Asteroids with Satellites Database--Johnston's Archive
(8026)
Johnmckay
compiled by Wm. Robert Johnston
last updated
21 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:
main belt asteroid, Hungaria
orbital data, primary (osculating elements)
[JPL]
:
semimajor axis a: |
1.925339521 AU
|
orbital period P: |
2.671586196 yr (= 975.7968581 d)
|
eccentricity e: |
0.07492829
|
perihelion distance q: |
1.78107713 AU
|
aphelion distance Q: |
2.069601917 AU
|
inclination i: |
19.932288°
|
argument of perihelion ω: |
145.807757°
|
ascending node Ω: |
217.736260°
|
mean anomaly M: |
98.495429°
|
perihelion passage TP: |
2013 Aug 29.0235
|
Epoch: |
2014 May 23
|
data arc: |
1989-2014
(659 obs.)
|
Earth MOID: |
0.7992 AU
|
Jupiter Tisserand invariant TJ: |
3.843
|
orbital data, secondary:
semimajor axis as: |
?
|
orbital period Ps: |
?
|
eccentricity es: |
?
|
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
absolute mag. H: |
14.8
[MPC]
|
slope parameter G: |
(0.15) [*A]
|
effective diameter dE: |
1.69
± 0.24
km [M11b]
|
geometric albedo: |
0.815
± 0.196
[M11b]
|
color index U-B: |
?
|
color index B-V: |
?
|
taxonomic type: |
?
|
mass m: |
?
|
density ρ: |
(1.6
g/cm3) [*A]
|
Hill radius rH: |
230 km [*E]
|
other data, primary:
diameter dp: |
1.69
± 0.24
km [M11b]
|
rotation period RPp: |
372
± 5
h [W11a]
|
amplitude in mag., rotational ΔM: |
0.12
[W10e]
|
amplitude in mag., mutual events ΔM: | 0.40 [W10e] |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
diameter ds: |
?
|
diameter ratio ds/dp: |
?
|
component mag. difference ΔM: |
?
|
rotation period RPs: |
2.300
± 0.001
h [W10e]
|
|
|
--
(8026) Johnmckay
--discovery and notes:
Primary discovered
1991 May 08
from
Palomar Observatory, California, USA
by
E. F. Helin.
Alternate designation(s):
1991 JA1,
1989 UF2.
Linked to prediscovery observations from 1989 Oct 27.
Permanent number assigned 1997 Nov 14.
Named 2012 Mar 08 for John McKay (1922-1975) [MPC78269].
Companion discovered
2010 Jul 11
using
lightcurve
observations.
Announced
2010 Aug 06.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2010-2013, 2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.