Asteroids with Satellites Database--Johnston's Archive

(1862) Apollo

compiled by Wm. Robert Johnston
last updated 16 November 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 (PHA)


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.47004342241 AU
orbital period P: 1.7823592519 yr
(= 651.01901205 d)
eccentricity e: 0.559959378
perihelion distance q: 0.646878822 AU
aphelion distance Q: 2.2932080224 AU
inclination i: 6.3531104°
argument of perihelion ω: 285.832667°
ascending node Ω: 35.745397°
mean anomaly M: 279.1889451°
perihelion passage TP: 2009 Apr 12.1375921
Epoch: 2014 Dec 09
data arc: 1930-2014 (1236 obs.)
Earth MOID: 0.0256879 AU
Jupiter Tisserand invariant TJ: 4.415


orbital data, secondary:
semimajor axis as: 3.75 ± 0.25 km [F14a]
separation/primary radius as/rp:2.6 [*D]
separation/Hill radius as/rH:0.047 [*D]
orbital period Ps: 1.14 ± 0.01 d [F14a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 16.25 [MPC]
slope parameter G: 0.09 [JPL]
effective diameter dE: 1.55 ± 0.07 km [*D]
geometric albedo: 0.2 ± 0.02 [R13a]
color index U-B: 0.481 [JPL]
color index B-V: 0.819 [JPL]
taxonomic type: Q (SMASSII) [JPL]
Q (Tholen) [JPL]
mass m: 3.35x1012 ± 5.5x1011 kg [F14a]
density ρ: 2.05 ± 0.35 g/cm3[F14a]
Hill radius rH: 80 km [*D]

other data, primary:
diameter dp: 1.55 ± 0.07 km [R13a]
dimensions :1.8 x 1.5 x 1.3km [F14a]
axial ratios a/b, b/c:1.2, 1.15 [F14a]
volume :1.6[F14a]
rotation period RPp: 3.065 ± 0 h [K07a]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: 71 ± 11° , -72 ± 11° [F14a]


other data, secondary:
diameter ds: 0.08 ± 0.06 km [O05a]
dimensions :0.19 x ? x ?km [F14a]
diameter ratio ds/dp: 0.052 ± 0.039 [*D]
component mag. difference ΔM: 6.4 [*D]
rotation period RPs: ?

-- (1862) Apollo --discovery and notes:

Primary discovered 1932 Apr 24 from Heidelberg, Germany by K. Reinmuth. Alternate designation(s): 1932 HA . Linked to prediscovery observations from 1930 Dec 13. Permanent number assigned 1974.

Named 1936 for the mythological Greek god [MPC3758].

Companion discovered 2005 Oct 29 by S. J. Ostro, L. A. M. Benner, J. D. Giorgini, M. C. Nolan, A. A. Hine, E. S. Howell, J. L. Margot, C. Magri, and M. K. Shepard using radar observations from Arecibo Observatory, Puerto Rico. Announced 2005 Nov 04 [O05a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2005-2007, 2014 by Wm. Robert Johnston.
Last modified 16 November 2014.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.