Jul 222014
 

Great Nebula in Hercules

 

The Great Nebula in Hercules, M13 contains about 300,000 stars. It is a globular cluster that resides within our own Milky Way Galaxy. M13 is roughly 25,000 light years from Earth. (The Milky Way is somewhat greater than 100,000 light years in diameter.)

This image represents a total exposure time of 4 hours 26 minutes. Each individual exposure was 5 minutes long, using a Canon 6D DSLR camera on my  Takahashi Mewlon-250 telescope at f/19.2. The telescope was autoguided. Images were calibrated, aligned and stacked using Deep Sky Stacker 3.3.2. The resulting stacked image was edited using Adobe Photoshop CC.

Nov 262013
 

M42 Orion NebulaNext time you see the constellation of Orion, find the three stars forming the sword just beneath Orion’s belt. If you look carefully at the middle star in the sword, you may notice that it looks a little fuzzy. It looks smeared out because it isa nebula containing many stars, that glow amidst vast regions of gas and dust. The bluish color comes from reflected light emitted from hot, young stars that have recently formed in this “stellar nursery.” The reddish color is due the red light that is emitted when ionized hydrogen nuclei (protons) recombine with electrons and form neutral hydrogen atoms.

The large red and blue smear curving down toward the right is M42; the small pink arc connected to its upper left is M43. The bluish nebulae surrounding the bluish stars above surround a dark void are sometimes called the “Running Man.” Can you see his head, arms and legs?

I captured this photo on the evening of November 21 by combining 22 3-minute exposures with a Canon 6D camera, a Takahashi FSQ-106 telescope at f/5, autoguided.

Nov 262013
 

M33 Triangulum GalaxyThe Triangulum Galaxy (M33) is a member of the Local Group of galaxies that includes the Milky Way, the Andromeda Galaxy (M31) over fifty other galaxies that are bound together gravitationally. M33 is somewhat smaller than the Milky Way and M31, and at nearly 3 million light years away is more distant than M31 (about 2.5 million light years). Under clear dark skies, M33 can sometimes be seen without a telescope as a dim patch of light about twice as wide as a full moon, making it the most distant object that can be seen with the naked eye.

To created this image, I combined 73 3-minute exposures on a Canon 6D camera connected to a Takahashi FSQ-106 telescope at f/5.

Nov 012013
 

M31After purchasing a new DSLR camera, a Canon 6D, one of the first targets I wanted to focus on was the Andromeda Galaxy, M31. This image was taken in morning of October 29. It represents a total of 135 2-minute exposures. Processing was done using ImagesPlus 5.5. Compare with an image taken in 2008.

Oct 202013
 

Comet ISON (C/2012 S1) is visible through a telescope in the early morning hours. I captured this image on the morning of October 6, 2013.

ISON_2013-10-06

Total exposure time was 24 minutes (twelve 2-minute exposures), tracking the comet, which moved appreciably against the background of stars during that time. This image was processed in a special way to prevent smearing, and to preserve the stars as points of light.

Comet ISON will swing around very close to the sun on November 28. If it survives its fiery encounter, it may be visible on the other side during the evening.

Check the Sky and Telescope magazine website for updates.

Jun 062012
 

A Transit of Venus (Venus passing across the face of the sun) is a rare event. This alignment of Venus directly between the Earth and the Sun will not occur again until the year 2117, when I am 169 years old. So I really wanted to see this one. Cynthia and I had planned to drive to Eastern Washington if the sky conditions there looked more favorable. But on the contrary, on Tuesday morning the forecast for East of the mountains looked worse than for here (cloudy to mostly cloudy). So we decided to stay on Whidbey and take our chances.

It was raining here early Tuesday afternoon, June 5 and the sky was overcast. The Venus transit was to begin at 3:06 pm. But this ever-optimistic astronomer went out to turn on his equipment in the observatory and set up the “sun funnel” he built for this occasion.

Friend Sue and second cousin Emily showed up full of hope, believing that anything is possible: for all we knew, we could get lucky and the sky could clear just in time. We couldn’t open the observatory dome right away, but by 2:30, the rain had turned to a light mist so we opened the dome.

Telescope at the Tinyblue Observatory

Takahashi 4" refractor telescope mounted on Paramount ME mount with sun funnel

sun funnel

This "sun funnel" is attached to the telescope eyepiece.

It was too cloudy during First Contact (when Venus first appears to touch the disk of the sun) and Second Contact (when Venus is completely inside the disk). But about 45 minutes after the transit started, the clouds thinned out a bit. We never had a clear sky, but the clouds were thin enough that we could see an image of Venus, along with a few sunspots and clouds drifting by.

