# Q77420709

> white dwarf in the constellation Ursa Major

**Wikidata**: [Q77420709](https://www.wikidata.org/wiki/Q77420709)  
**Source**: https://4ort.xyz/entity/q77420709


## References

1. SIMBAD
2. White dwarf-main sequence binaries identified within SDSS DR7 and UKIDSS DR5
3. Post-common envelope binaries from SDSS - VII. A catalogue of white dwarf-main sequence binaries
4. SDSS DR7 white dwarf catalog
5. The Fifth Data Release of the Sloan Digital Sky Survey
6. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
7. The SDSS Photometric Catalog, Release 7
8. The WIRED survey. II. Infrared excesses in the SDSS DR7 white dwarf catalog
9. Gaia Data Release 2
10. Spectral analysis of 636 white dwarf-M star binaries from the Sloan Digital Sky Survey
11. Constraining the age-activity relation for cool stars: the Sloan Digital Sky Survey Data Release 5 low-mass star spectroscopic sample