Gliese 221 information

Gliese 221
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Orion
Right ascension	05h 53m 00.285s
Declination	−05° 59′ 41.44″
Apparent magnitude (V)	9.70
Characteristics
Spectral type	K7V/M0V
B−V color index	1.321±0.001
Astrometry
Radial velocity (Rv)	+22.9±0.4 km/s
Proper motion (μ)	RA: −1.170 mas/yr ; Dec.: −346.762 mas/yr
Parallax (π)	49.2485 ± 0.0185 mas
Distance	66.23 ± 0.02 ly ; (20.305 ± 0.008 pc)
Absolute magnitude (MV)	8.154±0.077
Details
Mass	0.72±0.21 M☉
Radius	0.613±0.064 R☉
Luminosity	0.095±0.01 L☉
Surface gravity (log g)	4.74±0.02 cgs
Temperature	4,324±100 K
Metallicity [Fe/H]	−0.34±0.08 dex
Age	4.4±4 Gyr
Other designations
	BD−06 1339, GJ 221, HIP 27803, PPM 188554, LTT 2396, 2MASS J05530028-0559410, Gaia EDR3 3022099969137163904
Database references
SIMBAD	data
Exoplanet Archive	data

Gliese 221 (GJ 221), also known as BD-06 1339, is a star with an exoplanetary companion in the equatorial constellation of Orion. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 9.70^[2] and an absolute magnitude of 8.15.^[4] Using parallax measurements, the distance to this system can be estimated as 66.2 light-years. It is receding from the Sun with a radial velocity of +23 km/s.^[1] This is a high proper motion star, traversing the celestial sphere at an angular rate of 0.333″·yr⁻¹.^[7]

This is a late K-type or early M-type main-sequence star with a stellar classification of K7V/M0V.^[3] It has 72% of the mass and 61% of the radius of the Sun.^[5] The star is roughly 4.4^[5] billion years old and is depleted in heavy elements, containing just 46% of solar abundance of iron.^[5] It is an 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]

^ ^a ^b ^c ^d ^e ^f Cite error: The named reference EDR3 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Lo_Curto_et_al_2013 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Houdebine_et_al_2016 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Cite error: The named reference Sousa2018 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).

[EDR3-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference EDR3 was invoked but never defined (see the help page).

[Anderson_Francis_2012-2] Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).

[Lo_Curto_et_al_2013-3] Cite error: The named reference Lo_Curto_et_al_2013 was invoked but never defined (see the help page).

[Houdebine_et_al_2016-4] Cite error: The named reference Houdebine_et_al_2016 was invoked but never defined (see the help page).

[Sousa2018-5] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Cite error: The named reference Sousa2018 was invoked but never defined (see the help page).

[SIMBAD-6] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Luyten1995-7] Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Orion
Right ascension	05^h 53^m 00.285^s^[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]
Astrometry

Radial velocity (R_v)	+22.9±0.4^[1] km/s
Proper motion (μ)	RA: −1.170 mas/yr^[1] Dec.: −346.762 mas/yr^[1]
Parallax (π)	49.2485 ± 0.0185 mas^[1]
Distance	66.23 ± 0.02 ly (20.305 ± 0.008 pc)
Absolute magnitude (M_V)	8.154±0.077^[4]

Details

Mass	0.72±0.21^[5] `M`_☉
Radius	0.613±0.064^[4] `R`_☉
Luminosity	0.095±0.01^[5] `L`_☉
Surface gravity (log g)	4.74±0.02^[5] cgs
Temperature	4,324±100^[5] K
Metallicity [Fe/H]	−0.34±0.08^[5] dex
Age	4.4±4^[5] Gyr

Other designations
BD−06 1339, GJ 221, HIP 27803, PPM 188554, LTT 2396, 2MASS J05530028-0559410,^[6] Gaia EDR3 3022099969137163904
Database references
SIMBAD	data
Exoplanet Archive	data

Gliese 221 information

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