Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Eridanus |
Right ascension | 04h 33m 30.55236s [1] |
Declination | −29° 45′ 59.3725″ [1] |
Apparent magnitude (V) | 4.51 [2] |
Characteristics | |
Spectral type | K0 III-IV [3] |
U−B color index | +0.70 [2] |
B−V color index | +0.98 [2] |
Astrometry | |
Radial velocity (Rv) | +20.89±0.69 [4] km/s |
Proper motion (μ) |
RA: −114.78
[1]
mas/
yr Dec.: −271.79 [1] mas/ yr |
Parallax (π) | 25.67 ± 0.24 mas [1] |
Distance | 127 ± 1
ly (39.0 ± 0.4 pc) |
Absolute magnitude (MV) | 1.60 [4] |
Details | |
Mass | 1.54 [4] M☉ |
Radius | 7.3 [5] R☉ |
Luminosity | 24 [4] L☉ |
Surface gravity (log g) | 3.09 [4] cgs |
Temperature | 4,941 [4] K |
Metallicity [Fe/H] | −0.16±0.08 [4] dex |
Rotational velocity (v sin i) | 2.15 [6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Upsilon1 Eridani (υ1 Eri) is a single star in the constellation Eridanus. It has an apparent visual magnitude is 4.51, [2] which is bright enough to be faintly visible to the naked eye on a clear, dark night. The distance to this star, as determined using the parallax method, [1] is around 127 light years.
This is an evolved red clump [8] giant star with a stellar classification of K0III-IV. [3] The measured angular diameter, after correction for limb darkening, is 1.74±0.02 mas. [9] At an estimated distance of this star, this yields a physical size of about 7.3 times the radius of the Sun. [5] It has 154% [4] of the Sun's mass and radiates 24 times the solar luminosity from its outer atmosphere at an effective temperature of 4,941 K. [4]
{{
cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Eridanus |
Right ascension | 04h 33m 30.55236s [1] |
Declination | −29° 45′ 59.3725″ [1] |
Apparent magnitude (V) | 4.51 [2] |
Characteristics | |
Spectral type | K0 III-IV [3] |
U−B color index | +0.70 [2] |
B−V color index | +0.98 [2] |
Astrometry | |
Radial velocity (Rv) | +20.89±0.69 [4] km/s |
Proper motion (μ) |
RA: −114.78
[1]
mas/
yr Dec.: −271.79 [1] mas/ yr |
Parallax (π) | 25.67 ± 0.24 mas [1] |
Distance | 127 ± 1
ly (39.0 ± 0.4 pc) |
Absolute magnitude (MV) | 1.60 [4] |
Details | |
Mass | 1.54 [4] M☉ |
Radius | 7.3 [5] R☉ |
Luminosity | 24 [4] L☉ |
Surface gravity (log g) | 3.09 [4] cgs |
Temperature | 4,941 [4] K |
Metallicity [Fe/H] | −0.16±0.08 [4] dex |
Rotational velocity (v sin i) | 2.15 [6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Upsilon1 Eridani (υ1 Eri) is a single star in the constellation Eridanus. It has an apparent visual magnitude is 4.51, [2] which is bright enough to be faintly visible to the naked eye on a clear, dark night. The distance to this star, as determined using the parallax method, [1] is around 127 light years.
This is an evolved red clump [8] giant star with a stellar classification of K0III-IV. [3] The measured angular diameter, after correction for limb darkening, is 1.74±0.02 mas. [9] At an estimated distance of this star, this yields a physical size of about 7.3 times the radius of the Sun. [5] It has 154% [4] of the Sun's mass and radiates 24 times the solar luminosity from its outer atmosphere at an effective temperature of 4,941 K. [4]
{{
cite web}}
: CS1 maint: postscript (
link)