Lacaille 9352
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | 23h 05m 52.03604s[1] |
| Declination | −35° 51′ 11.0475″[1] |
| Apparent magnitude (V) | 7.34[2] |
| Characteristics | |
| Spectral type | M0.5V[3] |
| U−B color index | +1.18[2] |
| B−V color index | +1.50[2] |
| Variable type | Suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | +9.7[5] km/s |
| Proper motion (μ) | RA: +6,768.20[1] mas/yr Dec.: +1,327.52[1] mas/yr |
| Parallax (π) | 305.26 ± 0.70[1] mas |
| Distance | 10.68 ± 0.02 ly (3.276 ± 0.008 pc) |
| Absolute magnitude (MV) | 9.8[6] |
| Details | |
| Mass | 0.503 ± 0.025[3] M☉ |
| Radius | 0.459 ± 0.011[3] R☉ |
| Luminosity (bolometric) | 0.033[note 1] L☉ |
| Temperature | 3,626[3] K |
| Metallicity [Fe/H] | −0.22 ± 0.09[7] dex |
| Rotational velocity (v sin i) | 1[5] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Lacaille 9352 (Lac 9352) is a star in the southern constellation of Piscis Austrinus. With an apparent visual magnitude of 7.34,[2] this star is too faint to be viewed with the naked eye even under excellent seeing conditions. Parallax measurements place it at a distance of about 10.74 light-years (3.29 parsecs) from Earth.[1] It is the eleventh closest star system to the Solar System[9] and is the closest star in the constellation Piscis Austrinus. The ChView simulation[10] shows that its closest neighbour is the EZ Aquarii triple star system at about 4.1 ly from Lacaille 9352.
Properties
This star has the fourth highest known proper motion,[11] (which was first noticed by Benjamin Gould in 1881[12]) moving a total of 6.9 arcseconds per year. However, this is still a very small movement overall, as there are 3,600 arcseconds in a degree of arc. The space velocity components of this star are (U, V, W) = (−93.9, −14.1, −51.4) km/s.[13] If the radial velocity (Vr) equals +9.7 km/s then about 2,700 years ago Lacaille 9352 was at its minimal distance of approximately 10.63 ly (3.26 pc) from the Sun.[14]
The spectrum of Lacaille 9352 places it at a stellar classification of M0.5V,[3] indicating it is a type of main sequence star known as a red dwarf. This was the first red dwarf star to have its angular diameter measured,[15] with the physical diameter being about 46% of the Sun's radius.[3] It has around half the mass of the Sun[3] and the outer envelope has an effective temperature of about 3,626 K.[3]
See also
Notes
- ↑ From L=4πR2σTeff4, where L is the luminosity, R is the radius, Teff is the effective surface temperature and σ is the Stefan–Boltzmann constant.
References
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