NGC 1

Heinrich d'Arrest discovered NGC 1 on 30 Sep 1861 while testing the 11-inch f/17.5 Merz refractor of the Copenhagen Observatory. He missed nearby NGC 2. This was d'Arrest's first deep sky discovery, though he was uncertain if his object was identical to h4 or h5 (both of which refer to NGC 16). His descriptions (combination of 4 observations) read "faint, small, round, 20", no concentration. In a straight line connecting two stars 11 and 14 mag." Herman Schultz observed NGC 1 three times in 1866 and 1868 with a 9.6-inch refractor at Uppsala and he also missed fainter NGC 2. The NGC 1 and 2 pair are not physically related. NGC 1 lies at a distance of about {{convert|200|e6ly|Mpc|lk=on}} with NGC 2 at roughly {{convert|320|e6ly|Mpc|lk=on}}. {{Cite web|url=http://www.astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm|title=www.astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm|website=Astronomy Mall}}

The initial observers missed NGC 2, which is much fainter. NGC 1 appears to be quite close to NGC 2, in reality however, the two objects are far apart and unrelated. NGC 2 was first observed as a "companion" of NGC 1 by Lawrence Parsons.

File:NGC 1 and NGC 2 from the DESI Legacy Survey.jpg]]

At an estimated 140,000 light-years in diameter, NGC 1 is roughly the same size as our galaxy, the Milky Way, which is believed to be approximately 160,000 light-years across.{{Cite news|url=https://www.space.com/29270-milky-way-size-larger-than-thought.html|title=Size of the Milky Way Upgraded, Solving Galaxy Puzzle|work=Space.com|access-date=2017-11-12}} Although its apparent magnitude of 13.65 makes the galaxy appear too faint to see with the naked eye, its absolute magnitude of -22.08 makes NGC 1 two to three times more luminous than our home galaxy. The galaxy is 4.0 Mly away from the 80,000 light-years wide galaxy UGC 69, its nearest major neighbor.

NGC 1 has a visual size of 1.6' × 1.2'. Being classified as a SABbc class galaxy using the Hubble sequence and the De Vaucouleurs system as an extension, NGC 1 is a spiral galaxy with the presence of a weak nuclear bar and loosely wound arms.{{cite journal|last=de Vaucouleurs|first=Gérard|title=Revised Classification of 1500 Bright Galaxies|journal=Astrophysical Journal Supplement|date=April 1963|volume=8|page=31|doi=10.1086/190084|bibcode = 1963ApJS....8...31D }} Although the central galaxy is only about 90,000 light-years across, a large, diffuse arm extends eastwards from it, possibly from a past merger.

Based on its redshift of approximately 0.015177 and thus recessional velocity of 4450 km/s, the distance of the galaxy from the Solar System can be calculated using Hubble's law. Using current observation data, this places the galaxy at approximately 210 to 215 million light-years from Earth, which is in good agreement with redshift-independent distance estimates of 175 to 245 million light years. An opposing measurement of the galaxy's recessional velocity of 2215 km/s would place the galaxy only about 100 million light-years away. However, this is regarded unlikely by most astronomers and believed to be a misattributed value for a different galaxy.

After being logged as the first object in the General Catalogue, the galaxy is also the first object to be listed in the catalogue's successor, the New General Catalogue.{{cite web

| title=NASA/IPAC Extragalactic Database

| work=Results for NGC 0001

| url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+1&img_stamp=yes&extend=no

| access-date=2006-11-04}} With an original right ascension of {{RA|00|00|4}} at the time of the catalog's compilation (epoch 1860), this object had the lowest right ascension of all the objects in the catalog, making it the first listing in the New General Catalogue as the objects were arranged by right ascension.Dreyer, J. L. E., "New General Catalogue of Nebulae and Clusters of stars (1888)", Memoirs of the Royal Astronomical Society, 49. p3, Royal Astronomical Society, 1962. Since then, the coordinates have shifted, and this object no longer has the lowest right ascension of all the NGC objects.Erdmann, R.E., Jr., The Historically Corrected New General Catalogue of Nebulæ and Clusters of Stars, p12, [http://www.ngcic.org/public_HCNGC/The_HCNGC_intro.pdf retrieved] and [https://web.archive.org/web/20200620062609/https://www.ngcic.org/public_HCNGC/The_HCNGC_intro.pdf archived] 13 June 2008.

NGC 1 is part of the NGC 23 group (also known as LGG 2) that includes at least 6 other galaxies: NGC 23, NGC 26, UGC 69, UGC 79, UGC 110, and UGC 127.{{cite journal | bibcode=1993A&AS..100...47G | title=General study of group membership. II. Determination of nearby groups | last1=Garcia | first1=A. M. | journal=Astronomy and Astrophysics Supplement Series | date=1993 | volume=100 | page=47}}

• Pegasus (constellation)
• List of NGC objects (1–1000)
• Spiral galaxy

{{reflist}}

{{commons category}}

• {{WikiSky}}
• [http://spider.seds.org/ngc/revngcic.cgi?NGC1 SEDS]

{{Ngc5}}

{{Ugc5}}

{{Catalogs|NGC=1|UGC=57|PGC=564}}

{{Pegasus (constellation)}}

{{Sky|00|07|15.8672|+|27|42|28.911|190000000}}

{{DEFAULTSORT:NGC 0001}}

Category:Galaxies discovered in 1861

Category:Intermediate spiral galaxies

Category:Pegasus (constellation)

0001

00057

00564

18610930

Category:Discoveries by Heinrich Louis d'Arrest

+04-01-025

00047+2725