Neptune

I’ve always had an interest in astronomy¬† and have dabbled in astrophotography since I got my first digital camera back in the late 1990s. Over the years I’ve got images of all the planets except Neptune and Pluto. The latter of these is never going to be an easy target for the lazy amateur (me), but maybe, just maybe Neptune is possible.

I’ve had a soft spot for Neptune since the Voyager 2 flyby in 1989 – I’ve still got the article I tore out from a newspaper at the time.

Newspaper article on the Voyager 2 flyby of Neptune in 1989
Newspaper article on the Voyager 2 flyby of Neptune in 1989

As it happens, Neptune is nicely placed in the sky right now – just between Venus and Mars and close to a couple of guide stars.

Braving the frost, I took the camera out to the garden, mounted it on a slightly wobbly tripod and took some images of the general area of sky I knew Neptune was lurking. Some processing and stacking with ImageJ  and I had a star-field that might contain my target.

A starfield - neptune is here somewhere
Mars, Neptune and some stars though the trees

 

It’s easier to see the faint points of light of the guide stars and Neptune if you invert the colours, so you’re seeing black points on a white / grey background.

I used Stellarium to predict the current positions of Mars, Neptune and the guide stars and overlaid that on top of my image stack. This lined up reasonably well, there are some angular offset and slight scale differences between the two images, but it’s close enough for guidance.

neptuneoverlay
A prediction from Stellarium overlaid on top of my stacked images

With the assurance that I had Neptune in my images I was able to definitely pick it out from the stellar background.

neptune
Success!
Neptune has been imaged

Success!

Some technical details:

  • Camera:¬† Nikon D7000
  • Lens: AFS Nikkor 55-300 at 200mm
  • Exposure: 5 seconds
  • 20 exposures stacked with ImageJ

Lunar Eclipse September 2015

I do like a good eclipse, but not enough to be awake at 3am to photograph it. So, I set up a camera to take one picture every 30 seconds, pointed it roughly where I expected the moon to be at the time of maximum eclipse and set it recording.

Stacking the images with StarStaX produced this rather different view of the eclipse.

Luna Eclipse
Time lapse stacked images of the Lunar eclipse of September 2015

Using the same photographs I produced a video of the eclipse too. It starts dark until the moon moves into shot, then the moon fades out nicely, you can see the shadow of the Earth moving down the face of the moon, and then the moon reappearing.

Perseids meteor shower

I watched the meteor shower from the field at the Secret Nuclear Bunker where a group of us were camped doing radio stuff including bouncing signals off the ionized gas trail left by burned up meteors (meteor scatter).

I captured this time-lapse video which does include a few meteors as well as a pass by the ISS. The bright blob moving in from the left is the moon.

The circular trails are the stars moving across the sky around the pole star (not quite in frame)

A pretty visitor to the garden

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Garden Tiger (Artica caja)

A nice Garden Tiger (Artica caja) spotted this morning on the grass in the garden.
It’s a widespread moth, strikingly colored and patterned.
I’ve not seen the larval form on any of its likely food plants, so have no idea if there will be more appearing soon.

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Garden Tiger (Artica caja)