60 Serpentis, also known as c Serpentis, is a single,[7] orange-hued star in Serpens Cauda, the eastern section of the constellation Serpens. It is faintly visible to the naked eye with an apparent visual magnitude of 5.38.[2] The distance to this star, as estimated from its annual parallax shift of 25.16±0.31 mas,[1] is approximately 130 light years. It is moving further from the Sun with a heliocentric radial velocity of +28 km/s,[4] having approached as close as 107 ly (32.7 pc) some 1.9 million years ago.[2]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Serpens |
Right ascension | 18h 29m 40.97948s[1] |
Declination | −01° 59′ 07.1058″[1] |
Apparent magnitude (V) | 5.38[2] |
Characteristics | |
Spectral type | K0 III[3] |
B−V color index | 0.961±0.004[2] |
Astrometry | |
Radial velocity (Rv) | +28.36±0.34[4] km/s |
Proper motion (μ) | RA: −85.35[1] mas/yr Dec.: −34.31[1] mas/yr |
Parallax (π) | 25.16 ± 0.31 mas[1] |
Distance | 130 ± 2 ly (39.7 ± 0.5 pc) |
Absolute magnitude (MV) | 1.25±0.07[5] |
Details | |
Mass | 1.81±0.49[5] M☉ |
Radius | 8[4] R☉ |
Luminosity | 35[4] L☉ |
Surface gravity (log g) | 2.92±0.11[5] cgs |
Temperature | 5,059±92[5] K |
Metallicity [Fe/H] | −0.08[4] dex |
Rotational velocity (v sin i) | 3.9[4] km/s |
Age | 1.26+0.19 −0.16[5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K0 III,[3] having used up its core hydrogen and expanded. At the age of around 1.26 billion years, it currently belongs to the so-called "red clump", which indicates it is on the horizontal branch and is generating energy through helium fusion at its core.[8] The star has an estimated 1.8[5] times the mass of the Sun and 8[4] times the Sun's radius. It is radiating 35[4] times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 5,059 K.[5]