139 close double stars known to be in orbit around each other were culled from
SkyTools
databases with the following requirements:
- Both binary components must be brighter than magnitude 13.0.
- The binary at some point must rise above 2 air masses at latitude 39°N.
- The binary separation must be less than roughly 4-6 arc seconds but
greater than 0.9 arc seconds.
That is, for the most part there must be a reasonable chance that I will be able
to detect most of these doubles using my 150mm refractor on a good night in
Washington, DC, but neither should the doubles be extremely easy. A few doubles
which do not meet these requirements (e.g., Sirius, which a 120mm telescope will
never split) were included simply because they are well known.
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designation comp. mags sep(") chart RA DEC
------------------- ----------- ------ ----- ----- ------
HD 224873 8.61, 9.84 1.20 4 00 01 +39 37
HD 123 5.98, 7.43 1.53 1 00 06 +58 26
HD 1624 7.91, 9 1.59 1 00 21 +67 40
V547 Cas 10.27, 12.8 4.03 1 00 33 +67 14
HD 3972 7.59, 9.73 1.59 10 00 42 +04 10
HD 4777 7.83, 8.82 0.93 4 00 50 +50 38
HD 5041 9.43, 10.62 0.93 10 00 52 -13 13
36 And, HD 5286 5.46, 6.59 0.97 4 00 55 +23 38
HD 6114 6.46, 8.14 1.05 4 01 03 +47 23
HD 9575 8.51, 9.38 0.90 10 01 34 -12 12
UV Cet 12.5, 13 1.51 10 01 39 -17 57
HD 10543 6.18, 8.61 1.07 1 01 44 +57 32
HD 11803 6.01, 6.94 0.95 10 01 56 +01 52
Alpha Psc, 113 Psc 3.82, 5.27 1.82 10 02 02 +02 46
HD 12376 (AC) 8.22, 11.19 1.14 4 02 02 +36 43
10 Ari, HD 12558 5.64, 7.95 1.28 4 02 04 +25 56
HD 13594 6.05, 7.27 1.00 4 02 14 +47 29
HD 14001 7.94, 9.28 1.67 10 02 16 -18 14
Iota Cas (AC) 4.46, 8.5 2.52 1 02 29 +67 24
HD 16638 7.55, 9.18 0.96 4 02 41 +26 38
HD 17332 6.9, 8.28 3.71 4 02 48 +19 23
HD 19771 7.29, 8.31 2.61 4 03 12 +37 13
HD 20115 7.36, 8.26 1.11 10 03 14 +00 45
95 Cet, HD 20559 5.62, 8.02 1.41 10 03 18 -00 56
HD 21903 6.43, 8.03 1.61 1 03 35 +60 03
HD 25444 7.13, 9.33 1.26 5 04 04 +39 31
HD 25893 (AB) 7.13, 9.76 1.79 5 04 08 +38 05
HD 25893 (AC) 7.13, 8 233.10 5 04 08 +38 05 PA=210
HD 25893 (CD) 8, 11.5 1.00 5 04 08 +38 05
HD 27691 6.97, 8.77 1.39 11 04 23 +15 03
HD 27762 6.64, 8.37 0.99 11 04 23 +11 23
80 Tau, HD 28485 5.58, 8.27 1.71 11 04 30 +15 38
HD 29695 7.6, 8.52 1.08 5 04 42 +37 31
HD 32022 8.02, 9.3 1.02 11 05 01 +05 06
HD 32915 7.87, 9.8 1.30 11 05 06 -13 55
