Asteroids with Satellites Database--Johnston's Archive

(283) Emma and S/2003 (283) 1

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: main belt asteroid


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 3.047100676 AU
orbital period P: 5.319103092 yr
(= 1942.802404 d)
eccentricity e: 0.148445205
perihelion distance q: 2.59477319 AU
aphelion distance Q: 3.499428161 AU
inclination i: 7.9935225°
argument of perihelion ω: 53.617046°
ascending node Ω: 304.371545°
mean anomaly M: 338.862139°
perihelion passage TP: 2014 Sep 14.0741
Epoch: 2014 May 23
data arc: 1894-2012 (1380 obs.)
Earth MOID: 1.59864 AU
Jupiter Tisserand invariant TJ: 3.206


orbital data, secondary:
binary dynamical type:L [P07f]
semimajor axis as: 581 ± 3.6 km [M08c]
separation/primary radius as/rp:8.6 [*D]
separation/Hill radius as/rH:0.024 [*D]
orbital period Ps: 3.353 ± 0.00093 d [M08c]
eccentricity es: 0.12 ± 0.01 [M08c]
inclination is:0 ° [M05d]
normalized ang. mom. αL: 0.63 [P07f]

other data, system (combined):
absolute mag. H: 8.72 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 134.7 ± 2.35 km [M11b]
geometric albedo: 0.032 ± 0.004 [M11b]
color index U-B: 0.274 [T95a]
color index B-V: 0.628 [T95a]
taxonomic type: X (Tholen) [JPL]
mass m: 1.38x1018 ± 3x1016 kg [M08c]
density ρ: 0.7 ± 0.2 g/cm3[M08c]
Hill radius rH: 24000 km [*D]

other data, primary:
diameter dp: 134.7 ± 2.35 km [M11b]
rotation period RPp: 6.888 ± 0.007 h [S78a]
amplitude in mag., rotational ΔM: 0.31 [H03a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 9 ± 5 km [M08c]
diameter ratio ds/dp: 0.067 ± 0.037 [*D]
component mag. difference ΔM: 5.9 [* D]
rotation period RPs: ?

-- (283) Emma and S/2003 (283) 1 --discovery and notes:

Primary discovered 1889 Feb 08 from Nice, France by A. Charlois. Alternate designation(s): 1980 FJ12. Permanent number assigned 1889.

Named - for unknown namesake.

Companion discovered 2003 Jul 14 by W. J. Merline, C. Dumas, N. Siegler, L. M. Close, C. R. Chapman, P. M. Tamblyn, D. Terrell, A. Conrad, F. Menard, and G. Duvert using adaptive optics telescope observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA. Announced 2003 Jul 27 [M03f]. Provisional designation S/2003 (283) 1.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2003-2010, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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