The constellation Draco features the double star Struve 2155, a notable yet subtle binary system situated about 600 light-years away. Comprising a bright yellow giant and a dimmer blue companion, this pairing offers a unique visual experience. Observers can appreciate the contrast and beauty of this hidden gem during summer evenings. Also known as: SAO 17410, HIP 84465, HD 156890, 4198-01479-1, BD+60 1742
Category Archives: Double/Multiple Stars
Struve 1677: A Close Pair of Stars Near Porrima in Virgo
Struve 1677 (STF 1677) is a double star in the spring constellation of Virgo. The binary stars are fairly close together but can be split with a telescope at 16 arc seconds apart. This double is also known as SAO 138952 or HIP 62234 and lies near Porrima.
24 Cancri (Struve 1224): A Quaint Triple Star in Cancer
24 Cancri, located in the spring constellation Cancer, is known as a triple star system, but backyard astronomers will only see a pair of nearly identical and pretty white-yellow stars, Learn more about the pair and see how they look through an 8-inch SLT scope. The pair is also known as 24 Cnc A, HD 71152, HR 3312, SAO 80184, STF 1224, Struve 1224, and upsilon.
Struve 2793: A Serene Double Star in Equuleus
The constellation Equuleus, known as the Little Horse, features the intriguing triple star system Struve 2793, discovered by Friedrich Georg Wilhelm von Struve in 1827. Despite its faintness, the system includes a bright primary star and a distant companion, offering rewarding views for patient astronomers during summer and early autumn.
Also cataloged as SAO 126783, HD 203943, HIP 105743, and STF 2793
OR Delphini (STF 2725): A Binary Star That Makes an Attractive Double-Double in Delphinus
OR Delphini, also known as Struve 2725, is a binary star in the constellation Delpinus. With a wider eyepiece, one can view this binary and the double star Gamma Delphini together, making a notable double-double that shouldn’t be missed.
The star is also known as Struve 2725, SAO 106466, HD 197913, HIP 102490, OR Del
17 Cygni (Struve 2580): A Pleasing Binary Star in the Swan’s Neck
The constellation Cygnus features the binary star 17 Cygni, located 69 light-years away. Composed of two stars, 17 Cygni A and B, it is faintly visible to the naked eye. This complex system, along with another binary pair, showcases intriguing dynamics reminiscent of a cosmic dance in the night sky. Also known as: SAO 68827, 17 Cyg, HR 7534, HD 187013, HIP 97295, STF 2580
61 Ophiuchi: A Nicely Resolvable Binary Star in Ophiuchus
The constellation Ophiuchus features the binary star 61 Ophiuchi, a bright pair visible through small telescopes. Discovered by Herschel in 1781, it is cataloged as STF 2202. The stars, classified as hot and white, exhibit an angular separation of 20.7 arcseconds, making them accessible and visually appealing to amateur astronomers. Also known as 61 Oph, Struve 2202, STF 2202, SAO 122690, HD 161270, HR 6609, HIP 86831
Struve 2007: Exploring the Colorful Double in Serpens
Struve 2007 (STF 2007) is a double star in Serpens Caput, first documented in 1823. The closer AB pair features a yellowish-white primary and a blue secondary, while an AC component forms a wider triple. It’s visually appealing and accessible for telescopic observation, particularly noted for its striking colors and separation. Also known as SAO 101922, HD 144563, HIP 78873, STF 2007.
The Garden Astronomer 