| 词条 | NGC 222 |
| 释义 |
| name = NGC 222 | image = | caption=NGC 222 | epoch = J2000 | ra = {{RA|00|40|43.7}}[1] | dec = {{DEC|-73|23|08}}[1] | constellation name = Tucana | dist_ly = 210000[2] | appmag_v = 12.64[3] | size_v = 1.2' x 1.2'[3] | mass_msol = | age = | notes = | names = ESO 029-SC 004.[1] }}NGC 222 is an open cluster located approximately 210,000 light-years from the Sun[2] in the Small Magellanic Cloud. It is located in the constellation Tucana. It was discovered on August 1, 1826 by James Dunlop.[4] See also
External links
References1. ^1 2 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 0222 | url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+222&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&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 | accessdate=2016-09-02}} {{Ngc5}}{{Stars of Tucana}}{{Sky|00|40|43.7||-73|23|08|190000000}}2. ^1 An object's distance from Earth can be determinded using Hubble's law: v=Ho is Hubble's constant (70±5 (km/s)/Mpc). The relative uncertainty Δd/d divided by the distance is equal to the sum of the relative uncertainties of the velocity and v=Ho 3. ^1 {{cite simbad|title=NGC 222|accessdate=31 December 2016}} 4. ^{{cite web|title=New General Catalog Objects: NGC 200 - 249|url=http://cseligman.com/text/atlas/ngc2.htm#222|publisher=Cseligman|accessdate=September 10, 2016}} 5 : NGC objects|Open clusters|Tucana (constellation)|Small Magellanic Cloud|Astronomical objects discovered in 1826 |
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