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List of Easy Double Stars for Summer and Autumn  = Easy  = Not Too Difficult  = Difficult but Possible

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List of Easy Double Stars for Summer and Autumn  = Easy  = Not Too Difficult  = Difficult but Possible List of Easy Double Stars for Summer and Autumn = easy = not too difficult = difficult but possible 1. Alpha Librae (Zubenelgenubi, SHJ 186). 14 hr 50.9 min -16 deg 03 min A pair of bright stars which are extremely wide. Primary: 2.7, yellow Secondary: 5.2 (231.1″), white 2. Delta Serpentis (STF 1954). 15 hr 34.8 min +10 deg 32 min Although it is fairly tight, it is relatively easy to split in practice with a high magnification. It is in the head (Caput) of the Serpent. Primary: 4.2, yellow Secondary: 5.2 (3.9″), yellow 3. STF 1962 in Libra. 15 hr 38.7 min -08 deg 47 min A nicely wide pair of equally bright stars. Primary: 6.4, yellow. Secondary: 6.5 (11.7″), yellow. 4. Psi Serpentis (A 2230). 15 hr 44.0 min +02 deg 31 min Two bright stars with a faint but very clear star between them, somewhat closer to the brighter of the two (which is ψ Ser) and all almost in a line. Primary: 6.2, yellow-white Secondary: 9.2 (193.6″), white Secondary: 7.3 (172.8″ from B) 5. Xi Scorpii (STF 1998). 16 hr 04.4 min -11 deg 22 min A wonderful sight, two doubles as it is in same field as STF 1999. Primary: 5.2, yellow. Secondary: 7.3 (6.9″), blue. 6. STF 1999 in Scorpius. 16 hr 04.4 min -11 deg 27 min Primary: 7.5, yellow. Secondary: 8.1 (11.6″), yellow. 7. Beta Scorpii (Graffias, H III 7). 16 hr 05.4 min -19 deg 48 min A nicely wide pairing of a bright star and a fainter but still fairly bright star. Rather low. Primary: 2.6, white. Secondary: 4.5 (13.6″), blue. 8. Omega Scorpii (no designation). 16 hr 06.8 min -20 deg 40 min A super-wide pair of bright stars, but rather low. Primary: 3.9, white. Secondary 4.3 (877.3″), white. 9. Kappa Herculis (Marfik, STF 2010) 16 hr 08.1 min +17 hr 03 min A nice wide easy coloured double. Mistakenly called Maasym in the Celestron handset. Primary: 5.1, yellow. Secondary: 6.2 (27.0″), blue. 1 10. Nu Scorpi (Jabbah, H V 6 and BU 120). 16 hr 12.0 min -19 deg 28 min & A more challenging version of the famous double-double in Lyra. The wide pair is easy, but splitting these two stars is difficult and will require at least 5″ aperture. The secondaries take the colours of their primaries. Primary (1): 4.4, white. Secondary (1): 5.3 (1.2″). Primary (2): 6.6 (41.2″ from Primary 1), white or red. Secondary (2): 7.2 (2.2″). 11. 17/16 Draconis (STFA 30/STF 2078). 16 hr 36.2 min +52 deg 55 min & The two main stars 17 and 16 Draconis are an easy bright pair. 17 Draconis can be split, but will require a higher magnification as it is fairly tight. 17 Dra: 5.4, white or yellow-white. 16 Dra (C): 5.5 (90.1″), white. 17 Dra B: 6.4 (3.1″), white or yellow-white. 12. 36-37 Herculis (STFA 31). 16 hr 40.6 min +04 deg 13 min Primary: 5.8, white. Secondary: 6.9 (69.3″), blue or yellow. 13. Mu Draconis (Arrakis, STF 2130). 17 hr 05.3 min +54 deg 28 min This tight equal double requires a high magnification (at least 150x). It is the planet that is called Arrakis in Frank Herbert’s Dune series, which circled the bright southern star Canopus. Primary: 5.7, yellow. Secondary: 5.7 (2.5″), yellow. 14. Alpha Herculis (Rasalgethi, STF 2140). 17 hr 14.6 min +14 deg 23 min A colourful pair, the main star is actually variable. Primary: 3.5 (act. 3.1-3.9), yellow. Secondary: 5.4 (4.6″), blue or green (or red). 15. 36 Ophichui (SHJ 243). 17 hr 15.3 min -26 deg 36 min Rather low in British skies. Primary: 5.1, yellow. Secondary: 5.1 (4.9″), yellow. 16. Omicron (39) Ophichui (H III 25). 17 hr 18.0 min -24 deg 17 min Again rather low for Havering, but nice if it can be seen clearly. Described by Revd Thomas Webb as beautiful. Primary: 5.2, yellow or orange. Secondary: 6.6 (10.3″), blue or blue-white. 17. Rho Herculis (STF 2161). 17 hr 23.7 min +37 deg 09 min Primary: 4.5, yellow or bluish white. Secondary: 5.4 (3.9″), white or greenish-white. 2 18. Nu Draconis (Kuma, STFA 35). 17 hr 32.2 min +55 deg 11 min Bright extremely wide equal double, sometimes described as car headlights in a barren sky. Primary: 4.9, yellow-white or white. Secondary: 4.9 (63.4″), yellow-white or white. 19. Psi Draconis (Dziban, STF 2241). 17 hr 41.9 min +72 deg 09 min Primary: 4.6, yellow. Secondary: 5.6 (30.0″), yellow. 20. 61 Ophichui (STF 2202). 17 hr 44.6 min +02 deg 35 min Primary: 6.1, white (or yellow). Secondary: 6.5 (20.5″), white (or yellow). 21. Mu Herculis (STF 2220). 17 hr 46.5 +27 deg 43 min It is difficult to the faint red star through the glare of the main star, but I have included it as the secondary is actually a pair of red dwarfs, but difficult to split as the gap is only 1.1″. Primary: 3.5, yellow. Secondary: 9.8, red (or purple). 22. 40/41 Draconis (STF 2308). 18 hr 00.2 min +80 deg 00 min One of the northernmost doubles. Primary: 5.7, yellow. Secondary: 6.0 (18.7″), yellow. 23. 95 Herculis (STF 2264). 18 hr 01.5 min +21 deg 36 min Primary: 4.9, yellow or white. Secondary: 5.2 (6.3″), yellow. 24. 70 Ophichui (STF 2272). 18 hr 05.5 min +02 deg 30 min A very colourful pair. Primary: 4.2, yellow or orange. Secondary: 6.2 (6.2″), orange or red. 25. 100 Herculis (STF 2280). 18 hr 07.8 min +26 deg 06 min Wide, bright and equal. Primary: 5.2, white. Secondary: 5.2 (14.2″), white. 26. Epsilon Lyrae (STF 2382 & STF 2383). 18 hr 44.3 min 39 deg 40 min & The famous “Double-Double”. An extremely wide pair (STFA 37), visible in the finderscope, but the two main stars can only be split with difficulty, use a high magnification. The position angles are at right angles to each other. All the stars are white with a yellowish-green tint. Primary (1): 4.7, white. Primary (2): 4.6 (207.9″), white. Primary (1): 5.2 (dimmer because the light from B is not included). Secondary (1): 6.1 (2.3″). Primary (2): 5.3. Secondary (2): 5.4 (2.4″). 3 27. Zeta Lyrae (STFA 38). 18 hr 44.8 min +37 deg 36 min Primary: 4.3, yellow. Secondary: 5.6 (41.1″). 28. 5 Aquilae (STF 2379). 18 hr 46.5 min -00 deg 58 min Primary: 5.9, yellow-white or white. Secondary: 7.0 (12.6″), blue. 29. STF 2391 in Scutum. 18 hr 48.7 -06 deg 00 min Mentioned only because it is the same field as H 6 50, but still worth seeing. It is also near the Wild Duck Cluster (M11). Primary: 6.5, yellow. Secondary: 9.6 (38.0″), purple or turquoise. 30. H 6 50 in Scutum. 18 hr 49.7 min -05 deg 55 min Primary: 6.2, orange. Secondary: 8.2 (110.6″), white. 31. STT 525 in Lyra. 18 hr 54.9 min +33 deg 58 min & The AB pair is very unequal and tight, thus very difficult. The AB-C pair is easy. Primary: 6.1, yellow. Secondary (B): 9.1 (1.8″). Secondary (C): 7.6 (45.2″), blue. 32. 15 Aquilae (SHJ 286). 19 hr 05.0 min -04 deg 02 min Primary: 5.5, yellow. Secondary: 7.0, blue. 33. STF 2470 and STF 2474 in Lyra. The unknown double-double in Lyra. A brilliant double-double pair, wider than ε Lyrae and more colourful, but dimmer. The position angles are exactly the same and separations are exactly the same, and the brightness almost exactly the same, weird! 34. STF 2470: 19hr 08.8 min +34 deg 46 min Primary: 7.0, white. Secondary: 8.4 (13.8″), blue. 35. STF 2474: 19 hr 09.1 min +34 deg 36 min Primary: 6.8, yellow. Secondary: 7.9 (15.9″), blue. 36. Theta Serpentis (Alya, STF 2417). 18 hr 56.2 min +04 deg 12 min A wonderful sight, almost the equal of Albireo. Two white stars wide apart with tantalising tints, which I see as greenish and bluish. One of my favourites. In the tail (Cauda) of the Serpent. Primary: 4.6, white. Secondary: 4.9, white (22.3″). 4 37. STF 2486 in Cygnus. 19 hr 12.1 min +49 deg 51 min Primary: 6.5, yellow. Secondary: 6.7 (7.2″), yellow. 38. Alpha Vulpeculae (Anser, STFA 42). 19 hr 28.7 min +24 deg 40 min The name of Alpha Vulpeculae is a relic of the original name of the constellation created by Johannes Hevelius, Vulpecula et Anser (the Little Fox and Goose, the goose being in the fox’s mouth). This extremely wide pair is an easy finderscope object. Primary: 4.6, dark yellow or white. Secondary (8 Vul): 5.9 (426.6″), white or pale yellow.
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