174 Phaedra

174 Phaedra
	A three-dimensional model of 174 Phaedra based on its light curve.
Discovery
Discovered by	J. C. Watson
Discovery date	2 September 1877
Designations
MPC designation	(174) Phaedra
Pronunciation	/ˈfiːdrə/
Minor planet category	Main belt
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	138.61 yr (50629 d)
Aphelion	3.2658 AU (488.56 Gm)
Perihelion	2.4572 AU (367.59 Gm)
Semi-major axis	2.8615 AU (428.07 Gm)
Eccentricity	0.14128
Orbital period (sidereal)	4.84 yr (1768.0 d)
Mean anomaly	330.70°
Mean motion	0° 12m 13.032s / day
Inclination	12.124°
Longitude of ascending node	327.69°
Argument of perihelion	289.08°
Earth MOID	1.47439 AU (220.566 Gm)
Jupiter MOID	1.99981 AU (299.167 Gm)
TJupiter	3.254
Physical characteristics
Mean radius	34.62±2.2 km
Synodic rotation period	5.744 h (0.2393 d)
Geometric albedo	0.1495±0.021
Spectral type	S
Absolute magnitude (H)	8.48

Phaedra (minor planet designation: 174 Phaedra) is a sizable, rocky main belt asteroid that was discovered by Canadian-American astronomer James Craig Watson on September 2, 1877, and named after Phaedra, the tragic lovelorn queen in Greek mythology.

The asteroid is orbiting the Sun with a period of 4.84 years and an eccentricity of 0.14. Lightcurve data obtained from Phaedra indicates a rather irregular or elongated body. It has a cross-section size of ~35 km. Photometric observations of this asteroid at the Shadowbox Observatory in Carmel, Indiana, during 2009 gave a light curve with a period of 4.96 ± 0.01 hours. This is consistent with previous studies in 1977, 1988, and 2008.^[3] The asteroid's pole of rotation lies just 5–16° away from the plane of the ecliptic.^[4]

References[]

^ Noah Webster (1884) A Practical Dictionary of the English Language
^ Yeomans, Donald K., "174 Phaedra", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.
^ Ruthroff, John C. (July 2009), "Photometric Observations and Lightcurve Analysis of Asteroids 129 Antigone, 174 Phaedra, 232 Russia, 291 Alice, and 343 Ostara", The Minor Planet Bulletin, vol. 36, no. 3, pp. 121–122, Bibcode:2009MPBu...36..121R.
^ Marciniak, A.; et al. (May 2011), "Photometry and models of selected main belt asteroids. VIII. Low-pole asteroids", Astronomy & Astrophysics, 529: 14, Bibcode:2011A&A...529A.107M, doi:10.1051/0004-6361/201015365, A107

External links[]

174 Phaedra at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
174 Phaedra 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., "174 Phaedra", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.

[Ruthroff2009-3] Ruthroff, John C. (July 2009), "Photometric Observations and Lightcurve Analysis of Asteroids 129 Antigone, 174 Phaedra, 232 Russia, 291 Alice, and 343 Ostara", The Minor Planet Bulletin, vol. 36, no. 3, pp. 121–122, Bibcode:2009MPBu...36..121R.

[Marciniak2011-4] Marciniak, A.; et al. (May 2011), "Photometry and models of selected main belt asteroids. VIII. Low-pole asteroids", Astronomy & Astrophysics, 529: 14, Bibcode:2011A&A...529A.107M, doi:10.1051/0004-6361/201015365, A107

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