Gliese 667 Cc

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Gliese 667 Cc
Extrasolar planet List of extrasolar planets
Gliese 667 Cc sunset.jpg
This artist’s impression shows the view from the exoplanet Gliese 667 Cc
Parent star
Star Gliese 667C
Constellation Scorpius
Right ascension (α) 17h 18m 57.16483s
Declination (δ) −34° 59′ 23.1416″
Apparent magnitude (mV) 11.03
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) 4.39[1] M
Radius (r) 1.76[1] R
Stellar flux (F) 0.875
Temperature (T) 304 K (31 °C) K
Orbital elements
Semimajor 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)
Discovery method Radial velocity (European Southern Observatory)
Discovery status Published refereed article

Gliese 667 Cc is an extrasolar planet, or exoplanet, orbiting around the star Gliese 667 C which is a member of the Gliese 667 triple star system. The minimum mass of Gliese 667 Cc is about 4.39 Earth masses.[1]

Gliese 667 Cc (also known as GJ 667Cc or HR 6426Cc) is in a nearby triple star system (Gliese 667) in the constellation Scorpius, 22.7 light years away. Gliese 667 Cc was first announced in a pre-print made public on 21 November 2011 by the European Southern Observatory's HARPS group using the radial velocity method (Doppler method).[2] 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.[3]

The star Gliese 667 C hosts at least 7 planets and 3 of those, all rocky planets (including Gliese 667 Cc), are within the habitable zone. Gliese 667 Cc is located on the inner edge of the habitable zone. With the semi-major axis of only 0.1251 astronomical units, a year on Gliese 667Cc is only 28.155 days. Gliese 667Cc is said to be one of the most physically similar known exoplanets to Earth with an ESI value of 0.85. 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. Based on black body temperature calculation, GJ 667 Cc should absorb more overall electromagnetic radiation, making it warmer (277.4 K) and placing it slightly closer to the "hot" edge of the habitable zone than Earth (254.3 K).[4]

Comparison to Earth[edit]

Name ESI SPH HZD HZC HZA pClass hClass Distance (ly) Status Year of
0N/A !Earth 1.00 0.72 -0.50 -0.31 -0.52 warm terran mesoplanet 0 non-exoplanet prehistoric
4 Gliese 667 Cc 0.84 0.64 -0.64 -0.15 +0.21 warm superterran[5] mesoplanet 23.6  Confirmed 2011


  1. ^ a b c PHL's Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo
  2. ^ European Southern Observatory. Press information: The HARPS search for southern extra-solar planets. 11.24.2011. [1]
  3. ^ 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
  4. ^ Anglada-Escudé, Guillem; et al. (2013-06-07). "A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone". Astronomy & Astrophysics. arXiv:1306.6074. Bibcode:2013A&A...556A.126A. doi:10.1051/0004-6361/201321331. Retrieved 2013-06-25. 
  5. ^ List of potentially habitable exoplanets#Table