Sky Watcher HEQ5 Pro Mount

The Bubble Nebula and M52

Had this data a while but not the chance to process. I got the RGB and Ha data on 22nd November and then the Sii and Oiii a couple of nights later. I left the Oiii and Sii running overnight, but had to drop a lot of frames due to cloud. The RGB and Ha was the data I used for the HaRGB demo to the RAG AP group on Friday, but I’ve only just had the chance to add the Oiii and Sii.

Kit was 130pds on HEQ5, with ZWO ASI1600mm to capture

Capture details are:
20x 30 sec each of RGB
90x 1min Ha
50x 2min Oiii
55x 2min Sii

Presentations are Ha, HaRGB and SHO with RGB Stars.

Spring 2020 Lockdown Astro Bonanza

It’s feast or famine in this hobby, isn’t it?

Back in November I was feeling so starved of night sky I was starting to check out remote telescope subscriptions. Fast forward 4 months and the clear nights have been a regular and very welcome occurrence in these strange times. In the month between 15th March – 15th April I’ve been able to observe and/or image on 11 different nights helped not a little by working all the time at home.

I’ve still got quite a lot of data to go through but thought I’d share a few of the pictures I’ve managed during this time. Feedback always welcome…

M106 – 15th March

ASI1600MM / SW200p / HEQ5 – 20x 2 mins in each of RGB

Really pleased with how this one came out- but really wish I’d framed it better to move NGC4217, bottom right, further into the frame as I hadn’t realised it would be so photogenic.

Leo Triplet – 22nd March

ASI1600MM / SW200p / HEQ5 – 48x 120s L, 20x 2 mins in each of RGB

M63 Sunflower Galaxy 25th March

ASI1600MM / SW200p / HEQ5 – 40x 60s L, 10x 2 mins in each of RGB

Seven Sisters and California 25th March

Canon 600d / Jupiter 135mm / Star Adventurer – 45x 1min exposure per pane.

Really pleased to have got this one. I only realised it was a composition that would work with the 135mm whilst doing a much wider shot- and it would have been better had I done it a few months earlier. As it was I managed 45 minutes on each pane before they slipped below the horizon- indeed there was a bit of incursion from the Leylandii dark nebula at the bottom of my garden on the last few subs. The gradients were pretty fierce as well- to the extent that the Pixinsight tools really couldn’t do much and I resorted to eyeballing the brightness and joining the pictures up in Gimp- hopefully I got away with it! I’ll definitely have another go at this later this year when they’ll be much higher in the sky.

M3 Globular 26th March

ASI1600MM / SW200p / HEQ5 – 10x 2mins in each of RGB

I do love globs, especially the way they start to look different from each other once you get to know them. M3 always looks much tidier than M13 in the eyepiece to me, but that’s less apparent in pictures. What stood out for me on this one is the contrast between white and orange stars. Definitely have to look for that in the eyepiece next time.

M101 Pinwheel Galaxy 26th/27th March

ASI1600MM / SW200p / HEQ5 – 146x 1min L, 15 x 2 mins each of  RGB, 58x 2 mins Ha

I really went to town a bit on this one to see how much gathering extra data would help the image. Adding the Ha in took quite a bit of tweaking- the process I usually use for nebulae pictures (learned from Light Vortex tutorials for Pixinsight) really didn’t give me very much so I spent a long time playing with it. In the end the most effective way was to combine the Ha with the Red prior to colour combining, then after the stretch and applying luminance, use the Ha layer as a mask and enhance the saturation on the red that way.

Virgo Galaxy Cluster 27th March

Canon 600d / Jupiter 135mm / Star Adventurer, 123x 1min

This didn’t come out as the most exciting image in the world- you have to look quite hard to spot the galaxies, so I ran it through the Pixinsight script that annotates your photos to make a GIF of it. There are quite a few!!

Owl Nebula 6th and 8th April

ASI1600MM / SW200p / HEQ5 – 8×5 mins in each of Ha, Oiii and Sii

These were done under a bright moon- the first is a Bi-colour HOO from the first night’s captures and the second is SHO after I’d captured some Sii. I think I prefer the HOO version- the Sii signal was very weak and I don’t think it really adds anything to the images.



