Asteroids with Satellites Database--Johnston's Archive

(1139) Atami

compiled by Wm. Robert Johnston
last updated 21 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: Mars crossing asteroid

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.947630389 AU
orbital period P: 2.718116179 yr
(= 992.7919342 d)
eccentricity e: 0.255501191
perihelion distance q: 1.45000850 AU
aphelion distance Q: 2.445252273 AU
inclination i: 13.0851898°
argument of perihelion ω: 206.632214°
ascending node Ω: 213.368752°
mean anomaly M: 35.578078°
perihelion passage TP: 2014 Feb 13.88436
Epoch: 2014 May 23
data arc: 1929-2014 (1166 obs.)
Earth MOID: 0.470437 AU
Jupiter Tisserand invariant TJ: 3.824

orbital data, secondary:
binary dynamical type:B [P07f]
semimajor axis as: >15 km [M06a]
separation/primary radius as/rp:5.0 [*D]
separation/Hill radius as/rH:0.019 [*E]
orbital period Ps: 1.144 d [M06a]
eccentricity es: ?
normalized ang. mom. αL: 1.38 [P07f]

other data, system (combined):
absolute mag. H: 12.51 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 7.81 km [*D]
geometric albedo: 0.28 [*E]
color index U-B: 0.497 [JPL]
color index B-V: 0.92 [JPL]
taxonomic type: S (SMASSII) [JPL]
S (Tholen) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 790 km [*E]

other data, primary:
diameter dp: 6 km [M06a]
rotation period RPp: 27.45 h [M06a]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 5 km [M06a]
diameter ratio ds/dp: 0.833 [*D]
component mag. difference ΔM: 0.4 [* D]
rotation period RPs: 27.45 h [M06a]

-- (1139) Atami --discovery and notes:

Primary discovered 1929 Dec 01 from Tokyo, Japan by O. Oikawa and K. Kubokawa. Alternate designation(s): 1929 XE . Permanent number assigned 1930.

Named - for a harbor near Tokyo, Honshu, Japan.

Companion discovered 2005 Aug 31 by F. Manzini, R. Behrend, A. Klotz, S. Ostro, L. Benner, J. Giorgini, M. Nolan A. Hine, J.-L. Margot, C. Magri, M. Shepard, R. Roy, F. Colas, P. Antonini, P. Paakkonen, L. Bernasconi, A. Leroy, A. Oksanen, R. Crippa, R. Poncy, S. Charbonnel, D. Starkey, J. Coloma, C. Cavadore, E. Barbotin, J.-M. Llapasset, G. Farroni, and R. Koff using lightcurve observations from Sozzago, Italy; Geneva Observatory; Telescope a Action Rapide pour les Objets Transitoires, Haute-Provence Observatory, France; Jet Propulsion Laboratory; Arecibo Observatory; Cornell University; University of Maine, Farmington; Bloomsburg University of Pennsylvania, Pennsylvania, USA. Announced 2005 Sep 01 [M06a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2005-2009, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.