Kappa Serpentis
Kappa Serpentis, Latinised from κ Serpentis, is a single, red-hued star in the constellation Serpens, in its head (Serpens Caput). It has the proper name Gudja /ˈɡuːdʒə/ and the Flamsteed designation 35 Serpentis. This star is visible to the naked eye with an apparent visual magnitude of +4.09. It is located approximately 382 light years from the Sun, based on parallax, and is drifting closer with a radial velocity of −38 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 48m 44.37676s |
| Declination | +18° 08′ 29.6342″ |
| Apparent magnitude (V) | 4.09 |
| Characteristics | |
| Spectral type | M0.5III |
| U−B color index | +1.95 |
| B−V color index | +1.62 |
| Astrometry | |
| Radial velocity (Rv) | −38.48 km/s |
| Proper motion (μ) | RA: −51.88 mas/yr Dec.: −88.10 mas/yr |
| Parallax (π) | 8.54 ± 0.23 mas |
| Distance | 380 ± 10 ly (117 ± 3 pc) |
| Absolute magnitude (MV) | −1.25 |
| Details | |
| Radius | 51.3+5.1 −4.9 R☉ |
| Luminosity | 628.0±33.8} L☉ |
| Temperature | 4,033+206 −185} K |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object is an aging red giant star with a stellar classification of M0.5III. After exhausting the supply of hydrogen at its core, the star cooled and expanded off the main sequence, and now has around 51 times the Sun's radius. It is radiating 628 times the luminosity of the Sun from its photosphere at an effective temperature of 4,033 K. This is a suspected variable star.