Sextans B

Noirlab_noirlab2115a_1024

noirlab_noirlab2115a April 28th, 2021

Credit: KPNO/NOIRLab/NSF/AURAData obtained and processed by: P. Massey (Lowell Obs.), G. Jacoby, K. Olsen, & C. Smith (AURA/NSF) Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani (NSF’s NOIRLab) & D. de Martin (NSF’s NOIRLab)

Sextans B is an irregular dwarf galaxy, meaning that it is irregularly shaped and smaller than our galaxy, the Milky Way. It lies around 4.5 million light-years from Earth and is located in the constellation Sextans in the southern sky. Captured with the Nicholas U. Mayall 4-meter Telescope, this image of Sextans B features red-colored star-forming regions near the galaxys center. Surrounding the galaxy are several bright stars that are located much closer to us in our galaxy, identified by the crisscross patterns created by light interacting with the structure of the telescope, as well as numerous fuzzy-looking background galaxies that appear small because they are much farther away than Sextans B.

Provider: NOIRLab

Image Source: https://noirlab.edu/public/images/noirlab2115a/

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

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
Sextans B
Noirlab_noirlab2115a_128
 

Position Details

Position (ICRS)
RA = 9h 59m 59.5s
DEC = 5° 19’ 43.3”
Orientation
North is up
Field of View
15.7 x 9.8 arcminutes
Constellation
Sextans

Color Mapping

  Telescope Spectral Band Wavelength
Red Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (SII) 673.0 nm
Red Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (H-alpha) 657.0 nm
Orange Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (I) 820.0 nm
Yellow Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (R) 651.0 nm
Green Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (V) 538.0 nm
Cyan Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (OIII) 502.0 nm
Blue Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (B) 438.0 nm
Purple Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (U) 355.0 nm
Spectrum_base
Red
Red
Orange
Yellow
Green
Cyan
Blue
Purple
Noirlab_noirlab2115a_1280
×
ID
noirlab2115a
Subject Category
Subject Name
Sextans B
Credits
KPNO/NOIRLab/NSF/AURAData obtained and processed by: P. Massey (Lowell Obs.), G. Jacoby, K. Olsen, & C. Smith (AURA/NSF) Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani (NSF’s NOIRLab) & D. de Martin (NSF’s NOIRLab)
Release Date
2021-04-28T14:00:00
Lightyears
Redshift
Reference Url
https://noirlab.edu/public/images/noirlab2115a/
Type
Observation
Image Quality
Distance Notes
Facility
Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope
Instrument
Mosaic 1, Mosaic 1, Mosaic 1, Mosaic 1, Mosaic 1, Mosaic 1, Mosaic 1, Mosaic 1
Color Assignment
Red, Red, Orange, Yellow, Green, Cyan, Blue, Purple
Band
Optical, Optical, Optical, Optical, Optical, Optical, Optical, Optical
Bandpass
SII, H-alpha, I, R, V, OIII, B, U
Central Wavelength
673, 657, 820, 651, 538, 502, 438, 355
Start Time
Integration Time
Dataset ID
None, None, None, None, None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
149.99795195, 5.32869875794
Reference Dimension
3482.0, 2183.0
Reference Pixel
1741.0, 1091.5
Scale
-7.49340259298e-05, 7.49340259298e-05
Rotation
-0.02
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
noirlab2115a
Metadata Date
2020-01-24T08:01:45+01:00
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.