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  1. Request For Comments
  2. RFC-702

Adapt DMSR to reflect LCR-1459 and state that fluxes are reported in nanojanskys

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    Details

    • Type: RFC
    • Status: Implemented
    • Resolution: Done
    • Component/s: DM
    • Labels:

      Description

      DMS-REQ-0043 says, in the normative text:

      Specification: The DMS shall provide calibrated photometry in each observed passband for all measured entities (e.g., DIASources, Sources, Objects), measuring the AB magnitude of the equivalent flat-SED source, above the atmosphere. Fluxes, possibly in jansky, shall be calculated for all measured entities. [emphasis mine]

      This text should have been corrected as part of LCR-1459, "Update Data Products Definition Document LSE-163", which included the adoption of a PST recommendation ( Document-27758 ) to report fluxes in nanojanskys.

      It is proposed to change the normative text of DMS-REQ-0043 to the following:

      Specification: The DMS shall provide calibrated photometry in each observed passband for all measured entities (e.g., DIASources, Sources, Objects), measuring the AB magnitude of the equivalent flat-SED source, above the atmosphere. Fluxes shall be calculated for all measured entities, and shall be reported in nanojanskys.

      and to append the following sentence to the "Discussion" section:

      The rationale for the use of nanojanskys is presented in Document-27758.

      Following approval of this RFC, an LCR will be required to actually change the DMSR.

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            Hide
            tjenness Tim Jenness added a comment -

            This looks good to me. I'm happy to fast track this RFC and discuss it at tomorrow's DMCCB meeting.

            Show
            tjenness Tim Jenness added a comment - This looks good to me. I'm happy to fast track this RFC and discuss it at tomorrow's DMCCB meeting.
            Hide
            lguy Leanne Guy added a comment -

            I support this RFC

            Show
            lguy Leanne Guy added a comment - I support this RFC
            Hide
            Parejkoj John Parejko added a comment -

            +1

            As someone involved in the original jansky/maggie/nanojansky discussion, I wholehearted approve of this RFC.

            Show
            Parejkoj John Parejko added a comment - +1 As someone involved in the original jansky/maggie/nanojansky discussion, I wholehearted approve of this RFC.
            Hide
            gpdf Gregory Dubois-Felsmann added a comment - - edited

            In the course of researching another RFC, I came across DMS-REQ-0347, "Measurements in catalogs", in the "General Considerations" for "Data Products" section (1.1) of the DMSR:

            All catalogs shall record source measurements in flux units.

            Requirement DMS-REQ-0043, by contrast, appears in the "Applications Software" section.

            It seems more appropriate to constrain the units in a requirements section related to the presentation of data products, so on reflection I would like to revise my proposal as follows:

            • The normative text of DMS-REQ-0043 should end with the sentence "Fluxes shall be calculated for all measured entities." with no change to the existing Discussion.
            • DMS-REQ-0347 should be changed to state "All catalogs shall record source measurements with fluxes, reported in nanojanskys." with "The rationale for the use of nanojanskys is presented in Document-27758." appended to the Discussion.
            Show
            gpdf Gregory Dubois-Felsmann added a comment - - edited In the course of researching another RFC, I came across DMS-REQ-0347, "Measurements in catalogs", in the "General Considerations" for "Data Products" section (1.1) of the DMSR: All catalogs shall record source measurements in flux units. Requirement DMS-REQ-0043, by contrast, appears in the "Applications Software" section. It seems more appropriate to constrain the units in a requirements section related to the presentation of data products, so on reflection I would like to revise my proposal as follows: The normative text of DMS-REQ-0043 should end with the sentence "Fluxes shall be calculated for all measured entities." with no change to the existing Discussion. DMS-REQ-0347 should be changed to state "All catalogs shall record source measurements with fluxes, reported in nanojanskys." with "The rationale for the use of nanojanskys is presented in Document-27758." appended to the Discussion.
            Hide
            gpdf Gregory Dubois-Felsmann added a comment -

            Moved to "Adopted"; DM-25716 for implementation (in this case, filing an LCR).

            Show
            gpdf Gregory Dubois-Felsmann added a comment - Moved to "Adopted"; DM-25716 for implementation (in this case, filing an LCR).
            Hide
            gpdf Gregory Dubois-Felsmann added a comment -

            LCR-2378, "Correct LSE-61 Flux Units Definition to Nanojanskys", submitted.

            Show
            gpdf Gregory Dubois-Felsmann added a comment - LCR-2378 , "Correct LSE-61 Flux Units Definition to Nanojanskys", submitted.
            Hide
            tjenness Tim Jenness added a comment -

            I think this LCR has been fully implemented and this RFC can also be marked implemented.

            Show
            tjenness Tim Jenness added a comment - I think this LCR has been fully implemented and this RFC can also be marked implemented.
            Hide
            lguy Leanne Guy added a comment -

            It has, yes

            Show
            lguy Leanne Guy added a comment - It has, yes

              People

              Assignee:
              gpdf Gregory Dubois-Felsmann
              Reporter:
              gpdf Gregory Dubois-Felsmann
              Watchers:
              Colin Slater, Gabriele Comoretto [X] (Inactive), Gregory Dubois-Felsmann, John Parejko, John Swinbank, Kian-Tat Lim, Leanne Guy, Michelle Butler [X] (Inactive), Tim Jenness, Wil O'Mullane
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                Updated:
                Resolved:
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