Question: What is the apparent magnitude of the spiral galaxy discovered by Frank Leavenworth?

full_context: Document 1: Obsession Telescopes: Obsession Telescopes is an American telescope manufacturer that specializes in Dobsonian telescopes. Founded in 1989 by David Kriege, the company is based in Lake Mills, Wisconsin. It sells large aperture telescopes throughout the world. An example of a telescope they have produced is a Dobsonian with a 12.5 inch mirror. They have also produced telescopes with computerized positioning. The company is noted as a pioneer in amateur astronomy and is an important and the most major producer of Dobsonian telescopes. Around 1987 the founder, Kriege, went to a star party and experienced a Dobsonian telescope, and then built Obsession 1 at this time astronomy was a hobby (this is before founding OT). The style of telescope was unique early on but over time became more popular. One style of Dobsonian the company developed is an ultra-compact style. The Dobsonians are a big deal to amateur astronomers because they offer a big aperture compared to the cost of the telescope and its mobility. This allows the telescopes to be taken to star parties, where amateur astronomers gather at night to use their scopes together. Telescopes from OT have also been used for astrophotography.
Document 2: Frederick C. Leonard: Frederick Charles Leonard (March 12, 1896 – June 23, 1960) was an American astronomer. As a faculty member at the University of California, Los Angeles, he conducted extensive research on double stars and meteorites, largely shaping the university's Department of Astronomy. He received his undergraduate degree from the University of Chicago in 1918 and his PhD in astronomy from the University of California, Berkeley in 1921. Leonard was an astronomer from his teenage years, founding the Society for Practical Astronomy in 1909. In 1933 he founded The Society for Research on Meteorites, which later became known as the Meteoritical Society. He was its first president and was the Editor of the Society's journal for the next 25 years. The Society instituted the Leonard Medal in 1962, its premier award for outstanding contributions to the science of meteoritics and closely allied fields.
Document 3: NGC 2: NGC 2 is a spiral galaxy in the constellation Pegasus, discovered by Lawrence Parsons, 4th Earl of Rosse on 20 August 1873, and was described as "very faint, small, south of NGC 1." It lies slightly to the south of NGC 1. It is a faint spiral galaxy of apparent magnitude 14.2.
Document 4: Francis Preserved Leavenworth: 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.
Document 5: NGC 166: 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.
Document 6: NGC 6285: NGC 6285 is an interacting spiral galaxy located in the constellation Draco. It is designated as S0-a in the galaxy morphological classification scheme and was discovered by the American astronomer Lewis A. Swift in 1886. NGC 6285 is located at about 262 million light years away from earth. NGC 6285 and NGC 6286 form a pair of interacting galaxies, with tidal distortions, categorized as Arp 293 in the Arp Atlas of Peculiar Galaxies<ref name="NASA/IPAC"> </ref>
Document 7: Frank W. Preston: Frank W. Preston (June 14, 1896 – March 1, 1989) was an English-American engineer, ecologist, and conservationist. He helped found the Western Pennsylvania Conservancy and worked to reclaim the land that is now Moraine State Park in Butler County, Pennsylvania, in the United States. Preston was a leading expert in glass technology. He studied birds throughout his life and published papers on the shapes and pigmentation of birds eggs, the distribution of the heights of their nests and their migration patterns. Preston also wrote three major papers on the mathematical characteristics of ecological rarity and commonness.
Document 8: NGC 3626: NGC 3626, also Caldwell 40, is a medium-tightness spiral galaxy and Caldwell object in the constellation Leo. It was discovered by William Herschel, on 14 March 1784. It shines at magnitude +10.6/+10.9. Its celestial coordinates are RA 11 20.1 , dec +18 ° 21′ . It is located near the naked-eye class A4 star Zosma, as well as galaxies NGC 3608, NGC 3607, NGC 3659, NGC 3686, NGC 3684, NGC 3691, NGC 3681, and NGC 3655. Its dimensions are 2′.7 × 1′.9. The galaxy belongs to the NGC 3607 group some 70 million light-years distant, itself one of the many Leo II groups.
