The Astronomical League's Double Star Observing Program features 100 of the finest double and multiple star systems in the heavens. The list progresses through the sky by right ascension, offering a year-round tour of colorful pairs, challenging splits, and famous multiple systems. Any telescope 60mm or larger can complete the program. Stars range from wide naked-eye pairs to tight sub-3" challenges requiring steady seeing.
게시자 Skybred 공개일 March 13, 2026
100
전체 천체
목록 내 천체
| Select | 천체 | 작업 |
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Fulu
HIP 2920; Zeta Cas; 17 Cas
Fulu
A beautiful color-contrast pair — golden primary with an orange-red dwarf companion at 13.4". Mags 3.5 + 7.4. One of the nearest Sun-like star systems at 19 light-years.
DoubleStar · Cas · Mag 3.5
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65 Psc
HIP 3885; 65 Psc
A neat equal pair of white stars at 4.4" separation. Mags 6.3 + 6.3. A satisfying split at moderate magnification.
DoubleStar · Psc · Mag 6.3
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Psi Psc
HIP 5131; Psi1 Psc; 74 Psc
Psi Psc
A wide, easy pair of nearly equal white stars at 29.8" separation. Mags 5.3 + 5.5. Splits cleanly at low power.
DoubleStar · Psc · Mag 5.3
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Revati
HIP 5737; Zeta Psc; 86 Psc
Revati
A wide pair with a subtle color difference at 22.8" separation. Mags 5.2 + 6.3. Easy split in any telescope.
DoubleStar · Psc · Mag 5.2
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Mesarthim
HIP 8832; Gamma2 Ari; 5 Ari
Mesarthim
Mesarthim — one of the first doubles discovered telescopically (by Robert Hooke, 1664). Equal white pair at 7.4". Mags 4.5 + 4.6.
DoubleStar · Ari · Mag 4.5
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Lambda Ari
HIP 9153; Lambda Ari; 9 Ari
A wide, unequal pair at 37.3" separation. Mags 4.8 + 6.7. The bright primary is a white star with a fainter companion. Easy at low power.
DoubleStar · Ari · Mag 4.8
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Alrescha
HIP 9487; Alpha Psc; 113 Psc
Alrescha
Alrescha — a tight pair requiring steady seeing and moderate magnification to split at 1.9". Mags 4.1 + 5.2. Both stars are blue-white. The knot tying the Fishes.
DoubleStar · Psc · Mag 4.1
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Almaak
HIP 9640; Gamma1 And; 57 And
Almaak
Almach — a gorgeous color-contrast double, often called the autumn Albireo. Orange primary with blue-green companion at 9.6". Mags 2.3 + 5.0.
DoubleStar · And · Mag 2.3
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6 Tri
HIP 10280; 6 Tri
A close pair requiring moderate magnification at 4.0" separation. Mags 5.3 + 6.7. A yellow-white primary with a blue companion.
DoubleStar · Tri · Mag 5.3
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Polaris
HIP 11767; Alpha UMi; 1 UMi
Polaris
Polaris — the North Star has a mag 9.1 companion at 18.4". The faint companion appears blue-white against the slightly yellow primary. Always above the horizon.
DoubleStar · UMi · Mag 2.0
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Kaffaljidhma
HIP 12706; Gamma Cet; 86 Cet
Kaffaljidhma
A tight, challenging pair at just 2.0" separation. Mags 3.5 + 6.2. Needs good seeing and 150x+. The bright primary overwhelms the faint secondary.
DoubleStar · Cet · Mag 3.5
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Theta Per
HIP 12777; Theta Per; 13 Per
A wide, high-contrast pair at 28.7" separation. Mags 3.8 + 8.5. The bright orange primary dominates a tiny blue companion.
DoubleStar · Per · Mag 3.8
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Struve 331
Struve 331
A Struve catalog double in Cassiopeia — a neat pair at 12.0" separation. Mags 5.2 + 6.2. Easy to split at moderate magnification.
