FixedPointingInfo#
- class gammapy.data.FixedPointingInfo(meta)[source]#
Bases:
object
IACT array pointing info.
Data format specification: POINTING
- Parameters
- meta
meta
Meta header info from Table on pointing
- meta
Examples
>>> from gammapy.data import PointingInfo >>> path = '$GAMMAPY_DATA/tests/pointing_table.fits.gz' >>> pointing_info = PointingInfo.read(path) >>> print(pointing_info) Pointing info: Location: GeodeticLocation(lon=<Longitude 16.50022222 deg>, lat=<Latitude -23.27177778 deg>, height=<Quantity 1835. m>) # noqa: E501 MJDREFI, MJDREFF, TIMESYS = (51910, 0.000742870370370241, 'TT') Time ref: 2001-01-01T00:01:04.184 Time ref: 51910.00074287037 MJD (TT) Duration: 1586.0000000000018 sec = 0.44055555555555603 hours Table length: 100 START: Time: 2004-01-21T19:50:02.184 Time: 53025.826414166666 MJD (TT) RADEC: 83.6333 24.5144 deg ALTAZ: 11.4575 41.3409 deg END: Time: 2004-01-21T20:16:28.184 Time: 53025.844770648146 MJD (TT) RADEC: 83.6333 24.5144 deg ALTAZ: 3.44573 42.1319 deg
Note: In order to reproduce the example you need the tests datasets folder. You may download it with the command
gammapy download datasets --tests --out $GAMMAPY_DATA
Attributes Summary
ALT/AZ pointing position computed from RA/DEC (
SkyCoord
) for the midpoint of the run.ALT / AZ frame (
AltAz
).Pointing duration (
TimeDelta
).The fixed coordinates in AltAz of the observation.
The fixed coordinates in ICRS of the observation.
Observatory location (
EarthLocation
).See
PointingMode
, if not present, assume POINTINGAverage observation time for the observation (
Time
).RA/DEC pointing position from table (
SkyCoord
).Time reference (
Time
).Start time (
Time
).Stop time (
Time
).Methods Summary
get_altaz
(obstime)Get the pointing position in AltAz frame for a given time.
get_icrs
(obstime)Get the pointing position in ICRS frame for a given time.
read
(filename[, hdu])Read pointing information table from file to obtain the metadata.
Attributes Documentation
- altaz#
ALT/AZ pointing position computed from RA/DEC (
SkyCoord
) for the midpoint of the run.Use
get_altaz
to get the pointing at a specific time, correctly handling different pointing modes.
- fixed_altaz#
The fixed coordinates in AltAz of the observation.
None if not a DRIFT observation
- fixed_icrs#
The fixed coordinates in ICRS of the observation.
None if not a POINTING observation
- location#
Observatory location (
EarthLocation
).
- mode#
See
PointingMode
, if not present, assume POINTING
- radec#
RA/DEC pointing position from table (
SkyCoord
).Use
get_icrs
to get the pointing at a specific time, correctly handling different pointing modes.
Methods Documentation
- get_altaz(obstime)[source]#
Get the pointing position in AltAz frame for a given time.
If the observation was performed tracking a fixed position in ICRS, the icrs pointing is transformed at the given time using the location of the observation.
If the observation was performed in drift mode, the fixed altaz coordinate is returned with
obstime
attached.- Parameters
- obstime: `astropy.time.Time`
Time for which to get the pointing position in AltAz frame
- get_icrs(obstime)[source]#
Get the pointing position in ICRS frame for a given time.
If the observation was performed tracking a fixed position in ICRS, the icrs pointing is returned with the given obstime attached.
If the observation was performed in drift mode, the fixed altaz coordinates are transformed to ICRS using the observation location and the given time.
- Parameters
- obstime: `astropy.time.Time`
Time for which to get the pointing position in ICRS frame
- classmethod read(filename, hdu='EVENTS')[source]#
Read pointing information table from file to obtain the metadata.
- Parameters
- filenamestr
File name
- hduint or str
HDU number or name
- Returns
- pointing_info
PointingInfo
Pointing info object
- pointing_info