ENR CTIO Blanco 4-m 2018-02-16

Date:

Friday, February 16, 2018

Telescope:

CTIO Blanco 4-m

Submitter:

Nathan Golovich

Submitter Email:

golovich1@llnl.gov

Observer Support:

Clara Martinez-Vazquez

Night Assistant:

Claudio Aguilera

Also Present:

William Dawson

Problems:

Humidity alarm occurred continuously with humidity ranging between 5 and 6%. Windows were closed but it failed to lower the humidity in the dome. This occurred after a weather front pushed through that brought some light clouds.

The browsers were all pretty slow all night, but especially when we were doing frequent short (<15 second) exposures. It seemed to slow down the observer console.

Comments:

Clouds brought bad seeing -- even after they left -- which got as bad as ~2.5" and stayed above ~1.5" for the rest of the night.

We had three hours of very good seeing and conditions before the clouds pushed through and greatly obscurred our target for about 45-60 minutes. We kept observing because we could see stars still, but the PSF and depth were greatly effected. The clouds went away for about two hours but the seeing stayed bad. Then the clouds returned (much thinner this time) for the final two hours of the night.

We observed our targets as planned despite the clouds. We expect about 10-20% of the night to be a loss though.

Conditions:

General Conditions

Comment:

None.

1st Quarter

Clouds:

Clear

Wind:

Low

Seeing Value:

1.20

Seeing Variability:

0.4

Seeing Source:

The Telescope I used

Sky :

2nd Quarter

Clouds:

Thin Clouds

Wind:

Low

Seeing Value:

1.30

Seeing Variability:

0.4

Seeing Source:

The Telescope I used

Sky:

3rd Quarter

Clouds:

Partially cloudy

Wind:

Low

Seeing Value:

1.75

Seeing Variability:

0.6

Seeing Source:

The Telescope I used

Sky:

4th Quarter

Clouds:

Thin Clouds

Seeing Value:

1.30

Seeing Variability:

0.4

Seeing Source:

The Telescope I used

Sky:

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Program:

Proposal:

2018A-0273

Target of Oportunity:

Time Observed:

9.5

Time Engineering:

0.0

Time lost technical:

0.0

Time lost weather:

2.0

Time lost other:

0.0

Description:

A photometric gravitation microlensing survey of the Bulge, LMC, and SMC in search of intermediate mass black holes.

Primary Investigator:

William Dawson

Email:

willdawson@llnl.gov [1]

Institution:

Lawrence Livermore National Lab

Instrument:

CTIO 4m DECam

Organization:

NOAO

Total Program Time:

11.5

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Total Times	Time Observed	Time Engineering	Time lost technical	Time lost weather	Time lost other	Total Program Time
2018-02-16	9.5	0.0	0.0	2.0	0.0	11.5