DoubleStar · Cas · Mag 5.2
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32 Eri
HIP 18255; 32 Eri
A fine color-contrast pair — topaz primary with emerald companion at 6.9". Mags 4.8 + 5.9. One of the best colored doubles in the winter sky.
DoubleStar · Eri · Mag 4.8
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Chi Tau
HIP 20430; Chi Tau; 59 Tau
A wide pair at 19.4" with a large magnitude difference. Mags 5.4 + 8.5. Near the Hyades star cluster. The primary is blue-white.
DoubleStar · Tau · Mag 5.4
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51 Cam
HIP 37949; 51 Cam
A neat pair in the far north at 10.4" separation. Mags 5.8 + 6.8. A fine double in an often-overlooked constellation.
DoubleStar · Cam · Mag 5.8
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55 Eri
HIP 21986; 55 Eri
A near-equal pair of faint stars at 9.3" separation. Mags 6.7 + 6.8. Both white. A satisfying close match.
DoubleStar · Eri · Mag 6.7
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Rigel
HIP 24436; Beta Ori; 19 Ori
Rigel
Rigel — the brilliant blue-white supergiant has a faint companion at 9.7". Mags 0.3 + 6.8. The glare of Rigel makes the companion a nice challenge. Best at 150x+.
DoubleStar · Ori · Mag 0.3
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118 Tau
HIP 25695; 118 Tau
A moderately close pair at 4.6" separation. Mags 5.8 + 6.7. Both white. A fine double in the Taurus-Auriga border region.
DoubleStar · Tau · Mag 5.8
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Mintaka
HIP 25930; Delta Ori; 34 Ori
Mintaka
Mintaka — the westernmost Belt star has a wide companion at 56.2". Mags 2.4 + 6.8. The primary is itself a spectroscopic binary.
DoubleStar · Ori · Mag 2.4
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Struve 747
Struve 747
A wide Struve pair south of the Belt. Mags 4.7 + 5.5 at 36.3" separation. Both blue-white stars in the Orion Nebula region.
DoubleStar · Ori · Mag 4.7
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Meissa
HIP 26207; Lambda Ori; 39 Ori
Meissa
Meissa — a tight pair at 4.3" requiring moderate magnification. Mags 3.5 + 5.5. The head of Orion. Near the Lambda Orionis ring.
DoubleStar · Ori · Mag 3.5
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Theta Ori
HIP 26221; Theta1 Ori; 41 Ori
Theta Ori
The Trapezium — the famous quadruple at the heart of the Orion Nebula. Four stars (A-D) from mags 5.1 to 7.5. E and F components visible in larger aperture. One of the sky's greatest sights.
DoubleStar · Ori · Mag 6.6
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Nair al Saif
HIP 26241; Iota Ori; 44 Ori
Nair al Saif
Nair al Saif — a bright pair at 12.5" separation. Mags 2.8 + 7.7. Located at the tip of Orion's sword, immersed in nebulosity.
DoubleStar · Ori · Mag 2.8
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Theta Ori
HIP 26235; Theta2 Ori; 43 Ori
Theta Ori
A wide pair at 52.3" separation. Mags 5.0 + 6.2. Located just north of the Trapezium. Easy to split.
DoubleStar · Ori · Mag 5.0
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Sigma Ori
HIP 26549; Sigma Ori; 48 Ori
A stunning multiple star system — the main pair at 12.9" with additional components at various separations. Mags 3.8 + 6.3 + 6.6. A showcase multiple star.
DoubleStar · Ori · Mag 3.8
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Alnitak
HIP 26727; Zeta Ori; 50 Ori
Alnitak
Alnitak — the eastern Belt star has a close companion at just 2.4". Mags 1.9 + 3.7. A challenging split due to the tight separation and glare. Near the Flame Nebula.
DoubleStar · Ori · Mag 1.9
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Gamma Lep
HIP 27072; Gamma Lep; 13 Lep
A very wide pair at 95.5" — nearly optical. Mags 3.6 + 6.3. The primary is a warm yellow star; best in binoculars or finder.
