I drove out to Sunset Crater tonight to get a shot of an Iridium Flare, and brought my equatorial mount with me to follow up with some images of Comet Jacques. Its beautiful turquoise coma was drifting through the Cassiopeia Milky Way this evening and showed up even in my 20-30 second wide angle tripod shots. The images below are from stacks of 3 3-minute exposures at 55 mm from the Canon T3i on the SkyView Pro equatorial mount.




The Belt of Venus rises behind the Discovery Channel Telescope

On June 17th, I joined Tom and Jennifer Polakis, Michael Collins and Stephen Levine at the Discovery Channel Telescope for a special visual observing project that Tom coordinated with Lowell Observatory, the DCT team and Astronomy Magazine. My role in this incredible adventure was to create quick sketches of the objects we observed. That's right—sketching with a 4.27 meter telescope! Dream. Come. True. ...Matches pretty well with the title of Tom's article, "A Dream Night with the Discovery Channel Telescope". This observing run was an incredibly unique situation, at just the right time--something that won't happen again...as much as I wish it could!

The Discovery Channel Telescope is located at the top of an old cinder cone about 40 miles southeast of Flagstaff, near Happy Jack. It was constructed as a partnership project between Lowell Observatory and Discovery Communications. Our opportunity to observe there was coordinated by Tom and Stephen just before the facility was set to become fully operational.

When I drove up to the gate just before sunset that evening, everyone else had arrived and they were busy shooting photos, exploring the grounds, and circulating in awe inside the facility. My first impression as I crested the last flight of stairs to be face to face with the scope was, "I can't believe I'm actually standing here." The top deck of the dome was spacious, painted light gray with the huge fork mount accented in rich blue. The shutters were all wide open--not just the main aperture, but a large opening on each facet of the dome. Three-hundred sixty degrees of surrounding forest and distant landscape were lit by the warm hues of the setting sun, and easily visible while standing next to this amazing instrument.

The telescope itself was a wonder of enormous, pristine gears, struts, solenoids, cables and inscrutable instrumentation surrounding the enormous 4.27 meter primary mirror: a beautiful, meticulously crafted sea of glass open to the air and easily within arm's reach—if one were to be so reckless. High above, the convex 1.4 meter secondary mirror was a work of wonder in itself.

The 4.27 meter primary mirror and active optics infrastructure

The 1.4 meter secondary mirror

As I brought my sketching supplies up to the dome, the rest of the group was taking in twilight views of the Moon and Saturn. In between those views, Michael reminded me that the Belt of Venus was starting to emerge over the eastern horizon. I ran outside, scaled a hillside just inside the fence, and grabbed some shots of the dome and Belt of Venus for some panorama stitching later. (See image at the top of this post--the magazine ended up using that shot as the lead spread photo for the article.)

Jennifer Polakis, Tom Polakis and Mike Collins enjoy sunset through the DCT shutters

As twilight darkened, Saturn was the dramatic warm-up act. At 865X the crisp, bright, huge view of the planet was a foreshadowing of great things to come. I decided to embarrass the entire group by taking a few quick iPhone photos through the eyepiece. Tom was prepared for a more professional approach and while we waited for the sky to get darker, he hooked up his imaging equipment and captured some video for processing later.

iPhone photo of Saturn through the DCT

Tom Polakis takes in a twilight view of Saturn

A dragon-esque ponderosa pine guards the perimeter as twilight deepens

Once the imaging run was complete, the scope slewed over to our first deep sky target of the night:

NGC 6543 - Cat's Eye Nebula

When my turn came at the eyepiece, I peered in, and was a kid experiencing the opening scene of Star Wars for the first time. Seriously. Turquoise light sabers twirled in a fluid dance had burned a gorgeous spirograph pattern in the eyepiece and straight into my mind. How could a telescopic view be so perfect? Once again I was working to pull myself out of the "I can't believe this is happening..." frame of mind. I had a sketch to pull off, a unique experience to record.

DCT sketch of NGC 6543 (Cat's Eye Nebula)

Drafting such a geometrically complex and stunning view in a few short minutes is an impossible task. I needed to shorthand the sketch and capture the key structures for re-creation later. Everything in the sketch was direct vision, but there was much more to be seen and recorded. I can only imagine what would happen if I was able to exercise a couple hours plus averted vision into the process.

