It's a pair of F5 stars a little larger and hotter than the Sun, about 63 light-years away and shining in our sky at a combined magnitude
Because of this the combined magnitude
would have been approximately 5.
The Whirlpool and its mate shine at a combined magnitude
If more than one quake occurred simultaneously, the combined magnitude
could be 8, the governmental committee said.
Only a combined magnitude
is available for VV 102; the components are too tightly bound to measure separately.
I used differential aperture photometry in AIP4WIN to measure the combined magnitude
of Ganymede and Europa assuming a magnitude of 5.
That impression is not as strong in images, but M37 still looks darned good: a mob of small stars in a roughly spherical shape with a moderately bright combined magnitude
At a size of 14' across, M37 is well framed in almost any telescope, and the bright combined magnitude
of its stars, 5.
The 10'-diameter NGC 6939 shines with a combined magnitude
Their combined magnitude
is almost exactly -5, which is equal to 100 zero-magnitude stars like Vega.
This would make the combined magnitude
for the unresolved pair of compact, high-surface-brightness galaxies magnitude 14.
An asterisked value is the combined magnitude
of a close pair resolved by Hipparcos.