The Sun’s Back Yard
::: Selected Star Systems Within 32.6 Light Years [10 Parsecs]
|
STAR |
TYPE |
DIST. (LYR) |
MASS (MSOL) |
AGE (GYR) |
[Fe/H] |
REMARKS |
|
Alpha |
G2, K0,
M5.5 |
4.4 |
1.1, |
4.85 |
+0.23 |
HD 128620 & HD
128621. Close binary with distant M dwarf companion; luminosity 1.52 and 0.5
LSOL; a = 23.4 AU,
periastron = 11.2, apastron = 35.6, e = 0.52, period 79.9 yr. Terrestrial
planets are possible around stars A and B. (Thevenin
2002, Kervella 2003a) |
|
Sirius |
A1, D |
8.6 |
2.07, |
0.24 |
0.00 |
HD 48915. Binary system containing a mature A star (radius 1.71
RSOL, luminosity 25 LSOL.) and dim white dwarf
as small as Earth. Progenitor of the white dwarf was a B star of 5 MSOL. (Kervella 2003b, Liebert 2005) Canis Major |
|
*Epsilon |
|
10.5 |
0.824 |
0.80 |
-0.03 |
Young orange star with
a massive debris disk and one Jupiter-mass planet at 3.38 AU in an eccentric
orbit (e = 0.7). (Benedict 2006) |
|
Epsilon |
K5, T |
11.8 |
0.77 |
1.4 |
+0.01 |
HD 209100. Orange dwarf with a distant pair of brown dwarfs
(1460 AU) and perhaps a massive gas giant planet at about 10 AU (Scholz 2003, Janson 2009). |
|
Tau Ceti |
G8 |
11.9 |
0.83 |
10 |
-0.31 |
HD 10700. Extensive debris belt whose central clearance suggests
planets within 10 AU (Greaves 2005). All values Di Folco 2004, who also provide radius = 0.80 RSOL. |
|
Procyon |
F5 IV, |
12 |
1.49, |
1.72 |
-0.05 |
Yellow-white subgiant (7 LSOL, 2 RSOL) sharing an eccentric 41-year orbit with a
white dwarf (Eggenberger 2005). Canis Minor |
|
*GJ 674 |
M2.5 |
14.7 |
0.35 |
- |
-0.24 |
M dwarf with a single
Hot Neptune planet (11 MEA) in a somewhat eccentric orbit; additional low-mass planets
possible. Ara |
|
*GJ 876 |
M4 |
15.4 |
0.32 |
- |
+0.23 |
M dwarf with 4 known
planets; the innermost (7 MEA) is one of the smallest exoplanets yet detected. Aquarius |
|
*GJ 832 |
M1.5 |
16 |
0.45 |
- |
-0.24 |
M dwarf with one gas giant about 60% as
massive as Jupiter in a low-eccentricity orbit at 3.4 AU; potential host for
icy exomoons.
All values Bailey 2008. |
|
Omicron |
K1, D, |
16.3 |
0.89, RECONS |
12.2 Valenti 2005 |
-0.08 Valenti |
HD 26965. The K1 star is orbited by a distant (418 AU) red
dwarf/white dwarf binary (ISDB). Age
is uncertain; e.g., Rocha-Pinto 2004, 4.01 GYR. Lower
[Fe/H] values are found; e.g., Haywood, [Fe/H] = -0.34 |
|
70 |
K1, K5 |
16.6 |
0.92, |
- |
+0.04 Takeda |
HD 165341. Binary system with two orange dwarfs. Semimajor axis 23.2 AU, period 83.38 yr, e
= 0.499, periastron 11.4 AU, apastron 34.8 AU (Pourbaix
2000). Lower [Fe/H] values are found; e.g.,
Nordstrom 2004, [Fe/H] = -0.29 |
|
STAR |
TYPE |
DIST. (LYR) |
MASS (MSOL) |
AGE (GYR) |
[Fe/H] |
REMARKS |
|
Altair |
A7 IV |
17 |
1.75 |
0.63 |
-0.16 |
HD 187642. Rapidly rotating white star entering subgiant phase
(all values Buzasi 2005). |
|
Sigma |
K0 |
18.9 |
0.803 Takeda |
3.2 Bryden |
-0.23 Bryden |
HD 185144 |
|
VB 10 |
M8 |
19 |
0.078 |
- |
- |
Ultracool star near red dwarf/brown dwarf
boundary; Pravdo 2009 reported astrometric
detection of a planetary-mass object (3-9 MJUP) at small semimajor axis, but Bean 2009 declared
it spurious, given null radial velocity data. |
|
Eta |
G0, K7 |
19.6 |
1.11 RECONS |
2.88 Takeda |
-0.31 Lambert |
HD 4614. ISDB (after |
|
82 Eridani |
G8 |
19.9 |
0.845 Takeda |
13.5 Valenti |
-0.23 Valenti |
HD 20794. Values are uncertain; e.g., Rocha-Pinto 2004, age 7.06
GYR; Cayrel
de Strobel 2001, [Fe/H] range from -0.44 to -0.54 |
|
Delta |
G7 IV |
19.9 |
0.991 Takeda |
6.2 Valenti |
+0.26 Valenti |
HD 190248. Metal-rich
subgiant whose progenitor may have been an F-type star. |
|
*GJ 581 |
M3 |
20 |
0.31 |
- |
-0.226 |
M dwarf with one short-period
Neptune-mass planet and 3 Super Earths in orbits bracketing the system's
habitable zone. Libra |
|
HD 219134 |
K3 |
21.2 |
0.794 Takeda |
12.46 Takeda |
+0.09 Valenti |
GJ 892. Bryden 2006 provide similar age & metallicity. Cassiopeia |
|
Xi Boötis |
G8, K4 |
21.8 |
0.94, RECONS |
5.3 Valenti |
-0.07 Valenti |
HD 131156, HIP 72659.
