Psi 1 Aquarii
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Double star ψ 1 Aquarii |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| AladinLite | |||||||||||||||||||||||||||||
| Constellation | Aquarius | ||||||||||||||||||||||||||||
| Right ascension | 23 h 16 m | ||||||||||||||||||||||||||||
| declination | -09 ° 05 ′ | ||||||||||||||||||||||||||||
| Apparent brightness | 4.2 likes | ||||||||||||||||||||||||||||
| Known exoplanets |
1 |
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| Astrometry | |||||||||||||||||||||||||||||
| Radial velocity | (−26.4 ± 0.9) km / s | ||||||||||||||||||||||||||||
| parallax | (21.97 ± 0.89) mas | ||||||||||||||||||||||||||||
| distance | (148 ± 6) ly ((45.5 ± 1.8) pc ) |
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| Proper movement : | |||||||||||||||||||||||||||||
| Rec. Share: | +369 mas / a | ||||||||||||||||||||||||||||
| Dec. portion: | −17 mas / a | ||||||||||||||||||||||||||||
| orbit | |||||||||||||||||||||||||||||
| Major semi-axis | A-BC: 49 ", 2 B-C: 0", 2 |
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| Individual data | |||||||||||||||||||||||||||||
| Names | A; B / C | ||||||||||||||||||||||||||||
| Observation data: | |||||||||||||||||||||||||||||
| Apparent brightness | A. | 4.2 likes | |||||||||||||||||||||||||||
| B / C | common: 9.2 mag B: 9.6 mag / C: 10.1 mag |
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| Typing: | |||||||||||||||||||||||||||||
| Spectral class | A. | K0 III | |||||||||||||||||||||||||||
| B / C | common: K3 | ||||||||||||||||||||||||||||
| Other names and catalog entries |
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ψ 1 Aquarii ( Psi 1 Aquarii , abbreviated ψ 1 Aqr ) is a multiple star system that can be found about 150 light-years away from Earth in the constellation Aquarius .
Stars
ψ 1 Aquarii A is the main star of the system and a giant star with spectral type K0 III and an apparent magnitude of +4.2 mag. At a distance of 49.2 arcseconds there is a double system of two stars, ψ 1 Aquarii B and ψ 1 Aquarii C , which have an angular distance of 0.2 arc seconds and their apparent brightnesses are each around 10 mag.
Exoplanet
In 2003 it was discovered with the help of the radial velocity method that ψ 1 Aquarii A is orbited by a companion named 91 Aquarii b , HD 219449 b or ψ 1 Aquarii b (Psi 1 Aquarii b). The exoplanet has at least three times the mass of Jupiter and orbits the main star on an almost circular orbit in about half a year (181.84 days). Its distance to its own star corresponds to 0.324 AU ( i.e. it is 0.324 times as far from its star as the earth is from the sun).
swell
- D. Mitchell, S. Frink, A. Quirrenbach, D. Fischer, G. Marcy, and P. Butler : Four Substellar Companions Found Around Nearby K Giant Stars . In: AAS . 2003.