| 词条 | NGC 121 |
| 释义 |
| name = NGC 121 | image = | caption = Hubble Space Telescope image of globular cluster NGC 121 | credit = | epoch = J2000 | class = | constellation = Tucana | ra = {{RA|00|26|48.25}} [1] | dec = {{DEC|-71|32|8.4}} [1] | dist_ly = 199.0 Kly | dist_pc = 61 Kpc [1] | appmag_v = 11.24 [2] | size_v = | mass_msol = | mass_kg = | radius_arcminsec = | radius_ly = 175 light years [3] | radius_pc = 53.7 parsecs | radius_tidal_arcminsec = | radius_tidal_ly = | radius_tidal_pc = | v_hb = | metal_fe = | age = 10 billion years [3] | notes = | names = }}NGC 121 is a globular cluster in the Small Magellanic Cloud, in the constellation of Tucana. It was first discovered by John Herschel on September 20, 1835. The compiler of the New General Catalogue, John Louis Emil Dreyer, described this object as "pretty bright, pretty small, little extended, very gradually brighter middle".[3] References1. ^1 2 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 121 | url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+121&img_stamp=yes&extend=no | accessdate=2015-09-29 }} {{Ngc5}}2. ^{{cite simbad | title=NGC 121 | accessdate=2015-09-29 }} 3. ^1 2 {{cite web | title=New General Catalogue Objects: NGC 100-149 | url=http://cseligman.com/text/atlas/ngc1.htm | accessdate=2015-09-29 }} 4 : Globular clusters|NGC objects|Small Magellanic Cloud|Astronomical objects discovered in 1835 |
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