Asteroids with Satellites Database--Johnston's Archive

(348400) 2005 JF21

compiled by Wm. Robert Johnston
last updated 19 February 2017

--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, Amor (PHA)


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.2230135522 AU
orbital period P: 3.314462925 yr
(= 1210.6304476 d)
eccentricity e: 0.53621043
perihelion distance q: 1.031010499 AU
aphelion distance Q: 3.415016605 AU
inclination i: 10.8710401°
argument of perihelion ω: 205.994114°
ascending node Ω: 132.3118611°
mean anomaly M: 281.3144168°
perihelion passage TP: 2015 Aug 30.6087856
Epoch: 2014 Dec 09
data arc: 2002-2015 (846 obs.)
Earth MOID: 0.0455623 AU
Jupiter Tisserand invariant TJ: 3.424


orbital data, secondary:
semimajor axis as: 0.9 km [*E]
separation/primary radius as/rp:3.0 [*E]
separation/Hill radius as/rH:0.019 [*E]
orbital period Ps: 0.614 d [W17a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 17.1 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 0.6 km [R###]
geometric albedo: 0.59 [*D]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 48 km [*E]

other data, primary:
diameter dp: 0.6 km [*E]
rotation period RPp: 2.4144 h [W17a]
amplitude in mag., rotational ΔM: 0.06 [W17a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.11 km [*D]
diameter ratio ds/dp: 0.18 [W17a]
component mag. difference ΔM: ?
rotation period RPs: ?

-- (348400) 2005 JF21 --discovery and notes:

Primary discovered 2005 May 04 from Kitt Peak Observatory, Arizona, USA by Spacewatch Program. Alternate designation(s): 2005 JU67. Linked to prediscovery observations from 2002 Nov 19. Permanent number assigned 2012 Dec 28.

Companion discovered 2015 Aug using radar observations from Goldstone, California, USA. Announced 2015 Aug.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2015, 2017 by Wm. Robert Johnston.
Last modified 19 February 2017.
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