CRIRES User Manual
Doc. Number: ESO-254264
Doc. Version: P109.4
Issued on:
2021-12-01
Page:
64 of 99
Document Classification: ESO Internal Use [Confidential for Non-ESO Staff]
·
WFS Alpha/Delta sky offset (arcsec)
(TSF:
SEQ.NGS.SKYALPHA, SEQ.NGS.SKYDELTA
)
provide the offsets of the location relative to the NGS where MACAO measures the sky.
If
SEQ.NGS.SKYALPHA
> 0, the sky is measured to the East of the NGS.
If
SEQ.NGS.SKYDELTA
> 0, the sky is measured to the North of the NGS.
Default values are usually fine, except in crowded fields.
·
SV Guide Star = AO Guide Star
(TSF:
SEQ.NGS.ISSVGS
) is a flag that must be set to YES
if the AO NGS is also the SVGS, otherwise to NO. Note that this parameter is irrelevant
for differential tracking.
Pay attention to the following five possible combinations:
If
target = AO NGS = SVGS
(mandatory for polarimetry and spectro-astrometry!), then:
•
Target == AO Guide Star
must be set to
yes
•
SV Guide Star == AO Star
must be set to
yes
•
RA/DEC of AO guide star
must be left unchanged at 00:00:00.000.
•
RA/DEC offset between the target and SV guide star
must be left unchanged at
0.
If
target = AO NGS
¹
SVGS
, then:
•
Target == AO Guide Star
must be set to
yes
•
SV Guide Star == AO Star
must be set to
no
•
RA/DEC of AO guide star
must be left unchanged at 00:00:00.000.
•
RA/DEC offset between the target and SV guide star
must be provided (in
arcsec)
If
target = SVGS
¹
AO NGS
, then:
•
Target == AO Guide Star
must be set to
no
•
SV Guide Star == AO Star
must be set to
no
•
RA/DEC of AO guide star
must be set to the coordinates of the AO NGS.
•
RA/DEC offset between the target and SV guide star
must be left unchanged at
0.
If
AO NGS = SVGS
¹
target
, then:
•
Target == AO Guide Star
must be set to
no
•
SV Guide Star == AO Star
must be set to
yes
•
RA/DEC of AO guide star
must be set to the coordinates of the AO NGS.
•
RA/DEC offset between the target and SV guide star
must be left unchanged at
0.
If
target
¹
SVGS
¹
AO NGS
(all three stars are different), then:
•
Target == AO Guide Star
must be set to
no
•
SV Guide Star == AO Star
must be set to
no
•
RA/DEC of AO guide star
must be set to the coordinates of the AO NGS.
•
RA/DEC offset between the target and SV guide star
must be provided (in
arcsec)
