632 Pyrrha

Modelled shape of Pyrrha from its lightcurve

Discovery
Discovered by| August Kopff
Discovery site| Heidelberg
Discovery date| 5 April 1907
Designations

MPC designation

| (632) Pyrrha
Pronunciation| /ˈpɪrə/,[1]

Alternative designations

| 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)

Semi-major axis

| 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°

|{{{apsis}}}|helion}}

| 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

1. ↑ Pyrrhic (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Pyrrhic (Subscription or UK public library membership required.)
2. ↑ "632 Pyrrha (1907 YX)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=632;cad=1.
3. ↑ 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
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 632 Pyrrha at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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