Asteroids with Satellites Database--Johnston's Archive
(21149)
Kenmitchell
compiled by Wm. Robert Johnston
last updated
18 December 2023
--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:
main belt asteroid, inner
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
1.9324084916 AU
| |
orbital period P: |
2.686312965 yr
(= 981.1758105 d)
| |
eccentricity e: |
0.0353714509
| |
perihelion distance q: |
1.8640563995 AU
| |
aphelion distance Q: |
2.0007605837 AU
| |
inclination i: |
23.94049734°
| |
argument of perihelion ω: |
128.8293259°
| |
ascending node Ω: |
170.6296542°
| |
mean anomaly M: |
29.9361842°
| |
perihelion passage TP: |
2023 Jun 23.409278
| |
Epoch: |
2023 Sep 13
| |
data arc: |
1950-2023
(3556 obs.)
| |
Earth MOID: |
0.876667 AU
| |
Jupiter Tisserand invariant TJ: |
3.806
|
orbital data, secondary:
|
semimajor axis as: |
5.5
km
[*E]
| |
separation/primary radius as/rp: | 3.7 [*E] | |
separation/Hill radius as/rH: | 0.012 [*E] | |
orbital period Ps: |
0.7508
± 0.0008
d [W23f]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
15.12
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
3.1
km [*E]
| |
geometric albedo: |
(0.16
) [*A]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
450 km [*E]
|
other data, primary:
|
diameter dp: |
3.0
km [*E]
| |
rotation period RPp: |
2.498
± 0.0005
h [W23f]
| |
amplitude in mag., rotational ΔM: |
0.09
[W23f]
| |
amplitude in mag., mutual events ΔM: | 0.26 [W23f] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
>0.9
km [*E]
| |
diameter ratio ds/dp: |
>0.29
± 0.02
[W23f]
| |
component mag. difference ΔM: |
<2.7
± 0.1
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(21149) Kenmitchell
--discovery and notes:
Primary discovered
1993 Apr 19
from
Palomar Observatory, California, USA
by
C. S. Shoemaker and E. M. Shoemaker.
Alternate designation(s):
1993 HY5,
1999 RX40.
Linked to prediscovery observations from 1950 Apr 18.
Permanent number assigned 2001 Feb 08.
Named 2003 May 01 for Ken Mitchell (1947-) [MPC048396].
Companion discovered
2023 Jul 20
by B. D. Warner
using
lightcurve
observations from Palmer Divide Observatory, Colorado Springs, Colorado, USA.
Announced
2023 Dec 18 [W23f].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2023
by Wm. Robert Johnston.
Last modified
18 December 2023.
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