GAMMA (γ) DELPHINI
OPTICAL DOUBLE STAR
Right Ascension:
20h 46m 38.9s
Best Seen:
8/1 - 12/15
Declination:
16º 07' 27"
Combined
Magnitude:
4.01
Computer File:
gammadel
Constellation:
Delphinus
Apparent
Separation:
42"
Actual
Compared to Sun
Distance
103 / 101 l.y.
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Actual Brightness
--
6.2 / 13
Magnitude
5.25 / 4.44
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Mass
--
--
Surface Gravity
--
--
Surface Composition (by mass)
74% hydrogen 24% helium 2% everything else
same
Spectral Type
K1 IV / A2 Ia
G2 V
Density (gram/cubic cm)
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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. One of the stars should be slightly brighter than the other.
GAMMA DELPHINI INFORMATION:
- This star is in the northeast corner of the constellation.
Item
Updated
Notes
Coordinates
12-06-2002
from Scott’s The Flamsteed Collection and close match to SIMBAD
Combined Magnitude
12-06-2002
from Flamsteed
Apparent Separation
12-06-2002
from coordinates
Distance
12-06-2002
from Flamsteed
Actual Brightness
12-06-2002
from Flamsteed
Magnitude
12-06-2002
from Flamsteed
Mass
Surface Gravity
Surface Composition
01-06-2003
OK for all stars
Spectral Type
12-09-2002
SIMBAD and Flamsteed: gam01 at K1 IV OK.... for gam02, Hipparcos says A2Ia+... while SIMBAD says F7V: going with A2Ia – more recent, and A2 star would dominate any measurement of a F7V star
Density
Other Information
can’t find any info