280 Philia

280 Philia
	Orbital diagram
Discovery
Discovered by	Johann Palisa
Discovery date	29 October 1888
Designations
MPC designation	(280) Philia
Pronunciation	⫽ˈfɪliə⫽
Named after	Philia (nymph)
Alternative designations	A888 UB
Minor planet category	Main belt
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	126.17 yr (46,083 d)
Aphelion	3.26133 AU (487.888 Gm)
Perihelion	2.62787 AU (393.124 Gm)
Semi-major axis	2.94460 AU (440.506 Gm)
Eccentricity	0.10756
Orbital period (sidereal)	5.05 yr (1,845.6 d)
Mean anomaly	52.7987°
Mean motion	0° 11m 42.212s / day
Inclination	7.44582°
Longitude of ascending node	9.91179°
Argument of perihelion	90.0510°
Physical characteristics
Dimensions	45.69±2.0 km
Synodic rotation period	70.26 h (2.928 d)
Geometric albedo	0.0444±0.004
Absolute magnitude (H)	10.9

Philia (minor planet designation: 280 Philia) is a fairly large Main belt asteroid.^[2] It was discovered by Johann Palisa on 29 October 1888 at the Vienna Observatory.

Sparse data collected during a 1987 study indicated this asteroid has a rotation period of approximately 64 hours, which is much longer than can be continually observed from one site. During 2010−2011, an international collaboration to study the asteroid collected 9,037 photometric data points over 38 sessions. The resulting light curve analysis displays a rotation period of 70.26±0.03 h with a brightness variation of 0.15±0.02 in magnitude.^[3]

References[edit]

^ "280 Philia". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
^ Lewis, James R. (2003). The Encyclopedia of Heavenly Influences. p. 521. ISBN 9781578591442. Retrieved 6 April 2015.
^ Pilcher, Frederick; et al. (July 2011), "Rotation Period Determination for 280 Philia - A Triumph of Global Collaboration", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, vol. 38, no. 3, pp. 127–128, Bibcode:2011MPBu...38..127P.

External links[edit]

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

This article about an asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[jpldata-1] "280 Philia". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.

[Lewis2003-2] Lewis, James R. (2003). The Encyclopedia of Heavenly Influences. p. 521. ISBN 9781578591442. Retrieved 6 April 2015.

[Pilcher_et_al_2011-3] Pilcher, Frederick; et al. (July 2011), "Rotation Period Determination for 280 Philia - A Triumph of Global Collaboration", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, vol. 38, no. 3, pp. 127–128, Bibcode:2011MPBu...38..127P.

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