Asteroids with Satellites Database--Johnston's Archive

(208996) 2003 AZ84

compiled by Wm. Robert Johnston
last updated 20 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: TNO, plutino


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 39.6805 AU
orbital period P: 249.962 yr
(= 91298.6 d)
eccentricity e: 0.174435
perihelion distance q: 32.7588 AU
aphelion distance Q: 46.6022 AU
inclination i: 13.54750°
argument of perihelion ω: 14.000°
ascending node Ω: 251.95284°
mean anomaly M: 226.659°
perihelion passage TP: 2106 Dec 23
Epoch: 2014 May 23
data arc: 1996-2014 (103 obs.)
Earth MOID: 31.7444 AU
Jupiter Tisserand invariant TJ: 5.418
Neptune Tisserand invariant TN:2.96 [*D]


orbital data, secondary:
semimajor axis as: 7200 ± 300 km (separation) [B07d]
separation/primary radius as/rp:20 [*E]
separation/Hill radius as/rH:0.0048 [*E]
orbital period Ps: 12 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 3.8 [MPC]
3.74 ± 0.08 [M12a]
slope parameter G: (0.15) [*A]
effective diameter dE: 727 ± 61.9/66.5 km [M12a]
geometric albedo: 0.107 ± 0.023/0.016 [M12a]
color index U-B: ?
color index B-V: 0.65 [F04a]
color index V-R:0.39 ± 0.03 [F04a]
color index B-R:1.04 ± 0.03 [F04a]
color index V-I:0.75 ± 0.03 [F04a]
color index R-J:0.82 ± 0.06 [P10a]
color index V-J:1.21 ± 0.05 [D09c]
color index J-H:0.34 ± 0.08 [P10a]
color index V-H:1.52 ± 0.05 [D09c]
taxonomic type: BB (G-mode) [P10a]
mass m: ?
density ρ: >0.85 g/cm3[T10a]
Hill radius rH: 1500000 km [*E]

other data, primary:
diameter dp: 723 ± 64 km [*D]
rotation period RPp: 13.44 ± 0.1 h [S03a]
amplitude in mag., rotational ΔM: 0.07 ± 0.01 [T10a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 72 ± 12 km [*D]
diameter ratio ds/dp: 0.1 ± 0.014 [B07d]
component mag. difference ΔM: 5.0 ± 0.3 [I8812]
rotation period RPs: ?

-- (208996) 2003 AZ84 --discovery and notes:

Primary discovered 2003 Jan 13 from Palomar Observatory, California, USA by C. A. Trujillo and M. E. Brown. Linked to prediscovery observations from 1996 Mar 19. Permanent number assigned 2009 Mar 11.

Companion discovered 2005 Dec 02 by M. E. Brown and T.-A. Suer using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2007 Feb 22 [B07d].

--Links, more technical:

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--Links to ADS abstracts:


© 2007-2009, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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