# HD 20781

> star

**Wikidata**: [Q14405105](https://www.wikidata.org/wiki/Q14405105)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/HD_20781)  
**Source**: https://4ort.xyz/entity/hd-20781


## References

1. SIMBAD
2. Source
3. Extrasolar Planets Encyclopaedia
4. Freebase Data Dumps. 2013
5. The Tycho-2 catalogue of the 2.5 million brightest stars
6. Third U.S. Naval Observatory CCD Astrograph Catalog (UCAC3)
7. The DENIS database, 3rd Release
8. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
9. Gaia Early Data Release 3
10. The HARPS search for southern extra-solar planets. XLIV. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions
11. Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES) I. Code description and dwarf stars catalogue
12. Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
13. Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program. Galactic stellar populations and planets
14. SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs
15. Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program
16. On the long-term correlation between the flux in the Ca II H & K and H{alpha} lines for FGK stars
17. Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur
18. Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties