Wednesday, April 13, 2011

Amazing seeing when we least expected it!

The seasons are changing up here...  Not only are the leaves turning, the telescope's developing a whole new attitude as well!


Unfortunately, huge thunderclouds threatened at sunset & the night looked sure to be a write-off.


Amazingly though, the clouds dumped their rain & the sky completely cleared up around midnight so SALT was opened up & the primary mirror aligned. 


The humidity remained above 80% but (against all odds!), the DIMM consistently measured sub-arcsecond seeing - the best reading we saw was 0.66"! :)  A full frame RSS image was quickly taken to check the position of the RSS guide probe.


The probe was found to be well represented by the blue graphic, seen here on the SALTICAM frame.  But the sky was so good, Janus kindy declined doing further guiding tests in favour of getting some pretty pictures!


The average FWHM of ~150 stars all over the RSS field was 0.98" for an open cluster (NGC 4052) that we looked at.


Duty SALT Astronomer Paul had his hands full scrambling to get images on both instruments through multiple filters before the dew-point & humidity limits shut us down for the rest of the night.


Great stuff though - uniform, sub-arcsec FWHM over the full field of view :)


The SALTICAM images were run through the IQ pipeline & yielded the following impressive results!   These plots are for the I-band data.
Thanks to Janus for the 4 control room photos - I'd left my camera down in my room as I came up to the telescope when there seemed no chance at all of going on-sky!

Tuesday, April 12, 2011

RSS 2nd Light Image

On the night of April 9 we took the first images with the freshly refurbished and reinstalled RSS spectrograph. The images are of the globular cluster Omega Centauri and were taken in two passbands at 629 nm and 434 nm. The images were combined to remove the gaps between the CCDs and then processed into a single colour image shown below. Enjoy!


Nightlog 2011-04-11

SA: Paul
SO: Patrick
Others: Janus, Anthony

----------------------------------------------------------------------
Summary
----------------------------------------------------------------------

- Totally clouded out tonight.

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

Monday, April 11, 2011

Nightlog 2011-04-10

SA: Paul
SO: Patrick
Others: Ken, Charl

----------------------------------------------------------------------
Summary
----------------------------------------------------------------------


- We weren't opened for long tonight, a huge front came in from the NW, closed
just before 22:00.

- We had bad dome seeing due to the low wind speed and open igloos.

- Attempted to check how the alignment of images on SALTICAM differs to the RSS,
but the RSS filter mechanism got stuck. This meant no RSS observations for the
evening.

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

Sunday, April 10, 2011

Nightlog 2011-04-09

SA: Paul
SO: Patrick
Others: Janus, Ken, Charl

----------------------------------------------------------------------
Summary
----------------------------------------------------------------------


*** 0.97-1.1 arcsec seeing images obtained with SALTICAM!

*** First RSS imaging after the re-installation!

- SALTICAM was ready to roll after its brief time in the workshop for repairs.
The stuck guide probe was tested and seems to work fine.

- The seeing improved and stayed below 1'' for a large portion of the night.
There was some problems with obtaining a good focus, which was due to a change
in the auto collimator offsets. New offsets were determined which produced
much better results.

- Had some tracker trouble but it was a successful night nonetheless.


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

Thursday, April 7, 2011

RSS goes UP!!!

Huge & Very successful day at SALT - RSS went back up today, absolutely perfectly done! :)  Knowing that everyone's keen to see all the action, I'm just posting the photos for now & will add captions & narrative as time permits...  Thanks to Anthony for some extra pictures taken with his beefy flash!

Late yesterday, RSS was powered down & taken off its life-support, in preparation for today's lift...  All dressed up & ready to go!


Some serious business had to be taken care of before the games could begin - here's Ken presenting Peter with a much-deserved award for his heroic efforts in getting RSS back together again.


Having shed so much blood for this instrument, a Purple Heart would've been in order - but this was the best that could be arranged on fairly short notice...

Our gentlemen of the spectrograph - Ken sporting his RSS PI hat, kindly donated last night by "the hired help" at Perlman's.


After a minor hold-up, during which the 4th chain block was hunted down, the riggers could get on with their part of the show.


Once securely attached to the lifting assembly, the whole lot was cranked over to 37 degrees.


Plenty of advice was freely available throughout the process, here we see some input from stage left.


Lift-off was painless this time - not a single crowbar was required!


Thanks to Zulu for adding a touch of class to the proceedings, delivering left-overs from the Thursday morning hostel tea...


Soon we got a good look at the underside of the beast.


The slightly anxious instrument PI was in a good position to watch it disappear up through the hatch.


The spectrograph herders took over on the first floor, guiding it up safely.


The etalon cables rode up on top of the rest.


Thanks Ant for this slightly more arty angle on things!


All hands on deck & all eyes on the creature rising from below...


Nerve-wracking stuff as Jono slowly hoisted it up on the dome crane.


Looking sinister...


The welcoming committee was on hand to greet the new arrival when it reached the catwalk.


Very impressive flash work there Ant, from all the way down on the first floor!


Charl keeping an eye while Hitesh rotated the structure into position underneath the spectrograph.


Then the fine adjustments were made by moving the tracker into place.


Ready to be deposited on the tracker!


The gang of 5 was in position to make sure that nothing got crunched as RSS was lowered into place.


The peanut gallery looked on anxiously from the catwalk below.


It was all rather too much excitement for our poor over-worked SALT Astronomer of the week...


Here's the view from across the dome.


Not the most ergonomic environment ever, but the team's perfectly at home up there.


With the spectrograph securely attached, the whole contraption could be released from the dome crane. 


& some deep sighs of relief could be exhaled - excellent job guys! :)


All smiles on their way down for a late lunch!


No much later, Peter was back in action on top of his spectrograph - getting everything connected up...


Down on the catwalk, Charl, Ockert & Jonathan worked on feeding all the wires through the cable wrap.


The new-look top end of the telescope :)


Down on the pier, the Cryotiger was connected up inside Igloo 8 - without the accidental release of noxious PT-30 gas this time!


Meanwhile, the spectrometer room suddenly looks a whole lot more spacious - not for too much longer though as the HRS is due to be delivered towards the end of the year.


The CCAS tower's now the perfect vantage point from which to photograph the RSS!  Here's Charl & Peter working their magic to get everything going up there.


Down in the control room, Ken was looking remarkably relaxed considering what a stressful day it'd been.  The smiles grew steadily as more & more mechanisms were tested & confirmed to still be functional.


A celebratory braai in the Rec Centre followed & included champers & a speech from Chris (accompanied by his better half, indicated by the arrow on the wall!).


This turned into one of the larger crowds for such an event, once the die-hard tech ops crew finally managed to drag themselves away from RSS & the rest got out of the 2 hour BEC meeting ...


Much later, the natives grew restless & the thought of depositing some of Ockert's sodium stash in the dam became incredibly appealing :}


A number of innocent margarine tubs were sacrificed for the cause, but the resulting explosions more than justified their flaming departures!


We predict saturated sodium lines in the 1.9-m's spectra tonight ;)


It was windy, cold & late, but these people know how to play almost as hard as they work!


Wow - a day to remember :)