Gamma Serpentis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 56m 27.18269s |
| Declination | +15° 39′ 41.8206″ |
| Apparent magnitude (V) | 3.85 |
| Characteristics | |
| Spectral type | F6 V |
| U−B color index | -0.03 |
| B−V color index | +0.48 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | 6.78 ± 0.09 km/s |
| Proper motion (μ) |
RA: 310.93 ± 0.20 mas/yr Dec.: -1282.19 ± 0.18 mas/yr |
| Parallax (π) | 88.86 ± 0.18mas |
| Distance | 36.70 ± 0.07 ly (11.25 ± 0.02 pc) |
| Absolute magnitude (MV) | 3.60 |
| Details | |
| Mass | 1.30 ± 0.15 M☉ |
| Radius | 1.55 ± 0.05 R☉ |
| Luminosity | 3.02 ± 0.09 L☉ |
| Surface gravity (log g) | 4.23 cgs |
| Temperature | 6,350 ± 310 K |
| Metallicity [Fe/H] | −0.19 dex |
| Rotational velocity (v sin i) | 10.2 km/s |
| Age | 3.49 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma Serpentis (γ Serpentis, γ Ser) is a star in the equatorial constellation Serpens, in the part of the constellation that represents the serpent's head (Serpens Caput). It has an apparent visual magnitude +3.85, which means it is visible to the naked eye. Based upon parallax measurements by the Hipparcos spacecraft, this star is approximately 36.7 light years from Earth.
Gamma Serpentis is an ordinary F-type main sequence star with a stellar classification of F6 V. It is larger and more massive than the Sun, with three times the solar luminosity. Based upon its mass, it may have a convection zone in its core region. The projected rotational velocity along the equator is 10.2 km/s. It is younger than the Sun with an estimated age of 3.5 billion years. The effective temperature of the star's outer atmosphere is 6,350 K, giving it the yellow-white-hued glow of an F-type star.
Occasionally Gamma Serpentis is listed as having two 10th magnitude companions, but it appears that these stars are just optical neighbours.
It was a member of indigenous Arabic asterism al-Nasaq al-Sha'āmī, "the Northern Line" of al-Nasaqān "the Two Lines", along with β Her (Kornephoros), γ Her (Hejian, Ho Keen) and β Ser (Chow).
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