Asteroids with Satellites Database--Johnston's Archive

(4030) Archenhold

compiled by Wm. Robert Johnston
last updated 9 October 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: 2.4598811302 AU
orbital period P: 3.858152446 yr
(= 1409.1901809 d)
eccentricity e: 0.092868017
perihelion distance q: 2.231436849 AU
aphelion distance Q: 2.6883254116 AU
inclination i: 6.53189216°
argument of perihelion ω: 302.696394°
ascending node Ω: 342.2955458°
mean anomaly M: 131.1115247°
perihelion passage TP: 2020 Feb 03.774797
Epoch: 2021 Jul 01
data arc: 1955-2021 (2819 obs.)
Earth MOID: 1.22298 AU
Jupiter Tisserand invariant TJ: 3.476


orbital data, secondary:
semimajor axis as: 12 km [*E]
separation/primary radius as/rp:3.6 [*E]
separation/Hill radius as/rH:0.010 [*E]
orbital period Ps: 0.66558 ± 0.00012 d [W21f]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.14 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6.97 ± 0.08 km [M**]
geometric albedo: 0.251 ± 0.02 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1200 km [*E]

other data, primary:
diameter dp: 6.66 ± 0.08 km [*D]
rotation period RPp: 3.27292 ± 0.00004 h [W21f]
amplitude in mag., rotational ΔM: 0.18 [W21f]
amplitude in mag., mutual events ΔM:0.125 ±0.025 [W21f]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >2.06 km [*D]
diameter ratio ds/dp: >0.31 [W21b]
component mag. difference ΔM: <2.54 [*D]
rotation period RPs: ?

-- (4030) Archenhold --discovery and notes:

Primary discovered 1984 Mar 02 from European Southern Observatory, La Silla, Chile by H. Debehogne. Alternate designation(s): 1984 EO1, 1970 SO, 1980 DP2, 1980 ET. Linked to prediscovery observations from 1955 Nov 11. Permanent number assigned 1989 Mar 22.

Named 1999 Apr 02 for Friedrich Simon Archenhold (1861-1939) [MPC034340].

Companion discovered 2020 Aug 28 by B. D. Warner, R. D. Stephens, and A. W. Harris using lightcurve observations from Center for Solar System Studies, Landers, California, USA. Announced 2021 Jan [W21f].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2021, 2021 by Wm. Robert Johnston.
Last modified 9 October 2021.
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