Asteroids with Satellites Database--Johnston's Archive
(341520)
Mors-Somnus
compiled by Wm. Robert Johnston
last updated
6 June 2015
--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, plutino
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
39.32345656 AU
| |
orbital period P: |
246.5958314 yr
(= 90069.12741 d)
| |
eccentricity e: |
0.266606565
| |
perihelion distance q: |
28.83956489 AU
| |
aphelion distance Q: |
49.80734823 AU
| |
inclination i: |
11.2856433°
| |
argument of perihelion ω: |
205.7261065°
| |
ascending node Ω: |
196.7161545°
| |
mean anomaly M: |
355.4641997°
| |
perihelion passage TP: |
2017 Jun 30
| |
Epoch: |
2014 May 23
| |
data arc: |
2007-2012
(37 obs.)
| |
Earth MOID: |
27.8508 AU
| |
Jupiter Tisserand invariant TJ: |
5.329
|
| Neptune Tisserand invariant TN: | 2.92640993344029 [*D] |
orbital data, secondary:
|
semimajor axis as: |
21040
± 70 km
[G14a]
| |
separation/primary radius as/rp: | 410 [*D] | |
#DIV/0!
orbital period Ps: |
971.7
± 0.5
d [G14a]
| |
eccentricity es: |
0.1492
± 0.0006
[G14a]
| |
inclination is: | 15.68° ± 0.22° [S12b] | |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
6.8
[MPC]
6.94 ± 0.02 [S12b]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
141
km [S12b]
| |
geometric albedo: |
0.23
[S12b]
| |
color index U-B: |
?
| |
color index B-V: |
1.29
[S12b]
| |
color index V-R: | 0.74 ± 0.01 [S12b] | |
color index B-R: | 2.03 ± 0.01 [S12b] | |
color index V-I: | 1.37 ± 0.02 [S12b] | |
taxonomic type: |
?
| |
mass m: |
7.81x1017
± 9x1015
kg [G14a]
| |
density ρ: |
(0.75
g/cm3) [*A]
| |
Hill radius rH: |
0 km [*D]
|
other data, primary:
|
diameter dp: |
102
km [*D]
| |
rotation period RPp: |
9.28
h [T14a]
| |
amplitude in mag., rotational ΔM: |
0.24
± 0.05
[T14a]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
97
km [*D]
| |
diameter ratio ds/dp: |
0.955
[S12b]
| |
component mag. difference ΔM: |
0.05
± 0.05
[S08c]
| |
rotation period RPs: |
?
| |
|
|
--
(341520) Mors-Somnus
--discovery and notes:
Primary discovered
2007 Oct 14
from
Mauna Kea Observatory, Hawaii, USA
by
S. S. Sheppard and C. A. Trujillo.
Alternate designation(s):
2007 TY430
.
Permanent number assigned 2012 Oct 29.
Named 2015 Jun 02 for the mythological Roman god of the underworld and death [MPC94392].
Companion discovered
2007 Oct 14
by S. S. Sheppard and C. A. Trujillo
using
adaptive optics telescope
observations from Subaru/Gemini/Magellen telescopes, Mauna Kea, Hawaii, USA.
Announced
2008 Aug 01 [S08c].
Permanent designation I Somnus, assigned 2015 Jun 02; named for the mythological Roman god of the underworld and sleep [MPC94392].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2008-2014, 2015
by Wm. Robert Johnston.
Last modified
6 June 2015.
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