Asteroids with Satellites Database--Johnston's Archive

(88710) 2001 SL9

compiled by Wm. Robert Johnston
last updated 20 September 2014

--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: NEA, Apollo

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.061357590 AU
orbital period P: 1.093454704 yr
(= 399.3843308 d)
eccentricity e: 0.270037573
perihelion distance q: 0.774751163 AU
aphelion distance Q: 1.347964018 AU
inclination i: 21.8988465°
argument of perihelion ω: 329.292126°
ascending node Ω: 202.8691675°
mean anomaly M: 58.209212°
perihelion passage TP: 2014 Mar 19.42264
Epoch: 2014 May 23
data arc: 1954-2014 (705 obs.)
Earth MOID: 0.197227 AU
Jupiter Tisserand invariant TJ: 5.71

orbital data, secondary:
binary dynamical type:A [P07f]
semimajor axis as: 1.6 km [*E]
separation/primary radius as/rp:3.3 [*E]
separation/Hill radius as/rH:0.028 [*E]
orbital period Ps: 0.6833 ± 0.0008 d [P06b]
eccentricity es: ?
normalized ang. mom. αL: 1.14 [P07f]

other data, system (combined):
absolute mag. H: 17.6 [MPC]
17.43 [JPL]
slope parameter G: (0.15) [*A]
effective diameter dE: 1 km [*E]
geometric albedo: 0.16 [P06b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 58 km [*E]

other data, primary:
diameter dp: 0.96 km [*E]
rotation period RPp: 2.4 ± 0.000 h [P06b]
amplitude in mag., rotational ΔM: 0.08 [H03a]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 0.2 km [*E]
diameter ratio ds/dp: 0.28 ± 0.02 [P06b]
component mag. difference ΔM: 2.8 ± 0.2 [*D]
rotation period RPs: ?

-- (88710) 2001 SL9 --discovery and notes:

Primary discovered 2001 Sep 18 from Palomar Observatory, California, USA by NEAT. Linked to prediscovery observations from 1954 Nov 27. Permanent number assigned 2004 Aug 30.

Companion discovered 2001 Oct 02 by P. Pravec, P. Kusnirak, and B. Warner using lightcurve observations from Ondrejov Observatory, Czech Republic; Palmer Divide Observatory, Colorado Springs, Colorado, USA. Announced 2001 Nov 03 [P01a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2001-2005, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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