Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Fornax |
Right ascension | 03h 25m 55.84196s [1] |
Declination | −35° 55′ 15.1876″ [1] |
Apparent magnitude (V) | 6.39±0.01 [2] |
Characteristics | |
Evolutionary stage | main sequence star [3] |
Spectral type | A1 IV [4] |
B−V color index | +0.08 [5] |
Astrometry | |
Radial velocity (Rv) | 19.0±0.5 [6] km/s |
Proper motion (μ) |
RA: +36.770
mas/
yr
[1] Dec.: −4.641 mas/ yr [1] |
Parallax (π) | 9.6154 ± 0.0266 mas [1] |
Distance | 339.2 ± 0.9
ly (104.0 ± 0.3 pc) |
Absolute magnitude (MV) | +1.42 [7] |
Details | |
Mass | 2.05±0.08 [8] M☉ |
Radius | 2.20±0.11 [9] R☉ |
Luminosity | 31.24+3.43 −3.09 [3] L☉ |
Surface gravity (log g) | 4.08±0.07 [10] cgs |
Temperature | 8,770+122 −120 [3] K |
Metallicity [Fe/H] | 0.00+0.02 −0.04 [8] dex |
Rotational velocity (v sin i) | 136 [11] km/s |
Age | 5.5±0.5 [12] Myr |
Other designations | |
Database references | |
SIMBAD | For data |
Chi1 Fornacis, Latinised from χ1 Fornacis is a solitary white-hued star located in the southern constellation Fornax. Its barley visible to the naked eye with an apparent magnitude of 6.39, [2] which is near the limit for naked eye visibility. Gaia DR3 parallax measurements imply a distance of 339 light-years [1] and it is currently drifitng away with a heliocentric radial velocity of 19.0 km/s. [6] At its current distance, Chi1 Fornacis' brightness is diminshed by an interstellar extinction of 0.08 magnitudes [15] and it has an absolute magnitude of +1.42. [7]
Chi1 Fornacis has a stellar classification of A1 IV, [4] indicating that it is a slightly evolved A-type star that is ceasing hydrogen fusion at its core. Alternatively, it has been given a class of A1 Vbn, [16] indicating that it is instead a slightly less luminous A-type main-sequence star with broad or nebulous absorption lines due to rapid rotation. It has 2.05 times the mass of the Sun [8] and 2.20 times the radius of the Sun. [9] It radiates 31.24 times the luminosity of the Sun from its photosphere at an effective temperature of 8,870 K. [3] Chi1 Fornacis has a solar metallicity [8] and it is estimated to be only 5.5 million years old. [12] It spins rapidly with a projected rotational velocity of 136 km/s. [11]
It is the brightest star and titular member in the χ1 Fornacis cluster, a star cluster around 104 parsecs from Earth. [17]
The χ1 Fornacis cluster, or Alessi 13, [18] is one of the four star clusters known within 110 parsecs from Earth. [17] Despite its closeness, the χ1 Fornacis cluster has barely been studied. Its age is 40 million years and its distance is 104 parsecs. [17] The χ1 Fornacis cluster appears to be closely related to the Tucana–Horologium and Columba associations. [17] A remarkable, unprecedented aspect of the cluster is the large percentage of M-type stars with warm excess infrared emission due to orbiting dust grains. [17]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Fornax |
Right ascension | 03h 25m 55.84196s [1] |
Declination | −35° 55′ 15.1876″ [1] |
Apparent magnitude (V) | 6.39±0.01 [2] |
Characteristics | |
Evolutionary stage | main sequence star [3] |
Spectral type | A1 IV [4] |
B−V color index | +0.08 [5] |
Astrometry | |
Radial velocity (Rv) | 19.0±0.5 [6] km/s |
Proper motion (μ) |
RA: +36.770
mas/
yr
[1] Dec.: −4.641 mas/ yr [1] |
Parallax (π) | 9.6154 ± 0.0266 mas [1] |
Distance | 339.2 ± 0.9
ly (104.0 ± 0.3 pc) |
Absolute magnitude (MV) | +1.42 [7] |
Details | |
Mass | 2.05±0.08 [8] M☉ |
Radius | 2.20±0.11 [9] R☉ |
Luminosity | 31.24+3.43 −3.09 [3] L☉ |
Surface gravity (log g) | 4.08±0.07 [10] cgs |
Temperature | 8,770+122 −120 [3] K |
Metallicity [Fe/H] | 0.00+0.02 −0.04 [8] dex |
Rotational velocity (v sin i) | 136 [11] km/s |
Age | 5.5±0.5 [12] Myr |
Other designations | |
Database references | |
SIMBAD | For data |
Chi1 Fornacis, Latinised from χ1 Fornacis is a solitary white-hued star located in the southern constellation Fornax. Its barley visible to the naked eye with an apparent magnitude of 6.39, [2] which is near the limit for naked eye visibility. Gaia DR3 parallax measurements imply a distance of 339 light-years [1] and it is currently drifitng away with a heliocentric radial velocity of 19.0 km/s. [6] At its current distance, Chi1 Fornacis' brightness is diminshed by an interstellar extinction of 0.08 magnitudes [15] and it has an absolute magnitude of +1.42. [7]
Chi1 Fornacis has a stellar classification of A1 IV, [4] indicating that it is a slightly evolved A-type star that is ceasing hydrogen fusion at its core. Alternatively, it has been given a class of A1 Vbn, [16] indicating that it is instead a slightly less luminous A-type main-sequence star with broad or nebulous absorption lines due to rapid rotation. It has 2.05 times the mass of the Sun [8] and 2.20 times the radius of the Sun. [9] It radiates 31.24 times the luminosity of the Sun from its photosphere at an effective temperature of 8,870 K. [3] Chi1 Fornacis has a solar metallicity [8] and it is estimated to be only 5.5 million years old. [12] It spins rapidly with a projected rotational velocity of 136 km/s. [11]
It is the brightest star and titular member in the χ1 Fornacis cluster, a star cluster around 104 parsecs from Earth. [17]
The χ1 Fornacis cluster, or Alessi 13, [18] is one of the four star clusters known within 110 parsecs from Earth. [17] Despite its closeness, the χ1 Fornacis cluster has barely been studied. Its age is 40 million years and its distance is 104 parsecs. [17] The χ1 Fornacis cluster appears to be closely related to the Tucana–Horologium and Columba associations. [17] A remarkable, unprecedented aspect of the cluster is the large percentage of M-type stars with warm excess infrared emission due to orbiting dust grains. [17]