Asteroids with Satellites Database--Johnston's Archive

2018 TF3

compiled by Wm. Robert Johnston
last updated 30 December 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: 2.1359 AU
orbital period P: 3.1216 yr
(= 1140.19 d)
eccentricity e: 0.71393
perihelion distance q: 0.611033 AU
aphelion distance Q: 3.6608 AU
inclination i: 6.8924°
argument of perihelion ω: 75.6421°
ascending node Ω: 52.4167°
mean anomaly M: 40.153°
perihelion passage TP: 2018 Dec 20.8291
Epoch: 2019 Apr 27
data arc: 2018 Oct 6-31 (171 obs.)
Earth MOID: 0.0199328 AU
Jupiter Tisserand invariant TJ: 3.327

orbital data, secondary:
semimajor axis as: 0.35 km [*E]
separation/primary radius as/rp:2.6 [*E]
separation/Hill radius as/rH:0.008 [*E]
orbital period Ps: 0.438 ± 0.0002 d [P18c]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 20.41 ± 0.36 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 0.28 km [*E]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 45 km [*E]

other data, primary:
diameter dp: 0.27 km [*E]
rotation period RPp: 2.4398 ± 0.0003 h [P18c]
amplitude in mag., rotational ΔM: 0.18 [P18c]
amplitude in mag., mutual events ΔM:0.09 ±0.03 [P18c]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 0.06 km [*E]
axial ratios a/b, b/c:1.5;? [P18c]
diameter ratio ds/dp: 0.23 ± 0.02 [P18c]
component mag. difference ΔM: 3.2 ± 0.2 [*D]
rotation period RPs: 2.3498 ± 0.0003 h [P18c]

-- 2018 TF3 --discovery and notes:

Primary discovered 2018 Oct 06 from Catalina Station, Arizona, USA by Catalina Sky Survey.

Companion discovered 2018 Oct 15 by P. Pravec, P. Kusnirak, K. Hornoch, H. Kucakova, P. Fatka using lightcurve observations from European Southern Observatory, La Silla. Announced 2018 Oct 26 [P18c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2018 by Wm. Robert Johnston.
Last modified 30 December 2018.
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