Category Archives: Double/Multiple Stars

HD 39881 (S 503): A Wide Double Star in Orion

Orion is a prominent winter constellation known for its bright stars, including Betelgeuse and the Orion Nebula, as well as double stars like S 503. This system, consisting of components A and B, offers viewing opportunities with binoculars and telescopes. Recent observations highlighted their visibility despite fading dawn light. Also known as SAO 95004, HD 39881, HR 2067, HIP 28066, BD+13 1036, GC 7469, 0728-03142-1

Eta Boötis (Muphrid): The Double Star Neighbor Beside Arcturus

Eta Boötis, known as Muphrid, is a subgiant star roughly 37 light-years from Earth, overshadowed by the brighter Arcturus. Muphrid shines with a magnitude of 2.7 and is accompanied by a fainter companion star. Observations reveal challenges in identifying its companions, highlighting its unique charm in the spring sky. η Boötis, HR 5235, HD 121370, HIP 67848, SAO 100766, BD+18°2759, SHJ 169

Struve 2540 (HD 184360): A Tight Pair Near the Coathanger Asterism

Struve 2540 (HD 184360) is a triple star system in the constellation Vulpecula. The stars lie in the popular Brocchi’s Cluster, nicknamed the Coat Hanger.

STF 2540 may be a tight pair to view under light-polluted stars, but astronomers will appeciate the view as the double floats among a pretty background of faint stars.

Xi Serpentis (Nehushtan): A Triple Star in Serpens

Nehushtan, or Xi Serpentis, is a triple star system in the Serpens constellation, 105 light-years away. It will approach within 27 light-years in about 700,000 years. Named after a biblical idol, it showcases the intertwining of astronomy and faith. Observations highlight its brightness and challenging visibility of companions. Also known as 55 Ser, Xi Ser, SAO 160700, HD 159876, HIP 86263, HR 6561, GC 23881