YALO Telescope Observer's Report for 2000 Sep 28

Observer: Jose Afonso
Observed all night from 23h43 to 9h47 UTC.
Conditions were Photometric most of the night.
Problems were encountered, see the summary for details.

Seeing and Weather:
   Beg: Seeing 1.6 arcsec, Clear, Winds Calm
   Mid: Seeing 1.8 arcsec, Clear, Winds Calm
   End: Seeing 1.6 arcsec, Clear, Winds Calm, ocasional gusts

Observing Summary:

Hello all.
Tonight, the observing program was almost completed:
-Object 2mass0559 was not observed due to the final of the night;
-Object sdss0539 was partially observed due to the final of the night (2 of the 3 proposed optical images, the last one already 
affected by the increase of brightness of the sky, 4 of the 5 IR images pretended). The observation of this object would have 
been completed but there was a guiding problem - wind - that forced me to abort the observation, raise the wind screen, and restart 
the observation again.

The weather was very good tonight, clear and calm, except for the wind gusts at the end of the night and at ocasions during the night.
I believe that the wind was not that strong, but the telescope was probably pointing in some more sensitive direction - anyway, it 
improved with the use of the wind screen.

Some notes on the objects observed:
- Object OB2K030 fell near the bad CCD column, hope it doesn't affect very much;
- For Nereid, I failed to observe at the right position. There is an offset from the initial pointing to Neptune which I failed to respect 
(I thought the shift was for the second position, to observe when the conditions are photometric). When taking the data I realized that there 
was an error on the initial pointing, but choose not to repeat the whole observation. I can see 2 options for this shift: either making Neptune 
fall outside of the good CCD area, since it will be saturated and will produce a residual, or to get Nereid inside the CCD. I don't believe this 
option due to the distances it would imply, so I choose to keep the initial observation directly pointing at Neptune, do several junk images to 
clear the ghost images, and then take the second image, to be done when the conditions are photometric, at the position specified. Hope it was 
the right choice.
- Objects NGC34 and NGC838 were observed without guiding, due to the inexistence of a suitable star nearby. These are short integration exposures, 
so it shouldn't matter very much.

- Magnitudes for Aql-X1: beginning of the night: 1.84 (R-band), 0.84 (V-band)
  	 		       around LST 23h30: 1.79 (R-band)

Cheers
Jose Afonso

------------------------------

Submitted by Jose Afonso on 2000 Sep 29 [9:00:40]