SofiaAstrometryInfo¶

class sofia_redux.scan.custom.sofia.info.astrometry.SofiaAstrometryInfo[source]¶

Bases: AstrometryInfo

Initialize astrometry information for SOFIA observations.

The SOFIA astrometry information should be relevant to all instruments that may be mounted on SOFIA. All equatorial observations use the J2000 equinox. Additionally, SOFIA is considered a ground-based telescope since it still encounters atmospheric effects.

Attributes Summary

default_fits_date

Methods Summary

`apply_configuration`()	Update astrometry information with the FITS header configuration data.
`coordinate_valid`(coordinate)	Check whether a coordinate is valid.
`guess_reference_coordinates`([header, telescope])	Guess the reference coordinates of a scan.
`is_requested_valid`([header])	Check whether the requested OBSRA/DEC values in the header are valid.
`parse_astrometry`()	Parse and apply coordinate related keywords from the FITS header.
`parse_time`()	Parse and apply time related keywords from the FITS header.
`validate_astrometry`(scan)	Validate astrometry information from a scan.

Attributes Documentation

default_fits_date = '1970-01-01T00:00:00.0'¶

Methods Documentation

apply_configuration()[source]¶

Update astrometry information with the FITS header configuration data.

Returns:

None

classmethod coordinate_valid(coordinate)[source]¶

Check whether a coordinate is valid.

Parameters:

coordinateCoordinate2D

Returns:

validbool

guess_reference_coordinates(header=None, telescope=None)[source]¶

Guess the reference coordinates of a scan.

Parameters:

headerastropy.io.fits.Header, optional: The header to read. The default is to read stored OBSRA/OBSDEC values in the configuration.
telescopeSofiaTelescopeInfo, optional: A telescope object to extract the boresight equatorial coordinates if all other avenues to the coordinates failed.

Returns:

coordinatesEquatorialCoordinates

is_requested_valid(header=None)[source]¶

Check whether the requested OBSRA/DEC values in the header are valid.

Parameters:

headerastropy.io.fits.header.Header, optional: The header to read. If not supplied, the FITS header for the scan will be read instead.

Returns:

validbool

parse_astrometry()[source]¶

Parse and apply coordinate related keywords from the FITS header.

The following FITS header keywords are used:

KEY       DESCRIPTION
--------  -----------
EQUINOX   The equinox of the observation (year)
OBSRA     The right-ascension of the observed source (hours)
OBSDEC    The declination of the observed source (degrees)

The modified Julian date (MJD) is calculated, and precessions are initialized relative to the J2000 equinox.

Returns:

None

parse_time()[source]¶

Parse and apply time related keywords from the FITS header.

The following FITS header keywords are used:

KEY       DESCRIPTION
--------  -----------
DATE      Determines the file date (ISOT format, UTC scale)
DATE-OBS  The exposure start time (ISOT format, UTC scale)
UTCSTART  The UTC of the exposure start (hh:mm:ss.### UTC format)
UTCEND    The UTC of the exposure end (hh:mm:ss.### UTC format)

The modified Julian date (MJD) is calculated, and precessions are initialized relative to the J2000 equinox.

Returns:

None

validate_astrometry(scan)[source]¶

Validate astrometry information from a scan.

Returns:

None

Navigation

SofiaAstrometryInfo¶