Some Visual Magnitudes

Object Visual
magnitude
Sun −26.5
Full Moon −12.5
Venus (at brightest) −4.74
Jupiter (at brightest) −2.1
Sirius (the brightest star) −1.4
Vega 0.1
Deneb 1.3
Aldebaran 1.0
Altair 1.0
Halley's Comet
(at its brightest in 1986)
2.0
Naked eye limit
(urban areas)
2.5
Andromeda galaxy 5.0
Orion nebula 6.0
Naked eye limit
(dark sky)
6.2
(About 6000 stars have magnitudes
greater than 6.2.)
Naked eye
(experienced,
gifted observers
under ideal conditions)
7.0
Naked eye
(laboratory tests with artificial stars)
8.5
8-inch telescope limit 14.0
Limit of largest
earth-based telescopes
25
X

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