DoubleStar · Lep · Mag 3.6
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Mahasim
HIP 28380; Theta Aur; 37 Aur
Mahasim
A challenging close pair at 4.2" separation. Mags 2.6 + 7.2. The bright primary overwhelms the faint companion. Needs high magnification and steady seeing.
DoubleStar · Aur · Mag 2.6
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Epsilon Mon
HIP 30419; Epsilon Mon; 8 Mon
A neat pair at 12.2" separation. Mags 4.4 + 6.6. The brighter component is a yellow giant.
DoubleStar · Mon · Mag 4.4
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Beta Mon
HIP 30867; Beta Mon; 11 Mon
Beta Mon
One of the finest triple stars in the sky — three blue-white stars in a gentle curve. Mags 4.6, 5.0, 5.4. William Herschel called it 'one of the most beautiful sights in the heavens.'
DoubleStar · Mon · Mag 4.6
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12 Lyn
HIP 32438; 12 Lyn
A close pair at 8.9" with a wider third component. Mags 5.4 + 7.1. One of the nicest doubles in Lynx.
DoubleStar · Lyn · Mag 5.4
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Adara
HIP 33579; Epsilon CMa; 21 CMa
Adara
Adhara — a very bright star with a faint companion at 7.9". Mags 1.5 + 7.5. Low declination but a rewarding split when the glare is managed.
DoubleStar · CMa · Mag 1.5
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Wasat
HIP 35550; Delta Gem; 55 Gem
Wasat
Wasat — a moderately close pair at 5.5". Mags 3.6 + 8.2. Significant brightness difference makes this a good test of aperture and seeing.
DoubleStar · Gem · Mag 3.6
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19 Lyn
HIP 35785; 19 Lyn
A pair at 13.8" separation in Lynx. Mags 5.8 + 6.7. Near-equal brightness makes for a pleasing sight.
DoubleStar · Lyn · Mag 5.8
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Castor
HIP 36850; Alpha Gem; 66 Gem
Castor
Castor — a classic bright double of white stars at 5.5" separation. Mags 1.9 + 3.0. Actually a sextuple system. One of the finest doubles in the sky.
DoubleStar · Gem · Mag 1.9
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HIP 37229
HIP 37229
A near-equal pair at 9.9" separation. Mags 4.4 + 4.6. Both blue-white stars. Low declination for northern observers.
DoubleStar · Pup · Mag 4.4
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Tegmine
HIP 40167; Zeta1 Cnc; 16 Cnc
Tegmine
A close pair at 6.2" that is actually a hierarchical triple system. Mags 5.3 + 5.9. The brighter component is itself a tight binary resolvable in large aperture.
DoubleStar · Cnc · Mag 5.3
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Iota Cnc
HIP 43103; Iota Cnc; 48 Cnc
Iota Cnc
A gorgeous color-contrast double — golden yellow primary with blue companion at 30.7". Mags 4.1 + 6.0. Often compared to Albireo. One of the finest spring doubles.
DoubleStar · Cnc · Mag 4.1
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38 Lyn
HIP 45688; 38 Lyn
A tight, challenging pair at just 2.6" separation. Mags 3.9 + 6.1. Needs steady seeing and 200x+ to cleanly split. A good test of optics.
DoubleStar · Lyn · Mag 3.9
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Regulus
HIP 49669; Alpha Leo; 32 Leo
Regulus
Regulus — the Lion's heart has a very wide companion at 179.2". Mags 1.4 + 8.2. The companion is visible in a finder or binoculars, blue-white.
DoubleStar · Leo · Mag 1.4
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Algieba
HIP 50583; Gamma1 Leo; 41 Leo
Algieba
Algieba — a glorious gold-on-gold double, two orange-yellow giants at 4.7" separation. Mags 2.4 + 3.6. One of the finest double stars in the sky. Best at 150x+.
