Planetary Nebula Kohoutek 1-11 (Abell 22)
History
The planetary nebula K 1-11 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: nebula of a rhomboid shape and of mean densitiy with two opposite condensaton regions. Dimensions of the rhomboid: 105" in base-line, 68" in width. Central star mR ~20 mag. On the blue print: faint nebula of the same dimensions; central star mB = 19.2 mag.» [436]
George Ogden Abell listed in 1966 this planetary as number 22 and noted: «Appears as a small parallelogram surrounded by a large 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 215+11.1. [146]
Physical Properties
| Designations | PN G215.6+11.1: K 1-11, PK 215+11.1, A 22, ARO 133 |
| Right Ascension (J2000.0) | 07h 36m 07s |
| Declination (J2000.0) | +02° 42' 17" |
| Dimensions | 84." (optical) |
| Radial Velocity | +26.8 ± 2.8 km/s |
| C-Star Designations | 1A 0733 +02, AG82 84, CSI +02 -07335, DDO 45, UBV 7306 |
| C-Star Magnitude | U: 18.07, B: 19.24, V: 19.59 |
| Discoverer | KOHOUTEK 1963 |
Finder Chart
The Planetary Nebula Kohoutek 1-11 is located in the constellation Canis Minor The best time to observe is October to April, when it is highest at night.
