Planetary Nebula Kohoutek 1-13 (Abell 25)

Kohoutek 1-13 (Abell 25)
Kohoutek 1-13 (Abell 25): Section of DSS2 [147]


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 mR = 19.3 mag. On the blue print: elliptic nebula 150" x 145" of very low density, two condensations are almost imperceptible. Central star mB = 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]

Physical Properties

According to Simbad the heliocentric distance is ~760 pc and magnitudes through different line filters: B 18.051; V 18.425; R 18.592; I 18.846. [145]

«Strasbourg-ESO Catalogue of Galactic Planetary Nebulae» Acker et al., 1992 [141]
Designations PN G224.3+15.3: K 1-13, PK 224+15.1, A 25, ARO 246
Right Ascension (J2000.0) 08h 06m 45s
Declination (J2000.0) -02° 52' 43"
Dimensions 165." (optical)
Radial Velocity +16.0 km/s
Expansion Velocity 22. (O-III) km/s
C-Star Designations AG82 97, CSI -02 -08042, UBV 7761
C-Star Magnitude U: 17.65, B: 18.80, V: 18.94
Discoverer KOHOUTEK 1963

Finder Chart

The Planetary Nebula Kohoutek 1-13 is located in the constellation Monoceros, about 28 arcminutes west of 4.3 mag binary star ζ Monocerotis. The best time to observe is October to March, when it is highest at night.

Finder Chart Planetary Nebula Kohoutek 1-13 (Abell 25)
Planetary Nebula Kohoutek 1-13 (Abell 25) in constellation Monoceros. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

More Objects Nearby (±15°)