IC 4593
| Nebula | |
|---|---|
IC 4593 imaged by astronomer Judy Schmidt | |
| Observation data: J2000.0 epoch | |
| Class | O7f |
| Right ascension | 16h 11m 44.5s |
| Declination | +12° 04′ 17″ |
| Distance | 7,900 ly |
| Apparent magnitude (V) | 10.7 |
| Apparent dimensions (V) | 0.22 × 0.22 |
| Constellation | Hercules |
IC 4593 (also known as the White-Eyed Pea Nebula) is a planetary nebula in the constellation Hercules. It was first discovered in 1907 by astronomer Williamina Fleming. The nebula is approximately 0.96 light-years across. At the center of the nebula is a hot white dwarf that's known as HD 145649, which is an O-type star with a spectral type of O7f. The temperature of the white dwarf is approximately 30,000 to 40,000 K.
A study published in 2020 found that there are bubbles of extremely hot gas in its inner cavities, with the gas heating to over a million degrees. They were formed because of stellar winds colliding with previously expelled gas.