3749 Balam
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Discovery
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| Discovered by | Edward L. G. Bowell |
| Discovery date | January 24, 1982 |
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Designations
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| Named after | David D. Balam |
| Alternate name(s) | 1954 XM; 1962 ED; 1974 YO; 1982 BG1 |
| Minor planet category |
Main belt |
| Epoch November 26, 2005 (JD 2453700.5) | |
| Aphelion | 371.292 Gm (2.482 AU) |
| Perihelion | 297.982 Gm (1.992 AU) |
| Semi-major axis | 334.637 Gm (2.237 AU) |
| Eccentricity | 0.110 |
| Orbital period | 1221.998 d (3.35 a) |
| Average orbital speed | 19.85 km/s |
| Mean anomaly | 67.047° |
| Inclination | 5.382° |
| Longitude of ascending node | 295.903° |
| Argument of perihelion | 173.884° |
| Satellites | 2 (5.2±1 km) (1.5 km) |
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Physical characteristics
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| Dimensions | 7.2 km[1] |
| Mass | 5.09±0.2×1014 kg[1][2] |
| Mean density | 2.61±0.45 g/cm³[1][2] |
| Rotation period | 2.80483 hr[3] |
| Albedo | 0.16 |
| Temperature | ~183 K |
| Spectral type | S[1] |
| Absolute magnitude (H) | 13.4[3] |
3749 Balam is an asteroid orbiting in the asteroid belt. It is named after the Canadian astronomer David D. Balam.
[edit] Satellite system
A satellite with a diameter of ~1.5 km, designated S/2002 (3749) 1, was discovered by William J. Merline, Laird M. Close, Nick Siegler, Christophe Dumas, Clark R. Chapman, François J. Rigaut, François Ménard, William M. Owen Jr., and David C. Slater from the Gemini North Telescope, Mauna Kea; this was announced on February 13, 2002.[4] It orbits 289±13 km away in 61±10 days, with an orbital eccentricity of ~0.9.[2]
Being such as small primary body in the inner main belt with a separation of over 100 primary radii, S/2002 (3749) 1 is the most loosely-bound binary known.[5] Balam has a hill sphere with a radius of about 1,500 km.[2]
In March 2008, Franck Marchis discovered a larger (~3 km) inner companion, making this a triple system.[6][7][8]
[edit] References
- ^ a b c d Jim Baer (12 December 2010). "Recent Asteroid Mass Determinations". Personal Website. http://home.earthlink.net/~jimbaer1/astmass.txt. Retrieved 2012-02-03.
- ^ a b c d Marchis, Franck; P. Descamps, J. Berthier, D. hestroffer, F. vachier, M. Baek, A. Harris, D. Nesvorny (2008). "Main Belt Binary Asteroidal Systems With Eccentric Mutual Orbits". Icarus 195 (1): 295–316. arXiv:0804.1385. Bibcode 2008Icar..195..295M. doi:10.1016/j.icarus.2007.12.010.
- ^ a b "JPL Small-Body Database Browser: 3749 Balam (1982 BG1)". Jet Propulsion Laboratory. 2011-12-29 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3749. Retrieved 2012-02-04.
- ^ "IAUC 7827: P/2001 WF_2; S/2002 (3749) 1". IAU Central Bureau for Astronomical Telegrams. 2002 February 13. http://www.cbat.eps.harvard.edu/iauc/07800/07827.html#Item2. Retrieved 2005-11-17.
- ^ Merline, W.J.; Siegler, N.; Dumas, C.; Chapman, C. R.; Rigaut, F.; Menard, F.; Owen, W. M.; Slater, D. C.; Durda, D. D. (2002). "Discovery of a Loosely-bound Companion to Main-belt Asteroid (3749) Balam". American Astronomical Society 34: 835. Bibcode 2002DPS....34.0201M.
- ^ "IAUC 8928: V2468 Cyg = N Cyg 2008; (3749)". IAU Central Bureau for Astronomical Telegrams. 2008 March 19. http://www.cbat.eps.harvard.edu/iauc/08900/08928.html#Item2. Retrieved 2012-02-04.
- ^ Franck Marchis (Principal Investigator, SETI Institute, UC Berkeley). "Franck Marchis Web Page". Department of Astronomy (University of California at Berkeley). http://astro.berkeley.edu/~fmarchis/. Retrieved 2009-10-27.
- ^ Wm. Robert Johnston (2009-01-13). "(3749) Balam, S/2002 (3749) 1, and third component". Johnston's Archive. http://www.johnstonsarchive.net/astro/astmoons/am-03749.html. Retrieved 2009-10-27.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
- IAUC 7827
- Franck Marchis entry for 3749 Balam
- Orbits of Binary Asteroids with Adaptive Optics (VLT images)
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