Asteroids with Satellites Database--Johnston's Archive

(38628) Huya

compiled by Wm. Robert Johnston
last updated 22 February 2025

--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: 39.20078 AU
orbital period P: 245.4428 yr
(= 89647.97 d)
eccentricity e: 0.2722697
perihelion distance q: 28.527593 AU
aphelion distance Q: 49.87396 AU
inclination i: 15.4754989°
argument of perihelion ω: 67.70808°
ascending node Ω: 169.379614°
mean anomaly M: 14.29123°
perihelion passage TP: 2015 Jan 19.167
Epoch: 2024 Oct 17
data arc: 1996-2024 (894 obs.)
Earth MOID: 27.5503 AU
Jupiter Tisserand invariant TJ: 5.223
Neptune Tisserand invariant TN:2.885 [*D]


orbital data, secondary:
semimajor axis as: 1898 ± 22/21 km [R25b]
separation/primary radius as/rp:9.1 [*D]
separation/Hill radius as/rH:0.0023 [*D]
orbital period Ps: 3.46293 ± 0.00001 d [R25b]
eccentricity es: 0.036 ± 0.017/0.015 [R25b]
inclination is:65.8° ± 1.9° [R25b]
ascending node Ωs:122.9° ± 1.7/1.6° [R25b]
argument of pericenter ωs:101° ± 17/24° [R25b]
mean anomaly M:147° ± 23/17° [R25b]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 4.81 [MPC]
5.04 ± 0.03 [F13a]
slope parameter G: (0.15) [*A]
effective diameter dE: 458 ± 9.2/9.2 km [F13a]
geometric albedo: 0.083 ± 0.004/0.004 [F13a]
color index U-B: ?
color index B-V: 0.95 [M12a]
color index V-R:0.57 ± 0.09 [M12a]
color index B-R:1.54 ± 0.06 [M12a]
color index V-I:1.18 [M12a]
color index R-J:1.4 [*D]
color index V-J:1.97 ± 0.05 [M03c]
taxonomic type: ?
mass m: 4.52x1019 ± 1.6x1018/1.5x1018 kg [R25b]
density ρ: 1.073 ± 0.066 g/cm3[R25b]
Hill radius rH: 840000 km [*D]

other data, primary:
diameter dp: 415 km [*D]
dimensions :436.1 x 436.1 x 375 km [R25b]
axial ratios a/b, b/c:1, 1.16 [*D]
rotation period RPp: 6.725 h [R25b]
amplitude in mag., rotational ΔM: 0.02 ± 0.01 [T14a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 213 ± 30 km [F13a]
diameter ratio ds/dp: 0.51 [*D]
component mag. difference ΔM: 1.37 [R25b]
geometric albedo :0.15[]
rotation period RPs: ?

-- (38628) Huya --discovery and notes:

Primary discovered 2000 Mar 10 from Mérida, Venezuela by I. R. Ferrin. Alternate designation(s): 2000 EB173 . Linked to prediscovery observations from 1996 Apr 09. Permanent number assigned 2002 Mar 28.

Named 2003 May 01 for the Wayuu mythological god of rain/winter [MPC048397].

Companion discovered 2012 May 06 by K. S. Noll, W. M. Grundy, H. Schlichting, R. Murray-Clay, and S. D. Benecchi using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2012 Jul 12 [N12a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2012-2014, 2025 by Wm. Robert Johnston.
Last modified 22 February 2025.
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