Astronomy:632 Pyrrha
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_Pyrrha.png) 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) |
| |{{{apsis}}}|helion}} | 3.1695 astronomical unit|AU (474.15 Gm) |
| |{{{apsis}}}|helion}} | 2.1583 AU (322.88 Gm) |
| 2.6639 AU (398.51 Gm) | |
| Eccentricity | 0.18979 |
| Orbital period | 4.35 yr (1588.1 d) |
| Mean anomaly | 33.9510° |
| Mean motion | 0° 13m 36.084s / day |
| Inclination | 2.2156° |
| Longitude of ascending node | 356.505° |
| 252.767° | |
| Physical characteristics | |
| Rotation period | 4.1167 h (0.17153 d) |
| Absolute magnitude (H) | 11.4 |
632 Pyrrha is a minor planet orbiting the Sun.
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]
References
- ↑ Pyrrhic (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Pyrrhic (Subscription or UK public library membership required.)
- ↑ "632 Pyrrha (1907 YX)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=632;cad=1.
- ↑ 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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