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| The Nearest Stars, Brown Dwarfs, and White Dwarfs |
| Star |
System |
Discovery Name |
Distance (light-year) |
Spectral Type |
Location: RA
|
Location: Dec
|
Luminosity (Sun = 1) |
|
|
Sun |
— |
G2 V |
— |
— |
1 |
| 1 |
1 |
Proxima Centauri |
4.2 |
M5.5 V |
14 29 |
−62 40 |
5 × 10
−5 |
| 2 |
2 |
Alpha Centauri A |
4.4 |
G2 V |
14 39 |
−60 50 |
1.5 |
| 3 |
|
Alpha Centauri B |
4.4 |
K2 IV |
14 39 |
−60 50 |
0.5 |
| 4 |
3 |
Barnard’s Star |
6.0 |
M4 V |
17 57 |
+04 42 |
4.4 × 10
−4 |
| 5 |
4 |
Wolf 359 |
7.8 |
M6 V |
10 56 |
+07 00 |
2 × 10
−5 |
| 6 |
5 |
Lalande 21 185 |
8.3 |
M2 V |
11 03 |
+35 58 |
5.7 × 10
−3 |
| 7 |
6 |
Sirius A |
8.6 |
A1 V |
06 45 |
−16 42 |
23.1 |
| 8 |
|
Sirius B |
8.6 |
DA2
|
06 45 |
−16 43 |
2.5 × 10
−3 |
| 9 |
7 |
Luyten 726-8 A |
8.7 |
M5.5 V |
01 39 |
−17 57 |
6 × 10
−5 |
| 10 |
|
Luyten 726-8 B (UV Ceti) |
8.7 |
M6 V |
01 39 |
−17 57 |
4 × 10
−5 |
| 11 |
8 |
Ross 154 |
9.7 |
M.05 V |
18 49 |
−23 50 |
5 × 10
−4 |
| 12 |
9 |
Ross 248 (HH Andromedae) |
10.3 |
M5.5 V |
23 41 |
+44 10 |
1.0 × 10
−4 |
| 13 |
10 |
Epsilon Eridani |
10.5 |
K2 V |
03 32 |
−09 27 |
0.29 |
| 14 |
11 |
Lacaille 9352 |
10.7 |
M0.5 V |
23 05 |
−35 51 |
0.011 |
| 15 |
12 |
Ross 128 (FI Virginis) |
10.9 |
M4 V |
11 47 |
+00 48 |
3.4 × 10
−4 |
| 16 |
13 |
Luyten 789-6 A (EZ Aquarii A) |
11.3 |
M5 V |
22 38 |
−15 17 |
5 × 10
−5 |
| 17 |
|
Luyten 789-6 B (EZ Aquarii B) |
11.3 |
M5.5 V |
22 38 |
−15 15 |
5 × 10
−5 |
| 18 |
|
Luyten 789-6 C (EZ Aquarii C) |
11.3 |
M6.5 V |
22 38 |
−15 17 |
2 × 10
−5 |
| 19 |
14 |
61 Cygni A |
11.4 |
K5 V |
21 06 |
+38 44 |
0.086 |
| 20 |
|
61 Cygni B |
11.4 |
K7 V |
21 06 |
+38 44 |
0.041 |
| 21 |
15 |
Procyon A |
11.4 |
F51V |
07 39 |
+05 13 |
7.38 |
| 22 |
|
Procyon B |
11.4 |
wd
|
07 39 |
+05 13 |
5.5 × 10
−4 |
| 23 |
16 |
Sigma 2398 A |
11.5 |
M3 V |
18 42 |
+59 37 |
0.003 |
| 24 |
|
Sigma 2398 B |
11.5 |
M3.5 V |
18 42 |
+59 37 |
1.4 × 10
−3 |
| 25 |
17 |
Groombridge 34 A (GX Andromedae) |
11.6 |
M1.5 V |
00 18 |
+44 01 |
6.4 × 10
−3 |
| 26 |
|
Groombridge 34 B (GQ Andromedae) |
11.6 |
M3.5 V |
00 18 |
+44 01 |
4.1 × 10
−4 |
| 27 |
18 |
Epsilon Indi A |
11.8 |
K5 V |
22 03 |
−56 46 |
0.150 |
| 28 |
|
Epsilon Indi Ba |
11.7 |
T1
|
22 04 |
−56 46 |
— |
| 29 |
|
Epsilon Indi Bb |
11.7 |
T6
|
22 04 |
−56 46 |
— |
| 30 |
19 |
G 51-15 (DX Cancri) |
11.8 |
M6.5 V |
08 29 |
+26 46 |
1 × 10
−5 |
| 31 |
20 |
Tau Ceti |
11.9 |
G8.5 V |
01 44 |
−15 56 |
0.458 |
| 32 |
21 |
Luyten 372-58 |
12.0 |
M5 V |
03 35 |
−44 30 |
7 × 10
−5 |
| 33 |
22 |
Luyten 725-32 (YZ Ceti) |
12.1 |
M4.5 V |
01 12 |
−16 59 |
1.8 × 10
−4 |
| 34 |
23 |
Luyten’s Star |
12.4 |
M3.5 V |
07 27 |
+05 13 |
1.4 × 10
−3 |
| 35 |
24 |
SCR J184-6357 A |
12.6 |
M8.5 V |
18 45 |
−63 57 |
1 × 10
−6 |
| 36 |
|
SCR J184-6357 B |
12.7 |
T6
|
18 45 |
−63 57 |
— |
| 37 |
25 |
Teegarden’s Star |
12.5 |
M6 V |
02 53 |
+16 52 |
1 × 10
−5 |
| 38 |
26 |
Kapteyn’s Star |
12.8 |
M1 V |
05 11 |
−45 01 |
3.8 × 10
−3 |
| 39 |
27 |
Lacaille 8760 (AX Microscopium) |
12.9 |
K7 V |
21 17 |
−38 52 |
0.029 |
Questions & Answers
define biology infour way
Explain the following terms .
(1) Abiotic factors in an ecosystem
Abiotic factors are non living components of ecosystem.These include physical and chemical elements like temperature,light,water,soil,air quality and oxygen etc
Qasim
passive process of transport of low-molecular weight material according to its concentration gradient
AI-Robot
what is production?
Catherine
how did the oxygen help a human being
how did the nutrition help the plants
Biology is a branch of Natural science which deals/About living Organism.
evolutionary history and relationship of an organism or group of organisms
AI-Robot
cell is the smallest unit of the humanity biologically
Abraham
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Source:
OpenStax, Astronomy. OpenStax CNX. Apr 12, 2017 Download for free at http://cnx.org/content/col11992/1.13
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