Asteroids with Satellites Database--Johnston's Archive
(458732)
2011 MD5
compiled by Wm. Robert Johnston
last updated
3 September 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:
NEA, Apollo
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
2.48680943 AU
| |
orbital period P: |
3.921678258 yr
(= 1432.3929839 d)
| |
eccentricity e: |
0.603252467
| |
perihelion distance q: |
0.986635506 AU
| |
aphelion distance Q: |
3.986983354 AU
| |
inclination i: |
10.5583569°
| |
argument of perihelion ω: |
224.845828°
| |
ascending node Ω: |
170.343285°
| |
mean anomaly M: |
350.68354°
| |
perihelion passage TP: |
2023 Oct 20.068977
| |
Epoch: |
2023 Sep 13
| |
data arc: |
2011-2023
(463 obs.)
| |
Earth MOID: |
0.0602201 AU
| |
Jupiter Tisserand invariant TJ: |
3.176
|
orbital data, secondary:
|
semimajor axis as: |
1.4
km
[*E]
| |
separation/primary radius as/rp: | 3.4 [*E] | |
separation/Hill radius as/rH: | 0.022 [*E] | |
orbital period Ps: |
0.6317
± 0.0008
d [P23b]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
17.91
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
0.87
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: |
65 km [*E]
|
other data, primary:
|
diameter dp: |
0.84
km [*E]
| |
rotation period RPp: |
3.135
± 0.0006
h [P23b]
| |
amplitude in mag., rotational ΔM: |
0.15
[P23b]
| |
amplitude in mag., mutual events ΔM: | 0.125 ±0.035 [P23b] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
0.24
km [*E]
| |
diameter ratio ds/dp: |
0.29
± 0.02
[P23b]
| |
component mag. difference ΔM: |
2.7
± 0.1
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(458732) 2011 MD5
--discovery and notes:
Primary discovered
2011 Jun 30
from
Haleakala, Hawaii, USA
by
PanSTARRS 1 program.
Permanent number assigned 2016 Feb 22.
Companion discovered
2023 Aug 07
by Pravec, P., K. Hornoch, H. Kucakova, P. Fatka, K. Ergashev, and O. Burkhonov
using
lightcurve
observations from Ondrejov Observatory; Maidanak Observatory.
Announced
2023 Aug 24 [P23b].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2023
by Wm. Robert Johnston.
Last modified
3 September 2023.
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