# Kepler-309

> star in the constellation Cygnus

**Wikidata**: [Q21207884](https://www.wikidata.org/wiki/Q21207884)  
**Source**: https://4ort.xyz/entity/kepler-309


## References

1. SIMBAD
2. Characterizing the cool Kepler objects of interests. New effective temperatures, metallicities, masses, and radii of low-mass Kepler planet-candidate host stars
3. Extrasolar Planets Encyclopaedia
4. Photometric amplitude distribution of stellar rotation of KOIs--Indication for spin-orbit alignment of cool stars and high obliquity for hot stars
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Gaia Early Data Release 3
7. Gaia Data Release 2
8. The California-Kepler Survey. I. High-resolution Spectroscopy of 1305 Stars Hosting Kepler Transiting Planets
9. A Spectroscopic Analysis of the California-Kepler Survey Sample. I. Stellar Parameters, Planetary Radii, and a Slope in the Radius Gap