PointingInfo¶

class gammapy.data.PointingInfo(table)[source]¶

Bases: object

IACT array pointing info.

Data format specification: POINTING

Parameters

tableTable: Table (with meta header info) on pointing

Examples

>>> from gammapy.data import PointingInfo
>>> pointing_info = PointingInfo.read('$GAMMAPY_DATA/tests/pointing_table.fits.gz')
>>> 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 position computed from RA / DEC (`SkyCoord`).
`altaz_frame`	ALT / AZ frame (`AltAz`).
`altaz_from_table`	ALT / AZ position from table (`SkyCoord`).
`duration`	Pointing table duration (`TimeDelta`).
`location`	Observatory location (`EarthLocation`).
`radec`	RA / DEC position from table (`SkyCoord`).
`time`	Time array (`Time`).
`time_ref`	Time reference (`Time`).

Methods Summary

`altaz_interpolate`(time)	Interpolate pointing for a given time.
`read`(filename[, hdu])	Read `PointingInfo` table from file.

Attributes Documentation

altaz¶: ALT / AZ position computed from RA / DEC (SkyCoord).

altaz_frame¶: ALT / AZ frame (AltAz).

altaz_from_table¶: ALT / AZ position from table (SkyCoord).

duration¶

Pointing table duration (TimeDelta).

The time difference between the first and last entry.

location¶: Observatory location (EarthLocation).

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

time¶: Time array (Time).

time_ref¶: Time reference (Time).

Methods Documentation

altaz_interpolate(time)[source]¶: Interpolate pointing for a given time.

classmethod read(filename, hdu='POINTING')[source]¶

Read PointingInfo table from file.

Parameters

filenamestr: File name
hduint or str: HDU number or name

Returns

pointing_infoPointingInfo: Pointing info object