Psi-1 Aquarii
From Wikipedia, the free encyclopedia
| Observation data Equinox J2000.0 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 15m 53.5s |
| Declination | −9° 05′ 16″ |
| Apparent magnitude (V) | +4.24 |
| Characteristics | |
| Spectral type | K0III |
| U-B color index | ? |
| B-V color index | ? |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | -26.4 km/s |
| Proper motion (μ) | RA: 368.56 mas/yr Dec.: -17.02 mas/yr |
| Parallax (π) | 21.97 ± 0.89 mas |
| Distance | 148 ly (46 pc) |
| Absolute magnitude (MV) | 0.95 |
| Details | |
| Mass | 2.5 M☉ |
| Radius | 8.55 R☉ |
| Luminosity | 33 L☉ |
| Temperature | 5250 K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
Psi-1 Aquarii (ψ1 Aqr / ψ1 Aquarii) is a Multiple star system approximately 148 light-years away in the constellation Aquarius.
Contents |
[edit] Stars
The primary star, Psi-1 Aquarii A, is an orange giant star with an apparent magnitude of +4.24. At a separation of 49.6 arcseconds from the primary is a binary companion composed of two 10th magnitude stars, Psi-1 Aquarii B and C. They are 0.3 arcseconds from each other. The system has two other components, the 13th magnitude Psi-1 Aquarii D, 80.4 arcseconds from the primary and the 14th magnitude Psi-1 Aquarii E, 19.7 arcseconds from B.
[edit] Planetary system
In 2003, the discovery of an extrasolar planet orbiting a giant star was announced.
| Companion (In order from star) |
Mass (MJ) |
Orbital period (days) |
Semimajor axis (AU) |
Eccentricity |
|---|---|---|---|---|
| b | 2.9 | 182 | 0.3 | 0 |
[edit] See also
[edit] External links
- SIMBAD: HD 219449 -- High proper-motion Star
- Extrasolar Planets Encyclopaedia: HD 219449 + HD 219449 b
- Extrasolar Visions: 91 Aquarii + 91 Aquarii b
 |
This giant star-related article is a stub. You can help Wikipedia by expanding it. |
 |
This extrasolar planet related article is a stub. You can help Wikipedia by expanding it. |
