Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Eridanus |
Right ascension | 03h 47m 39.65058s [1] |
Declination | −23° 52′ 28.8352″ [1] |
Apparent magnitude (V) | 5.235 [2] |
Characteristics | |
Spectral type | A3 Vs [3] |
U−B color index | +0.168 [2] |
B−V color index | +0.067 [2] |
Astrometry | |
Radial velocity (Rv) | 28.4±0.5 [4] km/s |
Proper motion (μ) |
RA: +47.46
[1]
mas/
yr Dec.: +49.10 [1] mas/ yr |
Parallax (π) | 13.00 ± 0.28 mas [1] |
Distance | 251 ± 5
ly (77 ± 2 pc) |
Absolute magnitude (MV) | +0.81 [5] |
Details | |
τ7 Eri A | |
Mass | 2.03 [6] M☉ |
Luminosity | 37.6 [7] L☉ |
Surface gravity (log g) | 3.86±0.2 [8] cgs |
Temperature | 8,740±200 [8] K |
Rotational velocity (v sin i) | 18 [8] km/s |
Age | 387 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Tau7 Eridani is a solitary star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 5.235. [2] Using the parallax method, the distance to this star can be estimated as around 251 light years. [1]
This is an A-type main sequence star with a stellar classification of A3 Vs, [3] where the 's' indicates it has narrow absorption lines. It may be a chemically peculiar Am star, which means it displays unusual abundances of certain elements in its surface layers. Tau7 Eridani appears to be a low amplitude variable that displays slight fluctuations in luminosity over a period of 7.17 days. It is slowly rotating with a projected rotational velocity of 18 km/s, [8] and is around 387 million years old. [6]
{{
cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Eridanus |
Right ascension | 03h 47m 39.65058s [1] |
Declination | −23° 52′ 28.8352″ [1] |
Apparent magnitude (V) | 5.235 [2] |
Characteristics | |
Spectral type | A3 Vs [3] |
U−B color index | +0.168 [2] |
B−V color index | +0.067 [2] |
Astrometry | |
Radial velocity (Rv) | 28.4±0.5 [4] km/s |
Proper motion (μ) |
RA: +47.46
[1]
mas/
yr Dec.: +49.10 [1] mas/ yr |
Parallax (π) | 13.00 ± 0.28 mas [1] |
Distance | 251 ± 5
ly (77 ± 2 pc) |
Absolute magnitude (MV) | +0.81 [5] |
Details | |
τ7 Eri A | |
Mass | 2.03 [6] M☉ |
Luminosity | 37.6 [7] L☉ |
Surface gravity (log g) | 3.86±0.2 [8] cgs |
Temperature | 8,740±200 [8] K |
Rotational velocity (v sin i) | 18 [8] km/s |
Age | 387 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Tau7 Eridani is a solitary star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 5.235. [2] Using the parallax method, the distance to this star can be estimated as around 251 light years. [1]
This is an A-type main sequence star with a stellar classification of A3 Vs, [3] where the 's' indicates it has narrow absorption lines. It may be a chemically peculiar Am star, which means it displays unusual abundances of certain elements in its surface layers. Tau7 Eridani appears to be a low amplitude variable that displays slight fluctuations in luminosity over a period of 7.17 days. It is slowly rotating with a projected rotational velocity of 18 km/s, [8] and is around 387 million years old. [6]
{{
cite web}}
: CS1 maint: postscript (
link)