Forum threads on 45 degree offset error on HEQ5 mount during alignment

I have found these two forum threads on the 45 degree offset error during alignment of the HEQ5 Pro mount, similar to my experience with my own mount over the last couple weeks. Not sure whether they give me a solution though!


Forum threads on warning 45 degree offset error on HEQ5 accessed 181019 (PDF file – this file there are two forum threads – scroll through the pages to see the two threads)

mobile base for EQ6/HEQ5 completed

At last! My mobile base for my EQ6 is completed. Someone will note slightly extended legs and wonder why…..answer is that base is designed to take either EQ6 as is currently on it or HEQ5- and the tripod on HEQ5 (same as EQ5 tripod but different from EQ6 tripod) has long legs and wider spread than EQ6 tripod.


Filtering the Crescent

Over the last couple of weeks I’ve been imaging the Crescent using different focal lengths and filters

Widefield 135mm

I was working out that this is the fourth time I’ve been imaging in or around the Sadr nebula. On this occasion it was because I’d already started on the data for 900mm shots of the Crescent and I thought it’d be nice to have a wider shot of the general area, putting it into context. I was inspired by Neil’s recent results with his Triband filter to see if the same (or similar) technology in a clip filter would help with wide frame nebula images and acquired a Skytech Quadband (that transmits 2 35nm bands around Ha, Hb, Oiii and Sii – hence the name) . I must say I’m quite impressed- I got this from a sequence of 20x 150 second captures on Sunday night under a 99% moon using the Russian made 135mm vintage lens I’ve posted about previously. Normally I’d only attempt proper Narrowband under these sorts of conditions, but I thought it coped pretty well under the strong moonlight. The only slight concern is the halo around Sadr itself.

The photo picks out how prominent the Crescent is (below and to the right in this picture), but also shows how “busy” this bit of sky is- the Butterfly nebula pops out, with its prominent dark lane, but the fainter cloud that it’s a part of extends beyond the frame. There are also clusters aplenty- my favourite is M29 – the Space Invader cluster just below and to the left of the centre. Probably my eighties upbringing…

Hydrogen Alpha

These are taken using a Baader 7nm Ha Filter on a modded Canon 550d in a Skywatcher 200p- altogether I got 12 10 minute subs before clouds stopped me. I think this is the best of the shots for showing the structure of the object and the shockwaves that form its shape; the monochrome also highlights the cloud of the larger surrounding nebula.


This came from the same setup and 10 more subs, this time with an 8.5nm Oiii filter, and a 99% moon on 13th October. The only Oiii visible in this shot is around the nebula itself. The signal was quite a bit weaker than the Ha; this picture was created by discarding the Red Channel and then combining equally the Blue and Green using Pixelmath in Pixinsight.


Finally, it’s all brought together using the same process- this time feeding the Hydrogen into the Red channel and the Oxygen into the Blue and Green. I spent quite a bit of time playing with this one. Just feeding the data in, the red was total dominant and I progressively multiplied the Blue and Green until it was more prominent (the eventual multiplier used was 2). I also experimented with trying to change the balance to bring a little more colour into it, but that also artificially unbalanced the star colour so I decided to leave it even, which makes the Oxygen mostly white when combining with the Hydrogen.

I’ve really enjoyed taking these different views of the same object and learning about it. The nebula itself, 5,000 light years away, is 25 light years across and is caused by fast stellar winds erupting from the Wolf-Rayet star visible at the centre of the nebula. It’s thought the star will imminently (in astronomical terms) become a supernova.

Sky Watcher Equinox Pro 80mm OTA + Tele Vue TRF-2008 field flattener + QHY10 camera & William Optics 66mm OTQ with T7C guide camera + TS OAG/flip mirror on HEQ5 Pro & focus points on both scopes with these cameras 20/9/2019

Sky Watcher Equinox Pro 80mm OTA + Tele Vue TRF-2008 field flattener + QHY10 camera & William Optics 66mm OTQ with T7C guide camera + TS OAG/flip mirror on HEQ5 Pro & focus points on both scopes with these cameras 20/9/2019:


Cygnus Wall – Bi Colour

Over the full moon period we’ve had a couple of clear nights and I’ve taken the chance to get some pictures of the Cygnus Wall in Ha and Oiii. Back in February/March I had an attempt to do this on the Cone nebula but the results were not brilliant (suspect user error is to blame as usual). Here are my results from the same technique on the Cygnus Wall that have come out much better. Possibly part of it is understanding that the Oiii data is considerably weaker than the Hydrogen data and compensating a bit for that.

