Psi Serpentis
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 44m 01.8197s |
| Declination | +02° 30′ 54.624″ |
| Apparent magnitude (V) | 5.879 |
| Characteristics | |
| Spectral type | ACE: G5V + K2 + G8III |
| U−B color index | 0.25 |
| B−V color index | 0.67 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | +14 km/s |
| Proper motion (μ) | RA: -44.96 mas/yr Dec.: -144.73 mas/yr |
| Parallax (π) | 68.16 ± 0.87 mas |
| Distance | 47.9 ± 0.6 ly (14.7 ± 0.2 pc) |
| Absolute magnitude (MV) | 5.05 |
| Details | |
| Age | 3.2 × 109[1] years |
| Other designations | |
Psi Serpentis (ψ Ser, ψ Serpentis) is a star system in the constellation Serpens. It is approximately 47.9 light years from Earth.
The primary component, Psi Serpentis A, is a yellow G-type main sequence dwarf with an apparent magnitude of +5.86. It has a close 12th magnitude companion, Psi Serpentis B, 4.2 arcseconds, or at least 60 AUs, distant.
When observed from 1997 through 2000, the primary star appeared to be transitioning from a maunder minimum state to a state of cycling magnetic activity.[2]
[edit] References
- ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal 687 (2): 1264–1293. Bibcode 2008ApJ...687.1264M. doi:10.1086/591785.
- ^ Hall, Jeffrey C.; Lockwood, G. W.; Skiff, Brian A. (March 2007), "The Activity and Variability of the Sun and Sun-like Stars. I. Synoptic Ca II H and K Observations", The Astronomical Journal 133 (3): 862–881, Bibcode 2007AJ....133..862H, doi:10.1086/510356
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