Binary with semimajor axis = 33.6 AU, e = 0.51, period 151 yr,
periastron 16.5 AU, apastron 50.7 AU (SolStation,
citing 6th Catalog of Visual Orbits of Binary Stars); Bonavita
2007 give a = 32.8, p = 152 yr. |
|
36 |
K1, K5 |
22.2 |
0.85, RECONS |
- |
-0.24 to -0.39 Cayrel de |
HD 155885 & 155886, GJ 663 ABC. Triple system with 2 K1-type stars (both
0.85 MSOL) in binary orbit with
a = 83 AU, e = 0.9, period = 549 yr (ISDB), plus a K5 star (0.71 MSOL) in a longer circumbinary orbit.
Main binary has periastron = 8.3 AU, probably ruling out planet
formation. |
|
*GJ 667C |
M1.5 |
22.7 |
- |
- |
- |
Triple system with 2 K-type stars (A, B) in a close binary
orbit, plus a more distant M dwarf with a single Super Earth (5.7 Mea) orbiting
in about 7 days. Scorpio |
|
HD 4628 |
K1 |
24.3 |
0.637 Valenti |
11.04 Valenti |
-0.19 Valenti |
GJ 33. Mass seems too
small for spectral type; all values are uncertain. Takeda 2005 give mass 0.80; Rocha-Pinto
2004 give age 7.54, metallicity -0.31 |
|
STAR |
TYPE |
DIST. (LYR) |
MASS (MSOL) |
AGE (GYR) |
[Fe/H] |
REMARKS |
|
Beta |
G2 IV |
24.4 |
1.143 Takeda |
6.32 Takeda |
-0.09 Valenti |
HD 2151; subgiant star. Takeda 2007 give radius 1.84 RSOL; Cayrel
de Strobel 2001 list a range of [Fe/H] from -0.10
to -0.28 |
|
107 |
K1 |
24.5 |
0.812 Valenti |
8.7 Valenti |
-0.07 Valenti |
HD 10476. Bryden 2006 give age 4.6 GYR, [Fe/H] -0.16 |
|
Vega |
A0 |
25 |
2.3 |
.20 |
-0.50 |
HD 172167. Bright A-type
star (37 LSOL); rotation 12.5
hours. Extensive debris disk & planetary candidates. (Hill 2004, Aufdenberg
2006) Lyra |
|
*Fomalhaut |
A3 |
25 |
2.0 |
.29 |
-0.10 |
HD 216956. One long-period gas giant planet and a bright debris
ring have been imaged. Piscis Austrinus |
|
Pi |
F6 |
26.2 |
1.236 Takeda |
2.84 Takeda |
0.00 Valenti |
HD 30652; Takeda 2007 suggest 1.32 RSOL. |
|
Chi |
F7, K0 |
26.3 |
0.95 Chen 2001 |
9.4 Chen 2001 |
-0.65 Chen 2001 |
GJ 178, HD 170153. Close, moderately eccentric binary; semimajor
axis about 1 AU (Tomkin 1987, Pourbaix
2000); tight orbit rules out planet formation. |
|
HD 10360 |
K0 |
26.4 |
0.75, Bonavita |
3.24 Rocha |
-0.25 Rocha |
GJ 66 AB. Two K0 stars of
similar mass sharing an orbit of 484 years. Bonavita
2007 give a = 52.2 AU, e = 0.53, corresponding to periastron = 24.5. Eridanus |
|
Chara |
G0 |
27.4 |
1.03 Takeda |
3.68 Takeda |
-0.10 Valenti |
HD 109358, Beta Canum Venaticorum. Age is uncertain; e.g., Valenti
2005, 4.9 GYR; Chen 2001, 12.4 GYR. Canes Venatici |
|
*61 |
G5 |
27.7 |
0.942 Takeda |
6.31 Trilling |
-0.03 Trilling |
HD 115617. Sun-like star with 1 Super Earth and 2 Neptune-mass
planets within 0.48 AU, plus dusty debris belts at wider radii. |
|
Zeta |
F9 |
28 |
1.01 Takeda |
3.02 Trilling |
-0.10 Trilling |
HD 1581. Very similar to our Sun in age and mass, but less
metallic. Debris belt with inner
radius of 2.3 AU (Trilling 2008). |
|
41 |
G8, M |
28.7 |
0.79, 0.47 Bonavita |
1.80 Takeda |
-0.27 Valenti |
HD 156274; young metal-poor G star with long-period M dwarf
companion; a = 91.65, e = 0.78, periastron = 20 AU (Bonavita
2007). Key parameters are uncertain; e.g., Valenti
