Cygnus OB2-12 is a star that has an apparent magnitude m = +11.4 and an absolute magnitude MV = −10.6. How far away is Cygnus OB2-12 from Earth?
A. Much farther away than 10 parsecs.
B. A little farther away than 10 parsecs.
C. Exactly 10 parsecs away.
D. Closer than 10 parsecs away.
Answer:A
Cygnus OB2-12 is a star that has an apparent magnitude m = +11.4 and an absolute magnitude MV = −10.6. How far away is Cygnus OB2-12 from Earth?
A. Much farther away than 10 parsecs. B. A little farther away than 10 parsecs. C. Exactly 10 parsecs away. D. Closer than 10 parsecs away.