Test Double Stars

The following list is only approximate, as again so much depends upon the observer as well as upon the precise conditions, but it may be useful as a rough guide.

Apertures

of O.G.

Star

Magnitudes

Separation

Position angle

inches

secs. of arc

degree

1

Acrux

1.4,

1.9

4.7

119

Alpha Herculis

var.,

5.4

4.5

109

2

Rigel

0.1,

6.7

9.5

202

Gamma Leonis

2.3,

3.5

4.3

122

Epsilon Boötis

2.4,

5.0

2.8

334

3

Polaris

2.0,

8.9

18.3

21 7

Theta Virginis

4.0,

9.0

7.2

343

4

Theta Aurigae

2.7,

7.1

2.8

332

Eta Orionis

3.8,

4.8

1.4

079

Delta Cygni

2.9,

6.4

2.1

240

Iota Ursae Majoris

3.1,

10.8

7.4

002

5

Zeta Boötis

4.6,

4.6

1.2

309

Omega Leonis

5.9,

6.7

1.0

129

8

Lambda Cassiopeiae

5.5,

5.8

0.6

180

*Gamma2 Andromedae

5.4,

6.6

0.7

109

9

Eta Coronae Borealis

5.7,

5.9

0.7

069

*Gamma2 Andromedae is the smaller component of the easy double Gamma

Andromedae.

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