Asteroids with Satellites Database--Johnston's Archive

(3749) Balam, S/2002 (3749) 1, and third component

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: 2.236702937 AU
orbital period P: 3.345189033 yr
(= 1221.8302940 d)
eccentricity e: 0.109273190
perihelion distance q: 1.99229127 AU
aphelion distance Q: 2.481114602 AU
inclination i: 5.3823141°
argument of perihelion ω: 173.985299°
ascending node Ω: 295.740745°
mean anomaly M: 260.393938°
perihelion passage TP: 2015 Apr 26.0602
Epoch: 2014 May 23
data arc: 1954-2013 (1074 obs.)
Earth MOID: 1.00875 AU
Jupiter Tisserand invariant TJ: 3.624

orbital data, S/2002 (3749) 1:
binary dynamical type:W [P07f]
semimajor axis as: 289 ± 13 km [M08c]
separation/primary radius as/rp:150 [*D]
separation/Hill radius as/rH:0.220 [*D]
orbital period Ps: 61 ± 11 d [M08c]
eccentricity es: 0.9 [M08c]
normalized ang. mom. αL: 1.07 [M09a]

orbital data, third component:
semimajor axis as: 20 km [M08a]
separation/primary radius as/rp:10 [*D]
separation/Hill radius as/rH:0.015 [*D]
orbital period Ps: 1.391 ± 0.00004 d [P11b]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.1 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.66 ± 0.21 km [M11b]
geometric albedo: 0.355 ± 0.067 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: 5.1x1014 ± 2x1013 kg [M08c]
density ρ: 2.6 g/cm3[M08c]
Hill radius rH: 1300 km [*D]

other data, primary:
diameter dp: 3.95 km [*D]
axial ratios a/b, b/c:1.11, 1.2 [P14b]
rotation period RPp: 2.80483 ± 0.00002 h [M08a]
amplitude in mag., rotational ΔM: 0.13 [M08a]
pole direction Β, λ: ? , ?

other data, S/2002 (3749) 1:
diameter ds: 1.84 km [*D]
diameter ratio ds/dp: 0.466 [M08c]
component mag. difference ΔM: 3.3 [M02d]
rotation period RPs: ?

other data, third component:
diameter ds: 1.66 km [*D]
diameter ratio ds/dp: 0.42 ± 0.03 [P11b]
component mag. difference ΔM: 1.9 ± 0.2 [*D]
rotation period RPs: ?

-- (3749) Balam, S/2002 (3749) 1, and third component --discovery and notes:

Primary discovered 1982 Jan 24 from Anderson Mesa Station, Arizona, USA by E. Bowell. Alternate designation(s): 1982 BG1, 1954 XM, 1962 ED, 1974 YO. Linked to prediscovery observations from 1954 Dec 06. Permanent number assigned 1988 Feb 02.

Named 1988 May 31 for David D. Balam [MPC13178].

Second component discovered 2002 Feb 08 by W. J. Merline, L. M. Close, N. Siegler, C. Dumas, C. Chapman, F. Rigaut, F. Menard, W. M. Owen, and D. C. Slater using adaptive optics telescope observations from Gemini North Telescope, Mauna Kea, Hawaii, USA. Announced 2002 Feb 13 [M02d]. Provisional designation S/2002 (3749) 1.

Third component discovered 2007 Jul 15 by F. Marchis, J. Pollock, P. Pravec, M. Baek, J. Greene, L. Hutton, P. Descamps, D. E. Reichart, K. M. Ivarsen, J. A. Crain, M. C. Nysewander, A. P. Lacluyze, J. B. Haislip, and J. S. Harvey using lightcurve observations from Carl Sagan Center, SETI Institute; Appalachian State University, North Carolina, USA; Ondrejov Observatory, Czech Republic; Institut de Mecanique Celeste et de Calcul des Ephemerides; University of North Carolina at Chapel Hill, North Carolina, USA. Announced 2008 Mar 12 [M08a].

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© 2002-2009, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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