Gliese 221

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Gliese 221
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Orion
Right ascension	05^h 53^m 00.0^s
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.

Planetary system

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,^[1] were deduced by radial velocity. They were published in January 2013. In January of 2014, a new, sub-Saturn planet candidate was reported. ^[2]

The Gliese 221 system^[3]^[4]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	>0.027 ± 0.004 M_J	0.0428 ± 0.0007	3.8728 ± 0.0004	-	—	—
c	>0.17 ± 0.03 M_J	0.435 ± 0.007	125.94 ± 0.44	0.31 ± 0.11	—	—
d (unconfirmed)	>0.07 M_J	—	500	—	—	—

References

↑ The preprint defined the star's HZ to 0.5-0.9 AU. Square root of luminosity would put an Earth analogue at 0.31 AU. The planet's semimajor is 0.435 AU.
↑ A new cold sub-Saturnian candidate planet orbiting GJ 221: Mikko Tuomi, January 16, 2014
↑ "Planet BD-061339b".
↑ G. Lo Curto et al. (2013). The HARPS search for southern extrasolar planets: XXXVI. New multi-planet systems in the HARPS volume limited sample: a super-Earth and a Neptune in the habitable zone. arXiv:1301.2741. Bibcode:2013arXiv1301.2741L.

← Star systems within 65–70 light-years →

Star systems (including brown dwarf systems) within 65–70 light-years from Earth.

Giant star

K III	Aldebaran (65.1 ± 1.3 ly; 1 star) Epsilon Scorpii «Wei» (65.4 ± 1.1 ly; 1 star) Alpha Arietis «Hamal» (65.9 ± 1.3 ly; 1 star, 1 planet: b) Nu Octantis (69.1 ± 4.5 ly; 1 star)

F
(Yellow-white)

IV	Tau Cygni (66.4 ± 0.8 ly; 2 stars) Theta Draconis (68.3 ± 0.8 ly; 2 stars) 40 Leonis (69.0 ± 1.2 ly; 1 star) I Puppis (69.1 ± 0.8 ly; 1 star) Iota Virginis «Syrma» (69.8 ± 1.3 ly; 1 star)

V	Alpha Caeli (65.7 ± 0.7 ly; 2 stars) Kappa Tucanae (66.04 ± 1.2 ly; 4 stars) HR 8853 (66.1 ± 0.8 ly; 1 star) Gamma Doradus (66.2 ± 0.7 ly; 1 star) HR 6349 (66.5 ± 1.2 ly; 1 star) Sigma² Ursae Majoris (66.7 ± 0.9 ly; 3 stars) HR 8531 (66.8 ± 0.8 ly; 1 star) HR 8843 (67.1 ± 0.8 ly; 1 star) 17 Cygni (68.0 ± 0.8 ly; 2 stars) HR 7631 (68.1 ± 0.5 ly; 1 star) 13 Ceti (68.3 ± 1.8 ly; 3 stars) HD 33564 (68.4 ± 0.8 ly; 2 stars, 1 planet: b) HR 8013 (68.5 ± 1.4 ly; 1 star) HD 124580 (68.7 ± 1.2 ly; 1 star) 71 Orionis (68.9 ± 1.3 ly; 4 stars) HR 3578 (69.5 ± 1.5 ly; 1 star) 50 Persei (69.6 ± 1.2 ly; 3 stars) B Carinae (69.8+5.4 −4.7 ly; 1 star) Kappa Reticuli (69.9 ± 0.7 ly; 2 stars)

G
(Yellow)

IV	HD 114613 (66.8 ± 1.1 ly; 1 star, 1(+?) planets: b) 94 Aquarii (67.6+8.3 −6.6 ly; 2 stars) HD 210277 (69.4 ± 1.2 ly; 1 star, 1 planet: b) HD 10086 (69.8 ± 1.2 ly; 1 star)

V	GJ 1233 (65.2 ± 0.7 ly; 1 star) 53 Aquarii (65.5 ± 3.5 ly; 2 stars) Pi¹ Cancri (65.7 ± 1.4 ly; 2 stars, 2 brown dwarfs) Gliese 762.2 (65.7 ± 1.3 ly; 1 star) GJ 3863 (66.4 ± 0.9 ly; 1 star) 9 Ceti (66.5 ± 1.3 ly; 1 star) GJ 1262 (66.8 ± 1.1 ly; 1 star) GJ 3593 (67.3 ± 1.2 ly; 1 star) HD 24496 (67.4 ± 1.5 ly; 1 star, 1 planet: b) HR 7330 (68.0 ± 1.9 ly; 1 star) HR 5 (68.2 ± 1.3 ly; 2 stars) HR 7260 (68.3 ± 1.1 ly; 2 stars) Gliese 59.1 (68.5 ± 0.9 ly; 1 star) HR 7914 (68.5 ± 1.1 ly; 2 stars) 51 Arietis (69.0 ± 1.3 ly; 1 star) V774 Tauri (69.1 ± 1.6 ly; 1 star) HR 5070 (69.6 ± 0.8 ly; 1 star) GJ 3917 (69.6 ± 1.6 ly; 1 star) GJ 3257 (69.8 ± 1.5 ly; 1 star) c (16) Cygni (69.8 ± 0.8 ly; 3 stars, 1 planet: Bb)

