NGC 3750
{{Short description|Galaxy in the Copeland Septet}}
{{Infobox galaxy|name=NGC 3750|image=File:NGC 3750.jpg|caption=NGC 3750 with NGC 3753 beneath it|constellation name=Leo|ra=11h 37m 51.637s|dec=+21d 58m 27.26s|z=0.030258|h_radial_v=9,071 km/s|dist_ly=450 Mly (138 Mpc)|group_cluster=Copeland Septet|appmag_v=13.9|sbrightness=23.7 mag/arcsec|type=SAB0?, E-S0|size=156,000 ly|names=PGC 36011, CGCG 127-009, VV 282c, MCG +04-28-008, Copeland Septet NED04, HCG 057C, 2MASS J11375165+2158272, SDSS J113751.63+215827.2, NSA 112843, 2XMM J113751.7+215827, LEDA 36011|epoch=J2000}}
NGC 3750 is a barred lenticular galaxy{{Cite web |title=HyperLeda -object description |url=http://atlas.obs-hp.fr/hyperleda/ledacat.cgi?o=NGC%203750 |access-date=2024-05-02 |website=atlas.obs-hp.fr}} located in the constellation of Leo.{{Cite web |last=Astronomy |first=Go |title=NGC 3750 {{!}} galaxy in Leo {{!}} NGC List {{!}} GO ASTRONOMY |url=https://www.go-astronomy.com/ngc.php?ID=3978 |access-date=2024-05-02 |website=Go-Astronomy.com |language=en-US}}{{Cite web |title=NGC 3750 |url=https://spider.seds.org/ngc/ngc.cgi?CatalogNumber=NGC+3750 |access-date=2024-05-02 |website=spider.seds.org}} It is located 450 million light years away from Earth.{{Cite web |title=Your NED Search Results |url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=56902&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1 |access-date=2024-05-02 |website=ned.ipac.caltech.edu}} and was discovered by Ralph Copeland on February 9, 1874.{{Cite web |title=New General Catalog Objects: NGC 3750 - 3799 |url=https://cseligman.com/text/atlas/ngc37a.htm |access-date=2024-05-02 |website=cseligman.com}}
NGC 3750 has a surface brightness of magnitude 23.7 and is classified a LINER galaxy by SIMBAD, meaning it has a nucleus, presenting an emission spectrum characterized by broad lines of weakly ionized atoms.{{Cite web |title=NGC 3750 - LINER-type Active Galaxy Nucleus |url=https://simbad.u-strasbg.fr/simbad/sim-basic |access-date=2024-05-02 |website=simbad.u-strasbg.fr}}
Copeland Septet
NGC 3750 is a member of the Copeland Septet which is made up of 7 seven galaxies discovered by Copeland.{{Cite web |last=Bakich |first=Michael E. |date=2024-01-01 |title=Copeland's Septet |url=https://www.astronomy.com/science/copelands-septet/ |access-date=2024-05-02 |website=Astronomy Magazine |language=en-US}} The other members are NGC 3745, NGC 3746, NGC 3748, NGC 3751, NGC 3753 and NGC 3754.{{Cite web |title=Copeland's Septet (Hickson Compact Group 57) – Constellation Guide |url=https://www.constellation-guide.com/copelands-septet/ |access-date=2024-05-02 |website=www.constellation-guide.com}}
Halton Arp noticed the galaxies in the group, whom he published in his article in 1966.{{Cite web |title=NED Search Results for ARP 320 |url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=Arp+320&extend=yes&out_csys=Equatorial&out_equinox=B1950.0&obj_sort=RA+or+Longitude&zv=z&zv_breaker=10000.0 |access-date=2024-05-02 |website=ned.ipac.caltech.edu}} This group is designated as Arp 320 along with another galaxy, PGC 36010.{{Cite web |title=Copeland's Septet (Arp 320) - Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets, Telescopes |url=https://cs.astronomy.com/asy/m/galaxies/492462.aspx |access-date=2024-05-02 |website=cs.astronomy.com}}
This group was also observed by Paul Hickson whom he included in his article in 1982.{{Cite journal |last=Hickson |first=P. |date=1982-04-01 |title=Systematic properties of compact groups of galaxies. |url=https://ui.adsabs.harvard.edu/abs/1982ApJ...255..382H |journal=The Astrophysical Journal |volume=255 |pages=382–391 |doi=10.1086/159838 |bibcode=1982ApJ...255..382H |issn=0004-637X}} The group is known as Hickson 57, in which NGC 3750 is designated is HCG 57C.{{Cite web |title=Data from Revised NGC and IC catalogue by Wolfgang Steinicke - NGC 3700 to 3799 |url=http://astrovalleyfield.ca/AstronomieCompl/NGC%20et%20autres/WolfgangS/N3700_exc_web.htm |access-date=2024-05-02 |website=astrovalleyfield.ca}}