Gliese 581 f
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| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
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| Parent star | ||
| Star | Gliese 581 | |
| Constellation | Libra | |
| Right ascension | (α) | 15h 19m 26s |
| Declination | (δ) | −07° 43′ 20″ |
| Apparent magnitude | (mV) | 10.55 |
| Distance | 20.3 ± 0.3 ly (6.2 ± 0.1 pc) |
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| Spectral type | M3V | |
| Mass | (m) | 0.31 M☉ |
| Radius | (r) | 0.29 R☉ |
| Temperature | (T) | 3480 ± 48 K |
| Metallicity | [Fe/H] | -0.33 ± 0.12 |
| Age | 7 – 11 Gyr | |
| Orbital elements Epoch JD 2451409.762[1] |
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| Semimajor axis | (a) | 0.758 ± 0.015[1] AU |
| Eccentricity | (e) | 0[1] |
| Orbital period | (P) | 433 ± 13[1] d (1.19 y) |
| (10400 h) | ||
| Mean anomaly | (M) | 118 ± 68[1]° |
| Semi-amplitude | (K) | 1.30 ± 0.22[1] m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 7.0 ± 1.2[1] M⊕ |
| Discovery information | ||
| Discovery date | 29 September 2010 | |
| Discoverer(s) | Vogt et al. | |
| Detection method | Radial velocity | |
| Discovery site | Keck Observatory, Hawaii | |
| Discovery status | Unconfirmed[2] | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
Gliese 581 f or Gl 581 f is an unconfirmed planet in the Gliese 581 system, located 20 light years (about 120 trillion miles) from Earth. It is the fifth planet discovered in the system and the sixth known in order from the star. Its discovery was announced September 29, 2010.
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Overview [edit]
The planet was detected using radial velocity measurements combining the data from the HIRES instrument of the Keck 1 telescope and the HARPS instrument of ESO's 3.6m telescope at La Silla Observatory.[1]
The planet has a minimum mass of 7.0 Earth masses, suggesting that it may be either a large terrestrial planet (super earth) or a gaseous planet similar to Neptune. It orbits at a distance from its star of 0.758 AU, slightly more than Venus's distance from our Sun, but it is likely to be far too cold at its surface for liquid water.
Existence [edit]
The existence of this planet is controversial. Follow-up studies incorporating updated data from HARPS have not confirmed its existence,[3][4][5] and it appears the radial velocity variations at this period may instead be associated with the stellar activity cycle of Gliese 581 itself rather than any orbiting planet.[6]
References [edit]
- ^ a b c d e f g h Vogt, Steven S.; Butler, R. Paul; Rivera, Eugenio J.; Haghighipour, Nader; Henry, Gregory W.; Williamson, Michael H. (2010-09-29). "The Lick-Carnegie Exoplanet Survey: A 3.1 M_Earth Planet in the Habitable Zone of the Nearby M3V Star Gliese 581". arXiv:1009.5733.
- ^ "Notes for star Gl 581". The Extrasolar Planets Encyclopaedia. Retrieved 2010-10-11.
- ^ T. Forveille, X. Bonfils, X.Delfosse, R. Alonso, S. Udry, F. Bouchy, M. Gillon, C. Lovis, V. Neves, M. Mayor, F. Pepe, D. Queloz, N.C. Santos, D. Segransan, J.M. Almenara, H. Deeg, M. Rabus (2011). "The HARPS search for southern extra-solar planets XXXII. Only 4 planets in the Gl 581 system". arXiv:1109.2505 [astro-ph.EP].
- ^ Baluev, Roman V. (2013). "The impact of red noise in radial velocity planet searches: only three planets orbiting GJ 581?". Monthly Notices of the Royal Astronomical Society 429 (3): 2052–2068. Bibcode:2013MNRAS.429.2052B. doi:10.1093/mnras/sts476.
- ^ Tuomi, Mikko; Jenkins, James S. (2012). "Counting the number of planets around GJ 581. False positive rate of Bayesian signal detection methods". arXiv:1211.1280 [astro-ph.EP].
- ^ Robertson, Paul; Endl, Michael; Cochran, William D.; Dodson-Robinson, Sarah E. (2013). "Hα Activity of Old M Dwarfs: Stellar Cycles and Mean Activity Levels for 93 Low-mass Stars in the Solar Neighborhood". The Astrophysical Journal 764 (1): article id. 3. Bibcode:2013ApJ...764....3R. doi:10.1088/0004-637X/764/1/3.
External links [edit]
Media related to Gliese 581 f at Wikimedia Commons
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Coordinates: 
15h 19m 27s, −07° 43′ 19″
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