I had another ten sketches to go, and a lot more dorky things to exclaim each time I stepped up to the eyepiece. Unfortunately, I didn't record the order in which we viewed all the objects, but this is roughly the order:

Messier 64 - Blackeye Galaxy

As tight as the view was, it was difficult to get oriented at first. But what was very clear was the flocculent texture showing up around the northeast half of the galaxy's core. The intricate dust band was rich with lumpy texture and continued around the entire core, but was much less distinct on the other side.

DCT sketch of Messier 64 (Black Eye Galaxy)

Abel 1656 - Coma Cluster

The core of this galaxy cluster served up 13 galaxies.

DCT sketch of Abell 1656 (Coma Galaxy Cluster)

Messier 51/NGC 5195

Like M64, this was a disorienting experience, due to the tight field. The structure was rich and extremely complex. The field was littered with lumpy structure and HII regions that defined its spiral arms. If I could spend a couple more hours with the Cat's Eye Nebula, I could spend a couple more nights with this view before I could hope to grasp the range of detail that was available.

DCT sketch of Messier 51

After viewing the core of M51, we switched to the core of NGC 5195. I'm not as happy with this sketch. It's pretty stylized, but captures the dark dust band reaching across its core and some variations in brightness I picked out.

DCT sketch of NGC 5195

Messier 57 - Ring Nebula

Once we hit the Ring Nebula, I wondered whether the central star would be an easy catch—and...not even a contest. The central star was bright and clear, and three more stars were visible, enmeshed in the nebula. The edges of the nebula had a furry appearance, which is difficult to depict in the sketch at this size, since it's similar in scale to the texture of the paper which shows up through the rest of the drawing. Tom noted some subtle red around the outer fringes of the nebula that I didn't notice while focusing primarily on structure.

DCT sketch of Messier 57 (Ring Nebula)

Messier 13

The view of M13's core was a swarm of distinct stars, many of them orange in color. At first it was like seeing through the cluster. But I started to get a glimpse of what looked like stronger, unresolved luminosity toward the center, and some patchiness to it.

DCT digital illustration of Messier 13

Up next are a trio of complex planetary nebulae. It's unbelievable how much detail is available in these stunning objects.

NGC 6826

DCT sketch of NGC 6826

NGC 6905

DCT sketch of NGC 6905

NGC 40

DCT sketch of NGC 40

PK 80-6.1 / CRL 2688 - Egg Nebula

I had an opportunity to make a request for one of the objects we would view, and chose the Egg Nebula. What a privilege to witness energetic stellar dynamics, seemingly up close and in person. I could visualize a heavy disk of material hiding the brilliant central star while jets and bubbles of expelled material glowed brilliantly, sculpted with geometric precision. Informed by Tom's suggestion about this object a few years ago, I brought out the polarizing filter and was pleased to see that it responded by dimming noticeably when the filter was rotated to a specific angle.

DCT sketch of PK 80-6.1 (Egg Nebula)

At one point during the observing run, the group pulled up Pluto. I took that opportunity to run outside and grab some shots of the dome against the sky.

Delphinus leaps overhead as the DCT slews to its next target

Moonglow washes over the DCT

Jennifer was also gracious enough to grab some shots while I was up on the ladder working up some sketches.

Sketching at the eyepiece of the DCT (exposures by Jennifer Polakis)

The flood of data that will start rushing in from the DCT will help refine our understanding of the universe, but I'm grateful we had a chance to connect the raw sense of wonder that inspires curiosity about what makes these powerfully beautiful objects tick.

The Summer Milky Way is framed by the main dome shutters.


Night Shots with a New Camera

After ten years with my Canon EOS Rebel-S/300D, I just upgraded to a new Canon T3i. First light last week consisted of a series of night shots down my street featuring Orion and a moonlit sky. Going from 6 Mexapixels to 18 is kind of startling, but one of the biggest benefits is Live View focusing. Pulling up a bright star on the LCD, temporarily magnifying 10X and then focusing into maximum sharpness is awesome. No more roughing in focus, exposing, reviewing the shot, delicately tweaking focus, re-exposing, re-reviewing, etc. etc. Auto noise reduction, and overall low noise at high ISO is also excellent.

Keeping the lens wide open at f/3.5 lets me drop the exposure down to 10 seconds & keep star trailing from being an issue. The trade-off is purple fringing on stars is pretty rampant at that f-stop & processing that garbage out of the image kills some of the star color. Color is a lot better around f/7.1, but then I need a longer exposure and get trails.

Orion nightscape

First light - Orion nightscape

On Monday night, I drove out to Sunset Crater National Monument to brew up some sketches and decided to give the T3i a panorama challenge before starting the drawings. During the course of the observing run, I noticed the sky was deteriorating gradually, with a smooth haze. I kind of thought it was air glow related. As I was processing the set of images later, they confirmed that air glow was on hand, with a sturdy, green glow showing up beneath the arch of the Milky Way.

