60 Serpentis
Star in the constellation Serpens
From Wikipedia, the free encyclopedia
60 Serpentis, also known as c Serpentis, is a single,[8] 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.[1] The distance to this star, as estimated from its annual parallax shift of 25.16±0.31 mas,[2] is approximately 130 light years. It is moving further from the Sun with a heliocentric radial velocity of +28 km/s,[5] having approached as close as 107 ly (32.7 pc) some 1.9 million years ago.[1]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Serpens[1] |
| Right ascension | 18h 29m 40.97948s[2] |
| Declination | −01° 59′ 07.1058″[2] |
| Apparent magnitude (V) | 5.38[1] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K0 III[4] |
| B−V color index | 0.961±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | +28.36±0.34[5] km/s |
| Proper motion (μ) | RA: −85.35[2] mas/yr Dec.: −34.31[2] mas/yr |
| Parallax (π) | 25.16±0.31 mas[2] |
| Distance | 130 ± 2 ly (39.7 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.25±0.07[6] |
| Details | |
| Mass | 1.81±0.49[6] M☉ |
| Radius | 8[5] R☉ |
| Luminosity | 35[5] L☉ |
| Surface gravity (log g) | 2.92±0.11[6] cgs |
| Temperature | 5,059±92[6] K |
| Metallicity [Fe/H] | −0.08[5] dex |
| Rotational velocity (v sin i) | 3.9[5] km/s |
| Age | 1.26+0.19 −0.16[6] Gyr |
| Other designations | |
| c Ser, 60 Ser, BD−02°4641, FK5 1480, HD 170474, HIP 90642, HR 6935, SAO 142348[7] | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K0 III,[4] 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.[9] The star has an estimated 1.8 times the mass of the Sun[6] and 8 times the Sun's radius.[5] It is radiating 35 times the Sun's luminosity[5] from its enlarged photosphere at an effective temperature of about 5,059 K.[6]