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(163693) Atira Asteroids with Satellites Database--Johnston's Archive

(163693) Atira

compiled by Wm. Robert Johnston
last updated 19 February 2017

--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, Atira
orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 0.7410827428 AU
orbital period P: 0.637969697 yr
(= 233.0228326 d)
eccentricity e: 0.32216064
perihelion distance q: 0.502335056 AU
aphelion distance Q: 0.97983043 AU
inclination i: 25.617734°
argument of perihelion ω: 252.931962°
ascending node Ω: 103.907079°
mean anomaly M: 132.78882°
perihelion passage T_P: 2016 Nov 22.047703
Epoch: 2017 Feb 16
data arc: 2003-2015 (376 obs.)
Earth MOID: 0.206966 AU
Jupiter Tisserand invariant T_J: 7.666

orbital data, secondary:

semimajor axis a_s: 6 km (separation) [R17a]
separation/primary radius a_s/r_p: 2.5 [*D]
separation/Hill radius a_s/r_H: 0.032 [*D]
orbital period P_s: 0.646 d [R17a]
eccentricity e_s: ?
normalized ang. mom. α_L: ?

other data, system (combined):

absolute mag. H: 16.3 [MPC]
slope parameter G: (0.15) [*A]
effective diameter d_E: 4.9 ± 0.5 km [*D]
geometric albedo: 0.022 [*D]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm³) [*A]
Hill radius r_H: 190 km [*E]
other data, primary:

diameter d_p: 4.8 ± 0.5 km [R17a]
rotation period RP_p: 2.9745 h [JPL]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:

diameter d_s: 1 ± 0.3 km [R17a]
diameter ratio d_s/d_p: 0.21 ± 0.07 [*D]
component mag. difference ΔM: 3.4 ± 0.7 [*D]
rotation period RP_s: ?

-- (163693) Atira --discovery and notes:

Primary discovered 2003 Feb 11 from Socorro, New Mexico, USA by LINEAR Program. Alternate designation(s): 2003 CP20 . Permanent number assigned 2007 Sep 26.

Named 2008 Jan 22 for the mythological Pawnee goddess of Earth [MPC61768].

Companion discovered 2017 Jan 20 by E. G. Rivera-Valentin, P. A. Taylor, A. Virkki, and B. Aponte-Hernandez using radar observations from Arecibo Observatory, Puerto Rico. Announced 2017 Jan 28 [R17a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2017 by Wm. Robert Johnston.
Last modified 19 February 2017.
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