Asteroids with Satellites Database--Johnston's Archive
2021 DN15
compiled by Wm. Robert Johnston
last updated
24 December 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
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
43.74 AU
| |
orbital period P: |
289.3 yr
(= 105666 d)
| |
eccentricity e: |
0.04
| |
perihelion distance q: |
42 AU
| |
aphelion distance Q: |
45.5 AU
| |
inclination i: |
2.847°
| |
argument of perihelion ω: |
292°
| |
ascending node Ω: |
133.064°
| |
mean anomaly M: |
53°
| |
perihelion passage TP: |
1978 Jun 21
| |
Epoch: |
2021 Apr 07
| |
data arc: |
2021 Feb-Dec
(9 obs.)
| |
Earth MOID: |
40.998 AU
| |
Jupiter Tisserand invariant TJ: |
5.906
|
| Neptune Tisserand invariant TN: | 3.095 [*D] |
orbital data, secondary:
|
semimajor axis as: |
31900
km
(separation)
[S21d]
| |
separation/primary radius as/rp: | 500 [*E] | |
separation/Hill radius as/rH: | 0.070 [*E] | |
orbital period Ps: |
1100
d [*E]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
6.98 ± 0.08 [JPL]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
177
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: |
460000 km [*E]
|
other data, primary:
|
diameter dp: |
128
km [*E]
| |
rotation period RPp: |
?
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
122
km [*E]
| |
diameter ratio ds/dp: |
0.95
[*D]
| |
component mag. difference ΔM: |
0.1
[S21d]
| |
rotation period RPs: |
?
| |
|
|
--
2021 DN15
--discovery and notes:
Primary discovered
2021 Feb 17
from
Subaru Telescope, Mauna Kea Observatory, Hawaii, USA
by
?.
Companion discovered
2021 Feb 17
by S. S. Sheppard, D. J. Tholen, and C. A. Trujillo
using
adaptive optics telescope
observations from Subaru Telescope, Mauna Kea Observatory, Hawaii, USA.
Announced
2021 Dec 19 [S21d].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2021
by Wm. Robert Johnston.
Last modified
24 December 2021.
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