61 CYGNI
MULTIPLE STAR
Right Ascension:
21h 06m 55s
Best Seen:
7/1 - 12/15
Declination:
38º 44' 45"
Combined
Magnitude:
4.79
Computer File:
cyg61
Constellation:
Cygnus
Apparent
Separation:
33"
Actual
Compared to
Distance
11.35 / 11.42 l.y.
--
Separation
411 billion miles
4420 Earth/Sun
Orbital Period
700 years?
--
Actual Brightness
--
0.08 / 0.04 (Sun)
Magnitude
5.2 / 6.05
--
Mass
--
--
Surface Gravity
--
--
Surface Composition (by mass)
74% hydrogen 24% helium 2% everything else
same (Sun)
Spectral Type
K5 V / K7 V
G2 V (Sun)
Density (gram/cubic cm)
--
--
WHAT TO LOOK FOR THROUGH THE TELESCOPE:
-
Recommended eyepiece: 24mm or 40 mm.
-
When people look through the telescope they should see two stars next to each other. In this case the two stars should be about the same brightness.
61 CYGNI INFORMATION:
-
Both of these stars are smaller and fainter than the sun.
-
This object was the first star to have its parallax measured. This was done in 1838 by German astronomer Friedrich Wilhelm Bessel.
-
Because the stars are so far apart, they take many years to orbit each other – perhaps as many as 700 years.
Item
Updated
Notes
Coordinates
08-19-2002
OK
Combined Magnitude:
08-19-2002
with Scott’s The Flamsteed Collection
Apparent Separation:
08-19-2002
61 Cyg A: 21h 06m 53.9s, 38d 44'
57.9"
61 Cyg B: 21h 06m 55.2s, 38d 44'
31.4"
solve with 1s = 15", and Pythagorean Theorem – ~ 33"
Distance:
08-19-2002
from Scott’s The Flamsteed Collection
Separation:
08-19-2002
0.07 ly
Orbital Period
11-22-2002
see other information
Actual Brightness:
08-19-2002
from Scott’s The Flamsteed Collection
Magnitude:
08-19-2002
from Scott’s The Flamsteed Collection
Mass
Surface Gravity
Surface Composition
01-06-2003
OK for all stars
Spectral Type:
Density
Other information
08-19-2002
Item 2: http://www.dibonsmith.com/cyg_con.htm