(153958) 2002 AM31

Asteroids with Satellites Database--Johnston's Archive

(153958) 2002 AM31

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: 1.703044974 AU
orbital period P: 2.222528700 yr
(= 811.7786077 d)
eccentricity e: 0.451675264
perihelion distance q: 0.933821686 AU
aphelion distance Q: 2.472268263 AU
inclination i: 4.6447832°
argument of perihelion ω: 197.8310840°
ascending node Ω: 144.411981°
mean anomaly M: 282.0228455°
perihelion passage T_P: 2014 Nov 14.833849
Epoch: 2014 May 23
data arc: 1983-2014 (629 obs.)
Earth MOID: 0.0320737 AU
Jupiter Tisserand invariant T_J: 4.073

orbital data, secondary:

semimajor axis a_s: 1.5 km [T13a]
separation/primary radius a_s/r_p: 6.7 [*E]
separation/Hill radius a_s/r_H: 0.037 [*E]
orbital period P_s: 1.096 d [T13a]
eccentricity e_s: 0.45 [T13a]
normalized ang. mom. α_L: ?

other data, system (combined):

absolute mag. H: 18.3 [MPC]
18.50 ± 0.02 [D12a]
slope parameter G: (0.15) [*A]
effective diameter d_E: 0.46 km [*D]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: 0.217 [D12a]
color index V-R: 0.066 ± 0.01 [D12a]
color index B-R: 0.283 [D12a]
color index V-I: 0.067 [D12a]
taxonomic type: ?
mass m: ?
density ρ: >3 g/cm³[T13a]
Hill radius r_H: 40 km [*E]
other data, primary:

diameter d_p: 0.45 ± 0.05 km [T13a]
rotation period RP_p: 2.817 h [W14c]
amplitude in mag., rotational ΔM: 0.07 ± 0.01 [W12d]
pole direction Β, λ: ? , ?

other data, secondary:

diameter d_s: 0.11 km [*D]
diameter ratio d_s/d_p: 0.25 [T13a]
component mag. difference ΔM: 3.0 [*D]
rotation period RP_s: ?

-- (153958) 2002 AM31 --discovery and notes:

Primary discovered 2002 Jan 14 from Socorro, New Mexico, USA by LINEAR. Linked to prediscovery observations from 1983 May 07. Permanent number assigned 2007 Apr 02.

Companion discovered 2012 Jul 12 using radar observations. Announced 2012 Jul .

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

Taylor, Patrick A., Howell, E. S., Nolan, M. C., Springmann, A., Brozovic, M., Benner, L. M., Jao, J. S., Giorgini, J. D., Margot, J., Fang, J., Becker, T. M., Fernandez, Y. R., Vervack, R. J., Pravec, P., Kusnirak, P., Franco, L., Ferrero, A., Galad, A., Pray, D. P., Warner, B. D., & Hicks, M. D. 2013, AAS/Division for Planetary Sciences Meeting Abstracts Physical Characterization of Binary Near-Earth Asteroid (153958) 2002 AM31
Taylor, Emma, Cline, J. D., & Castelaz, M. W. 2013, American Astronomical Society Meeting Abstracts Observations of Near Earth Object 2002 AM31
Barker, E. S., Ries, J. G., Shelus, P. J., & Varadi, F. 2003, Bulletin of the American Astronomical Society Photometry of Selected PHAs and NEAs at McDonald Observatory

© 2012-2013, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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