Asteroids with Satellites Database--Johnston's Archive

2018 EB

compiled by Wm. Robert Johnston
last updated 9 October 2021

--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: 1.016623328 AU
orbital period P: 1.025057692 yr
(= 374.4023219 d)
eccentricity e: 0.012192593
perihelion distance q: 1.004228054 AU
aphelion distance Q: 1.029018602 AU
inclination i: 29.4360571°
argument of perihelion ω: 126.864886°
ascending node Ω: 194.55352591°
mean anomaly M: 293.139232°
perihelion passage TP: 2021 Sep 08.535630
Epoch: 2021 Jul 01
data arc: 2018-2020 (272 obs.)
Earth MOID: 0.009693 AU
Jupiter Tisserand invariant TJ: 5.888

orbital data, secondary:
semimajor axis as: 0.3 km (separation) [B18l]
separation/primary radius as/rp:2.5 [*E]
separation/Hill radius as/rH:0.016 [*E]
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 21.9 [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: 3.16 h [W21b]
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: 3.89 [*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 Observatory, California, USA. Announced 2018 Apr.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2018-2019, 2021 by Wm. Robert Johnston.
Last modified 9 October 2021.
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