Asteroids with Satellites Database--Johnston's Archive

(16694) 1995 AJ

compiled by Wm. Robert Johnston
last updated 14 February 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: main belt asteroid


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.2377735795 AU
orbital period P: 3.3475279591 yr
(= 1222.7076794 d)
eccentricity e: 0.207285085
perihelion distance q: 1.773916492 AU
aphelion distance Q: 2.7016306668 AU
inclination i: 6.4189477°
argument of perihelion ω: 39.47648°
ascending node Ω: 286.018532°
mean anomaly M: 347.4134977°
perihelion passage TP: 2020 Jul 12.748925
Epoch: 2020 May 31
data arc: 1989-2020 (2381 obs.)
Earth MOID: 0.767088 AU
Jupiter Tisserand invariant TJ: 3.6


orbital data, secondary:
semimajor axis as: 9 km [*E]
separation/primary radius as/rp:4.5 [*E]
separation/Hill radius as/rH:0.016 [*E]
orbital period Ps: 1.0533 ± 0.0008 d [B20c]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 14 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.06 ± 0.03 km [M**]
geometric albedo: 0.386 ± 0.048 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 550 km [*E]

other data, primary:
diameter dp: 3.96 km [*D]
rotation period RPp: 3.6421 ± 0.0003 h [B20c]
amplitude in mag., rotational ΔM: 0.1 [B20c]
amplitude in mag., mutual events ΔM:0.06 [B20c]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >0.91 km [*D]
diameter ratio ds/dp: >0.23 [B20c]
component mag. difference ΔM: <3.2 [B20c]
rotation period RPs: ?

-- (16694) 1995 AJ --discovery and notes:

Primary discovered 1995 Jan 02 from Oizumi, Japan by T. Kobayashi. Alternate designation(s): 1990 TH15. Linked to prediscovery observations from 1989 Mar 09. Permanent number assigned 2000 Sep 13.

Companion discovered 2020 Dec by V. Benishek, et al. using lightcurve observations. Announced 2020 Dec 23 [B20c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2021 by Wm. Robert Johnston.
Last modified 14 February 2021.
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