Lacaille 9352
Star
Lacaille 9352 — one of the closest and brightest red dwarfs, 10.7 light-years away in Piscis Austrinus. An M1V star about half the Sun's mass, it is unusually magnetically QUIET for a red dwarf, and it hosts a compact family of four confirmed planets found from its radial-velocity wobble.
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Key facts
Mass
9.85 × 10²⁹ kg
0.495 M☉
Radius
325,588 km
47% of the Sun's radius
Surface temperature
3,688 K (3,415 °C)
Luminosity
1.41 × 10²⁵ W
Spectral type
M1V (red dwarf)
Science
Physical
- Mass
- 9.85 × 10²⁹ kg · 0.495 M☉
- Radius
- 325,588 km · 47% of the Sun's radius
- Density
- 6,810 kg/m³ · 6.8× water
- Computed from mass and radius
- Spectral type
- M1V (red dwarf)
Motion through space
- Proper motion
- 6.9 arcseconds per year · its drift across our sky
- SIMBAD — 2020yCat.1350....0G, 2018A&A...616A...7S
- Radial velocity
- +8.8 km/s · moving away from the Sun
- SIMBAD — 2020yCat.1350....0G, 2018A&A...616A...7S
- Speed across our line of sight
- 107 km/s
- Computed from proper motion and parallax
- Speed through space, relative to the Sun
- 108 km/s
- Computed from proper motion, parallax and radial velocity
Rotation
- Note
- Rotates slowly (tens of days) and flares little — quiet for a red dwarf.
Composition
- By mass
- A red dwarf about half the Sun's mass — one of the brightest and closest of its type. It is notably quiet magnetically, which helped make its four small planets detectable in the star's radial velocity.
Temperature
- Surface
- 3,688 K (3,415 °C)
Radiation & temperature
- Luminosity
- 1.41 × 10²⁵ W · 0.0368 L☉
- Surface temperature
- 3,688 K (3,415 °C)
- Peak wavelength
- 786 nm · near-infrared (mostly invisible to the eye)
- Computed (Wien's law) from the surface temperature
Discovery & history
- Discovered
- 1763
- By
- Nicolas-Louis de Lacaille
- Method
- Telescope
- Name
- Named for the French astronomer Nicolas-Louis de Lacaille and its number in his 1763 southern-sky catalogue. It is also GJ 887.
Recorded by Nicolas-Louis de Lacaille in his catalogue of southern stars (published 1763), as entry 9352. It has the sixth-largest proper motion of any star. In 2020 the RedDots/HARPS team announced two planets (b, c); two more (d, e) were confirmed in 2026 by Hartogh et al.
Images
Images from open archives · credit shown per image