View source for Astronomy:NGC 1023

{{Short description|Galaxy in the constellation Perseus}}
{{Infobox Galaxy
| name = [[Astronomy:New General Catalogue|NGC]] 1023
| image = Hubble Space Telescope image of NGC 1023.jpg
| caption = [[Astronomy:Hubble Space Telescope|Hubble Space Telescope]] image of NGC 1023
| epoch = [[Astronomy:J2000|J2000]]
| constellation name = [[Astronomy:Perseus (constellation)|Perseus]]
| ra = {{RA|02|40|24.0}}<ref name=ned/>
| dec = {{DEC|+39|03|48}}<ref name=ned/>
| z = 0.002125<ref name=ned>{{cite web
  |title=NASA/IPAC Extragalactic Database
  |work=Results for NGC 1023
  |url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+1023&img_stamp=yes&extend=no
  |access-date=2012-10-17}}</ref>
| h_radial_v = {{nowrap|637 ± 4 [[Metre per second|km/s]]}}<ref name=ned/>
| dist_ly = ~19 M[[Astronomy:Light-year|ly]] (Light Travel-Time redshift-based)<ref name=ned/><br/> 30 to 64 Mly (measured)<ref name=ned/>
| type = SB0<ref name=ned/>
| appmag_v = 10.35<ref name=ned/>
| absmag_v = &minus;21.2<ref name=Young>{{cite journal|bibcode=2012AJ....144..103Y|title=Globular Cluster Systems of Spiral and S0 Galaxies: Results from WIYN Imaging of NGC 1023, NGC 1055, NGC 7332, and NGC 7339 |last1=Young |first1=Michael D. |last2=Dowell |first2=Jessica L. |last3=Rhode |first3=Katherine L. |journal=The Astronomical Journal |year=2012 |volume=144 |issue=4 |page=103 |doi=10.1088/0004-6256/144/4/103 |arxiv=1210.4476 |s2cid=62792507 }}</ref>
| size_v = 8.7' x 3.0'<ref name=ned/>
| names = [[Astronomy:Uppsala General Catalogue|UGC]] 2154, [[Astronomy:Principal Galaxies Catalogue|PGC]] 10123, [[Astronomy:Morphological Catalogue of Galaxies|MCG]]+06-06-073, [[Astronomy:Atlas of Peculiar Galaxies|Arp]] 135
}}

'''NGC 1023''' is a [[Astronomy:Barred lenticular galaxy|barred lenticular galaxy]], a member of the [[Astronomy:NGC 1023 Group|NGC 1023 group of galaxies]] in the Local Supercluster. Distance measurements vary from 9.3 to 19.7 million [[Astronomy:Parsec|parsec]]s (30 to 64 million [[Astronomy:Light-year|light-year]]s).<ref name=ned/> The [[Astronomy:Supermassive black hole|supermassive black hole]] at the core has a mass of {{Val|4.4e7|0.5|ul=solar mass}}.<ref name=Graham2008>{{citation
 | title=Populating the Galaxy Velocity Dispersion - Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values
 | last1=Graham | first1=Alister W. | postscript=.
 | journal=Publications of the Astronomical Society of Australia
 | volume=25 | issue=4 | pages=167–175 | date=November 2008
 | doi=10.1071/AS08013 | bibcode=2008PASA...25..167G |arxiv = 0807.2549 | s2cid=89905 }}</ref> The black hole was discovered by analyzing the dynamics of the galaxy.<ref>{{Cite journal|last1=Bower|first1=G. A.|last2=Green|first2=R. F.|last3=Bender|first3=R.|last4=Gebhardt|first4=K.|last5=Lauer|first5=T. R.|last6=Magorrian|first6=J.|last7=Richstone|first7=D. O.|last8=Danks|first8=A.|last9=Gull|first9=T.|last10=Hutchings|first10=J.|last11=Joseph|first11=C.|date=2001-03-20|title=Evidence of a Supermassive Black Hole in the Galaxy NGC 1023 from the Nuclear Stellar Dynamics|journal=The Astrophysical Journal|volume=550|issue=1|pages=75–86|doi=10.1086/319730|arxiv=astro-ph/0011204|bibcode=2001ApJ...550...75B|s2cid=118949563|issn=0004-637X}}</ref>

NGC 1023 is included in Halton Arp's [[Astronomy:Atlas of Peculiar Galaxies|Atlas of Peculiar Galaxies]], under the category "Galaxies with Nearby Fragments" under the number 135.<ref>{{cite book|last=Arp|first=Halton|title=Atlas of Peculiar Galaxies|publisher=[[Organization:California Institute of Technology|California Institute of Technology]]|location=Pasadena, California|year=1966|url=http://nedwww.ipac.caltech.edu/level5/Arp/Arp_contents.html|access-date=5 Jan 2010}} (webpage includes PDF link)</ref>

NGC 1023 has been estimated to have about 490 [[Astronomy:Globular cluster|globular cluster]]s, consistent with similar early-type galaxies.<ref name=Young/> A number of small galaxies have been found around NGC 1023, the collection of which is labelled the "[[Astronomy:NGC 1023 Group|NGC 1023 Group]]."<ref>{{Cite journal|title=Nearby groups of galaxies. I. The NGC 1023 group.|author=Tully, R. B.|bibcode=1980ApJ...237..390T|date=1980|journal=Astrophysical Journal|volume=237|pages=390–403|doi=10.1086/157881 }}</ref> NGC 1023 has a satellite galaxy named NGC 1023A, which is a [[Astronomy:Magellanic spiral|Magellanic spiral]] galaxy; its globular cluster system is much smaller, estimated to be around six individuals.<ref name=Young/>

== References ==
{{Reflist}}

==External links==

{{Stars of Perseus}}

{{DEFAULTSORT:NGC 1023}}
[[Category:NGC objects|1023]]
[[Category:UGC objects|2154]]
[[Category:Principal Galaxies Catalogue objects|10123]]
[[Category:Arp objects|135]]
[[Category:Perseus (constellation)]]
[[Category:Barred lenticular galaxies]]



{{Sourceattribution|NGC 1023}}