astro.wikisort.org - StarKepler-22 is a sun-like star in the northern constellation of Cygnus, the swan, that is orbited by a planet found to be unequivocally within the star's habitable zone. It is located at the celestial coordinates: Right Ascension 19h 16m 52.2s, Declination +47° 53′ 4.2″.[6] With an apparent visual magnitude of 11.7,[3] this star is too faint to be seen with the naked eye. It can be viewed with a telescope having an aperture of at least 4 in (10 cm).[7] The estimated distance to Kepler-22 is 638 light-years (196 parsecs).[2]
Star in the constellation Cygnus
Kepler-22
Observation data
Epoch J2000 Equinox J2000 |
| Constellation |
Cygnus[1] |
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| Right ascension |
19h 16m 52.1904s[2] |
| Declination |
+47° 53′ 03.948″[2] |
| Apparent magnitude (V) |
11.664[3] |
| Characteristics |
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| Spectral type |
G5V[4] |
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| Astrometry |
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| Proper motion (μ) | RA: −39.717±0.052[2] mas/yr
Dec.: −66.687±0.046[2] mas/yr |
| Parallax (π) | 5.1088 ± 0.0242 mas[2] |
| Distance | 638 ± 3 ly
(195.7 ± 0.9 pc) |
| Absolute magnitude (MV) | ~5.27 |
Absolute bolometric
magnitude (Mbol) | ~4.98 |
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| Details |
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| Mass | 0.970 ± 0.060[3] M☉ |
| Radius | 0.979 ± 0.020[3] R☉ |
| Luminosity | 0.79 ± 0.04[3] L☉ |
| Luminosity (bolometric) | 0.8 L☉ |
| Luminosity (visual, LV) | ~0.67 L☉ |
| Temperature | 5518 ± 44[3] K |
| Metallicity [Fe/H] | –0.29 ± 0.06[3] dex |
| Rotational velocity (v sin i) | 0.6 ± 1.0[3] km/s |
| Age | 7.08+1.50
−1.53 Gyr |
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| Other designations |
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| Database references |
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| SIMBAD | data |
| Exoplanet Archive | data |
| KIC | data |
Extrasolar Planets
Encyclopaedia | data |
Stellar characteristics
Kepler-22 is slightly smaller and cooler than the Sun,[8] with a lower abundance of elements having more mass than helium.[3] It has a spectral type of G5V, while the luminosity class remains undetermined.[4] This star is radiating 79%[3] of the Sun's luminosity from its outer atmosphere at an effective temperature of 5,518 K,[3] giving it the yellow-hued glow of a G-type star.[9] A projected rotational velocity of 0.6 km/s[3] suggests it has a long period of rotation. No flare activity has been detected.[10]
Planetary system
The Kepler-22 planetary system[4]
Companion
(in order from star) |
Mass |
Semimajor axis
(AU) |
Orbital period
(days) |
Eccentricity |
Inclination |
Radius |
| b |
< 0.11 MJ |
0.849 ± 0.018 |
289.8623 +0.016
−0.02 |
— |
89.764 ±0.042° |
2.4 R🜨 |
On December 5, 2011, scientists from the Kepler mission announced that a possible Earth-like world (Kepler-22b) had been discovered orbiting in the star's habitable zone by NASA's Kepler spacecraft.[11] This was significant in that it was the first relatively Earth-sized exoplanet (2.4 times as big)[11] confirmed to be orbiting within a star's habitable zone.[12]
References
- "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Kepler-22b at the Wayback Machine (archived 2011-12-08). Additional archives: NASA's Kepler Mission Confirms Its First Planet in Habitable Zone of Sun-like Star (updated & modified version).
- Schneider, Jean, "Star: Kepler-22", Extrasolar Planets Encyclopaedia, Paris Observatory, retrieved 2020-12-17
- "GSC 03546-02301 -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-08
- Kepler Discoveries at the Wayback Machine (archived April 27, 2012)
- Sherrod, P. Clay; Koed, Thomas L. (2003), A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations, Astronomy Series, Courier Dover Publications, p. 9, ISBN 0486428206
- "Kepler Confirms First Planet in Habitable Zone of Sun-Like Star". Universe Today. 2011-12-05.
- "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16
- Armstrong, D. J.; Pugh, C. E.; Broomhall, A.-M.; Brown, D. J. A.; Lund, M. N.; Osborn, H. P.; Pollacco, D. L. (2015), "The Host Stars of Kepler's Habitable Exoplanets: Superflares, Rotation and Activity", Monthly Notices of the Royal Astronomical Society, 455 (3): 3110–3125, arXiv:1511.05306, doi:10.1093/mnras/stv2419, S2CID 16265095
- Boyle, Rebecca (December 5, 2011). "Kepler Team Confirms First Earth-like planet in a habitable zone, And Finds 1,094 More Worlds". Popular Science. Retrieved December 5, 2011.
- "NASA Telescope Confirms Alien Planet in Habitable Zone". Space.com. 2011-12-05.
На других языках
[de] Kepler-22
Kepler-22 ist ein ca. 600 Lichtjahre von der Erde entfernter Stern. Er liegt zwischen den Sternbildern Schwan und Leier.
In seinem Planetensystem befindet sich Kepler-22b, ein erdähnlicher Exoplanet.
- [en] Kepler-22
[es] Kepler-22
Kepler-22 es una enana amarilla de la constelación septentrional del Cisne.
[ru] Kepler-22
Kepler-22 — звезда спектрального класса G, примерно в 619 световых годах от Земли. Система этой звезды содержит планету, которая является первой экзопланетой в зоне обитаемости, открытой с помощью транзитного метода.
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