Tables 790-791 



TABLE 790.— The First-Magnitude Stars 



619 



Star 



R.A. 

 1900 



Dec. 

 1900 



Radial 



velocity 



km. 



Achernar. . . 

 Aldebarant. 

 Capellatt . • 

 Rigel*t. . . . 

 Betelgeusef 

 Canopus . . . 



Sirius* 



Procyon* . . 



Pollux § 



Regulust. . . 

 a Crucis*. . 

 Crucis f. . 



Spicat 



p Centaurif 

 Arcturus . . . 

 a Centauri* 

 Antarestt- • 



Vega § 



Altair§ 



Deneb§. . . . 

 Fomalhaut . 



34.O" 

 30.2 

 9-3 

 9-7 

 49.8 

 21.7 

 40.7 

 34-1 

 39-2 

 3-0 

 21.0 

 41.9 

 19.9 

 56.8 

 11. 1 

 32.8 

 23-3 

 33.6 

 45-9 

 38.0 

 52.1 



-57 45' 



+ 16 18 



+45 54 



- 8 19 

 + 7 23 

 -52 38 

 -16 35 

 + 5 29 

 +28 16 

 + 12 27 

 -62 33 

 -59 9 

 -10 38 

 -59 53 

 + 19 42 

 -60 25 



— 26 13 

 +38 41 

 + 8 36 

 +44 55 



+55-I 

 +30.2 

 + 22.6 

 + 21.3 

 + 20.8 



- 7-4 



- 3-5 

 + 3-9 



- 9.1 

 + 7-o 

 + 130 

 + 1.6 



- 7-o 



- 3-9 



- 21.6 



- 3-1 

 -13.8 

 -33-0 



- 4.0 

 + 6.7 



* Visual binary, t Spectroscopic binary, t Pair with common proper motion. § Wide pair probably optical 

 Mass relative to sun of (7) is 3.1; of (8), 1.5; of (16), 2.0. For description of types, see Table 787 or Annals of 

 Harvard College Observatory, 28, p . 146, or more concisely 56, p. 66, and 91, p. 5. The light ratio between suc- 

 cessive stellar magnitudes is V 100 or the number whose logarithm is 0.4000. viz., 2.512. The absolute magnitude 

 of a star is its magnitude reduced to a distance corresponding to 0.1" parallax = 5 +5 log ir. 



TABLE 791.— Stars Known to be Within Five Parsecs of the Sun 

 The number of stars (doubles counted as singles) per cubic parsec in the neighborhood 

 of the sun has been estimated as 0.0451 (Kapteyn, Van Rhijn, Astron. Journ., 52, 32, 1920). 

 This gives as expectance of 24 within 5 parsecs and 12 nearer than 4. The numbers actually 

 known are 28 and 19. It seems improbable that we should already know practically all 

 within these limits. (Van Maanen, Mt. Wilson, 1930.) See note bottom page 620. 

 See Luyten, Ann. Harvard Obs., 85, 1923, for stars within 10 parsecs. 



Star 



Parallax 



Abs. 

 mag. 



Spectrum Proper 

 class motion 



a Centauri A 



a " B 



a " C 



(Barnard's star) 



Wolf 359 



Lalande 21 185 



a Canis Majoris A 



a " " B 



Innes' star 



BD -i2°4523 



a Canis Minoris A 



a " " B 



t Ceti 



Zc 5h 243 



61 Cygni A 



" B 



t Eridani 



2 2398 A 



2 " B 



t Indi 



Groombr. 34 A 



" B 



Kriiger 60 A 



" B 



Lacaille 9352 



Van Maanen's star 



Lacaille 8760 



Gou 32416 



WB ioh 234 



Lalande 25372 



Oe Arg 17415-6 



Wolf 562 



Groombr. 1618 



BD +43°4305 



40 Eridani A 



•' BC 



a Aquilae 



Our sun 



.763 

 ■763 

 ■763 



• 538 

 .407 

 .380 

 .358 

 •358 



• 345 

 •327 

 .318 

 .318 

 .318 

 .310 

 .305 

 •305 

 .301 



• 293 



• 293 

 .280 

 .277 

 .277 

 .258 

 .258 

 .256 

 .256 

 .232 

 .220 

 .217 

 .213 

 .209 

 .209 

 .208 

 .208 

 .200 

 .200 



4-74 

 6.11 

 14.9 

 13-32 

 16.5 

 10.5 



1. 19 

 11. 21 

 14.69 



12. 1 

 2.99 



150 

 6.16 

 10.8 

 7-99 

 8.70 

 6.21 

 11. 7 

 12.4 

 7.08 

 10.19 

 1326 

 11-73 

 13.40 

 9.48 

 14-38 

 8.48 

 10.2 

 10.9 



11. 2 

 10.8 

 12.3 



8.41 



11. 1 

 6.0 



11. 2 

 2.37 



+ 4.85 



G6 



K4 



(M) 



Mb 



M4e 



Ma 



Ao 



(A) 



M5 

 F3 



G7 

 K2 



K 7 



K8 



Kl 



Mb 



(M) 



K 5 



Ma 



(M) 



Mb 



(M) 



Ma 



Fo 



Ma 



K5 



Mdp 



Mb 



Mb 



MS 



K6 



Mes 



G5 



A 



A5 



Go 



3-66 

 3.66 

 (3-66) 

 10.30 

 4.84 

 4-77 

 1.32 

 I.32 

 2.69 

 1.24 

 I.24 

 1.24 

 I.92 

 8.70 

 5.21 

 5.21 



• 97 

 2.28 

 2.28 

 4.67 

 2.8s 

 2.85 



•94 



.94 

 7.02 

 3.01 

 3-53 

 6.11 



.490 

 2.298 

 1.31 

 1-33 

 1. 45 1 



.86 

 4.082 

 4.027 



•65 



Smithsonian Tables 

 22 



