| Home > Nubulae > Planetary Nebulae > NGC2392 |
NGC2392
Eskimo Nebula
Planetary Nebula
| Right Ascension | 7h 29m 10s | Best Seen | 1/15-4/15 |
| Declination | 20° 54' 42" | Magnitude | 9.0 |
| Constellation | Gemini | ||
Actual |
Compared to ... |
|
| Distance | 3,000 ly | -- |
| Actual Brightness of central star | -- | 44 (Sun) |
| Magnitude of central star | 10 | |
| Spectral Type of central star | O6 dwarf | G2 V (Sun) |
| Surface Temperature of star | 71,500° | 6.9 (Sun) |
| Age | 10,000 years | |
| Density (gram/cubic cm) | -- | -- |
What To Look For Through The Telescope
-
Recommended eyepiece: 24mm
-
As you look through the telescope you will see two stars that are about the same brightness. One of them will appear fuzzy. The fuzzy one is the planetary nebula.
-
You can ask people to compare the appearance of the nebula and the star.
NGC2392 "Eskimo Nebula" Information
-
This nebula was discovered in 1787 by William Herschel, the same astronomer who discovered Uranus.
-
The gas in the nebula is expanding outward with a velocity of about 68 miles per second.
| Home > Nebulae > Planetary Nebulae > NGC2392 > References | top |
References
| Item | Updated | Notes |
| Coordinates | 2003-01-08 | updated with SIMBAD |
| Distance | 2003-01-08 | previously 3000 ly – BUT says 5000 at http://hubblesite.org/newscenter/archive/2000/07/text and http://antwrp.gsfc.nasa.gov/apod/ap020407.html |
| Diameter | 2003-01-08 | previously 0.6 ly / 36,000 AU’s – BUT this comes from distance of 3,000 ly... all distance info I’ve found says 5000 ly; with ang diam 0.7 arcmin, this corresponds to 1.01 ly http://www.kopernik.org/images/archive/n2392.htm |
| Actual Brightness – Star | 2003-01-08 | close enough to http://www.kopernik.org/images/archive/n2392.htm |
| Magnitude – Star | 2003-01-08 | close enough to http://www.kopernik.org/images/archive/n2392.htm |
| Spectral Type – Star | 2003-01-08 | previously O8 dwarf – but SIMBAD says O6 |
| Surface Temperature – Star | 2003-01-08 | previously said 40,000 K – changed to F – BUT cannot find support, but looks OK |
| Age | 2003-01-08 | previously 1,700 years – but says gas composed outer layers of star 10,000 years ago http://antwrp.gsfc.nasa.gov/apod/ap020407.html |
| Density | -- | |
| Other Information | 2003-01-08 | previously said “The nebula’s age of about 1,700 years makes it one of the youngest planetary nebulae known.” – BUT nebula is 10,000 years old, may not be one of youngest https://amazing-space.stsci.edu/resource_page/129/stars_stellar_evolution/topic#resource_tab Found no support for 68 miles per second speed, but sounds OK http://spider.seds.org/spider/Misc/n2392.html |
| Distance | 2010-11-16 | this is widely varying, depending on the source but most seem to agree on something close to 3,000 ly. |
| Diameter | 2010-11-16 | based on the updated distance information, the diameter is 36,000 AU or about 0.6 ly |