Beta Sextantis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sextans |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.07[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | B6 V[5] or B5 IV/V[6] |
| U−B Template:Engvar | −0.51[3] |
| B−V Template:Engvar | −0.14[3] |
| Variable type | α2 CVn[7] |
| Astrometry | |
| Radial velocity (Rv) | Template:Val[8] km/s |
| Proper motion (μ) | RA: −38.805[2] mas/yr Dec.: −24.290[2] mas/yr |
| Parallax (π) | 8.9613±0.2448 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.38[9] |
| Details | |
| Mass | 4.0[4] Template:Solar mass |
| Radius | 3.2[10] Template:Solar radius |
| Luminosity | 184[11] Template:Solar luminosity |
| Surface gravity (log g) | 4.21[12] cgs |
| Temperature | 14,570[12] K |
| Metallicity [Fe/H] | 0.19[12] dex |
| Rotational velocity (v sin i) | Template:Val[12] km/s |
| Age | 216[13] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[14] | |
| Database references | |
| SIMBAD | data |
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Beta Sextantis, Latinized from β Sextantis, is a variable star in the equatorial constellation of Sextans. With an apparent visual magnitude of 5.07,[3] it is faintly visible to the naked eye on a dark night. According to the Bortle scale, it can be viewed from brighter lit suburban skies. The distance to this star, based upon an annual parallax shift of 8.96 mas,[2] is around 364 light years.
This star served as a primary standard in the MK spectral classification system with a stellar classification of B6 V,[5] indicating that it is a B-type main sequence star. However, Houk and Swift (1999) list a classification of B5 IV/V, suggesting it may be transitioning into a subgiant star.[6] It has served as a uvby photometric standard, but is also categorized as an Alpha2 Canum Venaticorum variable[7] with a suspected period of 15.4 days. This lengthy a period conflicts with a relatively high projected rotational velocity of 85 km/s, leaving the explanation for the variance unresolved.[12][5]
References
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