Engraved Hourglass Nebula (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Engraved Hourglass Nebula" in English language version.

refsWebsite

Global rank English rank

18^th place

17^th place

1,342^nd place

1,819^th place

harvard.edu

MyCn stands for Margaret Walton Mayall (My) and Annie Jump Cannon (Cn), their 39-object catalogue was published in 1940 as New Peculiar Spectra in the Harvard College Observatory Bulletin, no. 913; Mayall has a later 139-object catalogue to her name, designated My: New Peculiar Spectra, Harvard College Observatory Bulletin, no. 920.

Corradi, Romano L. M.; Schwarz, Hugo E. (1993). "Coradi & Schwarz (1993)". Astronomy and Astrophysics. 268: 714. Bibcode:1993A&A...268..714C.