Asteroids with Satellites Database--Johnston's Archive
(26416)
1999 XM84
compiled by Wm. Robert Johnston
last updated
29 May 2019
--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
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
2.342614127 AU
| |
orbital period P: |
3.585511642 yr
(= 1309.632861 d)
| |
eccentricity e: |
0.051129417
| |
perihelion distance q: |
2.22283763 AU
| |
aphelion distance Q: |
2.462390622 AU
| |
inclination i: |
4.5276043°
| |
argument of perihelion ω: |
285.714522°
| |
ascending node Ω: |
263.060576°
| |
mean anomaly M: |
339.185955°
| |
perihelion passage TP: |
2015 Feb 22.71877
| |
Epoch: |
2014 Dec 09
| |
data arc: |
1994-2015
(967 obs.)
| |
Earth MOID: |
1.22864 AU
| |
Jupiter Tisserand invariant TJ: |
3.557
|
orbital data, secondary:
|
semimajor axis as: |
8.8
km
[*E]
| |
separation/primary radius as/rp: | 4 [*E] | |
separation/Hill radius as/rH: | 0.011 [*E] | |
orbital period Ps: |
0.865
± 0.0004
d [W17a]
| |
eccentricity es: |
0
[P15f]
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
14.3
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
4.56
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: |
770 km [*E]
|
other data, primary:
|
diameter dp: |
4.4
km [*E]
| |
rotation period RPp: |
2.907
± 0.001
h [P14a]
| |
amplitude in mag., rotational ΔM: |
0.2
± 0.03
[P14a]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.19
km [*E]
| |
diameter ratio ds/dp: |
0.27
± 0.02
[W17a]
| |
component mag. difference ΔM: |
2.84
± 0.16
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(26416) 1999 XM84
--discovery and notes:
Primary discovered
1999 Dec 07
from
Socorro, New Mexico, USA
by
LINEAR Program.
Alternate designation(s):
1994 NL12, 1999 XL95.
Linked to prediscovery observations from 1994 Jul 08.
Permanent number assigned 2001 Jul 05.
Companion discovered
2014
by P. Pravec, P. Kusnirak, K. Nornoch, A. Galad, and J. Zizka
using
lightcurve
observations.
Announced
2015 Apr 02 [P15b].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2015, 2019
by Wm. Robert Johnston.
Last modified
29 May 2019.
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