74 Galatea

74 Galatea
Discovery
Discovered by	Ernst Wilhelm Tempel
Discovery date	August 29, 1862
Designations
MPC designation	(74) Galatea
Pronunciation	/ɡæləˈtiːə/[1]
Minor planet category	Main belt
Adjectives	Galatean
Orbital characteristics[2]
	Epoch December 31, 2006 (JD 2454100.5)
Aphelion	515.376 Gm (3.445 AU)
Perihelion	315.937 Gm (2.112 AU)
Semi-major axis	415.657 Gm (2.778 AU)
Eccentricity	0.240
Orbital period	1691.658 d (4.63 a)
Mean anomaly	36.838°
Inclination	4.075°
Longitude of ascending node	197.313°
Argument of perihelion	174.519°
Physical characteristics
Dimensions	120.67 ± 7.15 km[3]
Mass	(6.13 ± 5.36) × 1018 kg[3]
Mean density	6.66 ± 5.94[3] g/cm3
Rotation period	17.270[4] h
Geometric albedo	0.043 [5]
Spectral type	C[6]
Absolute magnitude (H)	8.66

Galatea (minor planet designation: 74 Galatea) is a large C-type main-belt asteroid. Its carbonaceous surface is very dark in color with an albedo of just 0.034.[7] Galatea was found by the prolific comet discoverer Ernst Tempel on August 29, 1862, in Marseilles, France. It was his third asteroid discovery. It is named after one of the two Galateas in Greek mythology. A stellar occultation by Galatea was observed on September 8, 1987. The name Galatea has also been given to one of Neptune's satellites.

Photometric observations of this asteroid made during 2008 at the Organ Mesa Observatory in Las Cruces, New Mexico gave a light curve with a period of 17.270 ± 0.002 hours and a brightness variation of 0.08 ± 0.01 in magnitude. The curve displays four minima and four maxima.[4] The spectra of the asteroid does not display evidence of aqueous alteration.[7]

References

Noah Webster (1884) A Practical Dictionary of the English Language
Yeomans, Donald K., "74 Galatea", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 30 March 2013.
Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
Pilcher, Frederick (September 2008), "Period Determinations for 26 Proserpina, 34 Circe 74 Galatea, 143 Adria, 272 Antonia, 419 Aurelia, and 557 Violetta", The Minor Planet Bulletin, 35 (3): 135–138, Bibcode:2008MPBu...35..135P.
Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
- JPL Small-Body Database Browser
Fornasier, S.; et al. (February 1999), "Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites", Astronomy and Astrophysics Supplement, 135: 65−73, Bibcode:1999A&AS..135...65F, doi:10.1051/aas:1999161.

External links

74 Galatea at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
74 Galatea at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[1] Noah Webster (1884) A Practical Dictionary of the English Language

[JPL-2] Yeomans, Donald K., "74 Galatea", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 30 March 2013.

[Carry2012-3] Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.

[Pilcher2008-4] Pilcher, Frederick (September 2008), "Period Determinations for 26 Proserpina, 34 Circe 74 Galatea, 143 Adria, 272 Antonia, 419 Aurelia, and 557 Violetta", The Minor Planet Bulletin, 35 (3): 135–138, Bibcode:2008MPBu...35..135P.

[5] Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine

[6] JPL Small-Body Database Browser

[7] JPL Small-Body Database Browser

[Fornasier1999-7] Fornasier, S.; et al. (February 1999), "Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites", Astronomy and Astrophysics Supplement, 135: 65−73, Bibcode:1999A&AS..135...65F, doi:10.1051/aas:1999161.