HD 35112 7.76, 10.77 1.13 11 05 23 +02 36
HD 34839 7.32, 8.59 1.22 1 05 25 +63 23
32 Ori, HD 36267 4.2, 5.8 1.06 11 05 31 +05 57
HD 37013 6.88, 7.97 4.09 5 05 36 +22 00
Zeta Ori, 50 Ori 1.74, 3.95 2.27 11 05 41 -01 57
Eta Gem, 7 Gem 3.31, 6.07 1.59 5 06 15 +22 30
HIP 31345 7.64, 8.63 1.68 12 06 34 +14 45
Sirius, Alpha CMa -1.44, 8.5 5.18 12 06 45 -16 43
12 Lynx 4.86, 6.07 1.70 1 06 46 +59 27
HD 49409 7.92, 9.65 1.16 12 06 49 +07 37
38 Gem, HD 50635 4.73, 7.8 5.23 12 06 55 +13 11
HD 55130 6.46, 7.36 1.19 5 07 13 +27 13
Delta Gem 3.5, 8.5 5.74 5 07 20 +21 59
Castor 1.58, 2.97 4.10 5 07 35 +31 53
HD 59438 6.05, 7.72 2.03 12 07 29 -15 00
Castor, Alpha Gem 1.58, 2.97 4.11 5 07 35 +31 53
Procyon, Alpha CMi 0.4 13 4.39 12 07 39 +05 13
HD 66177 7.61, 9.33 1.17 12 08 02 +04 09
Zeta 1 Cnc, 16 Cnc 4.67, 6.09 0.88 12 08 12 +17 39
Epsilon Hya (AC) 3.38, 6.67 2.69 12 08 47 +06 25
HIP 43422 9.08, 10.4 2.47 12 08 51 +07 52
Iota UMa, 9 UMa 3.12, 9.5 2.14 6 08 59 +48 03
Sigma 2 UMa, 13 UMa 4.8, 8.85 3.96 2 09 10 +67 08
HD 79210 7.64, 7.97 17.18 2 09 14 +52 41
HD 80441 6.12, 7.12 1.04 6 09 21 +38 11
SAO 7063 9.48, 10.37 1.67 2 10 11 +75 08
SAO 7063 9.48, 10.37 1.67 2 10 11 +75 08
HD 88533 8.3, 10.33 1.00 6 10 13 +27 25
HD 88987 6.6, 7.56 1.50 13 10 16 +17 44
HD 89376 8.86, 10.27 0.95 6 10 19 +20 34
Gamma 1 Leo, 41 Leo 2.01, 3.64 4.42 6 10 20 +19 50
HD 89906 7.26, 10.28 1.90 13 10 23 +15 20
55 Leo 5.91, 9.14 1.12 13 10 56 +00 44
HD 95690 8.45, 9.75 1.19 2 11 04 +54 31
HD 98231 4.4, 4.9 1.80 6 11 18 +31 32
Iota Leo, 78 Leo 4, 6.92 1.75 13 11 24 +10 32
HD 102590 5.9, 8.69 1.13 13 11 49 +14 17
SAO 119296 9.45, 10.62 1.25 13 12 16 +05 38
HD 108007 6.41, 7.94 1.68 7 12 25 +25 35
HIP 60759 8.24, 9.38 1.81 7 12 27 +27 01
HD 108799 6.37, 9.59 2.17 14 12 30 -13 24
Gamma Vir, 29 Vir 2.74, 3.6 1.63 14 12 42 -01 27
35 Com 4.89, 7.18 1.16 7 12 53 +21 14
78 UMa 4.93, 8.16 1.47 2 13 01 +56 22
HIP 65343 8.88, 9.95 1.32 7 13 33 +29 14
HD 118036 7.37, 8.81 1.59 14 13 34 -00 19
25 CVn 4.82, 7.07 1.84 7 13 38 +36 17
HD 120476 7.05, 8.15 3.27 7 13 49 +26 59
HD 121325 6.19, 7.5 3.51 14 13 55 -08 04
HD 121995 8.27, 9.24 1.53 7 13 58 +51 59
HIP 69422 8.33, 9.42 2.27 2 14 13 +55 19
HD 125796 7.4, 8.36 1.42 7 14 20 +48 30
HD 130145 7.26, 8.52 1.53 14 14 46 +09 39
37 Boo, Xi Boo 4.54, 7.08 6.56 7 14 51 +19 06
HD 131315 7.7, 8.69 1.03 7 14 52 +44 56
44 Boo 4.83, 6.09 2.26 7 15 04 +47 39
