Astrophotography – deep sky

Observing Log 15/12/2017 @ 22:36 – 16/12/2017 @ 02:04, LRO, Andy and Damian – first ever views of some faint nebulae

Observing Log 15/12/2017 @ 22:36 – 16/12/2017 @ 02:04.

Andy & Damian

LRO

What a night! Incredible views from the centre of Lichfield – we can only imagine what the views must have been like from a dark sky sight. Tonight, we saw things we have never seen before – at least by eye – and only ever expected to see on photograhpic images. Wow! Just goes to show – it is worth going outside in the freezing cold.

  • 10” Orion Dobsonian Telescope with Explore Scientific (ES) 20mm, 14mm, 9mm 100 degree apparent field of view (APOV) eyepieces and Telrad finder.
  • 80mm Sky Watcher Equinox Pro telescope on William Optics EzTouch Alt-Az mount with 31mm Nagler and 6mm Televue eyepieces and 8x50mm finder.
  • Sky Safari Pro 5 planetarium software on iPad

Photos through image intensified eyepiece (IS):

Orion Nebula (M42):

M81 and M82 Galaxies in Ursa Major (below) – note that the Image Intensified eyepiece has significant field curvature and coma towards the edges of the field so the thin smudge of the top left of this image is not another galaxy but a spread-out star:

Double Cluster in Perseus (below):

Observations:

Orion Nebula – Messier 42, Bright Nebula in Orion,15 Dec 2017, 22:36:35, Using my ten-inch Orion Dob in my back garden, standing in the snow, after tripping over the remains of the snowman built by Rhys and Hannah, and survived the treacherous and very slippery icy steps (and having put salt on them to keep myself alive), my first target was Orion’s nebula. Magnificent and stretching over half the field of view in my 14mm Explore Scientific (ES) 100-degree AFOV eyepiece. My eyes are poorly dark adapted, but the nebula looks green rather than grey tonight, suggesting the sky is very clear after the snow falls.

NGC 1975, Bright Nebula in Orion, 15 Dec 2017, 22:42:48, Visible other side of the fish-mouth, little detail visible.

Flame Nebula – NGC 2024, Bright Nebula in Orion,15 Dec 2017, 23:00:41, Definite observation of the Flame Nebula nebulosity. Once our eyes were relaxed, we could see filaments and tendrils over 1+ fields of view growing in brightness towards the main part of the Flame Nebula. Realised again it is a question of learning to observe this very faint object.

Messier 78, Bright Nebula in Orion,15 Dec 2017, 23:04:08, First ever observation of M78. Two stars with definite nebulosity. I thought it was an open cluster at first, but Damian realised what it was, and we star hopped around the area to confirm it.

Orion Nebula – Messier 42, Bright Nebula in Orion,15 Dec 2017, 23:05:20, Image intensified eyepiece – we could see tendrils curling around in circle behind M42 from tips of the wings of the nebula, these were not obviously visible in ES eyepiece. M43 also showed more detail in image intensified eyepiece BUT we could not see the Flame nebula in the image intensified eyepiece.

Messier 78, Bright Nebula in Orion,15 Dec 2017, 23:07:31, Seen in image intensified eyepiece (IS) but nebulosity less obvious (although still visible) than in ES.

Barnard’s Loop – Sharpless 2-276, Bright Nebula in Orion,15 Dec 2017, 23:25:05, I thought I could follow part of this – a C-shaped lightening as a strip at centre field of view – which I followed upwards and then right on to right in next field of view. Damian was not convinced so we will call this a possible observation only……

NGC 2244, Open Cluster in Monoceros, 15 Dec 2017, 23:29:33, First seen as definite smudge in Vixen 2.1x binoculars by myself! I am doing well tonight, as I have seen first most observations above. Damian mentioned NGC 2244 in his talk at RAG end last month. These Vixen binoculars are really growing on me as they do such a good job of identifying such objects. In ten-inch with 14mm ES, we saw definite structure in the Rosette Nebula itself and not just the star cluster. Wow! What a night! And from the centre of Lichfield. But it does require one of the clearest skies we have ever seen. In the IS only the stars of the cluster could be seen and not the nebulosity. This appears to show that the IS responds very poorly to very faint diffuse objects.

Messier 35, Open Cluster in Gemini,16 Dec 2017, 00:39:12, Damian tried out my Skywatcher Equinox Pro on his William Optics EzTouch alt-az mount. He found M35 with his Nagler 31mm, one of the most famous eyepieces of all time.

