Asteroids with Satellites Database--Johnston's Archive

2017 YE5

compiled by Wm. Robert Johnston
last updated 23 September 2018

--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: 2.820305 AU
orbital period P: 4.736354 yr
(= 1729.985 d)
eccentricity e: 0.7102765
perihelion distance q: 0.81710844 AU
aphelion distance Q: 4.823501 AU
inclination i: 6.209782°
argument of perihelion ω: 110.768344°
ascending node Ω: 103.9603°
mean anomaly M: 348.99482°
perihelion passage TP: 2018 May 14.885575
Epoch: 2018 Mar 23
data arc: 220 days (306 obs.)
Earth MOID: 0.0205924 AU
Jupiter Tisserand invariant TJ: 2.875


orbital data, secondary:
semimajor axis as: 2.4 km [*E]
separation/primary radius as/rp:5.3 [*E]
separation/Hill radius as/rH:0.033 [*E]
orbital period Ps: 0.92 ± 0.08 d [**]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 19.3 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 1.3 km [*D]
geometric albedo: 0.02 [*D]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 72 km [*E]

other data, primary:
diameter dp: 0.9 km [**]
rotation period RPp: 20.6 ± 0.1 h [W18a]
amplitude in mag., rotational ΔM: 0.33 [W18a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.9 km [**]
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
rotation period RPs: ?

-- 2017 YE5 --discovery and notes:

Primary discovered 2017 Dec 12 .

Companion discovered 2018 Jul using radar observations. Announced 2018 Jul.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2018 by Wm. Robert Johnston.
Last modified 23 September 2018.
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