History

The planetary nebula K 1-13 was discovered in 1962 by the Czech astronomer Luboš Kohoutek on the photo plates of the «Palomar Observatory Sky Survey» (POSS). He wrote: «On the red print: elliptic nebula 197" x 150" of low density with two large symmetrical condensations existing at the periphary, in the direction of the minor axis, and with the suggestion of a ring. Central star m_R = 19.3 mag. On the blue print: elliptic nebula 150" x 145" of very low density, two condensations are almost imperceptible. Central star m_B = 17.9 mag.» ^[436]

George Ogden Abell listed in 1966 this planetary as number 25 and described it with «e» as «a ring with gaps (incomplete ring)» ^[332]

The nebula was later included in the «Catalog of Galactic Planetary Nebulae» (CGPN) compiled by Luboš Perek and Luboš Kohoutek in 1967 and was given the designation PK 224+15.1, derived from the galactic coordinates and the order of PN's discovered in the 1°x1° square. ^[146]

The lesser known designation ARO 246 originates from 1971 survey of microwave radiation from planetary nebulae conducted by Canadian radioastronomer Lloyd A. Higgs using the 46-metre Algonquin Radio Observatory in Ontario, Canada. ^{[136, 137]}