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

compiled by Wm. Robert Johnston
last updated 6 December 2009

Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):

orbital data, primary (osculating elements) [JPL]:
semimajor axis a: 2.2365639 AU
orbital period P: 3.3449 y (=1221.7 d)
eccentricity e: 0.1094344
perihelion distance q: 1.9918069 AU
aphelion distance Q: 2.48132093 AU
inclination i: 5.3829°
argument of perihelion omega: 173.81988°
ascending node OMEGA: 295.91108°
mean anomaly M: 37.6432°
perihelion passage TP: 2005-04-12.2519016
Epoch: 18 AUG 2005
data arc: 1954-2004 (333 obs.)

orbital data, secondary:
semimajor axis a: 310 ± 20 km [MAc]
semimajor axis/primary radius a/Rp: (89)
orbital period P: 110 ± 25 d [MAc]
eccentricity e: 0.15 ± 0.15 [MAc]

orbital data, third component:
semimajor axis a: ~20 km [I8928]
semimajor axis/primary radius a/Rp: (6)
orbital period P: 33.38 ± 0.02 h [C1297]
eccentricity e: ?

other data, primary:
diameter: 7 km [A3a]
absolute magnitude H: 13.4 [SBc]
rotation period: 2.80483 ± 0.00002 h [C1297]
amplitude delta M: 0.13; 0.15-0.43 [C1297]
color index B-V: ?
color index V-R: ?
color index R-I: ?
slope parameter G: (0.15) assumed
geometric albedo: (0.16) assumed
mass: (1.5 ± 0.6)x1014 kg [MAc]
density: 1.2 ± 0.5 g/cm3 [MAc]
type: S [A3a]

other data, secondary:
diameter: 1.5 km [A3a]
diameter ratio Ds/Dp: (0.22)
component magnitude difference: 3.3 [I7827]
rotation period: ?

other data, third component:
diameter: (~3 km)
diameter ratio Ds/Dp: 0.4 ± 0.1 [C1297]
component magnitude difference: (2.0)
rotation period: ?

--(3749) Balam--discovery and notes:

Primary discovered 24 January 1982 by E. Bowell from Anderson Mesa, Arizona, USA. Subsequently linked to observations from 1954. Also designated 1954 XM, 1962 ED, 1974 YO, and 1982 BG1.

Secondary discovered 8 February 2002 by W. J. Merline, L. M. Close, N. Siegler, C. Dumas, C. Chapman, F. Rigaut, F. Menard, W. M. Owen, and D. C. Slater from the Gemini North Telescope, Mauna Kea; announced 13 February 2002.

Third component discovered 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 based on lightcurve observations obtained 15 July to 19 October 2007; reported 12 March 2008.

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2002-2008, 2009 by Wm. Robert Johnston.
Last modified 6 December 2009.
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