Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Crux |
Right ascension | 12h 03m 01.50130s [1] |
Declination | −63° 18′ 46.5406″ [1] |
Apparent magnitude (V) | 4.30 [2] |
Characteristics | |
Spectral type | A3(m)A8-A8 [3] |
U−B color index | +0.03 [2] |
B−V color index | +0.28 [2] |
Astrometry | |
Radial velocity (Rv) | −2.4 [4] km/s |
Proper motion (μ) |
RA: −152.35
[1]
mas/
yr Dec.: +7.00 [1] mas/ yr |
Parallax (π) | 13.88 ± 0.15 mas [1] |
Distance | 235 ± 3
ly (72.0 ± 0.8 pc) |
Absolute magnitude (MV) | +1.29 [5] |
Orbit [6] | |
Period (P) | 24.4828 d |
Eccentricity (e) | 0.61 |
Periastron epoch (T) | 2419453.3470 JD |
Argument of periastron (ω) (secondary) | 358.9° |
Semi-amplitude (K1) (primary) | 46.1 km/s |
Semi-amplitude (K2) (secondary) | 56.1 km/s |
Details | |
Mass | 1.57 [7] M☉ |
Luminosity | 81 [8] L☉ |
Surface gravity (log g) | 3.76 [7] cgs |
Temperature | 7341±250 [7] K |
Age | 1.1 [7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Theta1 Crucis (θ1 Cru, Theta1 Crucis) is a spectroscopic binary star system in the southern constellation of Crux. It is visible to the naked eye with an apparent visual magnitude of 4.30m. [2] The distance to this star, as determined using parallax measurements, [1] is around 235 light years.
The pair orbit each other closely with a period of 24.5 days and an eccentricity of 0.61. [6] The primary component is an Am star, which is a chemically peculiar A-type star that shows anomalous variations in absorption lines of certain elements. [10] It has a stellar classification of A3(m)A8-A8. [3] With a mass 157% times that of the Sun, [7] it radiates 81 [8] times the Sun's luminosity from its outer atmosphere at an effective temperature of 7341 K. [7] Unusually for a fully radiative A-type star, X-ray emissions have been detected, which may instead be coming from the orbiting companion. [11]
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cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Crux |
Right ascension | 12h 03m 01.50130s [1] |
Declination | −63° 18′ 46.5406″ [1] |
Apparent magnitude (V) | 4.30 [2] |
Characteristics | |
Spectral type | A3(m)A8-A8 [3] |
U−B color index | +0.03 [2] |
B−V color index | +0.28 [2] |
Astrometry | |
Radial velocity (Rv) | −2.4 [4] km/s |
Proper motion (μ) |
RA: −152.35
[1]
mas/
yr Dec.: +7.00 [1] mas/ yr |
Parallax (π) | 13.88 ± 0.15 mas [1] |
Distance | 235 ± 3
ly (72.0 ± 0.8 pc) |
Absolute magnitude (MV) | +1.29 [5] |
Orbit [6] | |
Period (P) | 24.4828 d |
Eccentricity (e) | 0.61 |
Periastron epoch (T) | 2419453.3470 JD |
Argument of periastron (ω) (secondary) | 358.9° |
Semi-amplitude (K1) (primary) | 46.1 km/s |
Semi-amplitude (K2) (secondary) | 56.1 km/s |
Details | |
Mass | 1.57 [7] M☉ |
Luminosity | 81 [8] L☉ |
Surface gravity (log g) | 3.76 [7] cgs |
Temperature | 7341±250 [7] K |
Age | 1.1 [7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Theta1 Crucis (θ1 Cru, Theta1 Crucis) is a spectroscopic binary star system in the southern constellation of Crux. It is visible to the naked eye with an apparent visual magnitude of 4.30m. [2] The distance to this star, as determined using parallax measurements, [1] is around 235 light years.
The pair orbit each other closely with a period of 24.5 days and an eccentricity of 0.61. [6] The primary component is an Am star, which is a chemically peculiar A-type star that shows anomalous variations in absorption lines of certain elements. [10] It has a stellar classification of A3(m)A8-A8. [3] With a mass 157% times that of the Sun, [7] it radiates 81 [8] times the Sun's luminosity from its outer atmosphere at an effective temperature of 7341 K. [7] Unusually for a fully radiative A-type star, X-ray emissions have been detected, which may instead be coming from the orbiting companion. [11]
{{
cite web}}
: CS1 maint: postscript (
link)