Double star in Andromeda
Star hop chart
Almach is a colorful double star, with a bright yellow primary and a blue secondary component. Both of these stars are much larger and brighter than the Sun. The yellow star is a giant star 2000 times more luminous and 80 larger in diameter than our Sun.
The blue star itself is a close double, but its two components are very close (averaging 0.3 arcseconds as they orbit every 63 years). It would take a large telescope and excellent seeing conditions to split the two components of the blue star.
| Magnitudes | 2.2, 5.0 |
| Separation | 9.8" |
| Distance (light yrs) | 390 |
| Right Ascension | 2:03.9 |
| Declination | +42 20 |
| Field of View | 28' x 18' |
Image details: Five exposures each of 1/80, 1/20, 1/5, 1, and 4 seconds at ISO 12800, taken with a Canon T6i camera through a Meade 14” LX850 telescope at f/8.
November 2017