About Benoit Guertin

Astronomy Blog: I started out with a 5.1in Newton on EQ3 mount, and developed a passion for photography when I figured how to connect a webcam to the scope. Ever since I've been hooked. My computers and engineering background make for a great match in understanding signal to noise ratio and image processing. Living near a big city, I have little choice but to leave it to the electronic eye and do my "observations" from a computer screen. Toy Review Blog: When I was young boy I took most of my toys and appliances apart to understand how they worked, and see how they were put together and imagined how I could improve them. Now as a father of three kids (one boy and two daughters) I have seen, purchased, received and played with my fair share of toys. I also have a bachelor's degree in Mechanical Engineering, and currently employed as System Architect in the Aviation Industry.

Wide Angle Photography – Perseus

Image

Shooting wide angle long exposures of the sky is always fun, because you never quite know what you will get. On an August night I decided to take a few 20 seconds exposures of the constellation Perseus hoping to catch a few open clusters.  However got surprised by the faint glow of Messier 33 (Triangulum Galaxy) in the photos. This is the furthest object that can be observed to the naked eye, located 2.7 million light years away, and part of the Local Group which includes Andromeda and our Milky Way.

Constellations Perseus and Triangulum (Benoit Guertin)

Constellations Perseus and Triangulum (Benoit Guertin) – CLICK FOR FULL SCREEN

4 x 20 seconds
ISO 6400
17mm F4.0
Canon 80D
August 30, 2019

Ending the Year with Betelgeuse

A few days prior to the holiday break there was news of Betelgeuse dimming to an all-time low, potentially signaling the start of the process that will transform this star into a Supernova. What? Wait a minute… A star in our own galaxy exploding? But that hasn’t been observed since 1604!

Remnant of SN1604 (NASA)

Remnant of SN1604 – last galactic nova (NASA)

There are plenty of novas at any point in time, they just happen to be in galaxies far away (cue Star Wars intro). During those few days or weeks of otherworldly explosions these stars become the brightest object in their host galaxies.

SN2018ivc in galaxy NGC 1068 (Credit: Bostroem et al., 2019.)

SN2018ivc in galaxy NGC 1068 (Credit: Bostroem et al., 2019.)

So if we can see them when they are millions of light years away, what would an exploding star just 700 light years away, like Betelgeuse, look like?

Well if we base ourselves on SN1604 it will be visible to the naked in eye for three weeks, including during daytime. SN1604 was 20,000 light years away, while Betelgeuse is at a fraction of that, so most experts anticipates that it would be as bright as a full Moon.

Now before we go crazy anticipating when Betelgeuse, a red super-giant, will explode, let me present some information to put everything in perspective.

Betelgeuse is a red super-giant of class M1-2 in the constellation Orion, 2nd in brightness just after Rigel. Betelgeuse is one of the largest start we can see when glancing up at the night sky. If Betelgeuse was our Sun, it would engulfed all planets up to Jupiter. Stars of that size aren’t like the nice Smith Ball of fire we imagine our Sun to be. They are more like a loose ball of foam, constantly bubbling and bloating from the incredible heat created in the inner core. If you are starting to think unstable, you are partly right.

Betelgeuse is also a well documented variable star, meaning it periodically varies in brightness.

Recorded Brightness of Betelgeuse Over the Years (credit: AAVSO)

Recorded Brightness of Betelgeuse Over the Years (credit: AAVSO)

So while it is at an all-time low compared to its known ~425 day cycle, it also has a ~5.9 year cycle, and this episode just happens to be a combination of both lows. So no need to panic… for now.

Betelgeuse will one day end as a type II supernovae, probably not for another 100,000 years. Until then we can all glance up during these cold winter nights at how easily the Orion constellation can be spotted and enjoyed. The three bright stars marking the belt and the hour-glass figure is easy to find. Take a few moments to look at Betelgeuse as on a galactic scale it will be gone tomorrow.