K V
(Orange)

Gliese 292.1 (65.2 ± 1.4 ly; 1 star)
Gliese 268.2 (65.2 ± 1.3 ly; 1 star)
GJ 1278 (65.3 ± 1.4 ly; 1 star)
Gliese 342 (65.4 ± 1.4 ly; 1 star)
Gliese 747.3 (65.4 ± 2.0 ly; 1 star)
Gliese 456.1 (65.6 ± 1.3 ly; 2 stars)
HD 110810 (65.6 ± 1.3 ly; 1 star)
HD 136923 (65.7 ± 1.2 ly; 1 star)
HD 149806 (65.7 ± 1.2 ly; 2 stars)
GJ 3620 (65.9 ± 1.7 ly; 1 star)
Gliese 765.4 (65.9 ± 1.1 ly; 2 stars)
Gliese 199 (66.1 ± 3.0 ly; 2 stars)
Gliese 836.8 (66.2 ± 2.0 ly; 1 star)
Gliese 221 (66.3+2.3
−2.1 ly; 1 star, 3 planets: b
c
d)
Gliese 840 (66.3 ± 1.3 ly; 1 star)
GJ 2001 (66.3 ± 1.1 ly; 1 star)
Gliese 558 (66.4 ± 1.8 ly; 1 star)
Gliese 257.1 (66.6 ± 1.3 ly; 1 star)
GJ 1069 (66.6+6.7
−5.6 ly; 1 star, 1 brown dwarf)
HD 114783 (66.6 ± 1.5 ly; 1 star, 1 planet: b)
DK Leonis (66.6 ± 2.4 ly; 1 star)
HD 30501 (66.7 ± 0.9 ly; 2 stars)
GJ 9714 (66.7 ± 2.4 ly; 1 star)
Gliese 783.2 (66.8 ± 1.3 ly; 2 stars)
GJ 1172 (66.9 ± 2.3 ly; 1 star)
GJ 3358 (66.9 ± 1.4 ly; 1 star)
HD 155712 (67.0 ± 1.4 ly; 1 star)
Gliese 217 (67.1 ± 1.4 ly; 1 star)
HD 332518 (67.3 ± 1.7 ly; 1 star)
Gliese 808.2 (67.4 ± 2.6 ly; 1 star)
GJ 1108 (67.6+4.7
−4.2 ly; 2 stars)
Gliese 53.1 (67.7 ± 1.5 ly; 2 stars)
GJ 1084 (67.7 ± 1.5 ly; 1 star)
GJ 1008 (67.7 ± 2.5 ly; 1 star)
Gliese 30 (67.7 ± 1.5 ly; 1 star)
Gliese 544 (67.8 ± 1.6 ly; 2 stars)
GJ 1280 (67.9 ± 1.5 ly; 1 star)
HD 104067 (67.9 ± 1.5 ly; 1 star, 1 planet: b)
Gliese 533 (68.0 ± 2.6 ly; 2 stars)
Gliese 415 (68.2 ± 2.8 ly; 1 star)
Gliese 371 (68.4 ± 2.3 ly; 1 star)
HD 220221 (68.4 ± 1.4 ly; 1 star)
HD 119802 (68.5 ± 1.7 ly; 1 star)
Gliese 491 (68.5 ± 1.3 ly; 2 stars)
HD 216259 (68.6 ± 1.7 ly; 1 star)
Gliese 396 (68.6 ± 0.9 ly; 1 star)
Gliese 889 (68.9 ± 2.8 ly; 2 stars)
GJ 1165 (69.1 ± 2.9 ly; 1 star)
Gliese 659 (69.2 ± 2.9 ly; 2 stars)
Gliese 276 (69.3 ± 1.9 ly; 1 star)
GJ 1048 (69.3 ± 1.6 ly; 1 star)
Gliese 155.2 (69.5 ± 1.4 ly; 1 star)
HD 97658 (69.5 ± 1.5 ly; 1 star, 1 planet: b)
HD 92945 (69.8 ± 1.0 ly; 1 star)
Gliese 857.1 (69.8 ± 2.6 ly; 2 stars)
V775 Herculis (69.9 ± 1.6 ly; 1 star)
GJ 4268 (70.0 ± 1.0 ly; 2 stars)
GJ 3071 (70.0 ± 2.5 ly; 1 star)

