Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Indus |
Right ascension | 20h 54m 48.60278s [1] |
Declination | −58° 27′ 14.9618″ [1] |
Apparent magnitude (V) | 3.67 [2] |
Characteristics | |
Spectral type | K1II [3] or K0III [4] |
U−B color index | +1.23 [5] |
B−V color index | +1.250±0.015 [2] |
Astrometry | |
Radial velocity (Rv) | −4.9±0.7 [2] km/s |
Proper motion (μ) |
RA: 21.06
[1]
mas/
yr Dec.: −24.75 [1] mas/ yr |
Parallax (π) | 5.41 ± 0.73 mas [1] |
Distance | approx. 600
ly (approx. 180 pc) |
Absolute magnitude (MV) | −2.664 [6] |
Details | |
Mass | 6.7±0.4 [7] M☉ |
Radius | 55.58+9.35 −5.02 [8] R☉ |
Luminosity | 1,183±58 [8] L☉ |
Surface gravity (log g) | 0.800 [9] cgs |
Temperature | 4,541+220 −334 [8] K |
Metallicity [Fe/H] | −0.06 [9] dex |
Age | 53.2±10.0 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Beta Indi, Latinized from β Indi, is the second brightest star in the southern constellation of Indus. [10] It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 3.67. [2] The star is located approximately 600 light years from the Sun, based on parallax, but is drifting closer with a radial velocity of −5 km/s. [2]
The stellar classification of this star is K1II, [3] matching an evolved bright giant. Earlier it had been categorized as an ordinary giant with a class of K0III. [4] It is a hybrid giant with both a hot stellar corona and cool stellar winds, and is a weak X-ray source with a flux measured at (11±1)×10−14 ergs cm−1 s−1. [11] Having consumed the supply of hydrogen at its core, this star has expanded off the main sequence and now has about 56 [8] times the girth of the Sun. It is 53 million years old with 6.7 times the mass of the Sun. [7] The star is radiating 1,183 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,541 K. [8]
β Indi has a visual companion, CCDM J20548-5827B, with an apparent visual magnitude of approximately 12.5. As of 2015, it lies at an angular separation of 17.2 ″ along a position angle of 100° from the brighter component. [12]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Indus |
Right ascension | 20h 54m 48.60278s [1] |
Declination | −58° 27′ 14.9618″ [1] |
Apparent magnitude (V) | 3.67 [2] |
Characteristics | |
Spectral type | K1II [3] or K0III [4] |
U−B color index | +1.23 [5] |
B−V color index | +1.250±0.015 [2] |
Astrometry | |
Radial velocity (Rv) | −4.9±0.7 [2] km/s |
Proper motion (μ) |
RA: 21.06
[1]
mas/
yr Dec.: −24.75 [1] mas/ yr |
Parallax (π) | 5.41 ± 0.73 mas [1] |
Distance | approx. 600
ly (approx. 180 pc) |
Absolute magnitude (MV) | −2.664 [6] |
Details | |
Mass | 6.7±0.4 [7] M☉ |
Radius | 55.58+9.35 −5.02 [8] R☉ |
Luminosity | 1,183±58 [8] L☉ |
Surface gravity (log g) | 0.800 [9] cgs |
Temperature | 4,541+220 −334 [8] K |
Metallicity [Fe/H] | −0.06 [9] dex |
Age | 53.2±10.0 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Beta Indi, Latinized from β Indi, is the second brightest star in the southern constellation of Indus. [10] It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 3.67. [2] The star is located approximately 600 light years from the Sun, based on parallax, but is drifting closer with a radial velocity of −5 km/s. [2]
The stellar classification of this star is K1II, [3] matching an evolved bright giant. Earlier it had been categorized as an ordinary giant with a class of K0III. [4] It is a hybrid giant with both a hot stellar corona and cool stellar winds, and is a weak X-ray source with a flux measured at (11±1)×10−14 ergs cm−1 s−1. [11] Having consumed the supply of hydrogen at its core, this star has expanded off the main sequence and now has about 56 [8] times the girth of the Sun. It is 53 million years old with 6.7 times the mass of the Sun. [7] The star is radiating 1,183 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,541 K. [8]
β Indi has a visual companion, CCDM J20548-5827B, with an apparent visual magnitude of approximately 12.5. As of 2015, it lies at an angular separation of 17.2 ″ along a position angle of 100° from the brighter component. [12]