| 词条 | NGC 503 |
| 释义 |
|name=NGC 503 |image=NGC503 - SDSS DR14.jpg |upright=1.35 |alt=NGC 503 |caption=SDSS view of NGC 503 |epoch=J2000[1] |ra={{RA|01|23|28.4}}[2] |dec={{DEC|+33|19|54}}[2] |constellation name=Pisces[3] |type=E-S0[3] |appmag_b=15.1[3] |appmag_v=14.1[3] |h_radial_v=(5862 ± 21) km/s[1] |dist_ly=265 Mly[4] |z=0.01975 ± 0.00007[1] |size_v=0.9' × 0.7'[3] |notes= |names=PGC 5086, GC 5169, MGC +05-04-040, 2MASS J01232845+3319542 [1][5] }}NGC 503, also occasionally referred to as PGC 5086 or GC 5169, is an elliptical galaxy in the constellation Pisces.[3] It located approximately 265 million light-years from the Solar System[4] and was discovered on 13 August 1863 by German astronomer Heinrich Louis d'Arrest.[5] Observation historyArrest discovered NGC 503 using an 11" reflecting telescope in Copenhagen. His position matches perfectly with PGC 5086. At the time of discovery, he considered the possibility of having observed one of William Herschels discoveries (NGC 495, 496, 499).[6] John Louis Emil Dreyer, creator of the New General Catalogue, described the galaxy as "extremely faint, extremely small" with a "double star 4 arcmin to southwest".[5] See also
References1. ^1 2 3 {{Cite web|url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+503|title=NGC 503|access-date=2017-12-09}} 2. ^1 {{Cite web|url=http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+503|title=Your NED Search Results|website=ned.ipac.caltech.edu|access-date=2017-10-05}} 3. ^1 2 3 4 5 {{Cite web|url=http://spider.seds.org/ngc/revngcic.cgi?NGC503|title=Revised NGC Data for NGC 503|website=spider.seds.org|access-date=2017-10-05}} 4. ^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 5. ^1 2 {{Cite web|url=http://cseligman.com/text/atlas/ngc5.htm#503|title=New General Catalog Objects: NGC 500 - 549|website=cseligman.com|language=en-US|access-date=2017-10-16}} 6. ^{{Cite web|url=http://www.astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm|title=astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm|last=|first=|date=|website=|archive-url=|archive-date=|dead-url=|access-date=}} External links
6 : Lenticular galaxies|Pisces (constellation)|NGC objects|Principal Galaxies Catalogue objects|Astronomical objects discovered in 1863|Discoveries by Heinrich d'Arrest |
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