Asteroids with Satellites Database--Johnston's Archive

(26416) 1999 XM84

compiled by Wm. Robert Johnston
last updated 18 May 2015

--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: ?
orbital period Ps: ?
eccentricity es: ?
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: 0 km [*E]

other data, primary:
diameter dp: 4.56 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: ?
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
rotation period RPs: ?

-- (26416) 1999 XM84 --discovery and notes:

Primary discovered 1999 Dec 07 from Socorro, New Mexico, USA by LINEAR. Alternate designation(s): 1994 NL12, 1999 XL95. Linked to prediscovery observations from 1994 Jul 08. Permanent number assigned 2001 Jul 05.

Companion discovered 2015? 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 by Wm. Robert Johnston.
Last modified 18 May 2015.
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