Hubble's Variable Nebula (NGC 2261)

Hubble's variable nebula is named (like the Hubble telescope itself) after the American astronomer Edwin P. Hubble, who carried out some ofthe early studies of this object. It is a fan-shaped cloud of gas and dust which is illuminated by R Monocerotis (R Mon), the bright star at the bottom end of the nebula. Dense condensations of dust near the star cast shadows out into the nebula, and as they move the illumination changes, giving rise to the variations first noted by Hubble. The star itself, lying about 2,500 light-years from Earth, cannot be seen directly, but only through light scattered off of dust particles in the surrounding nebula. R Mon is believed to have a mass of about 10 times that of the Sun, and to have an age of only 300,000 years. There is probably a symmetrical counterpart of the fan-shaped nebula on the southern side of the star, but it is heavily obscured from view by dust lying between this lobe and our line of sight.

The Hubble Heritage team made this image from observations of R Mon acquired by William Sparks (STScI), Sylvia Baggett (STScI) and collaborators.

Credit:

NASA/ESA and The Hubble Heritage Team (AURA/STScI).

About the Image

NASA press release
NASA caption
Id:opo9935c
Type:Observation
Release date:7 October 1999, 18:00
Size:1472 x 1505 px

About the Object

Name:NGC 2261, R Mon
Type:• Milky Way : Star : Type : Variable
• Milky Way : Nebula : Appearance : Reflection
Distance:2500 light years
Constellation:Monoceros

Image Formats

Large JPEG
453.4 KB
Screensize JPEG
169.3 KB

Wallpapers

1024x768
189.3 KB
1280x1024
301.6 KB
1600x1200
427.0 KB
2048x1536
623.5 KB

Coordinates

Position (RA):6 39 9.05
Position (Dec):8° 45' 14.60"
Field of view:2.46 x 2.52 arcminutes
Orientation:North is 29.5° right of vertical

Colours & filters

BandWavelengthTelescope
Optical
SII
673 nm Hubble Space Telescope
WFPC2
Optical
H-alpha
656 nm Hubble Space Telescope
WFPC2
Optical
R
675 nm Hubble Space Telescope
WFPC2

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