FixedPointingInfo¶

class gammapy.data.FixedPointingInfo(meta)[source]¶

Bases: object

IACT array pointing info.

Data format specification: POINTING

Parameters

metameta: Meta header info from Table on pointing

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>)
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

`altaz`	ALT/AZ pointing position computed from RA/DEC (`SkyCoord`).
`altaz_frame`	ALT / AZ frame (`AltAz`).
`duration`	Pointing duration (`TimeDelta`).
`location`	Observatory location (`EarthLocation`).
`obstime`	Average observation time for the observation (`Time`).
`radec`	RA/DEC pointing position from table (`SkyCoord`).
`time_ref`	Time reference (`Time`).
`time_start`	Start time (`Time`).
`time_stop`	Stop time (`Time`).

Methods Summary

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).

altaz_frame¶: ALT / AZ frame (AltAz).

duration¶

Pointing duration (TimeDelta).

The time difference between the TSTART and TSTOP.

location¶: Observatory location (EarthLocation).

obstime¶: Average observation time for the observation (Time).

radec¶: RA/DEC pointing position from table (SkyCoord).

time_ref¶: Time reference (Time).

time_start¶: Start time (Time).

time_stop¶: Stop time (Time).

Methods Documentation

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_infoPointingInfo: Pointing info object