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61 Cygni
Multiple Star System
| Right Ascension | 21h 06m 55s | Best Seen | 7/1 - 12/15 |
| Declination | 38° 44' 45" | Combined Magnitude | 4.79 |
| Apparent Separation | 33" | Constellation | Cygnus |
Actual |
Compared to Sun |
|
| Distance | 11.35 / 11.42 ly | -- |
| Separation | 411 billion miles | 4420 au |
| Orbital Period | 700 years ? | -- |
| Actual Brightness | -- | 0.08 / 0.04 |
| Magnitude | 5.2 / 6.05 | |
| Mass | -- | -- |
| Surface Gravity | -- | -- |
| Surface Composition (by mass) | 74% hydrogen 24% helium 2% everything else |
same |
| Spectral Type | K5 V / K7 V | G2 V |
| Density (gram/cubic cm) | -- | -- |
What To Look For Through The Telescope
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Recommended eyepiece: 24mm or 40 mm.
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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:
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Both of these stars are smaller and fainter than the sun.
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This object was the first star to have its parallax measured. This was done in 1838 by German astronomer Friedrich Wilhelm Bessel.
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Because the stars are so far apart, they take many years to orbit each other – perhaps as many as 700 years.
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References
| Item | Updated | Notes |
| -- | -- | -- |
| Coordinates | 2002-08-19 | OK |
| Combined Magnitude | 2002-08-19 | with Scott’s The Flamsteed Collection |
| Apparent Separation | 2002-08-19 | 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 | 2002-08-19 | from Scott’s The Flamsteed Collection |
| Separation | 2002-08-19 | 0.07 ly |
| Orbital Period | 2002-11-22 | see other information |
| Actual Brightness | 2002-08-19 | from Scott’s The Flamsteed Collection |
| Magnitude | 2002-08-19 | from Scott’s The Flamsteed Collection |
| Mass | -- | |
| Surface Gravity | -- | |
| Surface Composition | 2003-01-06- | OK for all stars |
| Spectral Type | -- | |
| Density | -- | |
| Other information | 2002-08-19 | Item 2: http://www.dibonsmith.com/cyg_con.htm |