Gliese 221
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Orion |
| Right ascension | 05h 53m 00.0s |
| Declination | −05° 59′ 41″ |
| Apparent magnitude (V) | 9.69 ± 0.01 |
| Characteristics | |
| Spectral type | K7V/M0V |
| Astrometry | |
| Parallax (π) | 49.23±1.65 mas |
| Distance | 66 ly (20 ± 1 pc) |
| Details | |
| Mass | 0.7 M☉ |
| Radius | ? R☉ |
| Luminosity | 0.095 ± 0.01 L☉ |
| Surface gravity (log g) | 4.74 ± 0.02 cgs |
| Temperature | 4324 ± 100 K |
| Metallicity | -0.14 ± 0.17 |
| Age | 4.4 ± 4 × 109 years |
| Other designations | |
|
BD-061339, HIP 27803, LTT 2396
|
|
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia |
data |
Gliese 221 is an orange-red dwarf star.
From 2003 to 2012, the star was under observance from HARPS. It is becoming less active and this reduced activity allowed for lower-mass planetary measurements to be made.
In 2012, a super-Venus planet, and an eccentric Neptune / Saturn in the habitable zone, were deduced by radial velocity. They were published in January 2013. In January 2014, a new, sub-Saturn planet candidate was reported.
...
Wikipedia