Are the moons of jupiter visible through a pair of 10×50 binoculars?
Thursday, March 26th, 2009 at
12:37 am
Fantail Flycatcher asked:
I have been seeing 1 dot adjacent to jupiter with my 10x50 binoculars. Is it mere psychological effect or I have really seen a satellite. I believe I checked on K stars it shows Io has magnitude around 5 and Ganymede around 4...something.
One day I see the dot, the next day its gone. Then again after a few days I see the dot. May be it does not show up when the moon is bright.
Thanks for your time.
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1) False
Total luminosity proportional to R^2 * T^4. As the temperature of the F-class star is at least twice higher than the K-class star, the radius must be much smaller.
2) False
Luminosity goes as M^3
3) True
Spectral type and colour are a direct indication of the surface temperature as stars are black bodies.
4) False
We can measure parallax out to 100 light years or so, the galaxy is much bigger than that.
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