Asteroids with Satellites Database--Johnston's Archive

(9474) Cassadrury

compiled by Wm. Robert Johnston
last updated 1 February 2020

--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: 2.2864436628 AU
orbital period P: 3.4573293855 yr
(= 1262.8134078 d)
eccentricity e: 0.18337976
perihelion distance q: 1.86715617 AU
aphelion distance Q: 2.7057311525 AU
inclination i: 5.027092°
argument of perihelion ω: 155.858136°
ascending node Ω: 210.620843°
mean anomaly M: 324.3325505°
perihelion passage TP: 2019 Aug 30.114815
Epoch: 2019 Apr 27
data arc: 1981-2019 (1573 obs.)
Earth MOID: 0.866516 AU
Jupiter Tisserand invariant TJ: 3.574


orbital data, secondary:
semimajor axis as: 8 km [*E]
separation/primary radius as/rp:4.8 [*E]
separation/Hill radius as/rH:0.016 [*E]
orbital period Ps: 1.1177 ± 0.0003 d [C20a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 14.3 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 3.57 ± 0.16 km [M**]
geometric albedo: 0.152 ± 0.025 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 490 km [*E]

other data, primary:
diameter dp: 3.35 km [*D]
rotation period RPp: 2.7952 ± 0.001 h [C20a]
amplitude in mag., rotational ΔM: 0.11 [C20a]
amplitude in mag., mutual events ΔM:0.22 ±0.08 [C20a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >1.24 km [*D]
diameter ratio ds/dp: >0.37 [C20a]
component mag. difference ΔM: 2.2 ± 0 [*D]
rotation period RPs: 26.824 ± 0.006 h [C20a]

-- (9474) Cassadrury --discovery and notes:

Primary discovered 1998 Aug 17 from Socorro, New Mexico, USA by LINEAR Program. Alternate designation(s): 1998 QK15, 1981 UD14, 1981 UE1, 1988 XG4, 1997 EG48, 1997 HB1. Linked to prediscovery observations from 1981 Oct 23. Permanent number assigned 1998 Oct 05.

Named 2012 Oct 29 for Cassa Frances Drury (1999-) [MPC081059].

Companion discovered 2019 Nov by M. Conjat, R. Montaigut, D. Augustin, R. Behrend, A. Wuensche, M. Bretton, H. Boussier, D. Starkey, J. Ruiz, and F. Soldan using lightcurve observations from Nice Observatory, France; Deep Sky Chile Observatory, Chile; e-EyE Observatory, Spain; Observatoire des Baronnies Provencales, France; Micro Paolmar Observatory, France; DeKalb Observatory, USA; Observatorio de Cantabria, Spain; Observatorio Amanecer de Arrakis, Spain. Announced 2020 Jan 23 [C20a].

--Links, more technical:

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--Links to ADS abstracts:


© 2020 by Wm. Robert Johnston.
Last modified 1 February 2020.
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