meta/photometry-1.0.0
Photometry Information
Outline
Schema Definitions ¶
This type is an object with the following properties:
conversion_megajanskys
object Required Zeropoint Flux (MJy/sr)
The flux density (in units of megaJanskys per steradian; MJy/sr) that produces an instrumental count rate of 1 data number (DN) per second. A unit change to microJanskys per square arcsecond (uJy/arcsec^2) can be made by multiplying this value by the ratio (1 x 10^12 MJy/uJy) / (4.254517 x 10^10 arcsec^2/sr) = 23.50443054.
This node must validate against any of the following:
number
null
conversion_megajanskys_uncertainty
object Required Zeropoint Flux Uncertainty (MJy/sr)
The uncertainty in the flux density (in units of megaJanskys per steradian; MJy/sr) that produces an instrumental count rate of 1 data number (DN) per second. A unit change to microJanskys per square arcsecond (uJy/arcsec^2) can be made by multiplying this value by the ratio (1 x 10^12 MJy/uJy) / (4.254517 x 10^10 arcsec^2/sr) = 23.50443.
This node must validate against any of the following:
number
null
pixel_area
object Required Nominal Pixel Area (sr)
The average pixel area in units of steradians. This may be converted to units of square arcseconds by multiplying the value by 4.254517 x 10^10 square arcseconds per steradian.
This node must validate against any of the following:
number
null
Original Schema ¶
%YAML 1.1
---
$schema: asdf://stsci.edu/datamodels/roman/schemas/rad_schema-1.0.0
id: asdf://stsci.edu/datamodels/roman/schemas/meta/photometry-1.0.0
title: Photometry Information
type: object
properties:
conversion_megajanskys:
title: Zeropoint Flux (MJy/sr)
description: |
The flux density (in units of megaJanskys per
steradian; MJy/sr) that produces an instrumental count rate of 1
data number (DN) per second. A unit change to microJanskys per
square arcsecond (uJy/arcsec^2) can be made by multiplying this
value by the ratio (1 x 10^12 MJy/uJy) / (4.254517 x 10^10
arcsec^2/sr) = 23.50443054.
anyOf:
- type: number
- type: "null"
unit: "MJy.sr**-1"
archive_catalog:
datatype: float
destination:
[
WFIExposure.conversion_megajanskys,
SourceCatalog.conversion_megajanskys,
]
conversion_megajanskys_uncertainty:
title: Zeropoint Flux Uncertainty (MJy/sr)
description: |
The uncertainty in the flux density (in units of
megaJanskys per steradian; MJy/sr) that produces an instrumental
count rate of 1 data number (DN) per second. A unit change to
microJanskys per square arcsecond (uJy/arcsec^2) can be made by
multiplying this value by the ratio (1 x 10^12 MJy/uJy) /
(4.254517 x 10^10 arcsec^2/sr) = 23.50443.
anyOf:
- type: number
- type: "null"
unit: "MJy.sr**-1"
archive_catalog:
datatype: float
destination:
[
WFIExposure.conversion_megajanskys_uncertainty,
SourceCatalog.conversion_megajanskys_uncertainty,
]
pixel_area:
title: Nominal Pixel Area (sr)
description: |
The average pixel area in units of steradians. This
may be converted to units of square arcseconds by multiplying
the value by 4.254517 x 10^10 square arcseconds per steradian.
anyOf:
- type: number
- type: "null"
unit: "uJy.arcsec**-2"
archive_catalog:
datatype: float
destination: [WFIExposure.pixel_area, SourceCatalog.pixel_area]
required:
[conversion_megajanskys, conversion_megajanskys_uncertainty, pixel_area]