NGC 6647 (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 6647" in Polish language version.

refsWebsite

Global rank Polish rank

low place

2,148^th place

1haroldcorwin.net

low place

low place

2,069^th place

8,256^th place

cseligman.com

Courtney Seligman: NGC 6647. [w:] Celestial Atlas [on-line]. [dostęp 2014-12-10]. (ang.).

haroldcorwin.net

Harold G. Corwin Jr.: NGC 6647. [w:] Notes on the NGC objects, particularly those missing, misidentified, or otherwise unusual [on-line]. 2018-01-24. [dostęp 2018-03-14]. (ang.).

usp.br

astro.iag.usp.br

Wilton Dias et al.: Catalog of Optically Visible Open Clusters and Candidates – List of removed clusters. Departamento de Astronomia, 2014-05-24. [dostęp 2014-12-10].