DoubleStar · Leo · Mag 2.4
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54 Leo
HIP 53417; 54 Leo
A close pair at 6.8" separation. Mags 4.5 + 6.3. A white primary with a fainter companion. Pleasant at moderate magnification.
DoubleStar · Leo · Mag 4.5
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Ashlesha
HIP 43109; Epsilon Hya; 11 Hya
Ashlesha
A near-equal pair at 9.6" separation. Mags 5.6 + 5.7. Also known as 17 Crateris. Both yellow-white stars.
DoubleStar · Hya · Mag 5.6
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Algorab
HIP 60965; Delta Crv; 7 Crv
Algorab
Algorab — a wide pair at 24.2" with a large magnitude difference. Mags 2.9 + 8.5. The faint companion may show a slight reddish tint.
DoubleStar · Crv · Mag 2.9
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24 Com
HIP 61418; 24 Com
A lovely color-contrast pair — orange primary with blue-white companion at 20.2". Mags 5.1 + 6.3. One of the best colored doubles in spring.
DoubleStar · Com · Mag 5.1
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Porrima
HIP 61941; Gamma Vir; 29 Vir
Porrima
Porrima — a near-identical white pair with a 169-year orbit. Currently widening to about 3" separation. Mags 3.5 + 3.5. A fine test of optics and seeing.
DoubleStar · Vir · Mag 3.5
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32 Camelopardalis
32 Camelopardalis
A wide pair at 21.8" near the north celestial pole. Mags 5.3 + 5.7. Nearly equal white stars. A good circumpolar double.
DoubleStar · Cam · Mag 5.3
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Alpha CVn (HIP 63125)
HIP 63125; Alpha2 CVn; 12 CVn
COR CAROLI
Cor Caroli — 'Heart of Charles.' A wide pair at 19.5" separation. Mags 2.9 + 5.5. Subtle white and lilac color. The primary is the prototype magnetic Ap variable star.
DoubleStar · CVn · Mag 2.9
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Mizar
HIP 65378; Zeta UMa; 79 UMa
Mizar
Mizar — the famous double in the Big Dipper's handle at 14.6". Mags 2.2 + 3.9. Alcor sits 707" away. The first double star photographed (1857). First known telescopic double (1617).
DoubleStar · UMa · Mag 2.2
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Kappa Boo
HIP 69483; Kappa2 Boo; 17 Boo
Kappa Boo
A wide pair at 13.8" separation. Mags 4.5 + 6.6. Both white. A fine easy double near the Big Dipper's handle.
DoubleStar · Boo · Mag 4.5
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Iota Boo
HIP 69713; Iota Boo; 21 Boo
A very wide pair at 39.0" separation. Mags 4.8 + 7.4. Easy split at any magnification.
DoubleStar · Boo · Mag 4.8
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Pi Boo
HIP 71762; Pi Boo; 29 Boo
Pi Boo
A close pair at 5.4" separation. Mags 4.9 + 5.8. Both blue-white stars. Needs moderate magnification.
DoubleStar · Boo · Mag 4.9
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Izar
HIP 72105; Epsilon Boo; 36 Boo
Izar
Izar (Pulcherrima) — Struve called it 'the most beautiful.' Orange primary with blue-green companion at 2.8". Mags 2.6 + 4.8. Needs 150x+ and steady seeing. Magnificent when resolved.
DoubleStar · Boo · Mag 2.6
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Alpha Lib
HIP 72603; Alpha1 Lib; 8 Lib
Alpha Lib
Zubenelgenubi — an extremely wide pair at 231", visible to the naked eye. Mags 2.7 + 5.2. Both white. A binocular double. The companion has its own double nature.
DoubleStar · Lib · Mag 2.7
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Xi Boo
HIP 72659; Xi Boo; 37 Boo
A close pair at 5.2" separation. Mags 4.8 + 7.0. Yellow primary with orange companion. A rapid binary with a 152-year period.
