| 词条 | NGC 257 |
| 释义 |
| name = NGC 257 | image = | epoch = J2000 | constellation name = Pisces | ra = {{RA|00|48|01.510}}[1] | dec = {{DEC|+08|17|49.45}}[1] | z = 0.017592[2] | h_radial_v = 5274 km/s[2] | dist_ly = {{cvt|67.343|±|10.649|Mpc|Mly|lk=on|order=flip}}[2] | group_cluster = | type = Scd?[2] | size = {{cvt|43100|pc|ly|lk=on|order=flip}}[2][3] | appmag_v = | appmag_b = 13.7[4] | absmag_v = | size_v = 3.0′ × 2.5′[2] | notes = | names = UGC 493, MGC+01-03-003, PGC 2818 }}NGC 257 is a spiral galaxy in the Pisces constellation. It was discovered on December 29, 1790, by Frederick William Herschel.[5] References1. ^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+257&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 0257|publisher=National Aeronautics and Space Administration / Infrared Processing and Analysis Center|accessdate=25 June 2017}} 3. ^POSS1 103a-O values used. 4. ^{{cite simbad|title=NGC 257|access-date=25 June 2017}} 5. ^{{cite web|url=http://cseligman.com/text/atlas/ngc2a.htm#257|title=New General Catalogue objects: NGC 250 - 299|author=Seligman, Courtney|website=cseligman.com|accessdate=25 June 2017}} Notes{{reflist|group=note}}{{Catalogs | NGC = 257}}{{galaxy-stub}} 6 : Astronomical objects discovered in 1790|Pisces (constellation)|Spiral galaxies|Principal Galaxies Catalogue objects|UGC objects|NGC objects |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。