Planetary Nebula IC 4593

IC 4593
IC 4593: Image taken with Hubble Space Telescope. © 2007 NASA, ESA, and The Hubble Heritage Team (STScI/AURA) [589]


This planetary nebula was discovered in 1907 by Williamina Fleming. She first worked as a maid for Edward Pickering, Professor of Astronomy at Harvard and later became one of the most famous female astronomers of the 19th century. She inspected plates taken with the 8 inch f/5.5 refractor at the Harvard College Observatory. The telescope was equipped with an objective prism and the planetary nebula was identified by its spectrum. [196, 277]

Physical Properties

«Strasbourg-ESO Catalogue of Galactic Planetary Nebulae» Acker et al., 1992 [141]
Designations PN G025.3+40.8: IC 4593, PK 25+40.1, ARO 27, VV 79, VV' 133
Right Ascension (J2000.0) 16h 11m 44s
Declination (J2000.0) +12° 04' 27"
Dimensions 13." (optical)
Distance 0.85 kpc
Radial Velocity +22.0 ± 0.5 km/s
Expansion Velocity 12.5 (O-III) 12. (N-II) km/s
C-Star Designations AG +12 1684, AG82 199, BD +12 2966, CSV 101560, GCRV 9312, HD 145649, NSV 7526, PLX 3676, SV* ZI 1218, TD1 18957
C-Star Magnitude B: 11.05, V: 11.20
C-Star Spectral Type O5 f(H)
Discoverer FLEMING 1907

Finder Chart

The planetary nebula IC 4593 is located in the constellation Hercules. The small double star HD 145730 A/B helps as an orientation point in the large field eyepiece. The best observation time is from March to October.

Finder Chart Planetary Nebula IC 4593
Planetary Nebula IC 4593 in constellation Hercules. 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: In the 21 mm Ethos eyepiece (85x) this small PN appears star-shaped. At higher magnification (9 mm Nagler, 200x) it reveals itself as a diffuse, bluish nebula with a central star. — 400 mm f/4.5 Taurus Dobsonian, Hasliberg, 18. 8. 2023, SQM 21.2, Bernd Nies

Objects Within a Radius of 20°