Planetary nebula · Hercules
IC 4593 White-eyed Pea Nebula
mag 10.742″ across
About
IC 4593, the White-eyed Pea Nebula, is a planetary nebula of magnitude 10.7 in Hercules, about 42″ across.
How to find it
- IC 4593 is in the constellation Hercules.
- Best evenings: around early July it is highest at about 9 pm (10 pm in summer time); a month earlier, two hours later.
- Where on Earth: it is seen well, at least 10° up, from north of 68° S.
When it rises and sets tonight, how high it climbs and how much the Moon gets in the way are worked out in your browser for your place.
What you will see
- EyesNot visible to the naked eye.
- Binoculars (10×50)Too faint for binoculars.
- Telescope (6–8 inch)A faint round glow — a UHC or OIII filter makes it much easier.
For a dark country sky with no Moon. From a city, faint galaxies and nebulae can disappear completely.
Facts
| Designations | IC 4593, PK 25+40 1, PN G025.3+40.8 |
|---|---|
| Type | Planetary nebula |
| Magnitude | 10.7The smaller the number, the brighter. |
| Apparent size | 42″the full Moon is 31′ across |
| Surface brightness | ≈ 18.6 mag/arcsec²Estimate from the magnitude and size, per square arcsecond. |
| Constellation | Hercules |
| Right ascension (J2000) | 16h 11m 44.5s |
| Declination (J2000) | +12° 04′ 17″ |
Sources and credits
Catalog data: OpenNGC by Mattia Verga, CC BY-SA 4.0, and d3-celestial by Olaf Frohn, BSD 3-Clause. All data sources →