Lambda Serpentis
Template:Location mark Location of λ Serpentis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.43[2] |
| Characteristics | |
| Spectral type | G0 V[3] |
| U−B Template:Engvar | +0.11[2] |
| B−V Template:Engvar | +0.60[2] |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | −66.4[4] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 83.92±0.15 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 4.01[5] |
| Details[6] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | 4.09[7] cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | −0.03[7] dex |
| Rotation | Script error: No such module "val". days |
| Rotational velocity (v sin i) | 3[8] km/s |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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Lambda Serpentis, Latinized from λ Serpentis, is a star in the constellation Serpens, in its head (Serpens Caput). It has an apparent visual magnitude of 4.43,[2] making it visible to the naked eye. Based upon parallax measurements, this star lies at a distance of about Script error: No such module "convert". from Earth.[1] Lambda Serpentis is moving toward the Solar System with a radial velocity of 66.4 km s−1.[4] In about 166,000 years, this system will make its closest approach of the Sun at a distance of Script error: No such module "convert"., before moving away thereafter.[9]
This star is 36% larger and 9% more massive than the Sun, although it has a similar stellar classification. It is shining with nearly double the Sun's luminosity and this energy is being radiated from the star's outer atmosphere at an effective temperature of 5,901 K.[6] A periodicity of 1837 days (5.03 years) was suspected by Morbey & Griffith (1987),[10] but it is probably bound to stellar activity. However, McDonald Observatory team has set limits to the presence of one or more exoplanets[10] around Lambda Serpentis with masses between 0.16 and 2 Jupiter masses and average separations spanning between 0.05 and 5.2 Astronomical Units.
Planetary system
In 2020, a candidate planet was detected orbiting Lambda Serpentis (HD 141004). With a minimum mass of 0.043 Template:Jupiter mass (13.6 Template:Earth mass) and an orbital period of 15 days, this would most likely be a hot Neptune.[11] The planet was confirmed in 2021.[12]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet
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References
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Further reading
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