Difference between revisions of "Filters"

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A common system of filters is available for use with the CCD cameras at Moore and Mt. Kent Observatory.  With some exceptions, noted below, all filters are mounted in wheels that may be changed on request.  
A common system of filters is available for use with the CCD cameras at Moore, Mt. Kent and Mt. Lemmon observatories.  With some exceptions, noted below, all filters are mounted in wheels that may be changed on request.  
 
 
 




== Sloan Photometry  ==
== Sloan Photometry  ==


There are 4 sets of Sloan filters for use at the RC24, CDK20N, CDK20S, and CDK700 telescopes.  Each set is in a wheel with 6 openings assigned serially
There is a set of Sloan filters for each of the ULMT, MORC24, CDK20N, CDK20S, and CDK700 telescopes.  Each set excepton ULMT is in a wheel with 6 openings assigned serially.  
With 4 separate sets it is possible for all telescopes to be used for photometry at any time.




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*(6) Open
*(6) Open


[[File:Sloan_griz_ad.jpg|400px|center]]
Currently the ULMT wheel has 10 openings including the Sloan filters, color imaging filters, H-alpha and [OIII]. That wheel is scheduled to be replaced with a  7-filter wheel that has Sloan, plus others to be determined.
 
 
[[File:astrodon_sloan.jpg|600px|center]]
 
 
[[File:astrodon_cbb.jpg|600px|center]]
 


== Transformation from Sloan to UBVRI Filter Bands ==
== Transformation from Sloan to UBVRI Filter Bands ==
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Transformation coefficients are discussed on the Sloan Digital Sky Survey  
Transformation coefficients are discussed on the Sloan Digital Sky Survey  
[http://www.sdss.org/dr7/algorithms/sdssUBVRITransform.html Sloan Digital Sky Survey website]
[http://www.sdss.org/dr7/algorithms/sdssUBVRITransform.html Sloan Digital Sky Survey website]


== UBVRI Photometry ==
== UBVRI Photometry ==


There will be one UBVRI filter wheel at each observatory. The filters are currently on order.
There is one UBVRI filter wheel at each observatory to be used as needed an any telescope with an IFW3 filter wheel.


*(1) U (-390)
*(1) U (340-390)
*(2) B (375-490)
*(2) B (375-490)
*(3) V (490-580)  
*(3) V (490-580)  
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[[File:Ubvric_ad.jpg|400px|center]]
[[File:Ubvric_ad.jpg|400px|center]]
As of November 2011, a proposal to add this BVRIC set is under discussion.


== BGRC Color Imaging ==
== BGRC Color Imaging ==


There is one  color imaging set of filters at Moore Observatory.  A second set for Mt. Kent may be added.
There is one  color imaging wheel at each site.   


*(1) B (390-510)
*(1) C (350-1100)
*(2) G (490-575)
*(2) R (590-700)
*(3) R (590-700)
*(3) G (490-575)
*(4) C (350-1100)
*(4) B (390-510)
*(5) Open  
*(5) Open  
*(6) Open  
*(6) Open  


[[File:Lrgb_ad.jpg‎|400px|center]]
[[File:Lrgb_ad.jpg‎|400px|center]]


== Narrowband ==
== Narrowband ==


There are four narrowband imaging sets available.  The standard wheels at Mt. Kent for CDK20S and CDK700 are
There are three narrowband filter sets available.  The wheels at Mt. Kent for CDK20S and CDK700 use Astrodon filters:


*(1) [SII]
*(1) [SII] (3/671.6)
*(2) H alpha (656)
*(2) H alpha (3/656.3)
*(3) Red continuum
*(3) Red continuum (5/645)
*(4) Open
*(4) [O III] (3/500.7)
*(5) [O III]
*(5) UV blocked clear
*(6) Open
*(6) Open


A wheel primarily use at the CDK20N  is


*(1) [SII]
A wheel for the CDK20N  is
*(2) H alpha
 
*(3) Red continuum
*(1) He I (5/1083.0) (Custom Scientific)
*(4) He I (1083)
*(2) [SII] (3/671.6)
*(5) [O III]
*(3) H alpha (3/656.3)
*(6) Open
*(4) Red continuum (5/645)
*(5) [O III] (3/500.7)
*(6) UV blocked clear
 


A wheel for use at the RC24 is
A wheel for use at the RC24 is


*(1) [SII]
*(1) [SII] (Custom Scientific)
*(2) H alpha
*(2) H alpha (Custom Scientific)
*(3) Rec continuum
*(3) Red continuum (Astrodon)
*(4) Na D (590)
*(4) Na D (590) (Custom Scientific)
*(5) [OIII]
*(5) [OIII] (Custom Scientific)
*(6) UV blocked clear (Astrodon)
 


