fixplanets – Changes FIELD and SOURCE table entries based on user-provided direction or POINTING table, optionally fixes the UVW coordinates – editing, maninpulation, calibration task
Description
This task’s main purpose is to correct observations which were performed with correct pointing and correlation but for which incorrect direction information was entered in the FIELD and SOURCE table of the MS. If you actually want to change the phase center of the visibilties in an MS, you should use task fixvis.
Input Parameters vis – Name of the input visibility set
field – field selection string
fixuvw – recalc uvw coordinates? (default: False)
- direction – if set, don’t use pointing table but set direction to this value.
The direction can either be given explicitly or as the path to a JPL Horizons ephemeris (for an example of the format, see directory data/ephemerides/JPL-Horizons/). Alternatively, the ephemeris table can also be provided as mime format file, i.e. a saved email as obtained via the commands (for example): import recipes.ephemerides.request as jplreq jplreq.request_from_JPL(objnam=’Mars’,startdate=’2012-01-01’,enddate=’2013-12-31’,
date_incr=’0.1 d’, get_axis_orientation=False, get_axis_ang_orientation=True, get_sub_long=True, use_apparent=False, get_sep=False, return_address=’YOUR_EMAIL_ADDESS’, mailserver=’YOUR_MAIL_SERVER_ADDRESS’)
- Note: some mail clients may not save the JPL mail properly.
Confirmed to work is Thunderbird.
default= ‘’ (use pointing table)
example: ‘J2000 19h30m00 -40d00m00’
- refant – if using pointing table information, use it from this antenna
default: 0 (antenna id 0) examples: ‘DV06’ (antenna with name DV06)
3 (antenna id 3)
- reftime – if using pointing table information, use it from this timestamp
default: ‘first’ examples: ‘median’ will use the median timestamp for the given field
using only the unflagged maintable rows ‘2012/07/11/08:41:32’ will use the given timestamp (must be within the observaton time)
Parameters
Parameter |
Default |
Description |
|---|---|---|
vis |
|
|
field |
|
|
fixuvw |
|
|
direction |
|
|
refant |
|
|
reftime |
|
Parameter Explanations
vis
''
Name of the input visibility set.
field
[ ]
Fields to operate on. Blank = all.
fixuvw
False
Recalculate Fourier-plane u,v,w coordinates
direction
''
if set, do not use pointing table but set direction to this value
refant
[ ]
if using pointing table information, use it from this antenna
reftime
'first'
if using pointing table information, use it from this timestamp