Author Archives: Wayne McGraw

Struve 2404: A Tight, Attractive Orange-Red and Yellow Double in Aquila

Struve 2404 is a tight attractive double star in the summer constellation of Aquila, which lies on the celestial equator. The Russian astronomer Otto Wilhelm von Struve first recorded an observation of this pair in 1822.

This pair features a magnitude +6.9 primary star with a beautiful warm orange hue. The orange-red giant star has a stellar classification of K5III and is nearly 60 times the diameter of our sun! The secondary star lies closely by at 3.6 arcseconds away and shines at a magnitude of +7.8. The pair also known as STF 2404, HD 174569, SAO 104170, HR 7099.

NGC 6709: An 8-Bit Game Character in Aquila’s Star Cluster

NGC 6709 is located in the constellation Aquila (the Eagle) best viewed on late summer and early autumn nights. This congregation of stars was first documented by the renowned astronomer William Herschel in 1784. One may not find much written about the cluster, but this fact doesn’t diminish its attractiveness. Approximately 300 stars make upContinueContinue reading “NGC 6709: An 8-Bit Game Character in Aquila’s Star Cluster”

Epsilon Sagittae: A Warm Yellow and Pale Blue Double Star in Sagitta

On August 19, 1780, astronomer William Herschel discovered Epsilon Sagittae, a double star in the Sagitta constellation. It features a visible primary star with a magnitude of +5.7 and a fainter companion. Best viewed in summer, this pair showcases a golden-yellow and blue hue contrast for observers using binoculars or telescopes. Also known as SAO 105061, HD 185194, 4 Sagittae, Eps Sge, HIP 96516, HR 7463, H VI 26.

Messier 71 (NGC 6838): A Globular Cluster Close to Home

Globular clusters like Messier 71 (M71) make for great targets. With a pair of binoculars away from bright city lights, an observer can see M71 as a fuzzy patch. Move up to the telescope (say 4 inches in diameter and larger), and you can start to make out some individual stars. For a long time,ContinueContinue reading “Messier 71 (NGC 6838): A Globular Cluster Close to Home”

Struve 2742: A Challenging, Yet Rewarding Binary in Equuleus

Struve 2742 is a binary star in Equuleus, first noted in the 19th century. Best viewed in late summer and autumn, it features two stars 3 arcseconds apart, requiring at least a 6-inch telescope for a clear view. With magnitudes of +7.4 and +7.6, it’s a rewarding target for amateur astronomers. Article includes a drawing of the binary also known as SAO 126482, HD 200256, HIP 103813, 2 Equulei, Lam Equ, λ Equ

Epsilon Equulei (Struve 2737): A Quaint Star System of Yellow and Violet in Equuleus

The delicate and pretty magnitude 5 triple star Epsilon Equulei shines down from the constellation Equuleus on late summer and autumn nights. Learn more about this pretty star and see what it looks like through a backyard telescope.

Struve 2690 (15 Delphini): A Quaint Multiple Star System in the Dolphin’s Tail

15 Delphini, also known as Struve 2690, is a multiple-star system that is visible during late summer and autumn nights. Most observers will see a quaint pair of equally bright stars in the tail of the constellation Delphinus, but more star lurk nearby!