Gliese 667 Cc
| Exoplanet | List of exoplanets | |
|---|---|---|
 | ||
| Parent star | ||
| Star | Gliese 667C | |
| Constellation | Scorpius | |
| Right ascension | (α) | 17h 18m 57.16483s |
| Declination | (δ) | −34° 59′ 23.1416″ |
| Apparent magnitude | (mV) | 10.20 |
| Mass | (m) | 0.31 M☉ |
| Radius | (r) | 0.42 R☉ |
| Temperature | (T) | 3700 K |
| Metallicity | [Fe/H] | −0.59 ± 0.10 |
| Age | 2–10 Gyr | |
| Physical characteristics | ||
| Mass | (m) | 3.8[1] M⊕ |
| Radius | (r) | 1.54[1] R⊕ |
| Stellar flux | (F⊙) | 0.875 ⊕ |
| Temperature | (T) | 277.4 K (4.3 °C; 39.6 °F) |
| Orbital elements | ||
| Semi-major axis | (a) | 0.1251 ± 0.03 AU |
| Eccentricity | (e) | <0.27 |
| Orbital period | (P) | 28.155 ± 0.017 d |
| Inclination | (i) | >30° |
| Semi-amplitude | (K) | 1.5 m/s |
| Discovery information | ||
| Discovery date | 2011 (mentioned), 2012 (announced) | |
| Discoverer(s) | ||
| Discovery method | Radial velocity (European Southern Observatory) | |
| Discovery status | Published refereed article | |
| Other designations | ||
| Gliese 667 Cc, GJ 667 Cc, HR 6426Cc, HD 156384Cc
| ||
Gliese 667 Cc (also known as GJ 667Cc, HR 6426Cc, or HD 156384Cc)[2] is an exoplanet 23.62 light years away. It orbits around Gliese 667 C, which is a member of the Gliese 667 triple star system, in the constellation of Scorpius.
Gliese 667 Cc was first announced in a pre-print made public on 21 November 2011 by the European Southern Observatory's High Accuracy Radial Velocity Planet Searcher (HARPS) group using the radial velocity method (Doppler method).[3] However, the announcement of a refereed journal report came on 2 February 2012 by researchers at the University of Göttingen and the Carnegie Institution for Science.[4]
The orbit of Gliese 667Cc has a semi-major axis of 0.1251 astronomical units, making its year 28.155 Earth-days long.
Based on GJ 667 C's bolometric luminosity, GJ 667 Cc would receive 90% of the light Earth does; however, much of that electromagnetic radiation would be in the invisible infrared light part of the spectrum. In fact, taking into account solely the star's visual luminosity, the planet actually only receives 20% of the visible light Earth does.
Gliese 667 Cc is heavier than Earth with a minimum mass of about 3.8 Earth masses.[1] Based on black body temperature calculation, GJ 667 Cc should absorb similar but slightly more overall electromagnetic radiation than Earth, making it a little bit warmer (277.4 K (4.3 °C; 39.6 °F)) and consequently placing it slightly closer to the "hot" inner edge of the habitable zone than Earth (254.3 K (−18.8 °C; −1.9 °F)).[5] According to PHL, Gliese 667 Cc is the most Earth-like exoplanet located in the conservative habitable zone of its parent star.[6]
Comparison to Earth
The star Gliese 667 C could host at least 7 planets and 3 of those, all rocky planets (including Gliese 667 Cc), are potentially within the habitable zone.
In fiction
Gliese 667 Cc features in the story The Audience by Sean McMullen in the June 2015 issue of Analog Science Fiction and Fact. In the Alien vs Predator franchise, Gliese 667 Cc was the first planet to be terraformed, being done so by the Weyland Corporation in 2039.
See also
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Wikimedia Commons has media related to Gliese 667 Cc. |
- KELT-4Ab, another exoplanet in a triple star system
- List of potentially habitable exoplanets
References
- 1 2 3 PHL's Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo
- ↑ "HD 156384Cc -- Extra-solar Confirmed Planet". SIMBAD. Retrieved 2015-10-31.
- ↑ European Southern Observatory. Press information: The HARPS search for southern extra-solar planets. 11.24.2011.
- ↑ University of Göttingen. Presseinformation: Wissenschaftler entdecken möglicherweise bewohnbare Super-Erde - Göttinger Astrophysiker untersucht Planeten in 22 Lichtjahren Entfernung. Nr. 17/2012 - 02.02.2012. Announcement on university homepage, retrieved 2012-02-02
- ↑ Anglada-Escudé, Guillem; et al. (2013-06-07). "A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone" (PDF). Astronomy & Astrophysics. arXiv:1306.6074. Bibcode:2013A&A...556A.126A. doi:10.1051/0004-6361/201321331. Retrieved 2013-06-25.
- ↑ https://web.archive.org/web/20160109001847/http://phl.upr.edu/projects/habitable-exoplanets-catalog
| Preceded by Gliese 581 g |
Highest ESI for an Exoplanet 2011 — 2015 |
Succeeded by Kepler-438b |
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