Archives for October 2021

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Baader modified Canon 600Da, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 36x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight

Lensed Sky Quality Meter: 18.3

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

M8, the Lagoon Nebula, is a large bright emission nebula in Sagittarius. It is an easy binocular object and just keeps getting better with larger telescopes. Visually it does look like a lagoon, but photographically it blossoms out into a beautiful red rose. The color comes from diffuse interstellar hydrogen set aglow by stars embedded within it.

This is one of a series of images that I have been taking to explore using relatively simple equipment and techniques. Diffuse objects like this emission nebula are proving to be a bit of a challenge, but still rewarding.

M8 is currently low in the southwest at sunset.

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Baader modified Canon 600Da, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 28x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight

Lensed Sky Quality Meter: 18.3

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

M55 is a large, relatively sparse, class 11 globular cluster in Sagittarius. Its low surface brightness and far southern declination makes it something of a challenge in small telescopes from mid northern latitudes, but it lies to the east of the Milky Way which helps to improve the contrast with the background sky. In a large telescope it blossoms into a soft patch of stardust.

This is one of a series of images that I have been taking to explore using relatively simple equipment and techniques. This is a nice example of going after a relatively challenging target under challenging conditions.

M55 is currently low in the south at sunset.

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Baader modified Canon 600D, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 34x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight

Lensed Sky Quality Meter: 18.3

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

M28 is a bright, condensed globular that reminds me a bit of M80 in Scorpius, and like M80 is has a flashy neighbor (nearby M22) that can draw your attention. Looking at my notes this is only the second time that I have imaged this object. M28 is a wonderful patch of stardust against the rich star fields of the galactic center and makes a fine target for small telescopes.

This is one of a series of images that I have been taking to explore using relatively simple equipment and techniques. This is a nice example of using these techniques to capture quick’n easy patrol images of potential targets for later follow-up with more detailed imaging or for visual observing.

M28 is currently in the southwest at sunset.

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Baader modified Canon 600D, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 38x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight

Lensed Sky Quality Meter: 18.3

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

M16 is actually the cluster in the upper right section of the nebula. The nebula is very subtle and can be difficult to see visually, though it shows well under dark skies. The name, the Eagle Nebula, comes from the dark lanes in the middle which resembles an eagle grasping a fish. These dust lanes are also the famous ‘pillars of creation’ imaged by the Hubble Space Telescope. The nebula is a beautiful expanse of interstellar hydrogen set aglow from young stars embedded within it. M16 lies in the Sagittarius-Carina arm of the Milky Way, the next arm inwards from ours towards the core of our galaxy, so you are looking across the gap between adjacent spiral arms.

This is one of a series of images that I have been taking to explore using relatively simple equipment and techniques. This is a nice example of going after a relatively challenging target under challenging conditions.

M16 is currently in the southwest at sunset.

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Baader modified Canon 600Da, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 30x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight

Lensed Sky Quality Meter: 18.1

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

M103 is one of several open clusters in Cassiopeia. It is small, rather sparse, and was once thought to be an asterism rather than a true cluster, but it has since been shown to be a distant open cluster. Located just 1.5 degrees northeast of delta Cassiopeia it is easy to find and makes a nice target for small telescopes.

This is one of a series of images that I have been taking to explore using relatively simple equipment and techniques. The region of the sky near the celestial pole can get a bit interesting with an altaz mount with sizable movement in both axis and a considerable amount of field rotation, but the overall results are very similar to what I have been getting with less challenging areas of the sky.

M103 is currently well placed in the northeast at sunset.

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Baader modified Canon 600Da, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 39x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight

Lensed Sky Quality Meter: 18.1

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

NGC7789 is a large and wonderfully rich open cluster located just west of Cassiopeia. It was discovered by Caroline Herschel in 1782 and is sometimes called Caroline’s Rose. It is a delicate object in small to moderate scopes, but blossoms into a rich field in large telescopes. When viewing this cluster I like to spend some time with the field. At first all I will see are the foreground stars and perhaps a soft glow in the background. As my eye adjusts, the first faint stars appear, and then it slowly blooms into a beautiful patch of stardust.

Caroline’s Rose is currently well placed in the northeast at sunset.

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Baader modified Canon 600Da, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 34x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight

Lensed Sky Quality Meter: 17.5

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

M14 is a relatively large globular cluster, though it is rather faint. The reddish color gives a clue – it lies in the plane of the Milky Way where there is a fair amount of dust between us and the cluster giving it a beautiful amber hue similar to M22.

This is part of a series of images that I am taking to explore deepsky imaging using fairly basic equipment and techniques. A nice feature of this approach is that it is so simple and easy that you can cover a lot of ground and at the very least use these images to survey potential targets for more in-depth imaging. Looking at my records I found that I have imaged M14 only once before, somehow over-looking this wonderful cluster.

M14 is currently in the southwest as the sky darkens.

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Baader modified Canon 600Da, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 27x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight

Lensed Sky Quality Meter: 17.5

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

M17 is a stellar nursery lying about 6,000 light years away along the southern Milky Way in the Sagittarius-Carina arm of our galaxy. The soft red glow of this beautiful emission nebula comes from young stars embedded within the nebula setting the surrounding interstellar hydrogen aglow. M17 is one of the brightest emission nebula is the sky and is visible in small telescopes under dark skies. Even under urban skies the bright inner region of the nebula is a fairly easy target.

This is part of a series of images that I am taking to explore deepsky imaging using fairly basic equipment and techniques and my first example of imaging a nebula with this approach. I was very happy with the result and the field even shows some of the faint outer veil under relatively challenging imaging conditions.

M17 is currently well placed in the south as the sky darkens. (Photo credit: John Graham, 9/17/2021)

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Baader modified Canon 600Da, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 36x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight

Lensed Sky Quality Meter: 17.5

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

M22 is a large, bright, class 7 globular cluster in Sagittarius and is one of the gems of the summer sky in the northern hemisphere. With an estimated distance of 10,600 light years it is one of the closer globulars in our galaxy. In many ways M22 should outshine M13, but it can get a bit lost among the stars along the Milky Way near the Sagittarius star clouds and its light is dimmed by dust along the galactic plane. Still, it is large, bright, and easily resolves into this beautiful glow of stardust even in a modest telescope. In a large telescope it blossoms into a glorious sight.

This is part of a series of images that I am taking to explore deepsky imaging using fairly basic equipment and techniques.

M22 is currently well placed in the south as the sky darkens.

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode

Camera: Stock Canon 600D, interval timer

Filter: GSO IR Blocking Filter

Guide scope: None

Exposure: 29x10sec, ISO 1600, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/25sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency

Lensed Sky Quality Meter: 18.2

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Deep Sky Stacker, Nebulosity, Photoshop

M2 is a big, beautiful globular cluster that is well placed in the eastern sky in late summer and early fall. It is an easy target for a small telescope. Under dark skies it can even be glimpsed without a telescope or even binoculars. M2 is about 37,500 light years away and lies beyond the galactic center. Like most globular clusters M2 is an ancient relic of the early universe with an estimated age of about 13 billion years.

This is part of a series of images that I am taking to explore deepsky imaging using fairly basic equipment and techniques and this is the fourth and last image taken on my first night out with my LX65.

M2 is currently well placed in the east as the sky darkens.