# Need help with Finding absolute magnitude

• Michael c17

#### Michael c17

Homework Statement
Need to solve this equation
Relevant Equations
Mv = - [2.76 (log10(P) - 1.0)] - 4.16
P is = to 7 and I don't know how to get the absolute magnitude please help.

Homework Statement:: Need to solve this equation
Relevant Equations:: Mv = - [2.76 (log10(P) - 1.0)] - 4.16

P is = to 7 and I don't know how to get the absolute magnitude please help.
Please post the whole question as given to you. Define any variables that would only be obvious to someone versed in astronomy.
The "relevant equations " section is for standard equations, not any that only relate to the given problem. Maybe that is a standard equation.. I don't know.

And, per forum rules, please show some attempt, or at least provide your thinking so far.

I don't understand what your saying, there is the equation and 7 is P I just need someone to plug it in and give me Mv since I don't have a calculator that can do that. Sorry I'm not versed in your forum rules. I'm just trying to find the absolute magnitude of a star using only the period in days which is 7.

I just need someone to plug it in and give me Mv
That's a key piece of information right there, that Mv (##M_v##?) is one variable, not two.
You confused me by saying you needed to solve the equation. What you are asking for is merely to evaluate an expression.

I find it hard to believe there exists any calculator that cannot do this. Just google online calculator and you will find several.
If you mean that you cannot do the whole expression in one hit, just do it in stages.

Steve4Physics
@Michael c17, have you a smart-phone? My (low-end) phone has a calculator which includes 'advanced options' with log₁₀, brackets, trig' functions, etc. Check yours if you have one.