Question: What is the apparent magnitude of the spiral galaxy discovered by Frank Leavenworth?
Related documents: [0]  [DOC] Francis Preserved Leavenworth (born September 3, 1858 in Mount Vernon, Indiana; died November 12, 1928; a.k.a. "Frank Leavenworth") was an American astronomer. He discovered many New General Catalogue objects together with Frank Muller and Ormond Stone. They used a telescope with a 66-cm aperture at the Leander McCormick Observatory at the University of Virginia in Charlottesville, Virginia. [END] 
[1]  [DOC] NGC 166 (also known as PGC 2143) is a spiral galaxy located around 2.6 million light-years away in the constellation Cetus, with an apparent magnitude of 15.18. It was discovered by Francis Preserved Leavenworth in 1886. [END] 
Answer: 
15.18
15.18