Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 04h 06m 35.04360s [1] |
Declination | 50° 21′ 04.5500″ [1] |
Apparent magnitude (V) | 4.29 [2] |
Characteristics | |
Spectral type | A0IVn [3] |
U−B color index | −0.04 [2] |
B−V color index | +0.02 [2] |
Astrometry | |
Radial velocity (Rv) | +6.1±2.0 [4] km/s |
Proper motion (μ) |
RA: −12.75
[1]
mas/
yr Dec.: −35.60 [1] mas/ yr |
Parallax (π) | 7.73 ± 0.22 mas [1] |
Distance | 420 ± 10
ly (129 ± 4 pc) |
Absolute magnitude (MV) | −1.31 [5] |
Details | |
Radius | 3.1 [6] R☉ |
Luminosity | 348 [5] L☉ |
Surface gravity (log g) | 4.05 [7] cgs |
Temperature | 10,585 [7] K |
Metallicity [Fe/H] | +0.01 [7] dex |
Rotational velocity (v sin i) | 196 [8] km/s |
Age | 345 [9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
λ Persei, Latinized as Lambda Persei, is a star in the northern constellation of Perseus. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.29. [2] This object is located approximately 422 light years from the Sun based on parallax, [1] and is drifting further away with a radial velocity of +6 km/s. [4]
This object has a stellar classification of A0IVn, [3] matching an A-type subgiant star with "nebulous" lines due to rapid rotation. It is spinning with a projected rotational velocity of 196 km/s, [8] which is giving the star an equatorial bulge that is an estimated 16% larger than the polar radius. [11] Unusually for a star of this type, spectra show weak emission features among the Hydrogen lines, which may be due to plage regions on the surface caused by an implied magnetic field. [12] The star is 345 [9] million years old and is radiating 348 [5] times the luminosity of the Sun from its photosphere at an effective temperature of 10,585 K. [7]
In Chinese astronomy, Lambda Persei is called 積水, Pinyin: Jīshuǐ, meaning Stored Water, because this star is marking itself and stand alone in Stored Water asterism, Stomach mansion (see : Chinese constellation). [13]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 04h 06m 35.04360s [1] |
Declination | 50° 21′ 04.5500″ [1] |
Apparent magnitude (V) | 4.29 [2] |
Characteristics | |
Spectral type | A0IVn [3] |
U−B color index | −0.04 [2] |
B−V color index | +0.02 [2] |
Astrometry | |
Radial velocity (Rv) | +6.1±2.0 [4] km/s |
Proper motion (μ) |
RA: −12.75
[1]
mas/
yr Dec.: −35.60 [1] mas/ yr |
Parallax (π) | 7.73 ± 0.22 mas [1] |
Distance | 420 ± 10
ly (129 ± 4 pc) |
Absolute magnitude (MV) | −1.31 [5] |
Details | |
Radius | 3.1 [6] R☉ |
Luminosity | 348 [5] L☉ |
Surface gravity (log g) | 4.05 [7] cgs |
Temperature | 10,585 [7] K |
Metallicity [Fe/H] | +0.01 [7] dex |
Rotational velocity (v sin i) | 196 [8] km/s |
Age | 345 [9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
λ Persei, Latinized as Lambda Persei, is a star in the northern constellation of Perseus. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.29. [2] This object is located approximately 422 light years from the Sun based on parallax, [1] and is drifting further away with a radial velocity of +6 km/s. [4]
This object has a stellar classification of A0IVn, [3] matching an A-type subgiant star with "nebulous" lines due to rapid rotation. It is spinning with a projected rotational velocity of 196 km/s, [8] which is giving the star an equatorial bulge that is an estimated 16% larger than the polar radius. [11] Unusually for a star of this type, spectra show weak emission features among the Hydrogen lines, which may be due to plage regions on the surface caused by an implied magnetic field. [12] The star is 345 [9] million years old and is radiating 348 [5] times the luminosity of the Sun from its photosphere at an effective temperature of 10,585 K. [7]
In Chinese astronomy, Lambda Persei is called 積水, Pinyin: Jīshuǐ, meaning Stored Water, because this star is marking itself and stand alone in Stored Water asterism, Stomach mansion (see : Chinese constellation). [13]