1876.] 
Sidereal Astronomy, 
73 
VII. Stellar Systems, of which the Orbits are Calculated . 
Amongst the thousands of multiple stars studied, there 
are only a very small number of which the observations are, 
on the one hand, sufficiently numerous, and the movements 
sufficiently rapid, in the next place, for it to be possible to 
determine the elements of their orbits. In order that our 
readers may understand the nature and the varieties of these 
orbits, we collect together here the systems which have, to 
the present time, been able to be calculated, writing 
them in order, increasing with their periods. As a rule, 
each of these orbits has been calculated by many astrono- 
mers, and the results have shown considerable divergence. 
The elements which we publish here are the last calcu- 
lated. The periods which are not absolutely sure are 
marked thus (±) — a 
Double Stars whose Oreits have been Calculated. 
Names. 
42 <§ Capella . . 
£ Hercules . . 
?d Northern Crown 
£ in Cancer J AB 
(tertiary system) 1 AC 
I Great Bear 
a in Centaur 
70 p. Ophiuchi . . 
4 in Scorpion 
y Austral Corona. . 
oj of the Lion 
3062? Cassiopeia.. 
4 of Bouvier. . 
y Virgo . . 
wj Cassiopeia 
<5 Cygni . . 
t Ophiuchi . , 
36 Ophiuchi . . 
2757 ? Virgo- •• •• 
VOL. VI. (N.S.) 
Magni- 
tude. 
6—6 
3—6 
5 ' 5 — 5 
5'5 — 7 
5\5— 1 6 
4— 5 
1 — 2 
4'9— 6 
5 — 5'3 
6 — 6 
9—7 
7- 8 
3—6 
3—3 
4 7’5 
3- 8 
5— 6 
4— 6 
8— 9 
Half- 
Major 
Axis. 
o-66" 
rig 
0- 86 
0*91 
5'°° 
2‘45 
15*50 
4*78 
I ‘20 
2-55 
1- 05 
1*00 
9*95 
3*38 
io*68 
r8o 
i‘ii 
4*°o 
2*00 
Periods. 
Years. 
2571 
34*57 
40*17 
58*80 
700 ± 
98*00 
100*00 
136*00 
*47 i 
169 ± 
175*00 
176*00 
240 ± 
Colours. 
White 
Reddish I 
yellow J 
Yellow 
White ) 
White f- 
& yell. J 
Golden 
yellow • 
& ashy 
White 
Yellow } 
and L 
rose ) 
White 
White 
Yellow 
” Yellow 
and j- 
olive j 
( Yellow ) 
j and j- 
{ orange j 
J Golden ) 
( yellow j 
Yellow \ 
and lilac J 
f Yellow 1 
•I & violet, J- Hind, 1S64 
(variable ) 
White 
J Red and 
( yellow 
/ White 
j and 
( yellow 
Calculators. 
O. Struve, 1875 
Flammarion, ’7^ 
Flammarion, ’74 
Flammarion, ’74 
Flammarion, ’73 
Powell, 1870 
Flammarion, ’74 
Flammarion, ’75 
Capt. Jacob, ’58 
Klinkerfues, 1870 
- Maelder, 1850 
• Hind, 1872 
Flammarion, ’74 
Duner, 1875 
Doberck, 1875 
Admiral Smyth, 
i860 
Admiral Smyth, 
i860 
