Constellations at the Zenith

We don’t often look “straight up”. Unless you are laying down, it’s not a comfortable viewing position. However there is lots to see and the Big Dipper (Ursa Major) is right overhead this time of year.

Setting up a camera with a 10 second exposure can capture quite a good deal of the sky, and you don’t have to worry too much about star trails. What stands out is the large variations in the colors of stars, from cooler deep reds, to hot bright blues.

Constellation Near Zenith 08May2018

Constellations right above in the May evening.

17mm f/4
Canon 80D (ISO 3200)
12 x 10sec (2 minutes)

M44 Beehive Cluster

Image

In one of my previous post I mentioned how Messier 44, the Beehive Cluster, would be an easy find the evening of April 22-23, so even if I took this photo on the 21st, the same evening that I took a photo of the Moon, all I needed was to moved a few degrees north after observing the Mooon to image this large open cluster.

Messier 44 - Beehive Cluster. Benoit Guertin - with Skywatcher 80ED and Canon 80D

Messier 44 – Beehive Cluster. Benoit Guertin – taken with Skywatcher 80ED and Canon 80D

Photos of open clusters with small refractors always lack the diffraction spikes that really make the stars stand out.  So a little photo editing did the trick to spice up the image.

Skywatcher 80ED
Canon 80D ISO 3200
Stacked 22 x 10sec

Never Wait for a Full Moon

The Moon should be the first thing you look at the day you get to peer through a telescope. It should also be the first thing you photograph.  However don’t wait for a Full Moon.  Sure a large round moon over the horizon can be breathtaking, but most of the subtle details of the lunar surface disappear under a Full Moon.  The lack of shadows blends away the peaks and valleys, crevasses and ridges. It is really this dance of light and shadows that makes the craters stand out.

Click on the image below for full resolution.

April 21, 2018 Moon. Benoit Guertin

Lights and shadows….

The photo above is a single shot with Skywatcher 80ED telescope and Canon 80D (ISO 200, 1/125s)
Wavelet analysis with Registax.

Photo – Sun April 21st 2018

After a weeks of clouds, rain and even snow, I finally get a sunny weekend without a cloud in the sky.  With the warmer temperatures, time to take the telescope out. Unfortunately no significant sunspot happening on April 21. Just a small region (AR2706) on the western part of the sun.

Canon 80D (ISO 100, 1/400s)
Skywatcher 80ED (80mm F/7.5)

Sun with sunspot AR2706 (21-apr-2018). Benoit Guertin

Sun with sunspot AR2706 (21-apr-2018). Benoit Guertin

Blue Moon Lunar Eclipse

The second Full Moon in a month is generally called a Blue Moon. And yes the old saying “once in a Blue Moon” is in reference to this rare event.  Well… if you consider every 2 to 3 years rare. However this one will be extra special because it won’t be blue at all!  It’ll be blood-red because we’ll have a lunar eclipse on our hands!

LunarEclipse_27sep2015

September 27th 2015 Lunar Eclipse

The lunar eclipse will be visible from most of North America, but people out West will be better placed to see it.  In the East, the we’ll only get a partial eclipse as the moon sets in the early morning on Wednesday the January 31st around 6:48am EST.

If you do plan to photograph a lunar eclipse, a tripod is strongly advised, and if you are using a telescope, an equatorial mount is required. The above photo is a single frame at 2.5 second exposure and ISO400 with a Skywatcher 80ED. Yes those are a few stars popping into view during the eclipse.

 

 

 

Setup for the Geminids

With the Geminids peaking tonight and a clear sky after two nights of snow, I charged the camera battery and got a quick setup going to take some pictures of the sky.  As for any nigh sky photo, both lens stabilizer and auto-focus is set to OFF and focused manually at infinity. Then found a corner of the yard shielded from stray lights and planted the tripod, roughly aiming the camera 70deg up and pointing east (the constellation Gemini was rising at 10pm).

However at -15C outside, the old battery wouldn’t last very long.  I left it running for about 30 minutes, taking 20 seconds exposure at ISO 800 with a 17mm F4 lens.  The camera is now thawing (covered with frost after bringing it indoors) and will wait until tomorrow before checking the pictures out.

Setup for the 2017 Geminids

Setup for the 2017 Geminids

In the brief moments that I was outside I caught a 2-3 meteors and one really bright one (easily visual magnitude -4). So even living in the city, the Geminids are visible and accessible to all.  With my feet deep in snow I wasn’t dressed well enough to hang around in the cold wind to watch the show for long. So I hope the camera managed to capture a few.

Watching the Geminids

It’s that time of  the year again: the Geminid meteor shower. It is visible almost all the month of December, however the best and peak viewing, with up to 120 meteors an hour, is between December 12 and 15.  It should be a good year because we are heading towards a new Moon on December 18th, so no bright moon to ruin the show.

This meteor shower is called the Geminid because the radiant (apparent direction of travel in the sky) of the meteors is centered on the constellation Gemini.  However the source of the debris is not a comet like most other meteor showers, but an asteroid: 3200 Phaethon. The asteroid and orbit were discovered in 1983 and is too good of a match with the Geminids to be anything other than the source of the debris. However its makeup is closer to asteroid belt material, so it may very well be a 5km chunk from a larger asteroid, with all the associated debris.

To watch the Geminids, the best time is past midnight as the constellation will rise east around 10pm.  The higher it is in the sky the better. The Geminids do regularly create fireballs: bright displays that can exhibit colour and even leave a smokey trail, so observation even in light polluted city sky is possible.

Here are some tips for the observation:

  1. Dress to be warm.  You’ll be sitting still in the cold night. Nothing will get you indoors faster than the shivering knowing that warmth is only a few feet away.
  2. Lay down or recline in a chair.  Standing and looking straight up is very uncomfortable and quite the strain on the neck.
  3. Give yourself a good 15 minutes for your eyes to adjust to the darkness  If you give up after 2-3 minutes, your eyes are still adapting to night vision and will miss the fainter meteors.
  4. Find a spot away from sources of lights.  Of course heading out of the city is best, but if you can’t, just find a spot in your backyard without the glare of street lights and neighbors’ porch lights. That also means no electronic screens to ruin your night vision.

You can also setup a camera on a tripod to see if you capture some of the meteors. Grab a short focal length, remove auto-focus and go for a 10-20 second exposure setting.

Clear skies!