Asteroids with Satellites Database--Johnston's Archive

(27675) 1981 CH

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: 2.352093428 AU
orbital period P: 3.607296602 yr
(= 1317.5899683 d)
eccentricity e: 0.19043028
perihelion distance q: 1.90418362 AU
aphelion distance Q: 2.800003238 AU
inclination i: 24.6947625°
argument of perihelion ω: 186.35691°
ascending node Ω: 316.262148°
mean anomaly M: 349.063465°
perihelion passage TP: 2017 Mar 28.027414
Epoch: 2017 Feb 16
data arc: 1981-2017 (849 obs.)
Earth MOID: 0.918775 AU
Jupiter Tisserand invariant TJ: 3.412


orbital data, secondary:
semimajor axis as: ?
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 5.09 ± 0.2 km [JPL]
geometric albedo: 0.238 ± 0.037 [JPL]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 750 km [*E]

other data, primary:
diameter dp: 5.09 ± 0.2 km [JPL]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: ?
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
rotation period RPs: ?

-- (27675) 1981 CH --discovery and notes:

Primary discovered 1981 Feb 02 from Klet, Czech Republic by L. Brozek. Alternate designation(s): 1999 BO12. Permanent number assigned 2001 Sep 02.

Companion discovered 2017 by D. Pray, P. Pravec, H. Kucakova, K. Hornoch, P. Kusnirak, J. Vrastil, A. Carbognani, A. Aznar, V. Benishek, W. Cooney, J. Gross, D. Terrell, R. Montaigut, and A. Leroy using lightcurve observations. Announced 2017 Feb 14 [P17b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2017 by Wm. Robert Johnston.
Last modified 19 February 2017.
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