Asteroids with Satellites Database--Johnston's Archive

(20325) Julianoey

compiled by Wm. Robert Johnston
last updated 19 February 2017

--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: 2.378629142 AU
orbital period P: 3.668513343 yr
(= 1339.949806 d)
eccentricity e: 0.076478504
perihelion distance q: 2.19671514 AU
aphelion distance Q: 2.560543142 AU
inclination i: 6.1028942°
argument of perihelion ω: 256.319553°
ascending node Ω: 98.235495°
mean anomaly M: 71.285368°
perihelion passage TP: 2014 Mar 18.6700
Epoch: 2014 Dec 09
data arc: 1954-2013 (1065 obs.)
Earth MOID: 1.20093 AU
Jupiter Tisserand invariant TJ: 3.528


orbital data, secondary:
semimajor axis as: 10 km [*E]
separation/primary radius as/rp:4.2 [*E]
separation/Hill radius as/rH:0.012 [*E]
orbital period Ps: 0.981 d [W17a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.1 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.94 ± 1.01 km [M11b]
geometric albedo: 0.416 ± 0.172 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 820 km [*E]

other data, primary:
diameter dp: 4.73 km [*D]
rotation period RPp: 3.24474 h [W17a]
amplitude in mag., rotational ΔM: 0.13 [W17a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.42 km [*D]
diameter ratio ds/dp: 0.3 [W17a]
component mag. difference ΔM: ?
rotation period RPs: ?

-- (20325) Julianoey --discovery and notes:

Primary discovered 1998 Apr 21 from Kitt Peak Observatory, Arizona, USA by Spacewatch Program. Alternate designation(s): 1998 HO27, 1977 TT6, 2004 BB159. Linked to prediscovery observations from 1954 May 28. Permanent number assigned 2001 Jan 09.

Companion discovered 2014 by D. Pray, P. Pravec, V. Benishek, J. Pollock, W. Cooney, J. Gross, D. Terrell, D. E. Reichart, J. B. Haislip, A. P. LaCluyze, A. Verveer and T. Spuck using lightcurve observations. Announced 2014 Dec 24 [P14d].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2014-2016, 2017 by Wm. Robert Johnston.
Last modified 19 February 2017.
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