Orbital elements of selected visual
binaries
P = orbital
period, in years; T = date of periastron, year and decimals; a = semi-major axis of
orbit, arcseconds; e = eccentricity of orbit; i = inclination of
orbit to plane of sky, degrees; peri = argument of periastron
(usually indicated by a lower-case Greek omega), degrees; node =
PA of ascending node (usually indicated by a capital Greek
omega), degrees.
These elements can be entered in this
BASIC program to find the
separation and position angle of each pair for any required
date.
The ADS number (left column) is that given
in R. G. Aitken’s New General
Catalogue of Double Stars, which
extends to declination –30°.
|
ADS
number |
Star
|
RA
h m
|
dec
° ’
|
Magnitudes
|
P
(years) |
T
|
a
” |
e
|
i
° |
peri
(little
omega) ° |
node
(big
omega) ° |
|
|
17175
|
85 Peg
|
00 02.2
|
+27 05
|
5.8
|
8.9
|
26.280
|
2015.7
|
00.83
|
0.38
|
49.00
|
96.00
|
290.00
|
|
434
|
Lambda Cas
|
00 31.8
|
+54 31
|
5.3
|
5.6
|
536.47
|
2012.09
|
01.165
|
0.816
|
75.80
|
260.50
|
17.40
|
|
520
|
BU 395
|
00 37.3
|
–24 46
|
6.2
|
6.6
|
25.090
|
2024.0
|
00.667
|
0.235
|
77.60
|
317.00
|
291.80
|
|
671
|
Eta Cas
|
00 49.1
|
+57 49
|
3.5
|
7.4
|
480.000
|
2369.6
|
11.994
|
0.497
|
34.76
|
268.59
|
278.42
|
|
755
|
36 And
|
00 55.0
|
+23 38
|
6.1
|
6.5
|
167.710
|
1956.2
|
01.002
|
0.304
|
45.80
|
359.10
|
173.10
|
|
1538
|
STF 186
|
01 55.9
|
+01 51
|
6.8
|
6.8
|
165.720
|
2058.0
|
00.986
|
0.726
|
72.40
|
219.70
|
40.20
|
|
1598
|
48 Cas
|
02 02.0
|
+70 54
|
4.7
|
6.7
|
60.550
|
2026.35
|
00.628
|
0.386
|
19.40
|
244.00
|
188.40
|
|
1615
|
Alpha Psc
|
02 02.0
|
+02 46
|
4.1
|
5.2
|
933.000
|
2098.6
|
04.0
|
0.696
|
120.90
|
225.40
|
23.30
|
|
1631
|
10 Ari
|
02 03.7
|
+25 56
|
5.8
|
7.9
|
325.000
|
1931.6
|
01.39
|
0.59
|
51.00
|
165.00
|
20.50
|
|
2402
|
Alpha For
|
03 12.1
|
–28 59
|
4.0
|
7.2
|
269.000
|
1947
|
04.0
|
0.73
|
81.00
|
43.00
|
117.00
|
|
2616
|
7 Tau
|
03 34.4
|
+24 28
|
6.6
|
6.9
|
522.160
|
1911.62
|
00.625
|
0.679
|
157.20
|
238.10
|
13.00
|
|
2799
|
STT 65
|
03 50.3
|
+25 35
|
5.7
|
6.5
|
61.000
|
1998.39
|
00.411
|
0.635
|
84.30
|
340.50
|
27.30
|
|
4241
|
Sigma Ori
|
05 38.7
|
–02 36
|
3.7
|
6.3
|
155.300
|
1997
|
00.264
|
0.051
|
160.40
|
18.00
|
136.00
|
|
5423
|
Alpha CMa
|
06 45.1
|
–16 43
|
–1.4
|
8.5
|
50.090
|
2044.40
|
07.500
|
0.592
|
136.53
|
147.27
|
44.57
|
|
5400
|
12 Lyn AB
|
06 46.2
|
+59 27
|
5.4
|
6.0
|
907.60
|
2677.4
|
02.30
|
0.37
|
134.70
|
322.60
|
166.5.
|
|
5514
|
14 Lyn
|
06 53.1
|
+59 27
|
6.0
|
6.5
|
403.150
|
1959.58
|
00.695
|
0.53
|
64.60
|
167.50
|
48.20
|
|
6175
|
Alpha Gem
|
07 34.6
|
+31 53
|
1.9
|
3.0
|
444.950
|
1960.10
|
06.593
|
0.323
|
114.61
|
253.31
|
41.46
|
|
6420
|
9 Pup
|
07 51.8
|
–13 54
|
5.6
|
6.5
|
22.700
|
1985.92
|
00.602
|
0.741
|
80.40
|
73.10
|
102.90
|
|
6650
|
Zeta Cnc AB
|
08 12.2
|
+17 39
|
5.3
|
6.3
|
59.580
|
1989.09
|
00.859
|
0.319
|
173.940
|
330.20
|
157.60
|
|
6650
|
Zeta Cnc AB–C
|
08 12.2
|
+17 39
|
5.1
|
6.2
|
1115.000
|
1970
|
07.7
|
0.24
|
146.00
|
345.50
|
74.20
|
|
6914
|
BU 208
|
08 39.1
|
–22 40
|
5.4
|
6.8
|
123.000
|
1986.6
|
01.705
|
0.33
|
82.90
|
309.20
|
31.80
|
|
—
|
I 314
|
08 39.4
|
–36 36
|
6.4
|
7.9
|
66.500
|
1992.2
|
00.527
|
0.86
|
102.00
|
341.00
|
55.70
|
|
—
|
Delta Vel
|
08 44.7
|
–54 43
|
var.
|
5.1
|
142.000
|
2000.8
|
01.99
|
0.47
|
105.20
|
188.00
|
163.60
|
|
6993
|
Epsilon Hya
|
08 46.8
|
+06 25
|
3.5
|
6.7
|
990.000
|
1920
|
04.66
|
0.30
|
39.00
|
200.00
|
49.30
|
|
7307
|
STF 1338
|
09 21.0
|
+38 11
|
6.7
|
7.1
|
303.270
|
2023.25
|
01.336
|
0.254
|
29.90
|
191.90
|
137.30
|
|
7390
|
Omega Leo
|
09 28.5
|
+09 03
|
5.7
|
7.3
|
118.230
|
1959.40
|
00.880
|
0.557
|
66.05
|
302.65
|
325.69
|
|
—
|
Psi Vel
|
09 30.7
|
–40 28
|
3.9
|
5.1
|
33.950
| < | |||||