Need help with Finding absolute magnitude

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    Absolute Magnitude
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SUMMARY

The discussion focuses on calculating the absolute magnitude (Mv) of a star using the period (P) of 7 days with the equation Mv = - [2.76 (log10(P) - 1.0)] - 4.16. The user seeks assistance in evaluating this expression, indicating a lack of access to a suitable calculator. Forum participants clarify that the task involves evaluating an expression rather than solving an equation and suggest using online calculators or smartphone apps to perform the calculation.

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  • Familiarity with logarithmic functions, specifically log10
  • Basic algebra skills for evaluating expressions
  • Access to a scientific calculator or equivalent tool
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  • Research online tools for evaluating mathematical expressions
  • Study the concept of absolute magnitude in stellar astronomy
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Michael c17
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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.
 
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Michael c17 said:
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.
 
Michael c17 said:
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.
 
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@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.
 

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