DoubleStar · Boo · Mag 4.8
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Delta Boo
HIP 74666; Delta Boo; 49 Boo
A very wide pair at 105" separation. Mags 3.6 + 7.9. The primary is yellow; the faint companion is visible in a finder.
DoubleStar · Boo · Mag 3.6
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Alkalurops
HIP 75411; Mu Boo; 51 Boo
Alkalurops
A wide pair at 109" with a sub-pair (Boötis). Mags 4.3 + 7.1. The fainter component is itself a tight double (Struve 1938AB at 2").
DoubleStar · Boo · Mag 4.3
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Delta Ser
HIP 76276; Delta Ser; 13 Ser
Delta Ser
A tight pair at 4.0" separation. Mags 4.2 + 5.2. Both white. Needs moderate magnification.
DoubleStar · Ser · Mag 4.2
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Zeta CrB
HIP 76669; Zeta2 CrB; 7 CrB
Zeta CrB
A close pair at 6.3" separation. Mags 5.0 + 5.9. Both blue-white stars in the Northern Crown. A 41-year binary.
DoubleStar · CrB · Mag 5.0
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Xi Sco
HIP 78738; Xi Sco
Xi Sco
A moderately close pair at 7.2" separation. Mags 4.8 + 7.3. Yellow primary with a fainter companion. Part of a complex multiple system with Struve 1999 nearby.
DoubleStar · Sco · Mag 4.8
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Struve 1999
Struve 1999
The companion pair to Xi Scorpii — at 11.9" separation. Mags 7.4 + 8.0. Located just 5' south of Xi Sco. The two systems form a remarkable visual quadruple.
DoubleStar · Sco · Mag 7.4
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Graffias
HIP 78820; Beta1 Sco; 8 Sco
Graffias
Acrab — a fine pair at 13.4" separation. Mags 2.6 + 4.5. Both blue-white. A showcase double in Scorpius.
DoubleStar · Sco · Mag 2.6
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Marsic
HIP 79043; Kappa Her; 7 Her
Marsic
A wide, easy pair at 27.0" separation. Mags 5.1 + 6.2. Both white. Near the Keystone asterism.
DoubleStar · Her · Mag 5.1
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Jabbah
HIP 79374; Nu Sco; 14 Sco
Jabbah
A wide pair at 41.3" that is actually a complex quintuple system. Mags 4.4 + 6.6. Careful observation reveals additional components.
DoubleStar · Sco · Mag 4.4
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Sigma CrB
HIP 79607; Sigma CrB; 17 CrB
Sigma CrB
A close pair at 7.2" separation. Mags 5.6 + 6.5. Both yellow. A near-equal binary with a 1000-year period.
DoubleStar · CrB · Mag 5.6
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16 Dra
HIP 81290; 16 Dra
A tight close pair (3.1") with a wide third component at 90.2". Mags 5.4 + 6.4 + 5.5. The wide companion makes this a satisfying visual triple.
DoubleStar · Dra · Mag 5.4
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Alrakis
HIP 83608; Mu Dra; 21 Dra
Alrakis
A tight, equal pair at 2.6" separation. Mags 5.7 + 5.7. Identical white twins. Needs steady seeing and 200x+ to split cleanly.
DoubleStar · Dra · Mag 5.7
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Rasalgethi
HIP 84345; Alpha1 Her; 64 Her
Rasalgethi
Rasalgethi — a striking pair: orange-red supergiant primary with blue-green companion at 5.0". Mags 3.5 + 5.4. The primary is a semi-regular variable. Superb color contrast.
DoubleStar · Her · Mag 3.5
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Sarin
HIP 84379; Delta Her; 65 Her
Sarin
A wide pair at 13.7" with a large magnitude difference. Mags 3.1 + 8.3. The faint companion is a challenge in the primary's glare.
DoubleStar · Her · Mag 3.1
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Guniibuu
HIP 84405; 36 Oph
Guniibuu
A close, equal pair of orange dwarfs at 5.1" separation. Mags 5.1 + 5.1. One of the nearest star systems at 19.5 light-years.
