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Lynds Catalog of Dark Nebulae

(LDN, L)
(1950s/1960s list of dark nebulae found on Palomar plates)

Lynds Catalog of Dark Nebulae (abbreviated LDN or sometimes L) is a list assembled by Beverly Lynds in the 1950s-1960s of dark Nebulae found on plates of the Palomar Observatory Sky Survey. Among them are clouds currently under study regarding Star Formation, such as LDN 1689.

LDNLDN 1689Lynds Catalog of Dark Nebulae 

Referenced by:
LDN 1689
Taurus Molecular Cloud 1 (TMC-1)