How bright would Pistol star or Eta Carinae be

>>7977324
Like, pretty bright, like, dude.

https://en.wikipedia.org/wiki/Absolute_magnitude

shut the fug up

>>7977419
>>7977426
Interesting question. Bump. But I'm not sure if the /universitycirclejerk/ board is the right place to discuss this.

If an -8.5M star were 4.4ly away from us it would have an apparent magnitude of -12.75m

The Sun has an apparent magnitude of -27 so, the star would appear ~500,000 times fainter than the star. In short it wouldn't be spectacular

>>7977527
> the star would appear ~500,000 times fainter than the star.

correction: the star would appear 500,000 times fainter than the Sun

relevant equations: 2.5^(m1-m1), m-M=5log(D/10pc)

If we woke up one day and found a hypergiant star was 4ly from us, we would not have any time to admire how bright it is because we would need to concentrate on getting the fuck out of this general vicinity before it goes supernova and cooks our ass in a million years or less.

>>7977527
Couldn't you just say that it'd have same magnitude ad the full Moon (mean distance value -12.74)?
Does apparent magnitude effect the apparent radius from Earth?
Also would it light up the Earth like a full moon?

>>7977538
I don't think that is how magnitude works. It would be just as bright as the moon but I don't believe it would light up the Earth the same as the Moon does seeing how the moon's angular diameter is much larger than that of a cen

File: 2A160C5200000578-3143237-image-a-54_1435586145062.jpg (41KB, 634x423px) Image search: [Google]

41KB, 634x423px

So basically it would be a dot in the sky a little brighter than Venus.

>>7977772
19.74 times brighter than Venus. But yeah, just barely visible in daylight

>>7977806
Or 1393 times brighter? whatever dumb logarithms