DEEP SKY
  Gavin James
  07808 480621
  gavin@gjmultimedia.co.uk
 
Astronomy Deep Sky     << previous next >>
 
NGC 2174 - The Monkey Head Nebula

Located in the constellation of Orion, The Monkey Head Nebula is an emission nebula. Emission nebulae are clouds of ionised gases that emit their own light at various optical wavelengths, hence the name. These nebulae vary greatly in density, ranging from millions of atoms per cubic centimetre to only a few. They occur when interstellar gas clouds, comprised dominantly of neutral hydrogen atoms, are ionised by nearby stars, most commonly B and O type stars. The vast quantities of ultraviolet light with high energy delocalise the electrons from the hydrogen nuclei, that later recombine in an ‘excited state' and then emit photons of light when they de-excite.


Other forms of nebulae include absorption nebulae, also known as ‘dark nebulae,’ which are so dense that they obscure all light from behind them, hence the name. Another intergalactic object from the nebulae family is the reflection nebula, which occurs when its gas is not sufficiently ionised by close by stars to form an emission nebula, however adequate amounts of energy are scattered to make it visible.


Many have heard of The Orion Nebula, located in the ‘sword’ of the asterism. NGC 2174 is located near Orion’s head, above Betelgeuse and covers an area larger than the full Moon. However, unlike The Orion Nebula, it cannot be viewed by the naked eye and requires binoculars at the very least to be seen.

NGC 2174 is often described by the phrase ‘stars versus mountains of gas, and the stars are winning.’ This refers to the stellar nurseries that are the vast collections of gas, plasma and dust in which the stars are formed. However, when these baby stars grow, they release huge amounts of energy and stellar winds that consume, evaporate and disperse that clouds. So yes, the stars are winning.

Research Assistant: Finlay Stuart

NAME:
CATALOGUE:
OBJECT TYPE:
CONSTELLATION:
DISTANCE:
APPARENT MAGNITUDE:
APPARENT SIZE:
DIAMETER:
DISCOVERY:
BEST VIEWED IN:
RIGHT ASCENSION:
DECLINATION:
TELESCOPE:
DATA GATHERED:
EXPOSURES:

TOTAL TIME:

 

The Monkey Head Nebula
NGC 2174
Emission Nebula
Orion
6,400 light years
+6.8
40 arcminutes
16 light years
1779, Charles Messier
January
06h 10m 59s
+20º 29’ 45”
SkyWatcher Esprit 100ED
9 nights in Dec 2021 & Jan 2022
Hα = 24 x 1800s
OIII = 24 x 1800s
24 hours

 

The entire contents of this website are copyright Gavin James, GJMultimedia © 2022 - strictly no copying without permission - all rights reserved