Astronomy:34 Circe
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.png) A three-dimensional model of 34 Circe based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | J. Chacornac |
| Discovery date | 6 April 1855 |
| Designations | |
Designation | (34) Circe |
| Pronunciation | /ˈsɜːrsiː/[1] |
| Named after | Circe |
| 1965 JL | |
| Minor planet category | Main belt |
| Adjectives | Circean /sərˈsiːən/[2] |
| Orbital characteristics[3] | |
| Epoch 21 November 2025 (JD 2461000.5) | |
| |{{{apsis}}}|helion}} | 2.975 AU |
| |{{{apsis}}}|helion}} | 2.401 AU |
| 2.688 AU | |
| Eccentricity | 0.107 |
| Orbital period | 4.407 yr (1609.636 d) |
| Average Orbital speed | 18.12 km/s |
| Mean anomaly | 305.209° |
| Inclination | 5.496° |
| Longitude of ascending node | 184.294° |
| 329.414° | |
| Jupiter MOID | 2.023 AU |
| TJupiter | 3.358 |
| Physical characteristics | |
| Mean diameter | 132.992±1.033 km[4] |
| Mass | (8.5±1.6)×1017 kg[5][lower-alpha 1] |
| Mean density | 0.70 g/cm3[5] |
| ~0.0317 m/s² | |
| ~0.0600 km/s | |
| Rotation period | 0.5063 d (12.15 h) [3] |
| Albedo | 0.0541 [3] |
| Physics | ~172 K |
Spectral type | C |
| Absolute magnitude (H) | 8.51 |
34 Circe is a large, very dark main-belt asteroid. It was discovered by French astronomer J. Chacornac on 6 April 1855, and named after Circe, the bewitching queen of Aeaea island in Greek mythology.
The spectrum of this object matches a C-type asteroid, suggesting a carbonaceous composition. It has a cross-section size of 113 km and is orbiting the Sun with a period of 4.40 years. Photometric observations of this asteroid made during 2007 at the Organ Mesa Observatory in Las Cruces, New Mexico gave an asymmetrical bimodal light curve with a period of 12.176 ± 0.002 hours and a brightness variation of 0.17 ± 0.02 in magnitude.[6] The spectra of the asteroid displays evidence of aqueous alteration.[7]
Notes
- ↑ Calculated from its standard gravitational parameter GM = 0.057±0.011 km3/s2.
References
- ↑ "Circe". Circe. Oxford University Press. http://www.lexico.com/definition/Circe.
- ↑ Circean (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Circean (Subscription or UK public library membership required.)
- ↑ 3.0 3.1 3.2 Yeomans, Donald K., "34 Circe", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=34, retrieved 2013-12-21.
- ↑ "34 Circe (A855 GA)". https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=34%20Circe.
- ↑ 5.0 5.1 Fuentes-Muñoz, Oscar; Farnocchia, Davide; Giorgini, Jon D.; Park, Ryan S. (2025-12-01). "Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release". The Astronomical Journal 170 (6): 353. doi:10.3847/1538-3881/ae0cc9. ISSN 0004-6256. Bibcode: 2025AJ....170..353F.
- ↑ Pilcher, Frederick (September 2008), "Period Determinations for 26 Proserpina, 34 Circe 74 Galatea, 143 Adria, 272 Antonia, 419 Aurelia, and 557 Violetta", The Minor Planet Bulletin 35 (3): 135–138, Bibcode: 2008MPBu...35..135P.
- ↑ Fornasier, S. et al. (February 1999), "Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites", Astronomy and Astrophysics Supplement 135: 65−73, doi:10.1051/aas:1999161, Bibcode: 1999A&AS..135...65F, https://ui.adsabs.harvard.edu/link_gateway/1999A&AS..135...65F/PUB_PDF.
External links
- 34 Circe at AstDyS-2, Asteroids—Dynamic Site
- 34 Circe at the JPL Small-Body Database
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