# OJ 287

> BL Lac object in the constellation Cancer

**Wikidata**: [Q580394](https://www.wikidata.org/wiki/Q580394)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/OJ_287)  
**Source**: https://4ort.xyz/entity/oj-287


## References

1. SIMBAD
2. VizieR
3. Freebase Data Dumps. 2013
4. The VSOP 5 GHz continuum survey: the prelaunch VLBA observations
5. Hard X-ray properties of blazars
6. Survey of instantaneous 1-22 GHz spectra of 550 compact extragalactic objects with declinations from $-30^\circ$ to $+43^\circ$
7. Evidence for very large-scale coherent orientations of quasar polarization vectors
8. Optical morphology of bright quasars on images taken with 1.2 m Schmidt cameras
9. The ROSAT AGN content of the 87GB 5 GHz survey: bulk properties of previously optically identified sources
10. A catalogue of quasars and active nuclei: 13th edition
11. CGRaBS: An All‐Sky Survey of Gamma‐Ray Blazar Candidates
12. Gaia Data Release 2
13. The Two Micron All Sky Survey (2MASS)
14. The SDSS Photometric Catalog, Release 7
15. The Star Formation Reference Survey. I. Survey description and basic data