Betelgeuse Red Super Giant in Orion (Benoit Guertin)

Betelgeuse Red Super Giant in Orion (Benoit Guertin)

For the Moon, leave the tripod behind

Most people don’t plan to take photos of the Moon, they just happen. You are outside doing something else and then you spot it over the horizon or high in the sky: “Hey that’s a pretty Moon tonight Maybe I should take a photo!”

I find that normal camera lens, even telephoto don’t do it justice. The setting and focus can be very tricky. The multi-lens setup of telephoto can also cause internal reflections or chromatic aberrations making the resulting photo less appealing.

So just grab the telescope tube and leave the tripod behind.  If you have a small APO refractor you can simply hold the tube, but for anything heavier you’ll need to prop yourself up on something like a railing or a car roof.

The photo below is a single shot at 1/250sec and ISO400 with Canon 80D and William Optics Gran Turismo 71 held on the end of my arms.

2018-08-31

80% Illuminated Moon on August 31, 2018 [Benoit Guertin]

The setup takes only a few minutes and the results are always worth it.

Mars and the Milky Way

Campgrounds are offer good occasions to observe the night sky; away from the city lights or industrial parks.  And with little more than a camera on a tripod, some fantastic pictures can be taken.

But there are two drawbacks:
1) Campers make campfires that create a haze near the ground.
2) Trailers and vehicles often have lights on that ruin the show.

Mars (left) and the Milky Way - Benoit Guertin

Mars (left) and the Milky Way – Benoit Guertin

Leaving the city lights behind

Nothing like leaving the city lights behind and heading to a rural camp ground to check up on our galaxy.

Every summer the galaxy presents itself across the sky in the norther hemisphere, an ideal time to enjoy the view and spot a few open cluster along the way.

Aquila-2018-08-08.idents

Canon 80D 17mm F/4 ISO6400
Stack of 10 x 10 seconds
No tracking

Messier 3 and a Fast Moving Star

A few weeks ago after taking some photos of Jupiter, I changed my setup to do some long exposures on an easy target: a globular cluster. Unfortunately I forgot to note down the name of what I had photographed!  So a few weeks later when I found the time to process the images I was at a loss to identify what Messier object it was. However, after an evening of matching up stars surrounding the cluster and I was able to correctly identify it as Messier 3.

Globular Cluster - Messier 3 (Benoit Guertin)

Globular Cluster – Messier 3 (Benoit Guertin)

The above was taken with my Skywatcher 80ED and Canon 80D. It is a stack of 27 x 10sec exposures at ISO3200 on an unguided and roughly aligned mount.

Looking at my archives I found that I had imaged M3 about 10 years ago with the same telescope, so I decided to align both old and new image and see if anything would stand out. And to my surprise, spotted one star that appeared to have shifted. To help identify the star I colorized one of the photos and subtracted from the other (done in GIMP).  All the stars within the field of view lined up except this one; the two colored spots are not aligned!

High PM Star BD+29 34256

High PM Star BD+29 34256

To be sure this wasn’t on an error on my part I did a bit of research and found it to be a know high proper-motion star BD+29 34256.

It’s not everyday someone with amateur backyard astronomy gear can show how a star has moved in 10 years.

It’s a good time for Jupiter

The last time Jupiter was in a favorable position for good photos was 2010, so while I have photographed the planet a few times since, the results weren’t really satisfactory.  So on July 7th, finally took the equipment out and set my mind to image some planets (Venus was also in a good position).

As luck would have it, the Great Red Spot was pointing our way, and landed my best shot of it yet. We may be past the May 2018 sweet spot for opposition, but that doesn’t mean you should not attempt to observer or photograph the Jupiter. Still plenty of good days ahead.

Jupiter with moons Europa (left) and Io (right)

Jupiter with moons Europa (left) and Io (right)

I took about 11 video sequences of the planet, and sure enough the last one yielded the best result. I guess as the evening progressed, the air cooled and provided for better viewing.

Skywatcher 80ED
Televue 3X barlow
Vesta Webcam with IR/UV filter
Processing with Registax and GIMP.