Asteroids with Satellites Database--Johnston's Archive

2018 EB

compiled by Wm. Robert Johnston
last updated 27 May 2019

--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: 1.01698822 AU
orbital period P: 1.02559025 yr
(= 374.6039 d)
eccentricity e: 0.01203345
perihelion distance q: 1.00475034 AU
aphelion distance Q: 1.0292261 AU
inclination i: 29.438138°
argument of perihelion ω: 128.3746°
ascending node Ω: 194.589538°
mean anomaly M: 221.1701°
perihelion passage TP: 2018 Aug 14.4617
Epoch: 2018 Mar 23
data arc: 122 days (184 obs.)
Earth MOID: 0.00934437 AU
Jupiter Tisserand invariant TJ: 5.886


orbital data, secondary:
semimajor axis as: ?
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 21.7 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 0.24 km [B18a]
geometric albedo: 0.07 [B18a]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 19 km [*E]

other data, primary:
diameter dp: 0.24 km [B18a]
rotation period RPp: 1.2 h [B18l]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.04 km [B18l]
diameter ratio ds/dp: 0.167 [*D]
component mag. difference ΔM: 3.9 [*D]
rotation period RPs: ?

-- 2018 EB --discovery and notes:

Primary discovered 2018 Mar 01 from WISE by WISE.

Companion discovered 2018 Apr using radar observations from Goldstone, California, USA. Announced 2018 Apr.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2018, 2019 by Wm. Robert Johnston.
Last modified 27 May 2019.
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