[[File:Sii_filter.jpg|400px|center]]
[[File:Sii_filter.jpg|400px|center]]
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== SBIG STL Filters ==
== SBIG STL Filters ==


The SBIG STL6303 cameras take 50 mm diameter filters in a 5-filter wheel.  Moore and Mt. Kent observatories have the standard UBVIC set installed in the STL cameras:
The SBIG STL6303 cameras take 50 mm diameter filters in a 5-filter wheel.  Moore and Mt. Kent observatories have the standard UBVRI set installed in the STL cameras used on the wide-field FSQ telescope for student projects:


*(1) U (330-390)
*(1) U (330-390)
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*(5) I (725-1025)
*(5) I (725-1025)


Additionally, at Mt. Kent there is a set of color imaging BGRC filters in a spare wheel.  STL cameras require disassembly to change wheels.
Additionally, at both locations there is a set of color imaging RGBC filters in spare wheels.  STL cameras require disassembly to change wheels.
 
The STL camera at Mt. Kent has been retired from Shared Skies and may be used on the APTA telescope there.  The STL camera at Moore Observatory is in use on the FSQ roll roof telescope.

Latest revision as of 08:21, 1 January 2018

A common system of filters is available for use with the CCD cameras at Moore, Mt. Kent and Mt. Lemmon observatories. With some exceptions, noted below, all filters are mounted in wheels that may be changed on request.



Sloan Photometry

There is a set of Sloan filters for each of the ULMT, MORC24, CDK20N, CDK20S, and CDK700 telescopes. Each set excepton ULMT is in a wheel with 6 openings assigned serially.


  • (1) g' (400-530)
  • (2) r' (530-700)
  • (3) i' (700-825)
  • (4) z' (825-1100)
  • (5) blue block (500-1100)
  • (6) Open

Currently the ULMT wheel has 10 openings including the Sloan filters, color imaging filters, H-alpha and [OIII]. That wheel is scheduled to be replaced with a 7-filter wheel that has Sloan, plus others to be determined.


Astrodon sloan.jpg


Astrodon cbb.jpg


Transformation from Sloan to UBVRI Filter Bands

Transformation coefficients are discussed on the Sloan Digital Sky Survey Sloan Digital Sky Survey website


UBVRI Photometry

There is one UBVRI filter wheel at each observatory to be used as needed an any telescope with an IFW3 filter wheel.

  • (1) U (340-390)
  • (2) B (375-490)
  • (3) V (490-580)
  • (4) R (570-690)
  • (5) I (725-1025)
  • (6) Open


Ubvric ad.jpg

BGRC Color Imaging

There is one color imaging wheel at each site.

  • (1) C (350-1100)
  • (2) R (590-700)
  • (3) G (490-575)
  • (4) B (390-510)
  • (5) Open
  • (6) Open
Lrgb ad.jpg


Narrowband

There are three narrowband filter sets available. The wheels at Mt. Kent for CDK20S and CDK700 use Astrodon filters:

  • (1) [SII] (3/671.6)
  • (2) H alpha (3/656.3)
  • (3) Red continuum (5/645)
  • (4) [O III] (3/500.7)
  • (5) UV blocked clear
  • (6) Open


A wheel for the CDK20N is

  • (1) He I (5/1083.0) (Custom Scientific)
  • (2) [SII] (3/671.6)
  • (3) H alpha (3/656.3)
  • (4) Red continuum (5/645)
  • (5) [O III] (3/500.7)
  • (6) UV blocked clear


A wheel for use at the RC24 is

  • (1) [SII] (Custom Scientific)
  • (2) H alpha (Custom Scientific)
  • (3) Red continuum (Astrodon)
  • (4) Na D (590) (Custom Scientific)
  • (5) [OIII] (Custom Scientific)
  • (6) UV blocked clear (Astrodon)


Sii filter.jpg
Halpha 5nm ad.jpg
Red continuum ad.jpg
Oiii filter cs.jpg

SBIG STL Filters

The SBIG STL6303 cameras take 50 mm diameter filters in a 5-filter wheel. Moore and Mt. Kent observatories have the standard UBVRI set installed in the STL cameras used on the wide-field FSQ telescope for student projects:

  • (1) U (330-390)
  • (2) B (375-490)
  • (3) V (490-580)
  • (4) R (570-690)
  • (5) I (725-1025)

Additionally, at both locations there is a set of color imaging RGBC filters in spare wheels. STL cameras require disassembly to change wheels.

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