Psi Serpentis

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ψ Serpentis
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 15h 44m 01.821s[1]
Declination +02° 30′ 54.63″[1]
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: -43.11 ± 0.79[1] mas/yr
Dec.: -143.57 ± 0.56[1] mas/yr
Parallax (π) 68.22 ± 0.66[1] mas
Distance 47.8 ± 0.5 ly
(14.7 ± 0.1 pc)
Absolute magnitude (MV) 5.05
Details
Age 3.2 × 109[2] years
Other designations
23 Serpentis, HR 5853, HD 140538 + HD 140527 + HD 140489, SAO 121152, HIP 77052 + HIP 77043 + HIP 77034, ADS 9763, CCDM 15439+0230

Psi Serpentis (ψ Ser, ψ Serpentis) is a star system in the constellation Serpens. It is approximately 47.8 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.[3]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ 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. arXiv:0807.1686. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785. 
  3. ^ 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 

External links[edit]