Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Indus |
Right ascension | 20h 44m 02.33404s [1] |
Declination | −51° 55′ 15.4970″ [1] |
Apparent magnitude (V) | 4.52 [2] |
Characteristics | |
Spectral type | A9IV [3] |
B−V color index | +0.26 [2] |
Astrometry | |
Radial velocity (Rv) | −1.6±0.8 [4] km/s |
Proper motion (μ) |
RA: +155.80
[1]
mas/
yr Dec.: −53.86 [1] mas/ yr |
Parallax (π) | 41.37 ± 0.25 mas [1] |
Distance | 78.8 ± 0.5
ly (24.2 ± 0.1 pc) |
Absolute magnitude (MV) | 2.59 [5] |
Details | |
Mass | 1.60 [6] M☉ |
Radius | 2.27 [7] R☉ |
Luminosity | 7.60 [5] L☉ |
Temperature | 7,694 [6] K |
Rotational velocity (v sin i) | 75 [8] km/s |
Age | 100±50 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Eta Indi, Latinised from η Indi, is a single, white-hued star in the southern constellation Indus. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.52. [2]
Measurements with the Hipparcos spacecraft showed the star, which is single, [9] appears to move against the deep sky backdrop by a mean biannual parallax shift of around 41.37 mas, [1] which equates to 79 light-years' distance. Its radial vector to our system's own trajectory ( radial velocity) shows it to be in a phase of a narrowing of the gap, at a rounded −2 km/s, net. [4] η Indi appears to be a member of the Octans association, a group of 62 stars that are around 30−50 million years old and have common motion. [10]
The spectrum of this star matches a stellar classification of A9 IV [3] which suggests it is an evolving subgiant star of type A. The star is estimated 1.6 M☉ ( masses of the Sun), [6] and 2.27 R☉ ( its radius). [7] It is shines with 7.60 [5] times the Sun's luminosity, which is radiated from its photosphere at an effective temperature of 7,694 K. [6] The star is spinning with a projected rotational velocity of 75 km/s. [8] It is very likely to be a hybrid Delta Scuti/ Gamma Doradus variable. [8]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Indus |
Right ascension | 20h 44m 02.33404s [1] |
Declination | −51° 55′ 15.4970″ [1] |
Apparent magnitude (V) | 4.52 [2] |
Characteristics | |
Spectral type | A9IV [3] |
B−V color index | +0.26 [2] |
Astrometry | |
Radial velocity (Rv) | −1.6±0.8 [4] km/s |
Proper motion (μ) |
RA: +155.80
[1]
mas/
yr Dec.: −53.86 [1] mas/ yr |
Parallax (π) | 41.37 ± 0.25 mas [1] |
Distance | 78.8 ± 0.5
ly (24.2 ± 0.1 pc) |
Absolute magnitude (MV) | 2.59 [5] |
Details | |
Mass | 1.60 [6] M☉ |
Radius | 2.27 [7] R☉ |
Luminosity | 7.60 [5] L☉ |
Temperature | 7,694 [6] K |
Rotational velocity (v sin i) | 75 [8] km/s |
Age | 100±50 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Eta Indi, Latinised from η Indi, is a single, white-hued star in the southern constellation Indus. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.52. [2]
Measurements with the Hipparcos spacecraft showed the star, which is single, [9] appears to move against the deep sky backdrop by a mean biannual parallax shift of around 41.37 mas, [1] which equates to 79 light-years' distance. Its radial vector to our system's own trajectory ( radial velocity) shows it to be in a phase of a narrowing of the gap, at a rounded −2 km/s, net. [4] η Indi appears to be a member of the Octans association, a group of 62 stars that are around 30−50 million years old and have common motion. [10]
The spectrum of this star matches a stellar classification of A9 IV [3] which suggests it is an evolving subgiant star of type A. The star is estimated 1.6 M☉ ( masses of the Sun), [6] and 2.27 R☉ ( its radius). [7] It is shines with 7.60 [5] times the Sun's luminosity, which is radiated from its photosphere at an effective temperature of 7,694 K. [6] The star is spinning with a projected rotational velocity of 75 km/s. [8] It is very likely to be a hybrid Delta Scuti/ Gamma Doradus variable. [8]