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Asteroids with Satellites Database--Johnston's Archive

(153958) 2002 AM31

compiled by Wm. Robert Johnston
last updated20 September 2014

--Orbital and physical data--

(Seethis page for definitions of quantities; source codes in brackets, seethis 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 axisa:	1.703044974 AU
orbital periodP:	2.222528700 yr (= 811.7786077 d)
eccentricitye:	0.451675264
perihelion distanceq:	0.933821686 AU
aphelion distanceQ:	2.472268263 AU
inclinationi:	4.6447832°
argument of perihelionω:	197.8310840°
ascending nodeΩ:	144.411981°
mean anomalyM:	282.0228455°
perihelion passageT_P:	2014 Nov 14.833849
Epoch:	2014 May 23
data arc:	1983-2014(629 obs.)
Earth MOID:	0.0320737 AU
Jupiter Tisserand invariantT_J:	4.073

orbital data, secondary:

semimajor axisa_s:	1.5 km[T13a]
separation/primary radiusa_s/r_p:	6.7 [*E]
separation/Hill radiusa_s/r_H:	0.037 [*E]
orbital periodP_s:	1.096d [T13a]
eccentricitye_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 parameterG:	(0.15) [*A]
effective diameterd_E:	0.46 km [*D]
geometric albedo:	(0.16) [*A]
color indexU-B:	?
color indexB-V:	0.217[D12a]
color indexV-R:	0.066 ± 0.01 [D12a]
color indexB-R:	0.283 [D12a]
color indexV-I:	0.067 [D12a]
taxonomic type:	?
massm:	?
densityρ:	>3 g/cm³[T13a]
Hill radiusr_H:	40 km [*E]

other data, primary:

diameterd_p:	0.45± 0.05 km [T13a]
rotation periodRP_p:	2.817h [W14c]
amplitude in mag., rotationalΔM:	0.07± 0.01 [W12d]
pole directionΒ, λ:	?,?

other data, secondary:

diameterd_s:	0.11km [*D]
diameter ratiod_s/d_p:	0.25 [T13a]
component mag. differenceΔM:	3.0 [*D]
rotation periodRP_s:	?

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

Primary discovered2002 Jan 14from Socorro, New Mexico, USAby LINEAR.Linked to prediscovery observations from 1983 May 07.Permanent number assigned 2007 Apr 02.

Companion discovered2012 Jul 12usingradar observations.Announced2012 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 AbstractsPhysical Characterization of Binary Near-Earth Asteroid (153958) 2002 AM31
Taylor, Emma, Cline, J. D., & Castelaz, M. W. 2013, American Astronomical Society Meeting AbstractsObservations of Near Earth Object 2002 AM31
Barker, E. S., Ries, J. G., Shelus, P. J., & Varadi, F. 2003, Bulletin of the American Astronomical SocietyPhotometry of Selected PHAs and NEAs at McDonald Observatory

©2012-2013, 2014by Wm. Robert Johnston.
Last modified20 September 2014.
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