IC 831
{{Short description|Galaxy in the constellation Coma Berenices}}
{{Notability|Astro|date=April 2024}}
{{Infobox galaxy|name=IC 831|image=File:IC831 - SDSS DR14.jpg|caption=Sloan Digital Sky Survey of IC 831|constellation name=Coma Berenices|z=0.02129|h_radial_v=6,406 km/s
|epoch=J2000
|dist_ly=300 Mly (92 Mpc)|type=E|size=60,000 ly|appmag_v=17.93|names=PGC 43708, 2MASX J12524408+2628135, MCG+05-30-113, AGC 221803, CAIRNS J125244.02+262813.6, SDSS J125244.06+262813.4, [DFO95] 113, LEDA 43708|notes=Galaxy host of supernova iPTF14atg}}
IC 831 is a type E-S0{{Cite web |title=HyperLeda -object description |url=http://atlas.obs-hp.fr/hyperleda/ledacat.cgi?o=IC%20831 |access-date=2024-04-22 |website=atlas.obs-hp.fr}} elliptical galaxy located 300 million light-years away from the Solar System in the constellation of Coma Berenices.{{Cite web |title=Your NED Search Results |url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=32050&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1 |access-date=2024-04-22 |website=ned.ipac.caltech.edu}}{{Cite web |last=Ford |first=Dominic |title=IC831 (Galaxy) |url=https://in-the-sky.org//data/object.php?id=IC831 |access-date=2024-04-22 |website=In-The-Sky.org |language=en}} It is estimated to be 60,000 light-years in diameter and was first discovered on 25 February 1892 by Rudolf Spitaler, an Austrian astronomer.{{Cite web |title=Index Catalog Objects: IC 800 - 849 |url=https://cseligman.com/text/atlas/ic8.htm#ic831 |access-date=2024-04-22 |website=cseligman.com}} It is not known whether it has an active galactic nucleus.
Supernova
Type Ia supernova, iPTF14atg was discovered in IC 831 on May 3, 2015, which was similar to SN 2002es that exploded prior to that, in UGC 2708, a lenticular galaxy.{{Cite web |title=Supernova hits star, results shocking |url=https://www.spacedaily.com/reports/Supernova_hits_star_results_shocking_999.html |access-date=2024-04-22 |website=spacedaily.com}}{{Cite journal |last1=Kromer |first1=M. |last2=Fremling |first2=C. |last3=Pakmor |first3=R. |last4=Taubenberger |first4=S. |last5=Amanullah |first5=R. |last6=Cenko |first6=S. B. |last7=Fransson |first7=C. |last8=Goobar |first8=A. |last9=Leloudas |first9=G. |last10=Taddia |first10=F. |last11=Roepke |first11=F. K. |last12=Seitenzahl |first12=I. R. |last13=Sim |first13=S. A. |last14=Sollerman |first14=J. |date=2016-07-11 |title=The peculiar Type Ia supernova iPTF14atg: Chandrasekhar-mass explosion or violent merger? |journal=Monthly Notices of the Royal Astronomical Society |volume=459 |issue=4 |pages=4428–4439 |doi=10.1093/mnras/stw962 |doi-access=free |issn=0035-8711|arxiv=1604.05730 }} The progenitor type was a white dwarf, in which when it exploded, some of the shockwaves impacted its companion star.{{Cite web |title=Supernova collides with its companion star |url=https://www.sciencedaily.com/releases/2015/05/150520133557.htm |access-date=2024-04-22 |website=ScienceDaily |language=en}} It was discovered by Intermediate Palomar Transient Factory in California.