RA Range: 10.7 h

Constraint set (Typical seeing, Transparency,Airmass, FLI, Moon distance): 1.0, THN, 1.5, 1.0, 30

Pre-imaging run?	No!	Chilean run?	No!	Special calibrations?	No!
Time critical?	Yes!	ToO?	No!	Carry-over run?	No!

 
 
 Program devoted to follow Eta Carinae from October to March, observing both 
the star (twice, once in Oct and once in Feb) and the special region (FOS4) 
within the nebula, that shows the reflected stellar spectrum. An offset star 
is used to place the slit on the FOS4 region. Note that also a guide star 
(and its FC) is provided. 

Requirements: brief summary (cf README for full info)-
1. because variability is expected on short timescales, it is important that 
the full spectrum (i.e. 2 OBs using Dic1 and Dic2) is taken within the same 
night, better one after each other. 

2. observations consist of a pair OBs ( 1 Dic1 + 1 Dic2) that need to be 
executed at 1 month intervals (+/- 5 days) from Oct to Mar! In Oct and Feb 
also the star Eta Car must be observed (with the same setup), close in time 
to the pair of OBs on the region FOS4. 

3. February observations are the most critical: execution of first set of 
OBs (4 in total, 2 on the star and 2 on FOS4) need to be coordinated with 
HST observations (final date not yet available). 2nd pair of OBs (for Feb) 
must be executed 2 weeks after (plus/minus 1 day). This is the travel 
delay time calculated from the change in the stellar spectrum to arrive at 
the FOS4 position, were the reflected spectrum is measured.

4. revised strategy: please keep executing all OBs, even those for 'October' 
or 'November' - they will still be useful to the PI (18.12.02). Cf USG-6557 
and/or USG-6552 for more details)

NEWS (13.02.03): final strategy for February observations 

1) On February 13 (if possible), or as close as possible to this date:

Eta Car STAR  Feburary-1  (Dic1)   
Eta Car STAR  February-2  (Dic2)   
Eta Car FOS4  Feburary-1  (Dic1)
Eta Car FOS4  Feburary-2  (Dic2)

These need to be executed during the same night. Timing is important, 
since HST observations have been scheduled for Feb 13. So, constraints 
have lower priority wrt getting the observations as close as possible to 
tonight. 


2) Two weeks after (which based on our SM schedule means from Mar 6 on): 

Eta Car FOS4  Feburary-3  (Dic1)
Eta Car FOS4  Feburary-4  (Dic2)

Again, they need to be executed on the same night. For this set of 
observations, PI has suggested to try to get them within constraints ... 
override constraints only towards the end of the SM window (Mar 6-13), 
if needed. 

 

Run status page 70.D-0607A

README of this run:

70.D-0607A.README