Image of Venus crossing the face of the sun

Venus crossing the face of the sun

Transit of Venus

Transit of Venus about an hour after first contact

Cynthia viewing the transit of Venus

Cynthia viewing the transit of Venus

Be sure to take a look at the movies taken by the Solar Dynamics Observatory, which is an earth satellite in a geosynchronous orbit at an altitude of 22,000 miles.

So thank you, Sue and Emily and Cynthia for your optimism. I’m glad I don’t need to wait until I’m 169 to see my first transit of Venus.

Sep 052011
 

Measurements of the brightness of supernova SN2011FE are plotted on the AAVSO website. My data points (Observer TDW) appear with boxes.

By extending the curve through next week (when I won’t be able to make any new observations), I predict that the brightness (V-filter) at 00:00 on 2011-09-14 will be 9.6.

I’ll measure it at that time and compare with my prediction.

Aug 282011
 

The supernova in the Pinwheel Galaxy (M101) has now been designated “SN2011FE” (formerly “PTF11kly” which was even more difficult to remember). It continues to brighten. Comparing my measurements over the past two nights, it has brightened half a magnitude, from 12.9 to 12.4 in the past 24 hours. This is consistent with observations submitted by others to the AAVSO:

SN2011FE light curveThe total exposure time for the image below was 50 minutes. It shows a bit more detail of the Pinwheel Galaxy than the image taken the previous night (5 minutes).

SN2011FE V combined

Aug 272011
 

Last Tuesday, August 23rd, a new supernova was discovered by researchers connected to the University of California, Berkeley. Designated SN2011FE, the supernova was observed exceptionally early in its process of explosion. Scientists predict that SN2011FE will grow in brightness over the next couple of weeks, possibly becoming bright enough to observe with binoculars. Located in the Pinwheel Galaxy (M101) near the handle of the Big Dipper, the “new star” is 21 million light years away, meaning that it actually exploded 21 million years before last Tuesday! Supernovas of this type (Ia) result from binary star systems that eventually evolve into a white dwarf and another star that feeds matter into the white dwarf. Suddenly, a substantial fraction of the matter undergoes nuclear fusion, causing material to be expelled at about 3% the speed of light. For a few days or weeks, the brightness of the supernova can exceed the total brightness of the galaxy in which it resides.

Last night, I captured some images of the Pinwheel Galaxy. By comparing my images with an archival DSS (Digital Sky Survey) image, I could easily see the supernova. Here is the archival image, with two comparison stars, 138 and 140 labeled:

Pinwheel Galaxy, M101

 

 

 

 

 

 

 

 

 

 

 

Below is the photo I took last night, with the same two comparison stars identified:

M101 with SN2011FE

 

 

 

 

 

 

 

 

 

 

 

The two comparison stars, 138 and 140 are in our own Milky Way Galaxy, probably no more that 5,000 light years away. Supernova, by contrast lies in the Pinwheel Galaxy, 21 million light years away. So even though it looks roughly comparable in brightness to 138 and 140, it is actually many millions of times brighter.

I submitted my measurements to the American Association of Variable Star observers (AAVSO), which are shared with others to produce the light curve:

SN2011FE supernova light curve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If we continue to have clear skies for a few days, I plan on checking on the supernova each night as it grows in brightness.

Jul 282011
 

Vesta is one of the brightest asteroids, easily visible in a pair of binoculars. On July 16, NASA’s Dawn spacecraft went into orbit around Vesta and began sending close-up images.

Last night, I searched for Vesta, which was low in the south, at an altitude of about 20 deg, between some Douglas fir trees. If it hadn’t been for the tree cutting of some red alders for firewood last year, I wouldn’t have been able to catch Vesta at all. It was predicted to reach its highest point in the sky at 2:10 am this morning, so I decided to start imaging then.

Using the planetarium program, TheSky6 to find it, I thought I knew where to look. But alas, it wasn’t where the program said it would be! Then it dawned on me that maybe I needed to update the orbital parameters for the asteroid, as there must be better numbers available now than there were when I first installed the program. I then found the personal website of Marc A. Murison which includes a calculator of asteroid orbital parameters.

Just what I needed! Putting the new numbers into Vesta asteroid data of TheSky did the trick. The telescope went directly to the target. But it was still behind the trees, so I had to wait about half an hour. Fortunately I had Mr. Murison’s blog to read, which has some great political commentary and kept me awake.

I then started a sequence of images (10s exposure, clear filter, ST-8 camera, Takahashi FSQ-106 telescope) and went to bed for a couple of hours.

When I got up to check my images and close down the observatory, I discovered that there were about 40 minutes of good images, unblocked by trees. So I put together the following animation, in which successive frames were about a minute apart.

 Asteroid Vesta on July 28, 2011

In just 40 minutes, you can clearly see the asteroid moving relative to the background of stars.