2005, mass 0.901 MSOL, age 8.7 GYR; Nordstrom 2004, [Fe/H] = -0.55 |
|
STAR |
TYPE |
DIST. (LYR) |
MASS (MSOL) |
AGE (GYR) |
[Fe/H] |
REMARKS |
|
HD 32147 |
K3 |
28.7 |
0.838 Takeda |
5.3 Valenti |
+0.30 Valenti |
GJ 183. High stellar metallicity favors planet formation, but
some sources indicate a close binary companion that would rule out planetary
accretion and survival. Eridanus |
|
*GJ 849 |
M3.5 |
29 |
0.49 |
- |
+0.41 |
Red dwarf substantially
more metallic than our Sun with a Jupiter twin at 2.35 AU in a circular orbit
(e = 0.07); potential host for icy exomoons. Low mass planets possible on
interior orbits. Aquarius |
|
Gamma |
F7, |
29.3 |
1.21 Chen 2001 |
2.6 Chen 2001 |
-0.07 Chen 2001 |
HD 38393, GJ 216 AB, HIP 27072.
Mass value applies to F7 star; ISDB provides 0.63 MSOL for |
|
*GJ 433 |
M1.5 |
29.5 |
- |
- |
- |
M dwarf with a single Super Earth (6 Mea) in an orbit of about 7
days. Hydra |
|
Delta |
K0 IV |
29.5 |
1.193 Takeda |
6.28 Takeda |
+0.03 Valenti |
HD 23249, Rana. Orange subgiant whose progenitor was an F
or G star. Takeda 2007 give radius 2.27 RSOL; Cayrel de Strobel 2001 give [Fe/H] = -0.20 |
|
Beta Comae Berenices |
Go |
29.9 |
1.147 Takeda |
2.3 Bryden |
+0.03 Bryden |
HD 114710. Bryden 2006 give F9.5 as
spectral type. Older ages are also found: Lambert 2004, 7.23 GYR; Chen 2001, 9.6 GYR. |
|
*GJ 317 |
M3.5 |
30 |
0.24 |
- |
-0.23 |
Lightweight M dwarf
with a Jupiter-mass planet at 0.95 AU; potential host for icy exomoons.
Additional gas giant likely on exterior orbit; low-mass planets possible on
interior orbits. Pyxis |
|
HD 102365 |
G5, M |
30 |
0.86, 0.09 Bonavita |
9.48 Takeda |
-0.26 Valenti |
GJ 442 A. Wide binary; Bonavita 2007
suggest a = 275 AU. Endl 2002 rule out Hot Jupiters. Age is uncertain; Ibukiyama 2002, 6.12 GYR; Valenti 2005, 11.0
GYR. |
|
Gamma |
F6 |
30.1 |
0.95 Chen 2001 |
7.2 Chen 2001 |
-0.67 Chen 2001 |
GJ 827, HD 203608. Bryden 2006 give F8
as spectral type. |
|
*GJ 176 |
M2 |
30.6 |
0.50 |
- |
+0.18 |
Large M dwarf with one Super Earth or Warm Neptune. Most values Forveille
2009. |
|
61 Ursae |
G8 |
31.1 |
0.73 Valenti |
5.1 Valenti |
-0.03 Valenti |
HD 101501. Younger ages
are also found; key parameters are uncertain; e.g., Bryden 2006, age
1.1 GYR, [Fe/H] = -0.20;
Rocha-Pinto 2004, age 0.59 GYR; Takeda 2005, mass 0.88 MSOL. |
|
12 |
K0 |
31.9 |
0.853 Valenti |
4.3 Valenti |
+0.05 Valenti |
HD 149661. Younger ages are also found: Bryden
2006, 1.2 GYR; Rocha-Pinto 2004,
0.83 GYR. |
|
AU |
M1 |
32.3 |
0.50 |
0.02 |
- |
Young M dwarf with debris disk (Kalas
2004). |
|
STAR |
TYPE |
DIST. (LYR) |
MASS (MSOL) |
AGE (GYR) |
[Fe/H] |
REMARKS |
* One or more planets detected
All distances are provided in light years (3.26 light years = 1 parsec)
Parameters for extrasolar planetary
systems are taken from the Extrasolar Planets Encyclopaedia (http://exoplanet.eu) and the
Catalog
of Nearby Exoplanets (http://exoplanets.org/).
M dwarf metallicities follow Schlaufman & Laughlin 2010.
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Last update July 2010