Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Corona Australis |
Right ascension | 18h 43m 46.94143s [1] |
Declination | −38° 19′ 24.3941″ [1] |
Apparent magnitude (V) | 5.11 [2] + 10.01 [3] |
Characteristics | |
Spectral type | A0/1V [4] + K0 [5] |
B−V color index | +0.075±0.002 [6] |
Astrometry | |
Radial velocity (Rv) | −26.40±4.2 [7] km/s |
Proper motion (μ) |
RA: +1.047
[1]
mas/
yr Dec.: −53.774 [1] mas/ yr |
Parallax (π) | 15.8771 ± 0.2823 mas [1] |
Distance | 205 ± 4
ly (63 ± 1 pc) |
Absolute magnitude (MV) | 1.15 [2] |
Details | |
λ CrA A | |
Mass | 2.17±0.10 [2] M☉ |
Radius | 2.24 [2] R☉ |
Luminosity | 31.25 [6] L☉ |
Surface gravity (log g) | 4.08±0.08 [2] cgs |
Temperature | 8,609 [8] K |
Metallicity [Fe/H] | −0.30 [8] dex |
Rotational velocity (v sin i) | 148.6±1.6 [9] km/s |
Age | 273 [10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
λ Coronae Australis, Latinized as Lambda Coronae Australis is a binary star [5] system located in the southern constellation of Corona Australis. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 5.11. [2] The system is located at a distance of 205 light-years, based on parallax, [1] and is drifting further away with a radial velocity of −26 km/s. [7]
The primary member of this system, designated component A, is an A-type main-sequence star with a stellar classification of A0/1V. [4] It is 273 [10] million years old and is spinning with a projected rotational velocity of 149 km/s. [9] This high rotation rate is producing an equatorial bulge that is 7% larger than the polar radius. [12] It has 2.17 times the mass of the Sun and 2.24 times the Sun's radius. [2] The star is radiating 31 [6] times the Sun's luminosity from its photosphere at an effective temperature of 8,609 K. [8]
The secondary companion, component B, [13] has an apparent visual magnitude of 10.01 [3] and a class of K0. [5] As of 2016, it has an angular separation of 29.5 ″ from the primary along a position angle of 213°. [3] Component C [14] is a visual companion of magnitude 9.9 and separation 43.3″ from the primary. [3]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Corona Australis |
Right ascension | 18h 43m 46.94143s [1] |
Declination | −38° 19′ 24.3941″ [1] |
Apparent magnitude (V) | 5.11 [2] + 10.01 [3] |
Characteristics | |
Spectral type | A0/1V [4] + K0 [5] |
B−V color index | +0.075±0.002 [6] |
Astrometry | |
Radial velocity (Rv) | −26.40±4.2 [7] km/s |
Proper motion (μ) |
RA: +1.047
[1]
mas/
yr Dec.: −53.774 [1] mas/ yr |
Parallax (π) | 15.8771 ± 0.2823 mas [1] |
Distance | 205 ± 4
ly (63 ± 1 pc) |
Absolute magnitude (MV) | 1.15 [2] |
Details | |
λ CrA A | |
Mass | 2.17±0.10 [2] M☉ |
Radius | 2.24 [2] R☉ |
Luminosity | 31.25 [6] L☉ |
Surface gravity (log g) | 4.08±0.08 [2] cgs |
Temperature | 8,609 [8] K |
Metallicity [Fe/H] | −0.30 [8] dex |
Rotational velocity (v sin i) | 148.6±1.6 [9] km/s |
Age | 273 [10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
λ Coronae Australis, Latinized as Lambda Coronae Australis is a binary star [5] system located in the southern constellation of Corona Australis. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 5.11. [2] The system is located at a distance of 205 light-years, based on parallax, [1] and is drifting further away with a radial velocity of −26 km/s. [7]
The primary member of this system, designated component A, is an A-type main-sequence star with a stellar classification of A0/1V. [4] It is 273 [10] million years old and is spinning with a projected rotational velocity of 149 km/s. [9] This high rotation rate is producing an equatorial bulge that is 7% larger than the polar radius. [12] It has 2.17 times the mass of the Sun and 2.24 times the Sun's radius. [2] The star is radiating 31 [6] times the Sun's luminosity from its photosphere at an effective temperature of 8,609 K. [8]
The secondary companion, component B, [13] has an apparent visual magnitude of 10.01 [3] and a class of K0. [5] As of 2016, it has an angular separation of 29.5 ″ from the primary along a position angle of 213°. [3] Component C [14] is a visual companion of magnitude 9.9 and separation 43.3″ from the primary. [3]