HD 136176 6.59, 7.48 1.61 7 15 18 +26 50
Mu 1 Boo, 51 Boo (AB) 4.31, 7.2 108.30 7 15 25 +37 22
Mu 1 Boo, 51 Boo (BC) 7.2, 7.74 2.26 7 15 25 +37 22
13 Ser, Delta Ser 3.8, 5.26 4.30 15 15 35 +10 32
HD 142661 6.77, 8.8 6.22 15 15 56 -02 10
Sigma CrB, 17 CrB (AC) 5.23, 13.3 8.70 8 16 15 +33 51
Sigma CrB, 17 CrB (AB) 5.23, 6.74 7.13 8 16 15 +33 51
HD 146413 8.7, 9.79 3.27 15 16 16 +07 21
HD 148653 6.98, 7.97 1.99 15 16 29 +18 25
Lambda Oph, 10 Oph 3.82, 5.22 1.54 15 16 31 +01 59
HD 152380 6.62, 8.53 1.44 8 16 52 +28 40
20 Dra, HD 153697 6.4, 7.37 1.27 3 16 56 +65 02
Mu Dra, 21 Dra, Arrakis 4.91, 5.81 2.23 3 17 05 +54 28
HD 154621 8.31, 10.02 1.04 15 17 07 +00 39
Alpha 1 Her, 64 Her 2.78, 5.37 4.65 15 17 15 +14 23
26 Dra, HD 160269 5.23, 8.76 1.64 3 17 35 +61 52
HD 160910 5.54, 9.8 1.15 15 17 42 +15 57
Tau Oph, 69 Oph 4.77, 6 1.65 15 18 03 -08 11
HD 165170 7.1, 9.22 1.14 8 18 03 +44 14
70 Oph, HD 165341 4.03, 6.17 4.13 15 18 06 +02 30
HD 166479 6.09, 7.2 1.24 15 18 10 +16 29
HD 167278 7.6, 8.62 1.18 15 18 15 +00 11
HIP 91159 6.21, 7.13 1.30 16 18 36 +16 59
Struve 2398, HD 173739 8.94, 10 12.65 3 18 43 +59 38
Epsilon 1 Lyr (AB) 4.67, 6.19 2.56 8 18 44 +39 40
Epsilon 1 Lyr (CD) 5.1, 5.51 2.32 8 18 44 +39 40
HD 176560 6.47, 7.43 0.94 3 18 58 +58 13
HD 178091 8.02, 9.88 1.29 8 19 06 +30 26
HD 180054 7.66, 9.66 1.65 8 19 14 +19 04
HD 183032 7.46, 8.48 2.03 8 19 27 +27 19
HD 231683 8.27, 11.38 1.88 16 19 32 +17 47
Delta Cyg, 18 Cyg 2.86, 6.64 2.51 8 19 45 +45 08
HD 186858 7.68, 8.63 2.67 8 19 46 +33 36
HD 189783 6.97, 8.11 4.19 16 20 02 +10 45
PPM 169851, HIP 100355 10.18, 11.1 1.03 16 20 21 +02 49
HD 197913 7.09, 8.47 6.08 16 20 46 +15 55
HD 200375 6.24, 7.4 1.45 16 21 03 +01 32
HD 203802 8.1, 10.82 0.94 3 21 22 +57 34
HIP 107310 4.49, 6.31 1.15 9 21 44 +28 45
HD 239960, Krueger 60 9.59, 11.41 2.91 3 22 28 +57 42
Zeta 1 Aqr, 55 Aqr 3.65, 4.6 2.14 17 22 29 -00 01
HD 215013 (AC) 8.21, 9.5 1.17 9 22 42 +21 26
HD 216608 5.79, 7.83 0.91 9 22 54 +44 45
Pi Cep, 33 Cep 4.41, 6.93 1.08 3 23 08 +75 23
HD 219657 7.88, 9.64 1.51 17 23 18 -01 31
Omicron Cep, 34 Cep 4.75, 7.28 2.78 3 23 19 +68 07
EQ Peg 10.05, 12.4 4.09 9 23 32 +19 56
HD 224635 5.81, 6.79 1.69 9 00 00 +33 44
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NOTES: (1) Separations are in arc seconds.
(2) "Chart" is the Sky Atlas 2000 chart number.
(3) Coordinates and separations are apparent for June, 2001.