Anyway- below are the images- they’re 1 hr 20 of Oiii (I took 3 hours but most of them had to be thrown away due to moonlight and cloud) and 2 hr 40 of Ha (only had to reject 2 of these) plus the usual calibration frames.

Firstly – Ha:

Then Oiii (yes, I’m still not great at aiming the camera in the same place on two successive nights, but it’s tricky when you can’t see what it’s taking a picture of!)

Finally- the combination made from feeding the Ha into the Red Channel and the Oiii into the Blue and Green:




Weekend Opportunism

Between a busy work week, family commitments and some so-so forecasts it wasn’t looking good for astronomy this weekend, but it turned out pretty well.

Friday Night:
Didn’t get out until about 10:30 but tried to make up for lost time by setting both the main scope going and trying out my 50mm lens on the Star Adventurer. I had high hopes for the 50mm lens- it’s another oldie (I’ve had it about 15 years), but online quite a few people are getting great results with them. Well- I’m not in that club (yet). The diaphragm only has five blades and although I stopped it down to f2.8 (it’ll open up to f1.8) all of my stars are pentagons and DSS is refusing to recognise them as stars- so no results from that. Fortunately, the main rig saved the day: I went for NGC6946 – The Fireworks Galaxy with my 200p. Throughout the session low clouds were interrupting the view, and around half the subs were lost, but the ones I did hang onto gave the result below. Over the summer I’ve picked up a second hand Canon 550d that has been home modified with a Peltier cooler and put into a metal case- it’s not pretty, but it seems to be effective. This is 13×4 minute subs and throughout this session it held the temperature down to around 7-8 degrees which I’m pleased with (a couple of degrees below ambient, my 600d usually runs about 10 degrees above ambient and is consequently much noisier). The target itself is quite a bit smaller than I’d anticipated- this is a crop of about 20% of the frame. Despite the small size- I think this is a lovely target- both for its colours and the asymmetry in the arms.


Whilst the cameras were doing their stuff I had the Dob out on the following objects:

The Double-Double- I used Vega to get the finders lined up then dropped down to Epsilon Lyra to check out the seeing. It was a straightforward split, but I could see that the transparency was not great.

M13 & M92 – I often start with these and never get tired of them. In Binoviewers at about 260x they fill the field of view and appear 3 dimensional. For me these are the only types of objects that actually look better in the eyepiece than in a photo; I love the difference in their appearance- M13’s great with lots of features, but a bit of a mess with arms everywhere, whereas M92 is compact and very neat. Just wonderful.

The Veil – I was reading a thread on SGL recently which referenced a Sky and Telescope article on The Veil ( . Using this as a guide, and with an Oiii filter a 30mm eyepiece (55x) and a coat over my head I managed to explore just about the whole thing. I’m a bit prone to hopping from object to object whilst observing, so it was great to really take my time in the tranquillity of the small hours and drink it all in with nothing but the odd clunk of a shutter release and that American woman with the nice voice who commentates on APT saying “Dithering started…” softly in the background. Ahhh… a very nice dither contemplating the remnants of a supernova.

I was on the Veil for over half an hour and loved every minute of it, but decided with to move on with the Oiii filter and go check out M27. This is normally not a problem, but by this point the transparency had deteriorated so much I was unable to hop to it. Altair was the only nearby star that was naked eye visible and despite several attempts I just couldn’t find the stars in the finder to hop up to M27. Reluctant to retire I switched up to the North East to check out M31 as the skies looked better in that direction. Before I could get to it a bank of cloud blotted it out. Time for bed…


I managed to pop out briefly whilst doing other things on Saturday evening and set the imaging rig running on M13. This was a bit of an experiment: I’ve imaged M13 before, but with my guide camera on a smaller scope using the short exposure method. Whilst I was quite pleased with those outcomes (see , I wanted to see how it would look with more integration time and a DSLR chip. This is 22x 4 min subs plus calibration frames and I am really pleased with it. As a bonus for the last half-hour it was running I sat outside with Sam observing the sky primarily with Mark 1 eyeballs. After a while we were both able to pick out the Milky Way running up through Cassiopeia and Cygnus despite the local light pollution. A real pleasure!