Categories
81 Terpsichore
Topic: Astronomy
From HandWiki - Reading time: 4 min
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Ernst Wilhelm Tempel |
| Discovery date | September 30, 1864 |
| Designations | |
| (81) Terpsichore | |
| Pronunciation | /tɜːrpˈsɪxərɛ/[1] |
| Named after | Terpsichore |
| Minor planet category | Main belt |
| Adjectives | Terpsichorean /tɜːrpsɪxəˈriːən/[1] |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| |{{{apsis}}}|helion}} | 516.955 million km (3.456 AU) |
| |{{{apsis}}}|helion}} | 337.132 million km (2.254 AU) |
| 427.044 million km (2.855 AU) | |
| Eccentricity | 0.211 |
| Orbital period | 1761.647 d (4.82 a) |
| Average Orbital speed | 17.43 km/s |
| Mean anomaly | 149.581° |
| Inclination | 7.809° |
| Longitude of ascending node | 1.497° |
| 50.234° | |
| Physical characteristics | |
| Dimensions | 121.77 ± 2.34 km[2] |
| Mass | (6.19 ± 5.31) × 1018 kg[2] |
| Mean density | 6.54 ± 5.62 g/cm3[2] |
| Rotation period | 10.943 hr |
| Geometric albedo | 0.051 [3] |
| C | |
| Absolute magnitude (H) | 8.48 |
81 Terpsichore is a large and very dark main-belt asteroid. It has most probably a very primitive carbonaceous composition. It was found by the prolific comet discoverer Ernst Tempel on September 30, 1864.[4] It is named after Terpsichore, the Muse of dance in Greek mythology.
This object is orbiting the Sun at a distance of 2.855 astronomical unit|AU with a moderate eccentricity of 0.212 and an orbital period of 4.82 years. The orbital plane is inclined at an angle of 7.80° relative to the plane of the ecliptic. Infrared measurements provide a diameter estimate of 117.7±0.7 km. It has the spectrum of a carbonaceous C-type asteroid.[5]
Photometric observations of the minor planet in 2011 gave a rotation period of 10.945±0.001 h with an amplitude of 0.09±0.01 in magnitude. This result is consistent with previous determinations.[6] Two stellar occultation events involving this asteroid were observed from multiple sites in 2009. The resulting chords matched a smooth elliptical cross-section with dimensions of 134.0±4.0 km × 108.9±0.7 km.[7]
In popular culture
A space station orbiting 81 Terpsichore is the main setting in the science fiction story The Dark Colony (Asteroid Police Book 1) by Richard Penn.
References
- ↑ 1.0 1.1 Terpsichore (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Terpsichore (Subscription or UK public library membership required.)
- ↑ 2.0 2.1 2.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: pp. 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
- ↑ Asteroid Data Sets
- ↑ Tempel, M. (November 1864), "Minor Planet 81 Terpsichore discovered", Monthly Notices of the Royal Astronomical Society 25: 31, Bibcode: 1864MNRAS..25...31T.
- ↑ "Small-Body Database Lookup: 81 Terpsichore (A864 SA)". Jet Propulsion Laboratory/California Institute of Technology. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=20000081.
- ↑ 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.
- ↑ Timerson, Brad; Durech, J.; Pilcher, F. et al. (October 2010), "Occultations by 81 Terpsichore and 694 Ekard in 2009 at Different Rotational Phase Angles", The Minor Planet Bulletin 37 (4): 140−142, Bibcode: 2010MPBu...37..140T.
External links
- 81 Terpsichore at AstDyS-2, Asteroids—Dynamic Site
- 81 Terpsichore at the JPL Small-Body Database
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