Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Serpens |
Right ascension | 15h 46m 26.61423s [1] |
Declination | +07° 21′ 11.0475″ [1] |
Apparent magnitude (V) | 4.43 [2] |
Characteristics | |
Spectral type | G0 V [3] |
U−B color index | +0.11 [2] |
B−V color index | +0.60 [2] |
Variable type | Suspected |
Astrometry | |
Radial velocity (Rv) | −66.4 [4] km/s |
Proper motion (μ) |
RA: −224.0±0.2
mas/
yr
[1] Dec.: −69.8±0.3 mas/ yr [1] |
Parallax (π) | 83.92 ± 0.15 mas [1] |
Distance | 38.87 ± 0.07
ly (11.92 ± 0.02 pc) |
Absolute magnitude (MV) | 4.01 [5] |
Details | |
Mass | 1.14 [6] M☉ |
Radius | 1.26±0.07 [7] R☉ |
Luminosity | 1.94 [6] L☉ |
Surface gravity (log g) | 4.09 [8] cgs |
Temperature | 6,087±174 [7] K |
Metallicity [Fe/H] | −0.03 [8] dex |
Rotational velocity (v sin i) | 3 [9] km/s |
Age | 3.8–6.7 [10] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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 38.9 light-years (11.9 parsecs) 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 7.371 ± 0.258 light-years (2.260 ± 0.079 parsecs), before moving away thereafter. [11]
This star is 26% larger [7] and 14% more massive than the Sun, although it has a similar stellar classification. [1] 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 6,087 K. [7] A periodicity of 1837 days (5.03 years) was suspected by Morbey & Griffith (1987), [12] but it is probably bound to stellar activity. However, McDonald Observatory team has set limits to the presence of one or more exoplanets [12] around Lambda Serpentis with masses between 0.16 and 2 Jupiter masses and average separations spanning between 0.05 and 5.2 Astronomical Units.
In 2020, a candidate planet was detected orbiting Lambda Serpentis (HD 141004). With a minimum mass of 0.043 MJ (13.6 ME) and an orbital period of 15 days, this would most likely be a hot Neptune. [13] The discovery of planet was confirmed in 2021. [14]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 0.0428+0.0047 −0.0045 MJ |
0.1238±0.002 | 15.5083+0.0016 −0.0018 |
0.16+0.11 −0.10 |
— | — |
{{
citation}}
: CS1 maint: multiple names: authors list (
link)
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Serpens |
Right ascension | 15h 46m 26.61423s [1] |
Declination | +07° 21′ 11.0475″ [1] |
Apparent magnitude (V) | 4.43 [2] |
Characteristics | |
Spectral type | G0 V [3] |
U−B color index | +0.11 [2] |
B−V color index | +0.60 [2] |
Variable type | Suspected |
Astrometry | |
Radial velocity (Rv) | −66.4 [4] km/s |
Proper motion (μ) |
RA: −224.0±0.2
mas/
yr
[1] Dec.: −69.8±0.3 mas/ yr [1] |
Parallax (π) | 83.92 ± 0.15 mas [1] |
Distance | 38.87 ± 0.07
ly (11.92 ± 0.02 pc) |
Absolute magnitude (MV) | 4.01 [5] |
Details | |
Mass | 1.14 [6] M☉ |
Radius | 1.26±0.07 [7] R☉ |
Luminosity | 1.94 [6] L☉ |
Surface gravity (log g) | 4.09 [8] cgs |
Temperature | 6,087±174 [7] K |
Metallicity [Fe/H] | −0.03 [8] dex |
Rotational velocity (v sin i) | 3 [9] km/s |
Age | 3.8–6.7 [10] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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 38.9 light-years (11.9 parsecs) 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 7.371 ± 0.258 light-years (2.260 ± 0.079 parsecs), before moving away thereafter. [11]
This star is 26% larger [7] and 14% more massive than the Sun, although it has a similar stellar classification. [1] 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 6,087 K. [7] A periodicity of 1837 days (5.03 years) was suspected by Morbey & Griffith (1987), [12] but it is probably bound to stellar activity. However, McDonald Observatory team has set limits to the presence of one or more exoplanets [12] around Lambda Serpentis with masses between 0.16 and 2 Jupiter masses and average separations spanning between 0.05 and 5.2 Astronomical Units.
In 2020, a candidate planet was detected orbiting Lambda Serpentis (HD 141004). With a minimum mass of 0.043 MJ (13.6 ME) and an orbital period of 15 days, this would most likely be a hot Neptune. [13] The discovery of planet was confirmed in 2021. [14]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 0.0428+0.0047 −0.0045 MJ |
0.1238±0.002 | 15.5083+0.0016 −0.0018 |
0.16+0.11 −0.10 |
— | — |
{{
citation}}
: CS1 maint: multiple names: authors list (
link)