280 Philia
Orbital diagram
Discovery
Discovered byJohann Palisa
Discovery date29 October 1888
Designations
(280) Philia
Pronunciation/ˈfɪliə/
Named after
Philia (nymph)
A888 UB
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc126.17 yr (46,083 d)
Aphelion3.26133 AU (487.888 Gm)
Perihelion2.62787 AU (393.124 Gm)
2.94460 AU (440.506 Gm)
Eccentricity0.10756
5.05 yr (1,845.6 d)
52.7987°
0° 11m 42.212s / day
Inclination7.44582°
9.91179°
90.0510°
Physical characteristics
Dimensions45.69±2.0 km
70.26 h (2.928 d)
0.0444±0.004
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

    1. "280 Philia". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
    2. Lewis, James R. (2003). The Encyclopedia of Heavenly Influences. p. 521. ISBN 9781578591442. Retrieved 6 April 2015.
    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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