Lacaille 9352

Coordinates: 23^h 05^m 52.03604^s, −35° 51′ 11.0475″

Lacaille 9352

the neighborhood of the solar system which also includes 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: +6,765.995[6] mas/yr Dec.: +1,330.388[6] mas/yr
Parallax (π)	304.1354 ± 0.0200[7] mas
Distance	10.7241 ± 0.0007 ly (3.2880 ± 0.0002 pc)
Absolute magnitude (MV)	9.8[8]
Details
Mass	0.486 ± 0.012[9] M☉
Radius	0.470 ± 0.001[9] R☉
Luminosity	0.0367±0.0022[9] L☉
Surface gravity (log g)	4.78[9] cgs
Temperature	3,692±57[9] K
Metallicity [Fe/H]	−0.22 ± 0.09[10] dex
Rotational velocity (v sin i)	1[5] km/s
Age	4.57[11] Gyr
Other designations
HD 217987, CD-36°15693, GCTP 5584, GJ 887, LHS 70, SAO 214301, LTT 9348, LFT 1758, Cordoba 31353, NSV 14420, HIP 114046, UGPMF 591[12]
Database references
SIMBAD	data
ARICNS	data
Lacaille 9352 Location of Lacaille 9352 in the constellation Piscis Austrinus

Lacaille 9352 (Lac 9352) is a red dwarf 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 except possibly 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^[13] and is the closest star in the constellation Piscis Austrinus. The ChView simulation^[14] shows that its closest neighbour is the EZ Aquarii triple star system at about 4.1 ly away.

Properties[]

This star has the fourth highest known proper motion,^[15] (which was first noticed by Benjamin Gould in 1881^[16]) 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.^[17] If the radial velocity (V_r) 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.^[18]

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,^[19] 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]

Planetary system[]

In June 2020 two super-Earth planets were reported, as well as a third signal with a period of 50.7 days that may be due to stellar activity—however, were this planet real it may be located within the habitable zone. They were detected using the radial velocity method from observations with HARPS in Chile and HIRES in Hawaii.^[20][21]