# K2-138

> star in the constellation Aquarius

**Wikidata**: [Q47471235](https://www.wikidata.org/wiki/Q47471235)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/K2-138)  
**Source**: https://4ort.xyz/entity/k2-138


## References

1. SIMBAD
2. Extrasolar Planets Encyclopaedia
3. Fourth USNO CCD Astrograph Catalog
4. The DENIS database, 3rd Release
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. The SDSS Photometric Catalog, Release 7
7. The seventh data release of the Sloan Digital Sky Survey
8. Gaia Early Data Release 3
9. Gaia Data Release 2
10. The K2-138 System: A Near-resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists
11. The Sixth Data Release of the Radial Velocity Experiment (RAVE). II. Stellar Atmospheric Parameters, Chemical Abundances, and Distances
12. The radial velocity experiment (RAVE): fourth data release