Asteroids with Satellites Database--Johnston's Archive

(326732) 2003 HB6

compiled by Wm. Robert Johnston
last updated 25 September 2021

--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: NEA, Amor


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.7118084242 AU
orbital period P: 4.4656893464 yr
(= 1631.1238396 d)
eccentricity e: 0.571221949
perihelion distance q: 1.162763932 AU
aphelion distance Q: 4.2608529165 AU
inclination i: 6.6205172°
argument of perihelion ω: 145.846876°
ascending node Ω: 161.613498°
mean anomaly M: 354.0117441°
perihelion passage TP: 2021 Jul 28.1321860
Epoch: 2021 Jul 01
data arc: 2003-2021 (2810 obs.)
Earth MOID: 0.161719 AU
Jupiter Tisserand invariant TJ: 3.096


orbital data, secondary:
semimajor axis as: 2 km [*E]
separation/primary radius as/rp:4.3 [*E]
separation/Hill radius as/rH:0.024 [*E]
orbital period Ps: 0.955 ± 0.002 d [P21g]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 17.71 [MPC]
17.42 ± 0.04 [P21g]
slope parameter G: (0.24) [*A]
effective diameter dE: 0.95 km [*E]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: ?
color index V-R:0.429 ± 0.01 [P21g]
taxonomic type: L? (SMASSII) [P21g]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 84 km [*E]

other data, primary:
diameter dp: 0.93 km [*E]
rotation period RPp: 3.463 ± 0.0008 h [P21g]
amplitude in mag., rotational ΔM: 0.08 [P21g]
amplitude in mag., mutual events ΔM:0.085 ±0.025 [P21g]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.21 km [*E]
axial ratios a/b, b/c:1.4;? []
diameter ratio ds/dp: 0.23 ± 0.02 [P21g]
component mag. difference ΔM: 3.19 ± 0.19 [*D]
rotation period RPs: 22.92 ± 0.05 h [P21g]

-- (326732) 2003 HB6 --discovery and notes:

Primary discovered 2003 Apr 25 from Anderson Mesa Station, Flagstaff, Arizona, USA by LONEOS Program. Linked to prediscovery observations from 2003 Mar 26. Permanent number assigned 2012 May 06.

Companion discovered 2021 Aug 10 by P. Pravec, K. Hornoch, H. Kucakova, P. Kusnirak, P. Fatka, E. Jehin, M. Ferrais, M. Devogele, T. Kareta, N. Moskovitz using lightcurve observations from Ondrejov Observatory, Czech Republic; La Sille Station, European Southern Observatory. Announced 2021 Sep 18 [P21g].

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© 2021 by Wm. Robert Johnston.
Last modified 25 September 2021.
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