Pleiades – Messier 45, Open Cluster in Taurus,16 Dec 2017, 00:41:34, In 80mm with 31mm Nagler, masses space around stars just like binocular view. Never seen like this in telescope. Like binocular view -magnification 500mm/31mm = 16x magnification with excellent field of view much better than most binoculars.

Double Cluster – NGC 869, Open Cluster in Perseus,16 Dec 2017, 00:44:33, Likewise with 80mm Equinox and 31mm Nagler this gives excellent binocular view without aberration unlike most binoculars. Obvious uni-ocular view.

Stock 2, Open Cluster in Cassiopeia,16 Dec 2017, 00:49:03,80mm Equinox plus 31mm Nagler best view to view this. Looks like a man with Double Cluster at edge of field of view.

Double Cluster – NGC 869, Open Cluster in Perseus,16 Dec 2017, 00:50:17, Every bit of kit has its place. That includes a ten inch Dob with 20mm ES -spectacular!

Pinwheel Cluster – Messier 36, Open Cluster in Auriga,16 Dec 2017, 00:53:12, What a way to pan M36/37/38 in Auriga – the 80mm Equnix+31mm Nagler. Wow! Wow! Wow!

Pinwheel Cluster – Messier 36, Open Cluster in Auriga,16 Dec 2017, 00:54:39, Throw away the 80mm binoculars!

Double Cluster – NGC 884, Open Cluster in Perseus,16 Dec 2017, 00:55:41, Lovely view through 80mm Equinox with 14mm ES. More magnified at 37.5x although of course will not match light gathering and therefore brilliant diamond like quality of ten inch Dob. But 80mm is a lot more grab and go. Damian thinking of something similar for American trip in 2019.

IC 1805, Open Cluster in Cassiopeia,16 Dec 2017, 01:04:47, Started by identifying the cluster and checking it was correct by panning around and checking location. Once this was certain started looking for Heart Nebula.

Heart Nebula – IC 1805, Bright Nebula in Cassiopeia,16 Dec 2017, 01:05:59, Once we identified cluster we could then identify nebulosity. This is certain observation with tendrils of nebulosity evident. However, one criticism is applicable. If we did not know from or planetarium maps that this was the correct location could we be sure this nebulosity was not background star fields, too faint to resolve individual stars? Answer is we couldn’t as brightness only slightly different from elsewhere but once location established fact is we could see the nebulosity with certainty. Is this only going to be tonight when sky so clear? Possibly but in fact it is starting to mist up now so perhaps this is part of the skill-set l-learning to recognize things for what they are in the sky. Note all our observations so far have been by direct vision. Averted vision has not been required so far tonight.

Soul Nebula – IC 1848, Bright Nebula in Cassiopeia,16 Dec 2017, 01:13:01, Adjacent to Heart Nebula, also seen initially via cluster stars. Again, once identified, we could then start to see the nebulosity – becoming more obvious as we spent more time observing it – particularly one bright patch. Both Heart and Soul Nebula seen with ten inch and 20mm ES.

Messier 65, Spiral Galaxy in Leo,16 Dec 2017, 01:22:28, Failed to find these,

Bode’s Nebulae – Messier 81, Spiral Galaxy in Ursa Major,16 Dec 2017, 01:23:00, Neat little objects in centre of field inn 80mm – of M81/82 and M42 – with 31mm Nagler.

Damian then changed to 6mm Ethos for M42 inn 80mm. Masses of detail. Quite bright. The combination of Equinox and WO mount seems to work well.

Orion Nebula – Messier 42, Bright Nebula in Orion,16 Dec 2017, 01:37:54,80mm through IS M42 bright but M43 not visible. Smaller image means less affected by field curvature and coma inherent in the IS.

Finished observing @ 02:04 – sky too misty and its too cold and my secondary has fogged up!

Monoceros from the Window-sill – – -29/11/2017

Here’s a couple of the items we discussed at the last RAG meeting.

Hubble’s variable nebula, NGC2261 or C46, is only 2′ in size and therefore not really suited to the window-sill ST80. Will have a go with the SCT next time I go outside.

 

 

As a seasonal image, here is NGC2264, the Christmas tree cluster. I have turned it the right way up for anyone not familiar with it. It is a bit bigger than last-year’s version!

