Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Antlia |
Right ascension | 10h 42m 43.1844s [1] |
Declination | −32° 42′ 56.413″ [1] |
Apparent magnitude (V) | 5.62±0.01 [2] |
Characteristics | |
Evolutionary stage | subgiant [3] |
Spectral type | A0 V [4] |
B−V color index | +0.00 [5] |
Astrometry | |
Radial velocity (Rv) | 4.5±0.5 [6] km/s |
Proper motion (μ) |
RA: −28.903
mas/
yr
[1] Dec.: +1.262 mas/ yr [1] |
Parallax (π) | 4.1113 ± 0.2655 mas [1] |
Distance | 790 ± 50
ly (240 ± 20 pc) |
Absolute magnitude (MV) | −0.67 [7] |
Details | |
Mass | 3.1±0.1 [3] M☉ |
Radius | 5.31 [8] R☉ |
Luminosity | 206+72 −53 [3] L☉ |
Surface gravity (log g) | 3.5 [9] cgs |
Temperature | 9,376±109 [8] K |
Metallicity [Fe/H] | 0.00 [10] dex |
Rotational velocity (v sin i) | 81±3 [11] km/s |
Age | 282±34 [12] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 92845 (HR 4194) is a probable astrometric binary [15] in the southern constellation Antlia. It has an apparent magnitude of 5.62, allowing it to be faintly seen with the naked eye. Parallax measurements place the system at a distance of 790 light years and it is currently receding with a heliocentric radial velocity of 4.5 km/s.
HD 92845 has a stellar classification of A0 V, [4] indicating that it is an ordinary A-type main-sequence star. However, stellar evolution models from Zorec and Royer reveal it to be a subgiant that has just left the main sequence. [3] It has 3.1 times the mass of the Sun [3] but has expanded to an enlarged radius of 5.31 R☉. [8] It radiates with a luminosity 206 times greater than the Sun [3] from its photosphere at an effective temperature of 9,376 K, [8] giving a white hue. At an age of 282 million years, [12] HD 92845 spins quickly with a projected rotational velocity of 81 km/s. [11]
There is an optical companion 17 ″ away along a position angle of 214 ° as of 1999. [16]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Antlia |
Right ascension | 10h 42m 43.1844s [1] |
Declination | −32° 42′ 56.413″ [1] |
Apparent magnitude (V) | 5.62±0.01 [2] |
Characteristics | |
Evolutionary stage | subgiant [3] |
Spectral type | A0 V [4] |
B−V color index | +0.00 [5] |
Astrometry | |
Radial velocity (Rv) | 4.5±0.5 [6] km/s |
Proper motion (μ) |
RA: −28.903
mas/
yr
[1] Dec.: +1.262 mas/ yr [1] |
Parallax (π) | 4.1113 ± 0.2655 mas [1] |
Distance | 790 ± 50
ly (240 ± 20 pc) |
Absolute magnitude (MV) | −0.67 [7] |
Details | |
Mass | 3.1±0.1 [3] M☉ |
Radius | 5.31 [8] R☉ |
Luminosity | 206+72 −53 [3] L☉ |
Surface gravity (log g) | 3.5 [9] cgs |
Temperature | 9,376±109 [8] K |
Metallicity [Fe/H] | 0.00 [10] dex |
Rotational velocity (v sin i) | 81±3 [11] km/s |
Age | 282±34 [12] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 92845 (HR 4194) is a probable astrometric binary [15] in the southern constellation Antlia. It has an apparent magnitude of 5.62, allowing it to be faintly seen with the naked eye. Parallax measurements place the system at a distance of 790 light years and it is currently receding with a heliocentric radial velocity of 4.5 km/s.
HD 92845 has a stellar classification of A0 V, [4] indicating that it is an ordinary A-type main-sequence star. However, stellar evolution models from Zorec and Royer reveal it to be a subgiant that has just left the main sequence. [3] It has 3.1 times the mass of the Sun [3] but has expanded to an enlarged radius of 5.31 R☉. [8] It radiates with a luminosity 206 times greater than the Sun [3] from its photosphere at an effective temperature of 9,376 K, [8] giving a white hue. At an age of 282 million years, [12] HD 92845 spins quickly with a projected rotational velocity of 81 km/s. [11]
There is an optical companion 17 ″ away along a position angle of 214 ° as of 1999. [16]