---

Observing notes - March 2004 2SLAQ run

---

Observers: OUTRAM, ROSS, CROOM, SHARP, CANNON

Nightly updates

19/03-20/03 log

First night of March run. Clear weather. A few technical problems configuring 4th field (which was then not observed due to time lost) Halation on CCD2 (b04/c05), some scattered light on CCD1 on field c05 due to back illumination whilst configuring the other plate.

20/03-21/03 log

Clear weather, good seeing. CCDs pumped during the day - delayed start after waiting for CCDs to cool before focussing. A few technical problems configuring cost 1 hour.

21/03-22/03 log

useless

22/09-23/09 log

briefly observed in poor conditions. Most of the night lost to poor weather

23/09-24/09 log

Cloud at start of night, cleared about 11pm. Lost half an hour after CCD crashed reading out.

24/03-25/03 log

Clear weather. No major technical problems.

Observing summary

The following summary gives the civil date of observation, field name, exposure time, nominal numbers of galaxies in the field, the numbers of galaxies for which redshifts were measured (Q=3,4,5 on the new system), the redshift yield, and notes on the conditions.

Date   Field  Exposure      Seeing  Comments

040319 a17_v1 4x1800s       1.5"    
040319 b04_v1 4x1800s       1.5"    halation (CCD2)
040319 c05_v1 5x1800s+900s  1.5"    halation (CCD2), scattered light (CCD1)

040320 a17_v2 4x1800s       1.0" 
040320 b04_v2 4x1800s       1.0"
040320 c05_v2 4x1800s       1.0"
040320 d06_v1 2x1500s       1.0"    

040322 c07_v1 1x1800s       2.5"    poor conditions

040323 b06_v1 2x1800s       1.6"
040323 c07_v1 4x1800s       1.6"
040323 d06_v2 3x1800s       2.0"

040324 b06_v2 6x1800s       1.5"
040324 c07_v2 4x1800s       1.5"
040324 d06_v2 6x1800s       1.5"

Run summary

Of the 6 nights we had 3.5 effective clear nights (58%). We obtained complete (4 hrs+) observations of 6 fields.