Planetary Nebula Minkowski 2-55

Minkowski 2-55
Minkowski 2-55: Planetary nebula in Cepheus; 500 mm Cassegrain 3625 mm f/7.2; SBIG STL11K; 340+90+90+90 min LRGB; Bernese Highlands; © 2015 Radek Chromik


The planetary nebula Minkowski 2-55 (PK 116+8.1) was discovered in 1947 by the German-American astronomer Rudolph Minkowski on photo plates in the Newton focus of the 60 inch or 100 inch telescope on Mount Wilson. Minkowski also contributed to the creation of the «National Geographic Society - Palomar Observatory Sky Survey» (POSS). [454]

Physical Properties

The distance from M 2-55 is 2232 pc. [145]

«Strasbourg-ESO Catalogue of Galactic Planetary Nebulae» Acker et al., 1992 [141]
DesignationsPN G116.2+08.5: M 2-55, PK 116+08.1, ARO 382, VV 287, VV' 577
Right Ascension (J2000.0)23h 31m 52s
Declination (J2000.0)70° 22' 15"
Dimensions 39." (optical), 40." (radio)
Radial Velocity-22.6 km/s ± 2.9 km/s
C-Star DesignationsAG82 453
C-Star Magnitude21.2 mag (B filter), 21.1 mag (V filter)
DiscovererMINKOWSKI 1947

Finder Chart

The planetary nebula Minkowski 2-51 is located in the constellation Cepheus. The best time to observe is May to December, when it is highest at night.

Chart Minkowski 2-55
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]


141Strasbourg-ESO Catalogue of Galactic Planetary Nebulae; A. Acker, F. Ochsenbein, B. Stenholm, R. Tylenda, J. Marcout, C. Schohn; European Southern Observatory; ISBN 3-923524-41-2 (1992); (2021-02-18)
145SIMBAD astronomical database;
149SkySafari 6 Pro, Simulation Curriculum;
160The STScI Digitized Sky Survey;
454«NEW EMISSION NEBULAE (II)» R. Minkowski; Publications of the Astronomical Society of the Pacific, Volume 59, Number 350; 1947; DOI:10.1086/125962