M V (Red dwarf)	Gliese 328 (65.3 ± 3.0 ly; 1 star, 1 planet: b) Gliese 330.1 (67.2 ± 1.8 ly; 1 star) CR Draconis (67.4 ± 1.7 ly; 1 star) HIP 105533 (67.6 ± 2.3 ly; 1 star) Gliese 336 (69.0+4.5 −4.0 ly; 1 star) Gliese 122 (69.5 ± 2.1 ly; 1 star) GJ 4254 (69.8+14.1 −10.1 ly; 1 star)

White
dwarf

DC	GD 356 (68.8+5.5 −4.7 ly; 1 star)

Brown
dwarf

L	DENIS-P J1228.2-1547 (66.0+2.6 −2.4 ly; 2 brown dwarfs)

T	WISE 0413-4750 (~66.2 ly; 1 brown dwarf) WISE 0123+4142 (~67.2 ly; 1 brown dwarf) WISE 0625+5646 (~67.2 ly; 1 brown dwarf) WISE 0821+1443 (~68.2 ly; 1 brown dwarf) WISE 0448-1935 (~69.8 ly; 1 brown dwarf)

Y	WISE 0535-7500 (68.5+42.4 −35.9 ly; 1 brown dwarf)

In left column are stellar classes of primary members of star systems. Bold are systems containing at least one component with absolute magnitude of +8.5 or brighter. Italic are systems without known trigonometric parallax.

v t e Stars of Orion

Bayer	α (Betelgeuse) β (Rigel) γ (Bellatrix) δ (Mintaka) ε (Alnilam) ζ (Alnitak) η (Algjebba) θ¹ (Trapezium Cluster): θ¹ A θ¹ B θ¹ C θ¹ D θ² ι (Hatsya) κ (Saiph) λ (Meissa) μ ν ξ ο¹ ο² π¹ π² π³ (Tabit) π⁴ π⁵ π⁶ ρ σ τ υ (Thabit) φ¹ φ² χ¹ χ² ψ ω

Flamsteed	5 6 11 12 13 14 15 16 18 21 22 23 25 26 27 29 31 32 33 35 38 42 45 49 51 52 55 56 57 59 60 63 64 65 66 68 69 71 72 73 74 75

Variable	S T U W Z RS UX VV YY AN BF BL BM BN BQ CK CN CO CZ DN DY ER EW EY FH FT FU FZ GG GP GU GW HK KX V346 V351 V359 V371 V372 V380 V586 V901 V1031 V1046 V1051 V1107 V1118 V1149 V1155 V1156 V1159 V1162 V1179 V1192 V1197 V1261 V1307 V1309 V1355 V1357 V1366 V1369 V1377 V1389 V1647 V1649 V1788

HR	1507 1519 1522 1534 1553 1571 1574 1576 1578 1591 1596 1600 1613 1618 1619 1646 1681 1684 1685 1687 1691 1697 1701 1703 1709 1717 1724 1748 1759 1763 1764 1778 1781 1782 1786 1799 1803 1806 1807 1809 1819 1820 1826 1830 1832 1833 1840 1848 1861 1873 1874 1883 1886 1887 1891 1908 1911 1913 1918 1920 1923 1933 1940 1942 1950 1952 1955 1959 1967 1978 1986 1987 1988 2007 2014 2019 2024 2030 2039 2048 2051 2057 2070 2071 2075 2076 2093 2097 2099 2113 2133 2174 2184 2191 2214 2218 2222 2231 2233 2235 2236 2251 2253 2259 2269 2275 2287 2302

HD	30869 31253 31423 33636 34445 35575 35775 36150 36558 36629 36814 36840 37605 37806 37903 38087 38801 290327

Gliese	Gliese 179 Gliese 182 Gliese 205 Gliese 208 Gliese 221 GJ 3379

Other	BD +03 740 Becklin–Neugebauer Object G 99-37 G 99-47 LkHα 208 LP 658-2 2MASS J05352184-0546085 OMC-2 FIR 4 Orion source I Reipurth 50 Ross 47 RX J0529.4+0041 S Ori 52 S Ori 70 4U 0614+091 WISE J0457-0207 WISE J0521+1025

List

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