Gliese 221

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Gliese 221
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension 05h 53m 00.285s[1]
Declination −05° 59′ 41.44″[1]
Apparent magnitude (V) 9.70[2]
Characteristics
Spectral type K7V/M0V[3]
B−V color index 1.321±0.001[2]
Distance
66.23 ± 0.02 ly
(20.305 ± 0.008 pc)
Absolute magnitude (MV)8.154±0.077[4]
Details
Gyr
Gaia EDR3
3022099969137163904
Database references
Exoplanet Archive
data

Gliese 221 (GJ 221), also known as BD-06 1339, is a

″·yr−1.[7]

This is a

active star and the level of chromospheric activity has been found to vary significantly over time.[3] The star is radiating 10%[5] of the luminosity of the Sun from its photosphere at an effective temperature of 4,324 K.[5]

Planetary system

From 2003 to 2012, the star was under observance from the High Accuracy Radial Velocity Planet Searcher (

HARPS
). It is becoming less active and this reduced activity allowed for lower-mass planetary measurements to be made.

A super-Venus

d was proposed.[10]

The planet Gliese 221b (BD-06 1339 b) is not transiting the disk of the parent star,[11] and its existence was disputed in 2022.[12]

The Gliese 221 planetary system[13][8]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b (disputed[12]) >8.5806 ± 1.2712 M🜨 0.0428 ± 0.0007 3.8728 ± 0.0004 — — —
c >54.026 ± 9.534 M🜨 0.435 ± 0.007 125.94 ± 0.44 0.31 ± 0.11 — —
d (unconfirmed) 22.246 M🜨 1.0947 500 — — —

References

  1. ^
    doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  2. ^
    S2CID 119257644
    .
  3. ^
    S2CID 116916728
    , A59.
  4. ^
    S2CID 119118088
    .
  5. ^
    S2CID 119374557
    .
  6. ^ "BD-06 1339". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-18.
  7. Bibcode:1995yCat.1098....0L
    .
  8. ^
    S2CID 116916728
    .
  9. S2CID 119212312
    .
  10. doi:10.1093/mnrasl/slu014
  11. S2CID 86862862
    .
  12. ^
    S2CID 247446960
    .
  13. ^ "Planet BD-06 1339 c", Extrasolar Planets Encyclopaedia.
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