632 Pyrrha
Photometric observations of the minor planet in 2011 gave a rotation period of 4.1167±0.001 h with an amplitude of 0.40±0.04 in magnitude. This result rules out previous determinations of the period.[3]
Modelled shape of Pyrrha from its lightcurve | |
Discovery | |
---|---|
Discovered by | August Kopff |
Discovery site | Heidelberg |
Discovery date | 5 April 1907 |
Designations | |
(632) Pyrrha | |
Pronunciation | /ˈpɪrə/,[1] |
1907 YX | |
Orbital characteristics[2] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 109.03 yr (39823 d) |
Aphelion | 3.1695 AU (474.15 Gm) |
Perihelion | 2.1583 AU (322.88 Gm) |
2.6639 AU (398.51 Gm) | |
Eccentricity | 0.18979 |
4.35 yr (1588.1 d) | |
33.9510° | |
0° 13m 36.084s / day | |
Inclination | 2.2156° |
356.505° | |
252.767° | |
Physical characteristics | |
4.1167 h (0.17153 d) | |
11.4 | |
632 Pyrrha is a minor planet orbiting the Sun.
References
- "Pyrrhic". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
- "632 Pyrrha (1907 YX)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
- Pilcher, Frederick (July 2011), "Rotation Period Determinations for 28 Bellona, 81 Terpsichore, 126 Velleda 150 Nuwa, 161 Athor, 419 Aurelia, and 632 Pyrrha", The Minor Planet Bulletin, 38 (3): 156–158, Bibcode:2011MPBu...38..156P.
External links
- 632 Pyrrha at AstDyS-2, Asteroids—Dynamic Site
- 632 Pyrrha at the JPL Small-Body Database
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