| 词条 | NGC 251 |
| 释义 |
| name = NGC 251 | image = | caption = | epoch = J2000 | constellation name = Pisces | ra = {{RA|00|47|54.031}}[1] | dec = {{DEC|+19|35|48.51}}[1] | z = 0.015184[2] | h_radial_v = 4552 km/s[2] | dist_ly = {{cvt|62.657|+/-|3.876|Mpc|Mly|lk=on|order=flip}}[2] | group_cluster = | type = Sc[2] | size = {{cvt|45570|pc|ly|lk=on|order=flip}}[2][3] | appmag_v = | appmag_b = 14.6[4] | size_v = 2.4′ × 1.9′[2] | notes = | names = UGC 490, MGC+03-03-003, PGC 2806[4] }} NGC 251 is a spiral galaxy in the constellation of Pisces. It was discovered on October 15, 1784, by Frederick William Herschel. Notes1. ^1 {{cite journal|title=The Two Micron All Sky Survey (2MASS)|author=Skrutskie, M.|journal=The Astronomical Journal|volume=131|issue=2|pages=1163–1183|year=2006|doi=10.1086/498708|bibcode=2006AJ....131.1163S}} 2. ^1 2 3 4 5 {{cite web|url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+251&extend=no&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES|title=NED results for object NGC 0251|publisher=National Aeronautics and Space Administration / Infrared Processing and Analysis Center|accessdate=5 May 2017}} 3. ^POSS1 103a-O values used. 4. ^1 {{cite simbad|title=NGC 251|access-date=5 May 2017}} References{{reflist}}{{Ngc5}}{{Catalogs | NGC = 251 | PGC = 2806}}{{galaxy-stub}} 7 : Astronomical objects discovered in 1784|Pisces (constellation)|Spiral galaxies|Principal Galaxies Catalogue objects|UGC objects|NGC objects|Discoveries by William Herschel |
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