Asteroids with Satellites Database--Johnston's Archive

(22569) 1998 HK36

compiled by Wm. Robert Johnston
last updated 30 September 2023

--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: 2.2865192062 AU
orbital period P: 3.457566031 yr
(= 1262.8759928 d)
eccentricity e: 0.2063145105
perihelion distance q: 1.8147771154 AU
aphelion distance Q: 2.7582612971 AU
inclination i: 4.027820526°
argument of perihelion ω: 287.9514623°
ascending node Ω: 49.9144281°
mean anomaly M: 7.2180968°
perihelion passage TP: 2023 Aug 18.6789966
Epoch: 2023 Sep 13
data arc: 1978-2023 (2585 obs.)
Earth MOID: 0.810167 AU
Jupiter Tisserand invariant TJ: 3.57

orbital data, secondary:
semimajor axis as: 6.4 km [*E]
separation/primary radius as/rp:3.3 [*E]
separation/Hill radius as/rH:0.009 [*E]
orbital period Ps: 0.6408 ± 0.0004 d [B23o]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 14.55 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.06 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: 700 km [*E]

other data, primary:
diameter dp: 3.91 km [*E]
rotation period RPp: 2.75221 ± 0.00013 h [B23o]
amplitude in mag., rotational ΔM: 0.09 [B23o]
amplitude in mag., mutual events ΔM:0.12 ±0.04 [B23o]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >1.09 km [*E]
diameter ratio ds/dp: >0.28 [B23o]
component mag. difference ΔM: <2.8 [*D]
rotation period RPs: ?

-- (22569) 1998 HK36 --discovery and notes:

Primary discovered 1998 Apr 20 from Socorro, New Mexico, USA by LINEAR Program. Alternate designation(s): 1978 QD3, 1985 SC. Linked to prediscovery observations from 1978 Aug 22. Permanent number assigned 2001 Mar 09.

Companion discovered 2023 Aug 26 by V. Benishek, P. Pravec, and J. Oey using lightcurve observations from Sopot Observatory, Serbia; Blue Mountains Observatory, Leura, New South Wales, Australia. Announced 2023 Sep 28 [B23o].

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© 2023 by Wm. Robert Johnston.
Last modified 30 September 2023.
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