Asteroids with Satellites Database--Johnston's Archive

(1862) Apollo

compiled by Wm. Robert Johnston
last updated 21 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 (PHA)


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.470179420 AU
orbital period P: 1.782640261 yr
(= 651.1093555 d)
eccentricity e: 0.559855754
perihelion distance q: 0.647091013 AU
aphelion distance Q: 2.293267828 AU
inclination i: 6.3525671°
argument of perihelion ω: 285.813773°
ascending node Ω: 35.755866°
mean anomaly M: 139.8657350°
perihelion passage TP: 2007 Jul 01.033642
Epoch: 2014 May 23
data arc: 1930-2014 (1146 obs.)
Earth MOID: 0.0258672 AU
Jupiter Tisserand invariant TJ: 4.415


orbital data, secondary:
semimajor axis as: 3 km (separation) [O05a]
separation/primary radius as/rp:3.9 [*E]
separation/Hill radius as/rH:0.031 [*D]
orbital period Ps: 0.62 d [*E]
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: 5.68x1012 ± 1.43x1012 kg [R13a]
density ρ: 2.85 ± 0.58 g/cm3[R13a]
Hill radius rH: 95 km [*D]

other data, primary:
diameter dp: 1.55 ± 0.07 km [R13a]
axial ratios a/b, b/c:1.27, ? [O02a]
rotation period RPp: 3.065 ± 0.000 h [K07a]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.08 ± 0.06 km [O05a]
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 mytholgoical 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:

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--Links to ADS abstracts:


© 2005-2007, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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