Tonight I saved over 73000 images on one target. That wore me out.
We had a good night – seeing was fairly good all night and we did some good engineering work in the first half. Clio’s prism spectrograph was aligned and focused, and we did some more photometric standard measurements with VisAO. Later we tried out some disk imaging with our wollaston and SDI filters. This required moving the rotator to various angles, which caused all kinds of excitement, including dumping the liquid nitrogen out of Clio’s dewar. That’s ok – the inner dewar stays solid and can last all night – but you have to be careful on the platform when it happens.
Later we did a long observations on a bright star, simultaneously at i’ (0.77 microns) and M’ (4.7 microns). Kind of cool to be doing science at such different wavelengths at the same time.
On the way down we had a close encounter with Vizzy.
We saw vizzy drinking out of a sprinkler hose, and then she hopped up the hill to watch us go by.Tonights sunset was leaning towards green until the last minute.
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“There’s nothing left to dump out of Clio now. I’m coming back in.” — Laird
Under certain conditions, such as high winds or observing faint stars, it is advantageous to use the shortest exposure times (~20 msec) of the VisAO camera and perform Lucky imaging. This technique is based on first selecting only the best images in a sequence of short exposures, and then shifting-and-adding (SAA) the results. This process can be computationaly intensive. As such, we have implemented a pipeline for the VisAO camera which is based on Google’s Youtube service. First a sequence of frames is uploaded to YouTube. If SAA can be beneficial, YouTube will offer to fix it, stating that the video is “shaky”. Here we present a comparative analysis of this pipeline.
Before:
After:
As you can see, significant improvement is achieved!
Future work:
The next phase of implementing this data reduction pipeline will include direct framegrabber-to-Google uploading, preventing any need for local storage. This will be helpful in limiting the need for MagAO project personnel to cause so many problems at LCO.
I hope it was happy, and we’re glad you’re here man.
As you can see in the above picture, we have a new minimum-force basis set to try (thanks Fernando!). As soon as we get everything lined up, we’ll test it on the CRO.
Speaking of the CRO, yesterday was crazy. So crazy that none of us had much energy left (at 1am) to write a long ‘splainy blog post. So here’s a little more about what was going on. The CRO is a tiny mirror inside a cup, which has a pinhole on the top. The CRO is suspended at the focus of the ASM, and we send light from an artifical star inside the W-unit up to the secondary, which focuses it into the pinhole, and the CRO reflects it back to the secondary exactly as it came in. CRO stands for Calibration Return Optic (note: it is NOT a retro-reflector! (right Alan?)), both C-R-O and Crow are considered correct pronunciations.
The CRO pinhole is very small, so we have to have it exactly on the optical axis of the telescope. To align it, we use two crosses, one at the W-unit itself, and one on the back of the CRO. The real magic, thanks to Armando and company, is to use a digital camera with a wide focus range to first focus on the W-unit cross, then on the CRO cross, and move the camera until the two crosses line up. From there we move the CRO itself until the reflection from the CRO is lined up with the crosses.
So, step 1 is: Make crosses. In Katie’s post yesterday you saw how the cross was made on the back of the CRO. We also had to re-make the cross on the W-unit. Armando made one using some wire and a rubber band to keep it tight, but the rubber band disintegrated over the last few months. For some reason, it fell to me to attempt to re-create some fine Italian craftsmanship:
We replaced the rubber band with Katie’s hair tie.
Step 2 is: Line up the CRO secondary and instrument axis using the cross at the instrument and the mark on the bottom of the CRO.
Alfio and Marco set up Laird’s camera on Vanessa’s tripod to check the alignment of the CRO.
Step 3 is: move the CRO (this time by moving the secondary vane-ends) so that the reflection of the measuring camera itself. off the secondary, is centered on the crosses.
The final result: The new fiducial cross of tape on the CRO (thick orange X in focus in center) is lined up with the cross of string on the W-unit plate (out of focus) lined up with the dark rectangle which is the axis of Laird’s camera.
Step 4: blog it
Done.
Alfio, Marco, and Katie depart the Clay telescope, heading down for lunch.
Today we finished the Clio cool-down, and after lunch moved Clio from the Aux and mounted it (her?) on the telescope.
After re-seating a vacuum hose, we got Clio down to 55KKatie, Vanessa, and Victor unhooking Clio from its resting place in the Aux.Vanessa admires her handiwork. Clio is back on the telescope, ready to go.
After Clio was on, the grad students kept working.
This is what life’s like when you’re a NASA Sagan Fellow. Or so I’m told.
After dinner, we proceeded with aligning the system for CRO tests.
An almost round (opinions vary) pupil using our alignment laser. This is light reflected off the secondary, into the CRO, and back off the secondary.
A herd of burros came to the watering hole close to the lodge today.
A baby burro.The south end of a north bound burro.
We missed sunset tonight, but we never miss a Vizzy photo-op.
A perfect Vizcacha profile.A moon shot by Vanessa.
Quotes:
Laird: “If we don’t get good suckage, it’s not going to work.”
Laird: “It’s like yoga”
Povilas: “It’s like hot yoga!”
Laird: “I often get a little confused about what’s hot and what’s not.”
Vanessa: “I only took 4 pictures today. I wasn’t very productive” (the blog is our #1 priority)
The MagAO team got a lot bigger today. Laird, Katie, Alfio, Marco, and Vanessa arrived at LCO today. Marco took some pictures after they all met up in Santiago.
Laird, as is his wont, caused all sorts of trouble at the airport(s). He doesn’t have all of his luggage yet.Laird, Alfio, and Marco waiting for the ride. This time they got to ride in comfort on the LCO Express.
Katie sat in the front of the bus, so she took some pictures of the drive.
A La Serena neighborhood.La Serena traffic.Marco speaks Spanish well, so he always makes friends.The drive takes you along the ocean for part of the way. It’s nice.The bus has just pulled up to the Babcock Lodge
No rest for the weary. After dinner we charged up the mountain to get to work.
Vanessa was introduced to Vizzy after dinner.Katie is tightening some screws on Clio.Katie and Vanessa got Clio started up.Laird arrives at the top. MagAO Commissioning run #2 has begun.
We also set a record today, with the arrival of Vanessa:
We’re pretty sure this is the largest number of graduates of Brookings High School (South Dakota) ever to occur at LCO. Go Bobcats!It never gets old. Yuri was right though – no green flash.A pretty mountain view just after sunset.
And finally, though we couldn’t watch it, we note the outcome of the battle of the Aux building:
