Gliese 15 Ab
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | Groombridge 34 | |
| Constellation | Andromeda | |
| Right ascension | (α) | 00h 18m 22.89s |
| Declination | (δ) | –44° 01′ 22.6″ |
| Apparent magnitude | (mV) | 8.09 |
| Distance | 11.7±0.1 ly (3.5 pc) | |
| Spectral type | M3.5 + M1.5v | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.0717 AU |
| Eccentricity | (e) | 0.12 |
| Orbital period | (P) | 0.01 y |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 5.35 M⊕ |
| Discovery information | ||
| Discovery date | August, 2014 | |
| Discoverer(s) | Andrew Howard, | |
| Discovery method | HIRES | |
| Discovery site | Keck Observatory | |
| Discovery status | Published | |
| Other designations | ||
| Gliese 15 Ab, Gl 15 Ab, GJ 15 Ab, Groombridge 34 Ab | ||
| Database references | ||
| Extrasolar Planets Encyclopaedia | 34&p2=b data | |
| SIMBAD | 34+b data | |
| Exoplanet Archive | 34+b data | |
| Open Exoplanet Catalogue | 34+b data | |
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Gliese 15 Ab (Gl 15 Ab GJ 15Ab) also commonly called Groombridge 34 Ab [note 1] is an extrasolar planet approximately 11 light years away in the constellation of Andromeda, and is found in the night sky at Right ascension 00h 18m 22.89s and Declination +44° 01′ 22.6″[1]
It was discovered in August 2014.[2] deduced from analysis of the radial velocities of the parent Star by the Eta-Earth Survey using HIRES at Keck Observatory. Planet "b" has around 5.35 ± 0.75 Earth masses,[2] and is thought to be a Super-Earth with a diameter greater than that of the Earth.
Gliese 15 Ab has a close inner orbit around Gliese 15 A with a semi-major axis of only 0.0717 +/- 0.0034 AU, making an orbital period that is just a little longer than 11.4 days, the orbit appears to be relatively circular (e= 0.12 +0.08/-0.06). It orbits too close to Gliese 15 A to be located in the habitable zone and is unlikely to harbour life as we know.
Notes
- ↑ Actually, in the discovery paper discoverers call this object "Gl 15 Ab", and never "Groombridge 34 Ab".
References
- ↑ F. van Leeuwen (2007) Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2): 653–664.
- 1 2 Andrew Howard, Geoffrey Marcy, Debra A. Fischer, Howard Isaacson, Philip S. Muirhead, Gregory W. Henry, Tabetha S. Boyajian, Kaspar von Braun, Juliette C. Becker, Jason T. Wright, John Asher Johnson, Astrophysics Earth and Planetary Astrophysics : The NASA-UC-UH Eta-Earth Program: IV. A Low-mass Planet Orbiting an M Dwarf 3.6 PC from Earth.