Planetary Nebula Kohoutek 1-7 (Abell 10)

Kohoutek 1-7 (Abell 10)
Kohoutek 1-7 (Abell 10): Section of Sloan Digitized Sky Survey [147]


The planetary nebula K 1-7 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: black circular disk 34" x 36" without any details. On the blue print: dark circular disk 32" x 35" with the suggestion of a central star ~19.7m.» [436]

George Ogden Abell listed in 1966 this planetary as Abell 10 and noted: «Nebula appears as a disk with bright stripes.» [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 197-14.1. [146]

Physical Properties

Given distances vary from 3800 pc to 5000 pc. [145]

«Strasbourg-ESO Catalogue of Galactic Planetary Nebulae» Acker et al., 1992 [141]
Designations PN G197.2-14.2: K 1- 7, PK 197-14.1, A 10, ARO 176
Right Ascension (J2000.0) 05h 31m 48s
Declination (J2000.0) +06° 56' 09"
Dimensions 34." (optical), 20." (radio)
Radial Velocity +57.6 ± 3.5 km/s
C-Star Designations AG82 46
C-Star Magnitude B: 20.2
Discoverer KOHOUTEK 1963

Finder Chart

The Planetary Nebula Kohoutek 1-7 is located in the constellation Orion The best time to observe is September to March, when it is highest at night.

Finder Chart Planetary Nebula Kohoutek 1-7 (Abell 10)
Planetary Nebula Kohoutek 1-7 (Abell 10) in constellation Orion. 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]

Visual Observation

400 mm Aperture: Using averted vision the planetary nebula appears in the 13 mm Ethos as a dim disk. No further details or central star could be determined. Using O-III filter the sky background gets darker and the surrounding faint stars disappear. — 400 mm f/4.5 Taurus Dobsonian, Hasliberg, SQM 21.0, 3. 2. 2023, Bernd Nies

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