DoubleStar · Oph · Mag 5.1
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39 Oph
HIP 84626; 39 Oph
A moderate pair at 10.8" separation. Mags 5.2 + 6.6. Both slightly yellowish. In the rich Ophiuchus star fields.
DoubleStar · Oph · Mag 5.2
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Rho Her
HIP 85112; Rho Her; 75 Her
Rho Her
A close pair at 4.1" separation. Mags 4.5 + 5.4. Both white. A 34-year binary; separation changes noticeably over decades.
DoubleStar · Her · Mag 4.5
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Nu Dra
HIP 85829; Nu Dra; 25 Dra
Nu Dra
A very wide, equal pair at 62.1" — easily split in any instrument. Mags 4.9 + 4.9. Identical white twins. Beautiful in binoculars.
DoubleStar · Dra · Mag 4.9
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Dziban
HIP 86614; Psi1 Dra; 31 Dra
Dziban
A wide pair at 29.6" separation. Mags 4.6 + 5.6. Both white. Easy and pleasant near the north celestial pole.
DoubleStar · Dra · Mag 4.6
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40 Dra
HIP 88127; 40 Dra
A wide pair at 18.7" separation. Mags 5.7 + 6.0. Nearly equal white stars near the north celestial pole. Circumpolar from most northern latitudes.
DoubleStar · Dra · Mag 5.7
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95 Her
HIP 88267; 95 Her
A close, near-equal pair at 6.4" separation. Mags 4.9 + 5.2. Often described as having a gold and silver color contrast. A fine summer double.
DoubleStar · Her · Mag 4.9
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70 Oph
HIP 88601; 70 Oph
A classic binary at 6.6" separation. Mags 4.2 + 6.2. Yellow-orange primary with a slightly redder companion. An 88-year orbit — separation changes observably.
DoubleStar · Oph · Mag 4.2
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Epsilon Lyr
HIP 91919; Epsilon1 Lyr; 4 Lyr
Epsilon Lyr
The famous Double-Double near Vega. Naked eye splits the wide 210" pair; 150x+ reveals each is itself a double (2.2" and 2.4"). Mags 5.6 + 6.1 and 5.3 + 5.4.
DoubleStar · Lyr · Mag 5.6
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Zeta Lyr
HIP 91971; Zeta1 Lyr; 6 Lyr
Zeta Lyr
A wide pair at 43.7" separation. Mags 4.3 + 5.6. Both white. Easy and pleasant near the Ring Nebula.
DoubleStar · Lyr · Mag 4.3
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Sheliak
HIP 92420; Beta Lyr; 10 Lyr
Sheliak
Sheliak — a wide pair at 45.7". Mags 3.6 + 6.7. The primary is the prototype Beta Lyrae eclipsing variable (3.3-4.4 in 12.94 days).
DoubleStar · Lyr · Mag 3.6
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Struve 2404
Struve 2404
A challenging close pair at 3.6" separation. Mags 6.9 + 7.8. Both faint — requires moderate aperture and steady seeing.
DoubleStar · Aql · Mag 6.9
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Otto Struve 525
Otto Struve 525
An Otto Struve catalog double — a wide pair at 45.4" separation. Mags 6.1 + 7.6. Easy split near the Ring Nebula.
DoubleStar · Lyr · Mag 6.1
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Alya
HIP 92946; Theta1 Ser; 63 Ser
Alya
Alya — a wide, near-equal pair at 22.4" separation. Mags 4.6 + 4.9. Both white. A satisfying easy double.
DoubleStar · Ser · Mag 4.6
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Albireo
HIP 95947; Beta1 Cyg; 6 Cyg
Albireo
Albireo — the finest color-contrast double in the sky. Gold primary with sapphire companion at 34.6". Mags 3.2 + 4.7. Splits at any magnification. A must-see.
DoubleStar · Cyg · Mag 3.2
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57 Aql
HIP 97966; 57 Aql
A wide pair at 36.3" separation. Mags 5.7 + 6.4. Both yellow-white. A pleasant autumn double.