Night Lights over Sunset Crater

Night Lights over Sunset Crater

The panorama I shot is composed of 17 separate images. Each image shot at 18 mm, f/3.5, 10 seconds, ISO1600. Photoshop has major grievances with stitching together astrophotos and low contrast cloudscapes and that kind of thing. It's really frustrating. So I tested out a bunch of pano/stitching apps, and the one that I had actual degrees of success with was PTGui. It grabs focal length from EXIF, lets you set matching control points across different image pairs so the software knows what to line up, offers alternative masking opportunities, you choose your projection style, and tons of preferences I haven't even glimpsed into.

If panoramas weren't such a pain in the neck to shoot & process, I'd almost want to do 2 sets of shots: f/3.5 + 10 seconds for luminosity, and then merge with f/7.1 + 20 seconds for color. Not happening on panorama stuff I'm pretty sure.


Crescent of Venus - January 3, 2014

iPhone photo of Venus through 8-inch Dob at 120X - January 3, 2014

Click image to view larger version.

Observation Notes:

After some amazing solar views, we were treated to the beautiful sight of two slender crescents. Brilliant Venus was an astonishingly large but slender arc of brilliant white descending into the treetops. The Moon was much higher, but captivating with its rugged craters and maria captured in stark relief on a much larger crescent.

Crescent of Venus descending into the treetops - January 3, 2014

Crescent of Venus descending into the treetops - January 3, 2014 - Through 8-inch Dob at 32X.

Click image to view larger version.

Waxing crescent Moon - January 3, 2014

Waxing Crescent Moon - January 3, 2014 - Through 8-inch Dob at 32X.

Click image to view larger version.

SubjectVenus and Moon
Date/TimeJanuary 3, 2014 5:30 - 5:40 PM MST
(January 4, 2014 0030-0045 UT
Observing Loc.Flagstaff, AZ - Home
InstrumentSkyQuest XT8 - 203 mm f/5.9 Dobsonian
Eyepieces/Mag.32 mm Sirius Plössl (37.5X)
Pentax XW 10 (120X)
ConditionsClear, breezy
SeeingAnt. II-III


Solar White Light Sketch - January 3, 2014 - 2230-2345 UT

White Light Solar Sketch

Move mouse over sketch above to view labels
Click image for larger version.

Photo of Sun - January 3, 2014

iPhone photo of Sun through 8-inch Dob.

Click image to view larger version.

Observation Notes:

Enormous and complex sunspot group AR1944 put on a great show on the sun today. My son and I were able to view it without magnification using just our eclipse glasses. Through the telescope, it was a mass of large and small spots covering a huge area about the size of Jupiter. Several other spots freckled the surface. In addition to the sketch, I grabbed a few shots through the eyepiece with my iPhone. They managed to show some details for hack photos.

SubjectSolar White Light
Date/TimeJanuary 3, 2014 3:30 - 4:45 PM MST
(January 3, 2014 2230-2345 UT)
Observing Loc.Flagstaff, AZ - Home
InstrumentSkyQuest XT8 - 203 mm f/5.9 Dobsonian
Eyepieces/Mag.32 mm Sirius Plössl (37.5X)
Pentax XW 10 (120X)
ConditionsClear, breezy
SeeingAnt. II-III


The Cerulean Arc

My weblog for
everything else non-astronomy

Pin at will!

(Thanks for maintaining
return links.)

Find recent content on the main index or look in the archives to find all content.

Recent Comments

  • Jeremy Perez: Thanks Andrew! These rare moments with huge research instruments that read more
  • Andrew Cooper: Beautiful sketches! I had an evening once on the 2.3m read more
  • Anonymous: Thank you for your reply, Jeremy, but what I really read more
  • Jeremy Perez: Yes, I've seen that effect, although I've mainly noticed it read more
  • Anonymous: Dear Jeremy I have read with great interest your notes read more
  • Louis Benoist: Beautifull, a million years of evolution, brings together, a read more
  • Jeremy Perez: Thanks Eric! read more
  • Eric Graff: Hi Jeremy, That white light sketch is just awesome!!! The read more
  • Jeremy Perez: Thanks very much Jen! Too bad we didn't get a read more
  • Jeremy Perez: Thanks Andrew! It's really impressive. I haven't had a chance read more


Monthly Archives

Powered by Movable Type 5.2.3