Asteroids with Satellites Database--Johnston's Archive

(164121) 2003 YT1

compiled by Wm. Robert Johnston
last updated 20 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: 1.109909552 AU
orbital period P: 1.169336714 yr
(= 427.1002347 d)
eccentricity e: 0.291915233
perihelion distance q: 0.785910047 AU
aphelion distance Q: 1.433909056 AU
inclination i: 44.061464°
argument of perihelion ω: 90.9713308°
ascending node Ω: 38.3445423°
mean anomaly M: 271.2306292°
perihelion passage TP: 2014 Sep 05.315053
Epoch: 2014 May 23
data arc: 1982-2011 (668 obs.)
Earth MOID: 0.00327393 AU
Jupiter Tisserand invariant TJ: 5.323


orbital data, secondary:
binary dynamical type:A [P07f]
semimajor axis as: 3.93 ± 0.8 km [F12a]
separation/primary radius as/rp:7.1 [*D]
separation/Hill radius as/rH:0.056 [*D]
orbital period Ps: 1.529 ± 0.075 d [B06c]
eccentricity es: 0.18 ± 0.015 [F12a]
normalized ang. mom. αL: 1.13 [P07f]

other data, system (combined):
absolute mag. H: 16.2 [MPC]
16.23 [JPL]
slope parameter G: (0.15) [*A]
effective diameter dE: 1.12 km [*D]
geometric albedo: 0.486 ± 0.04 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: 1.27x1012 ± 3.9x1011 kg [B06c]
density ρ: 2.01 ± 0.7 g/cm3[B06c]
Hill radius rH: 70 km [*D]

other data, primary:
diameter dp: 1.1 ± 0.2 km [N04a]
volume :0.63± 0.1[B06c]
rotation period RPp: 2.343 h [P06b]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.21 ± 0.06 km [N04a]
diameter ratio ds/dp: 0.191 ± 0.065 [*D]
component mag. difference ΔM: 0.18 [P03c]
rotation period RPs: ?

-- (164121) 2003 YT1 --discovery and notes:

Primary discovered 2003 Dec 18 from Catalina Station, Arizona, USA by Catalina Sky Survey. Linked to prediscovery observations from 1982 Nov 19. Permanent number assigned 2007 Sep 26.

Companion discovered 2004 May 06 using radar and lightcurve observations. Announced 2004 May 06.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2004-2007, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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