DoubleStar · Aql · Mag 5.7
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31 Cyg
HIP 99675; 31 Cyg
A wide pair with a third component. Mags 3.9 + 4.8 at 337". The brighter orange star contrasts with a blue companion. Beautiful color.
DoubleStar · Cyg · Mag 3.9
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Alpha Cap
HIP 100027; Alpha1 Cap; 5 Cap
Alpha Cap
Algedi — an extremely wide naked-eye pair at 381". Mags 3.7 + 4.3. Both stars are themselves close doubles. The pair is optical (not gravitationally bound).
DoubleStar · Cap · Mag 3.7
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Dabih
HIP 100345; Beta Cap; 9 Cap
Dabih
Dabih — a wide pair at 205" easily seen in binoculars. Mags 3.2 + 6.1. The brighter component is orange-yellow.
DoubleStar · Cap · Mag 3.2
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Gamma Del
HIP 102532; Gamma2 Del; 12 Del
Gamma Del
A lovely pair at 9.0" separation. Mags 4.4 + 5.0. Often described as gold and green, though true colors are debated. One of the finest summer doubles.
DoubleStar · Del · Mag 4.4
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61 Cyg
HIP 104214; 61 Cyg
A famous binary at 31.8" separation. Mags 5.2 + 6.1. Both orange dwarfs. Bessel measured its parallax in 1838 — the first stellar distance ever determined.
DoubleStar · Cyg · Mag 5.2
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Alfirk
HIP 106032; Beta Cep; 8 Cep
Alfirk
A wide pair at 13.5" with a large magnitude difference. Mags 3.2 + 8.6. The primary is a prototype Beta Cephei pulsating variable.
DoubleStar · Cep · Mag 3.2
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Struve 2816
Struve 2816
A Struve triple in Cepheus. Mags 5.7 + 7.5 + 7.5 at 11.8" and 20.6". A fine multiple star at moderate magnification.
DoubleStar · Cep · Mag 5.7
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Enif
HIP 107315; Epsilon Peg; 8 Peg
Enif
Enif — the bright nose of Pegasus has a very wide companion at 143.9". Mags 2.5 + 8.7. The faint companion is a challenge in the primary's orange glow.
DoubleStar · Peg · Mag 2.5
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Kurhah
HIP 108917; Xi Cep; 17 Cep
Kurhah
A close pair at 8.1" separation. Mags 4.5 + 6.4. Blue-white primary with a fainter companion. A nice autumn double.
DoubleStar · Cep · Mag 4.5
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Zeta Aqr
HIP 110960; Zeta2 Aqr; 55 Aqr
Zeta Aqr
A very tight pair at 2.4" separation. Mags 4.3 + 4.5. Near-equal yellow-white twins. Needs high magnification and good seeing — a fine test object.
DoubleStar · Aqr · Mag 4.3
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Delta Cep
HIP 110991; Delta Cep; 27 Cep
Delta Cephei — the prototype Cepheid variable also has a wide companion at 41" separation. Mags 4.2 + 6.1. The companion appears blue. Observe both the double and the variable nature.
DoubleStar · Cep · Mag 4.2
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8 Lac
HIP 111546; 8 Lac
A wide pair at 22.3" separation. Mags 5.7 + 6.3. Both white stars. A pleasant autumn double in Lacerta.
DoubleStar · Lac · Mag 5.7
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94 Aqr
HIP 115126; 94 Aqr
A moderate pair at 12.1" separation. Mags 5.3 + 7.0. The primary is slightly yellowish. A good autumn target.
DoubleStar · Aqr · Mag 5.3
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Sigma Cas
HIP 118243; Sigma Cas; 8 Cas
A tight pair at 3.1" separation. Mags 5.0 + 7.2. Needs moderate magnification and steady seeing. A fine ending to the list, returning to Cassiopeia where we started.
DoubleStar · Cas · Mag 5.0
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