Asteroids with Satellites Database--Johnston's Archive

(2019) van Albada

compiled by Wm. Robert Johnston
last updated 3 November 2019

--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: 2.2410325261 AU
orbital period P: yr
(= 1225.3796585 d)
eccentricity e: 0.165229513
perihelion distance q: 1.870747813 AU
aphelion distance Q: 2.6113172396 AU
inclination i: 4.0443152°
argument of perihelion ω: 24.790306°
ascending node Ω: 252.19177°
mean anomaly M: 38.216399°
perihelion passage TP: 2018 Dec 17.917783
Epoch: 2019 Apr 27
data arc: 1931-2019 (2254 obs.)
Earth MOID: 0.854762 AU
Jupiter Tisserand invariant TJ: 3.613


orbital data, secondary:
semimajor axis as: 14 km [*E]
separation/primary radius as/rp:3.7 [*E]
separation/Hill radius as/rH:0.013 [*E]
orbital period Ps: 0.74925 ± 0.00012 d [B19f]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.3 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 7.86 ± 0.06 km [M**]
geometric albedo: 0.496 ± 0.04 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: S (SMASSII) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1100 km [*E]

other data, primary:
diameter dp: 7.61 km [*D]
rotation period RPp: 2.7294 ± 0.0005 h [B19f]
amplitude in mag., rotational ΔM: 0.16 [B19f]
amplitude in mag., mutual events ΔM:0.095 ±0.025 [B19f]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >1.98 km [*D]
diameter ratio ds/dp: >0.26 [B19f]
component mag. difference ΔM: <2.9 [*D]
rotation period RPs: ?

-- (2019) van Albada --discovery and notes:

Primary discovered 1935 Sep 28 from Johannesburg, South Africa by H. van Gent. Alternate designation(s): 1935 SX1, 1931 JN, 1941 HS, 1964 DG, 1971 HB, 1975 ND, 1975 PL, A911 KD. Linked to prediscovery observations from 1931 May 06. Permanent number assigned -.

Named 1991 Apr 28 for G. B. van Albada (1911-1972) [MPC018135].

Companion discovered 2019 Sep 22 by V. Benishek, P. Pravec, R. Durkee, M. Husarik, M. Pikler, G. Cervak, D. Tomko, B. Christmann, A. Aznar, D. Pray, F. Pilcher, V. Chiorny, A. Marchini, R. Papini, F. Salvaggio using lightcurve observations from Sopot Observatory, Serbia; Shed of Science South Observatory; Skalnate Pleso Observatory; Soucieu-en-Jarrest; Isaac Aznar Observatory; Sugarloaf Mountain Observatory; Organ Mesa Observatory; Chuguev station, Kharkiv Observatory, Ukraine; Astronomical Observatory of the University of Siena. Announced 2019 Oct 30 [B19f].

--Links, more technical:

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--Links to ADS abstracts:


© 2019 by Wm. Robert Johnston.
Last modified 3 November 2019.
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