What is the sun's apparent magnitude when seen from pluto?

Question

What is the sun's apparent magnitude when seen from pluto?

Answer 1

Saw it stated once as -19

Answer 2

The sun is 39.5 times further away from pluto than us, so the light intensity is 1/39.5^2 or about one half of 1 thousanth weaker.

Instead of one kW per square meter, you'd feel only 1/2watt per square meter. That's as much light as a typical 100W light bulb about 12 ft away, which is as bright as a typical living room with a lamp on.

So when you are on pluto, the sun is as bright as a light bulb 12 ft away but it's size is a bright point the size of a basketball one mile away.

Answer 3

well as we all know that dogs have no conception of size,ie jack russel v rotweiller....so obviously they dont give a d**n about the sun alll they know is it makes them pant a lot and very thirsty...what a dumb question just ask goofy!

Answer 4

Earth's nearly circular orbit around the sun is 149,597,890 km radius. This is defined as one astronomical unit or AU. Pluto orbit is highly elliptical with an aphelion of 49.3AU, a perihelion of 29.6AU, but on average it is 39.5AU. Right now, it is 30.4AU.

The apparent magnitude of the sun (as viewed from earth) is -26.7.  Sunlight at 39.5 times farther distance will appear 1560 times dimmer (inverse square rule).  The apparent magnitude is -2.512log(F), where F is the flux of the sunlight.  Log(1560, base 2.512) about 8; therefore the apparent magnitude of the sun as viewed from Pluto approximately -19.  (-26.7--8 = 18.7)

Answer 5

I would guess about -5

-19 is the Sun's apparent magnitude from earth, that's way too bright.  

-3.7 is what Venus looks like to us at night, so -5 seems about right to me.

Answer 6

The Sun's magnitude from Earth is -26.7.  The Sun's magnitude from from Pluto is -18.7.  The Sun's magnitude from Alpha Centauri is 0.5, which is Alpha Centauri's magnitude from Earth.