by K. S. Noll, W. M. Grundy, D. C. Stephens, and H. F. Levison
using
Hubble Space Telescope
observations from Hubble Space Telescope.
Announced
2006 Sep 07 [N06d].
Permanent designation I Thorondor, assigned 2014 Apr 15; named for the lord of the eagles in J. R. R. Tolkien's fiction [MPC88005].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Grundy, W. M., Benecchi, S. D., Porter, S. B., & Noll, K. S. 2014, ArXiv e-prints The Orbit of Transneptunian Binary Manw\"e and Thorondor and their Upcoming Mutual Events
- Grundy, W. M., Benecchi, S. D., Buie, M. W., Noll, K. S., Porter, S. B., Roe, H. G., Stansberry, J. A., & Trujillo, C. A. 2011, EPSC-DPS Joint Meeting 2011 A New NOAO Survey Program: Mutual Orbits and Masses of Kuiper Belt Binaries
- 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
- Buie, M. W., Elliot, J. L., Kane, J. F., Teyssier, M. E., Wasserman, L. H., Trilling, D. E., Crudo, R. A., Millis, R. L., Kern, S. D., Gulbis, A. A. S., Jones, T. A., Leung, M., Vax, A. L., Clancy, K. B., & Marsden, B. G. 2005, Minor Planet Electronic Circulars 2000 QE226, 2003 QW111
- Buie, M. W., Wasserman, L. H., Millis, R. L., Kern, S. D., Lundgren, E. W., Gulbisdgren, A. A. S., Kane, J. F., Elliot, J., Gulbis, A., Clancy, K., & Marsden, B. G. 2003, Minor Planet Electronic Circulars 2003 QW111
©
2006-2014, 2014
by Wm. Robert Johnston.
Last modified
20 September 2014.
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