# Markarian 231

> Seyfert galaxy in the constellation Ursa Major

**Wikidata**: [Q3232769](https://www.wikidata.org/wiki/Q3232769)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Markarian_231)  
**Source**: https://4ort.xyz/entity/markarian-231


## References

1. SIMBAD
2. [Source](http://haroldcorwin.net/rc3/rc39b.csv.gz)
3. VizieR
4. The EFIGI catalogue of 4458 nearby galaxies with detailed morphology
5. Freebase Data Dumps. 2013
6. The most luminous starbursts in the Universe
7. A catalogue of quasars and active nuclei: 13th edition
8. Gaia Data Release 2
9. The Two Micron All Sky Survey (2MASS)
10. The SDSS Photometric Catalog, Release 7
11. Hunting for supermassive black holes in nearby galaxies with the Hobby-Eberly telescope
12. The Star Formation Reference Survey. I. Survey description and basic data