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0.9 The nearest stars, brown dwarfs, and white dwarfs

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The Nearest Stars, Brown Dwarfs, and White Dwarfs
Star System Discovery Name Distance (light-year) Spectral Type Location: RA Location (right ascension) given for Epoch 2000.0 Location: Dec Location (declination) given for Epoch 2000.0 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 White dwarf stellar remnant 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 White dwarf stellar remnant 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 Brown dwarf 22 04 −56 46 —
29 Epsilon Indi Bb 11.7 T6 Brown dwarf 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 Brown dwarf 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

Ayele, K., 2003. Introductory Economics, 3rd ed., Addis Ababa.
Widad Reply
can you send the book attached ?
Ariel
?
Ariel
What is economics
Widad Reply
the study of how humans make choices under conditions of scarcity
AI-Robot
U(x,y) = (x×y)1/2 find mu of x for y
Desalegn Reply
U(x,y) = (x×y)1/2 find mu of x for y
Desalegn
what is ecnomics
Jan Reply
this is the study of how the society manages it's scarce resources
Belonwu
what is macroeconomic
John Reply
macroeconomic is the branch of economics which studies actions, scale, activities and behaviour of the aggregate economy as a whole.
husaini
etc
husaini
difference between firm and industry
husaini Reply
what's the difference between a firm and an industry
Abdul
firm is the unit which transform inputs to output where as industry contain combination of firms with similar production 😅😅
Abdulraufu
Suppose the demand function that a firm faces shifted from Qd  120 3P to Qd  90  3P and the supply function has shifted from QS  20  2P to QS 10  2P . a) Find the effect of this change on price and quantity. b) Which of the changes in demand and supply is higher?
Toofiq Reply
explain standard reason why economic is a science
innocent Reply
factors influencing supply
Petrus Reply
what is economic.
Milan Reply
scares means__________________ends resources. unlimited
Jan
economics is a science that studies human behaviour as a relationship b/w ends and scares means which have alternative uses
Jan
calculate the profit maximizing for demand and supply
Zarshad Reply
Why qualify 28 supplies
Milan
what are explicit costs
Nomsa Reply
out-of-pocket costs for a firm, for example, payments for wages and salaries, rent, or materials
AI-Robot
concepts of supply in microeconomics
David Reply
economic overview notes
Amahle Reply
identify a demand and a supply curve
Salome Reply
i don't know
Parul
there's a difference
Aryan
Demand curve shows that how supply and others conditions affect on demand of a particular thing and what percent demand increase whith increase of supply of goods
Israr
Hi Sir please how do u calculate Cross elastic demand and income elastic demand?
Abari
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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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