LHS 1140

LHS 1140 is a red dwarf about 49 light-years away. It is of interest for having a rocky planet (LHS 1140 b) of about 6 Earth masses within its habitable zone. Helium detection in the planet's atmosphere was announced in 2026, the first detection of a significant atmosphere of a rocky planet. (Such study of the atmosphere of rocky extra-solar planets is currently a challenge.) LHS 1140 characteristics:

• Cetus - constellation.
• 00h44m59.33s - right ascension.
• -15deg16m17.5s - declination.
• +14.18 - apparent magnitude (V).
• 14.96 pc - distance.
• M4.5V - spectral type.
• 0.1844 - mass(solar masses).
• 0.0038 - luminosity(solar).
• 0.2159 - radius(solar).

LHS 1140 b:

• 1.73 - radius(Earth).
• 5.6 - mass(Earth).
• 5.9 g/cm - density (CF Earth: 5.5 g/cm, rock: 2-3 g/cm).
• 226 K - equilibrium temperature (≡ -47°C or -53°F).