| 词条 | NGC 172 |
| 释义 |
| name = NGC 172 | image = NGC172 - SDSS DR14.jpg | upright = 1.35 | alt = NGC 172 | caption = NGC 172 as seen on SDSS | epoch = J2000 | ra = {{RA|00|37|13.6}}[1] | dec = {{DEC|-22|35|13}}[1] | constellation name = Cetus | z = 0.010164[1] | dist_ly = 136 Mly[2] | type = G[1] | appmag_v = 15.09[1] | size_v = 2.0' × 0.3'[1] | notes = | names = ESO 474- G 005, MCG -04-02-027, 2MASX J00371359-2235132, 2MASXi J0037135-223513, IRAS 00348-2251, IRAS F00347-2012, ESO-LV 4740050, 6dF J0037136-223513, PGC 2228.[1] }}NGC 172 is a spiral galaxy located around 136 million light-years away[2] in the constellation Cetus.[1] It was discovered in 1886 by astronomer Frank Muller.[3] See also
References1. ^1 2 3 4 5 6 7 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 0172 | url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+172&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}} 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. ^{{cite web|title=New General Catalog Objects: 150 - 199|url=http://cseligman.com/text/atlas/ngc1a.htm#172|website=cseligman.com|accessdate=2018-02-13}} External links
4 : NGC objects|Cetus (constellation)|Astronomical objects discovered in 1886|Discoveries by Frank Muller |
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