LTT 9779
Star
LTT 9779 — a quiet, Sun-like G-type star ~262 light-years away in Sculptor. Ordinary itself, it hosts the most reflective planet known.
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Key facts
Mass
2.03 × 10³⁰ kg
1.02 M☉
Radius
660,219 km
95% of the Sun's radius
Surface temperature
5,443 K (5,170 °C)
Spectral type
G7V (a Sun-like yellow dwarf)
Science
Physical
- Mass
- 2.03 × 10³⁰ kg · 1.02 M☉
- Radius
- 660,219 km · 95% of the Sun's radius
- Density
- 1,683 kg/m³ · 1.7× water
- Computed from mass and radius
- Spectral type
- G7V (a Sun-like yellow dwarf)
Motion through space
- Proper motion
- 0.257 arcseconds per year · its drift across our sky
- SIMBAD — 2020yCat.1350....0G, 2018yCat.1345....0G
- Radial velocity
- -10.6 km/s · approaching the Sun
- SIMBAD — 2020yCat.1350....0G, 2018yCat.1345....0G
- Speed across our line of sight
- 98.8 km/s
- Computed from proper motion and parallax
- Speed through space, relative to the Sun
- 99.4 km/s
- Computed from proper motion, parallax and radial velocity
Composition
- By mass
- A Sun-like star (~1.0 solar masses) in Sculptor; notable only for its mirror-bright planet.
Temperature
- Surface
- 5,443 K (5,170 °C)
Radiation & temperature
- Luminosity
- 2.73 × 10²⁶ W · 0.712 L☉
- Surface temperature
- 5,443 K (5,170 °C)
- Peak wavelength
- 532 nm · green-yellow visible light
- Computed (Wien's law) from the surface temperature
Discovery & history
- Method
- Telescope
- Name
- A Luyten proper-motion catalogue designation.
Catalogued for its proper motion; in 2020 the TESS mission found its ultra-hot Neptune transiting.
Images
Images from open archives · credit shown per image