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Red giant star in the constellation Virgo From Wikipedia, the free encyclopedia
1 Serpentis (1 Ser) is a red giant in the constellation Virgo with an apparent magnitude of 5.5. It is a red clump giant, a cool horizontal branch star that is fusing helium in its core.[3] It has expanded to over 13 times the radius of the Sun and although it is cooler at 4,581 K it is 77 times more luminous. It is 322 light years away.
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Virgo |
Right ascension | 14h 57m 33.251s [1] |
Declination | −00° 10′ 03.40″ [1] |
Apparent magnitude (V) | 5.5[2] |
Characteristics | |
Evolutionary stage | Red clump[3] |
Spectral type | K1III[4] |
Astrometry | |
Radial velocity (Rv) | 20.12[5] km/s |
Proper motion (μ) | RA: +59.929[1] mas/yr Dec.: −26.500[1] mas/yr |
Parallax (π) | 10.1280 ± 0.1010 mas[1] |
Distance | 322 ± 3 ly (98.7 ± 1.0 pc) |
Absolute magnitude (MV) | +0.76[6] |
Details | |
Mass | 1.37[2] M☉ |
Radius | 13.6[1] R☉ |
Luminosity | 75[1] L☉ |
Surface gravity (log g) | 2.5[5] cgs |
Temperature | 4,581[5] K |
Metallicity [Fe/H] | −0.07[5] dex |
Rotational velocity (v sin i) | 3.4[5] km/s |
Age | 4.58[3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
The Flamsteed designation 1 Serpentis was given to the star when the constellation Serpens was combined with the constellation Ophiuchus.[7] It was also given the Bayer designation M Serpentis. When Ophiuchus and Serpens were separated into distinct constellations, 1 Serpentis was left over the border in Libra. Since then it has moved slightly and is now in Virgo.[8]
A 10th-magnitude companion star discovered by William Herschel is 86″ away.[9] It is at the same distance as 1 Ser and shares a common proper motion,[10] It is considered likely to be a physical companion,[11] with the two stars separated by 8,600 au.[12] It has a spectral type of G5 IV,[12] and it is slightly smaller and less luminous than the sun.[10]
A much more widely-separated 10th-magnitude star is also listed in multiple star catalogues,[9] but it is an unrelated background object.[13]
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