The star at the base of the “tree” is 15, or S, Monocerotis. The blue “halo” around it is not an entirely optical effect, as to quote Alan Macrobert in his book “Star-hopping for Back-Yard Astronomers”, it is “about as blue a star as you’ll ever see”.

A little session

Wow- sounds like some members have had some brilliant sessions over the weekend. Parental duties have got in the way for me a bit, but I did manage to get a out for a mini session on Friday night with the Dob and the Goto and managed to get some pics of M1. Thanks to Roger for some tips to improve my GIMP knowledge.

(SW130 p-ds, ZWO ASI224, 35 x 60s lights + darks and flats).

Image intensifier photographs from observing session 17-18/11/2017 (home-made image intensified eyepiece, Samsung S7 phone, Orion UK 10″ Dobsonian, Lichfield)

The following photographs were taken during the observing session at LRO, Lichfield, UK, by Andrew and Damian 17-18/11/2017. Photographs were taken from views through our two 10″ Orion Dobsonian Telescopes, using our home-made (ATM) image intensified eyepieces and my Samsung S7 smart phone hand held at the eyepiece end of the image intensified eyepiece.

The home made image intensified eyepieces were made using old 2nd world war image intensifier tubes purchased from ebay for £50 each a few years ago. They give good views although suffer from significant image distortion towards the edge. However, they represent excellent value for money and provide a quite different way of observing the night sky. Although technically what you see through these image intensified eyepieces is not a direct view of the night sky but instead an electronic image, they give an excellent “through the eyepiece” experience because of where they are located (in the focuser) and the intimate experience of observer and telescope is therefore retained, albeit with a green view!

Andy & Damian

Andromeda-Galaxy-Satellite-M31 & M32-Image-intensified-eyepiece-10-in-Dob-17-181117.jpg (below):

Christmas-Tree-Open-Cluster-NGC2264-Image-intensified-eyepiece-10-in-Dob-17-181117.jpg (below):

Crab-Nebula-M1-Image-intensified-eyepiece-10-in-Dob-17-181117.jpg (below):

Eskimo-Plantary-Nebula-NGC2392-Image-intensified-eyepiece-10-in-Dob-181117.jpg (below):

Galaxies-M81-M82-image-intensified-eyepiece-10-in-Dob-17-181117.jpg (below):

Hubble-variable-nebula-NGC2261-Image-intensified-eyepiece-10-in-Dob-181117.jpg (below):

Open-clusters-M35-NGC2158-image-intensified-eyepiece-10-in-Dob-17-181117.jpg (below):

Orion-Nebula-M42-image-intensified-eyepiece-10-in-Dob-17-181117.jpg (below):

Pleiades-Open-Cluster-M45-image-intensified-eyepiece-10-in-Dob-17-181117.jpg (below):

Window sill images with a difference – -13/11/2017

Normally I restrict my window-sill images to wide-field views, but last night I thought I would try something different. I put on a X2 barlow and had a look at a couple of well-known multiple star sysems.

First, Sigma Orionis (Struve 762) and the nearby Struve 761. This is a classic multiple star view in Orion.

This site (http://oneminuteastronomer.com/812/quintuple-star-orion/) says:

Perhaps the finest multiple star in the sky visible to both northern and southern observers, sigma Orionis is a system of five stars, four of which are visible in a small telescope.  The brightest star of this group is one of the most luminous known and will one day expire, like many stars in Orion, in a spectacular supernova explosion.”

Adding to the scene is Struve 761

Next over to M42, and an attempt to to resolve the stars of the embedded “Trapezium”. The Trapezium is the inset picture, and the main image is a multiple exposure of its context within the central part of the Great Orion Nebula.,

More Deep Sky Fun from the Window-sill

Last night, I set up the window-sill equatorial with a bit more care and tried for the Flame / Horsehead again. Results were mixed, but an improvement methinks! All the images below were with the ST80 and a focal reducer. This is not an ideal optical arrangement with an f/5 instrument, but you do get a fast lens

While in the vicinity, I had a look at the RunningMan / M43 / M42 combination. This one is a composite of 4 exposures to avoid washing out the centre of M42, and to try to bring out some features of the “Running Man”.

 

Then on to M78.

Finally across to Monoceros and the Rosette. This is a 2-image composite due to the large size of the Rosette.

 

I think I am now pushing the limits of what can be done with a cheap 80mm refractor through double glazing!