Document 9: NSV 1436: NSV 1436, listed in the "New Catalogue of Suspected Variable Stars" (NSV), is a cataclysmic variable star in the constellation Perseus. It is believed to be similar to a dwarf nova like the star U Geminorum, but little is known. The last outburst observed was in late November 1948. A small outburst occurred on March 9–10, 2011 when it briefly reached about visual magnitude 14.5. A brighter outburst phase began and was observed on March 28, 2011 at visual magnitude 13.49 and confirmed at visual magnitude 12.8 on March 30, 2011. The object is typically fainter than visual magnitude 16. Observations were requested by the American Association of Variable Star Observers (AAVSO) during the 2011 outburst phase to help classify the object, and to see if it is an infrequently outbursting normal dwarf nova like WZ Sagittae or a recurrent nova. The object is a known X-ray source.
Document 10: Malin 1: Malin 1 is a giant low surface brightness (LSB) spiral galaxy, the prototype of LSB galaxies. It is located 366 Mpc away in the constellation Coma Berenices, near the North Galactic Pole. s of 2015 it is the largest known spiral galaxy so far discovered, with an approximate diameter of 650000 ly , six and a half times the diameter of our Milky Way. It was discovered by astronomer David Malin in 1986 and is the first LSB galaxy verified to exist. As such, it is also the first giant LSB galaxy discovered. Its high surface brightness central spiral is 30000 ly across, with a bulge of 10000 ly . The central spiral is a SB0a type barred-spiral.
Document 11: Donald B. Campbell: Donald B. Campbell is an Australian-born astronomer and Professor of Astronomy at Cornell University. Prior to joining the Cornell faculty he was Director of the Arecibo Observatory in Puerto Rico for seven years. Campbell's research work is in the general area of planetary studies with a concentration on the radio-wavelength-scattering properties of planets, planetary satellites, and small bodies. His work includes studies of Venus, the Moon, the Galilean satellites of Jupiter, Titan, as well as comets and asteroids. Campbell observed near-Earth asteroid 433 Eros, which was the first asteroid detected by the Arecibo Observatory radar system.
Document 12: Donald Machholz: Donald Edward Machholz, born October 7, 1952 in Portsmouth, Virginia, is an American amateur astronomer who is the most successful living visual comet discoverer in the world. Credited with the discovery of 11 comets, that include the periodic comets 96P/Machholz, 141P/Machholz, the non-periodic C/2004 Q2 (Machholz) that were visible with binoculars in the northern sky in 2004 and 2005, and most recently, C/2010 F4 (Machholz). In 1985, comet Machholz 1985-e, was discovered using a homemade cardboard telescope with a wide aperture, 10 inches across, that gave it a broader field of view than most commercial telescopes. Amateur astronomer Machholz utilizes a variety of methods in his comet discoveries, in 1986 using 29×130 binoculars he discovered 96P/Machholz.
Document 13: NGC 6286: NGC 6286 is an interacting spiral galaxy located in the constellation Draco. It is designated as Sb/P in the galaxy morphological classification scheme and was discovered by the American astronomer Lewis A. Swift on 13 August 1885. NGC 6286 is located at about 252 million light years away from Earth. NGC 6286 and NGC 6285 form a pair of interacting galaxies, with tidal distortions, categorized as Arp 293 in the Arp Atlas of Peculiar Galaxies.<ref name="NASA/IPAC"> </ref>
Document 14: Fort Leavenworth National Cemetery: Fort Leavenworth National Cemetery is a United States National Cemetery located on Fort Leavenworth, a United States Army installation north of Leavenworth, Kansas. It was officially established in 1862, but was used as a burial ground as early as 1844. The cemetery is the resting place of eight Medal of Honor recipients, but most are the unknown soldiers of war. It was named for Brigadier General Henry Leavenworth, who was re-interred there in 1902 from Woodland Cemetery in Delhi, New York. Administered by the United States Department of Veterans Affairs, it occupies approximately 36.1 acre and was site to 22,679 interments, as of the end of 2005. It is maintained by Leavenworth National Cemetery.
Document 15: NGC 908: NGC 908 is an unbarred spiral galaxy in the constellation Cetus. It is at a distance of 60 million light years away from Earth. NGC 908 has vigorous star formation and is a starburst galaxy. The galaxy has three-arm spiral pattern, with two arms with peculiar morphology. The central bulge of the galaxy is bright. Cluster of young stars and star forming knots can be seen in the arms. Starburst activity and the peculiar morphology of the galaxy indicated it has a close encounter with another galaxy, although none is visible now. NGC 908 was discovered in 1786 by William Herschel. Two supernovae have been observed in NGC 908, SN 1994ai (Ic type, mag. 17) and SN 2006ce (Ia type, mag. 12.4). It is the main galaxy in the NGC 908 group, which also includes NGC 899, NGC 907 and IC 223.
ground_truth: 15.18