Gliese 221, a red dwarf star in Orion

Gliese 221 (HIP 27803)

Gliese 221 is a red dwarf star in the constellation Orion. At 66 light years away, it shines at an apparent visual magnitude of 9.70. It is moving through the Galaxy at a speed of 40.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 16,800 and 24,500 light years from the center of the Galaxy. It came closest to the Sun 277,000 years ago when it had brightened to magnitude 9.29 from a distance of 55 light years. Gliese 221 has two confirmed planets known to date (July 2013).

Sky position: RA 5h 53.0m, Dec -5° 59.4'

Common designations: HIP 27803, Gliese 221

Galactic Orbit of Gliese 221
(compared to the Sun)

E

ccentricity: 18.8% vs. 16.0%

Angle φ : 160.4°vs. 26.0°

Semi-major axis : 6,327 pc vs. 8,686 pc

Semi-minor axis: 6,215 pc vs. 8,574 pc

Focus-to-center

: 1,188 pcvs. 1,388 pc

Semilatus rectum : 6,104 pc vs. 8,464 pc

Perigalacticon: 5,139 pc vs. 7,297 pc

Apogalacticon

: 7,516 pcvs. 10,074 pc
  Some Tabulated XHIP Data for Gliese 221
(see also: SIMBAD)

Astrometry
2007A&A...474..653V

Position	Proper Motion
Right Ascension:	88.25118849° ±1.28 mas	-0.39 ±1.00 mas/yr.
Declination:	-5.99400206° ±1.13 mas	-346.75 ±0.99 mas/yr.
Galactic Longitude:	211.65579874°	310.05 mas/yr.
Galactic Latitude:	-15.71497153°	-155.26 mas/yr.

Parallax: 49.23 ± 1.65 mas

Spectrography

Spectral Type: M0 V 1972AJ.....77..486U.

Radial Velocity: 22.70 ±1.40 km/s [A rating] 2006AstL...32..759G.

Iron Abundance [Fe/H]: n/a

Photometry
 

band	magnitude	Abs. Mag.
U
B	11.02	9.49
V	9.70	8.16
R	8.86	7.32
I	8.10	6.56
J	7.13	5.59
H	6.52	4.98
K	6.31	4.77

B-V: +1.32 V-I: +1.60

Derivations

Heliocentric distance: 20.29 pc (3.4% margin of error)

Galactocentric distance: 7,417 pc

Transverse velocity: 33.3 km/s

3D heliocentric position and motion:

toward:	Galactic center	Galactic rotation	North Galactic Pole
Position ( X, Y, Z)	-16.6 pc	-10.2 pc	-5.5 pc
Velocity (U, V, W)	0.5 km/s	-34.7 km/s	-20.5 km/s