B3 Hydrae
Multiple star system in the constellation Hydra
From Wikipedia, the free encyclopedia
b3 Hydrae (6 Crateris) is a star in the constellation Hydra at a distance of approximately 98 light-years (about 30 parsecs) from the Sun. It has three optical companions, which are background stars located much farther away.
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Hydra[1] |
| Right ascension | 10h 53m 29.532s[2] |
| Declination | −20° 08′ 19.43″[2] |
| Apparent magnitude (V) | 5.24[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F5V[3] |
| U−B color index | +0.06[3] |
| B−V color index | +0.47[3] |
| Astrometry | |
| Radial velocity (Rv) | −4.08±0.12[2] km/s |
| Proper motion (μ) | RA: +80.915[2] mas/yr Dec.: −238.566[2] mas/yr |
| Parallax (π) | 33.2327±0.1234 mas[2] |
| Distance | 98.1 ± 0.4 ly (30.1 ± 0.1 pc) |
| Absolute magnitude (MV) | +2.79[1] |
| Details | |
| Mass | 1.48[4] M☉ |
| Radius | 1.93[5] R☉ |
| Luminosity | 6.02[5] L☉ |
| Surface gravity (log g) | 3.99[5] cgs |
| Temperature | 6,505[5] K |
| Metallicity [Fe/H] | +0.09[4] dex |
| Rotation | 27.1 days[6] |
| Rotational velocity (v sin i) | 6.0[7] km/s |
| Age | 2.27[4] Gyr |
| Other designations | |
| b3 Hya, 6 Crt, HD 94388, HIP 53252, HR 4521, SAO 156301, PPM 258261, CCDM J10534-2009A, WDS J10535-2008A[8] | |
| Database references | |
| SIMBAD | data |
Description
b3 Hydrae (WDS J10535-2008A) is a yellow-white main sequence star with the spectral type of F5V. The apparent magnitude of the star is +5.232. It has about 1.5 M☉, its radius is about 1.9 R☉ and the luminosity is about 6.0 L☉. The age of the star is determined to be about 1.647 billion years.[4] The effective temperature is about 6,505 K.
Optical companions
BD−19 3124
The secondary (BD−19 3124) is a yellow main sequence star of spectral type G5.[9] The apparent magnitude of the star is +9.6.[10] The mass is about 1.492 ± 0.001 M☉[11], the radius is about 2.071 ± 0.008 R☉[11], the luminosity is about 6.946 ± 0.001 L☉[11]. The effective temperature is about 6,566±1 K[11]. It is 119.6 arcseconds away from b3 Hydrae[12] and about 774 light-years (237 parsecs) away from the Solar System.[11]
UCAC2 23866861
The third component (UCAC2 23866861) is a yellow dwarf of spectral type G.[citation needed] The apparent magnitude of the star is +11.6.[13] The mass is about 0.989 ± 0.001 M☉[14], the radius is about 1.315 ± 0.002 R☉[14], the luminosity is about 1.662 ± 0.001 L☉[14]. The effective temperature is about 5,761±4 K[14]. It is separated from BD−19 3124 by 13.7 arc seconds[12] and is about 850 light-years (260 parsecs) away from the Solar System.[14]
UCAC2 23866855
The fourth component (UCAC2 23866855) is a yellow-white star of spectral type F.[citation needed] The apparent magnitude of the star is +13.5.[15] The mass is about 1.332 ± 0.001 M☉[16] the radius is about 1.829 ± 0.005 R☉[16] the luminosity is about 4.356 ± 0.001 L☉[16] the effective temperature is about 6,236±1 K[16]. It is located 40.5 arc seconds away from BD−19 3124[12] and is about 3,820 light-years (1,170 parsecs) away from the Solar System.[16]