G 139-21 Gliese 1214

Stellar classification



  • X -17
  • Y 17
  • Z 35
→ Sol: 42

Object type

  • High proper-motion Star
  • Star
  • Infra-Red source
simbad:GJ 1214


Gliese 1214 is a dim M4.5 red dwarf in the constellation Ophiuchus with an apparent magnitude of 14.7. It is located at a distance of approximately 47 light years from Earth. The star is about one-fifth the radius of the Sun with a surface temperature estimated to be 3000 K (2730 °C; 4940 °F). Its luminosity is only 0.003% that of the Sun.

The estimate for the stellar radius is 15% larger than predicted by theoretical models. It also shows a 1% intrinsic variability in the near-infrared probably caused by stellar spots. The star is rotating slowly, with a period that is most likely an integer multiple of 53 days. It is probably at least three billion years old and a member of the old disk. Although GJ 1214 has a low to moderate level of magnetic activity, it does undergo flares and is a source of X-ray emission with a base luminosity of 7.4×1025 erg s−1. The temperature of the corona is estimated to be about 3.5×106 K.

This article uses material from the Wikipedia article "Gliese 1214", which is released under the Creative Commons Attribution-Share-Alike License 3.0.