NGC 2261: Hubbleʼs Variable Nebula

Noirlab_noao-n2261westphal_1024

noirlab_noao-n2261westphal June 11th, 2014

Credit: KPNO/NOIRLab/NSF/AURA/Carole Westphal/Adam Block

Comet!? No- this object was put into the correct category as a diffuse nebula. The bright star at the tip of the cloud of gas is called R Monocerotis. It is a variable star that is actually in the background of the cloud of gas. The gas cloud is around 1 light year in extent and due to the variability of R Mon, the entire nebula changes in its brightness. However, R Mon is mysterious because the mechanism of its variations is uncertain. The most accepted explanation is that there exist clouds of gas and dust very close to R Mon and these clouds eclipse R Mon (as they orbit about it) casting shadows onto the foreground nebula. This image was taken as part of Advanced Observing Program (AOP) program at Kitt Peak Visitor Center during 2014.

Provider: NOIRLab

Image Source: https://noirlab.edu/public/images/noao-n2261westphal/

Curator: NSF's NOIRLab, Tucson, AZ, USA

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
NGC 2261
Noirlab_noao-n2261westphal_128
 

Position Details

Position (ICRS)
RA = 6h 38m 54.2s
DEC = 8° 43’ 58.6”
Orientation
North is 164.7° CW
Field of View
12.4 x 8.3 arcminutes
Constellation
Monoceros

Color Mapping

  Telescope Spectral Band Wavelength
Luminosity KPNO-VC-0.5m (Other CCD) Optical (Broad Band) 555.0 nm
Blue KPNO-VC-0.5m (Other CCD) Optical (B) 438.0 nm
Green KPNO-VC-0.5m (Other CCD) Optical (G) 475.0 nm
Red KPNO-VC-0.5m (Other CCD) Optical (R) 625.0 nm
Spectrum_base
Luminosity
Blue
Green
Red
Noirlab_noao-n2261westphal_1280
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ID
noao-n2261westphal
Subject Category
Subject Name
NGC 2261
Credits
KPNO/NOIRLab/NSF/AURA/Carole Westphal/Adam Block
Release Date
2014-06-11T14:36:13
Lightyears
Redshift
Reference Url
https://noirlab.edu/public/images/noao-n2261westphal/
Type
Observation
Image Quality
Distance Notes
Facility
Visitor Center 0.5-meter Telescope, Visitor Center 0.5-meter Telescope, Visitor Center 0.5-meter Telescope, Visitor Center 0.5-meter Telescope
Instrument
Other CCD, Other CCD, Other CCD, Other CCD
Color Assignment
Luminosity, Blue, Green, Red
Band
Optical, Optical, Optical, Optical
Bandpass
Broad Band, B, G, R
Central Wavelength
555, 438, 475, 625
Start Time
Integration Time
Dataset ID
None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
99.7256885599, 8.73293431039
Reference Dimension
1638.0, 1104.0
Reference Pixel
352.608181, 630.877399445
Scale
-0.000126025683314, 0.00012574506149
Rotation
-164.71966793715
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
NSF's NOIRLab
URL
https://noirlab.edu
Name
Email
Telephone
Address
950 North Cherry Ave.
City
Tucson
State/Province
AZ
Postal Code
85719
Country
USA
Rights
Creative Commons Attribution 4.0 International License
Publisher
NSF's NOIRLab
Publisher ID
noirlab
Resource ID
noao-n2261westphal
Metadata Date
2021-09-14T08:44:11-05:00
Metadata Version
1.1
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Detailed color mapping information coming soon...

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There is no distance meta data in this image.