November 21, 2024

Archives for July 2022

NGC 5694 – Globular Cluster in Hydra

NGC 5694 – Globular Cluster in Hydra

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: Full Spectrum Modified Nikon D810, Baader Mk III MPCC

Filter: GSO IR Blocking Filter

Guide scope: Astro-Tech 60mm, ZWO ASI120MM mini, PHD2

Exposure: 11x120sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/2sec, Tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.0

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Photoshop

NGC 5694 is a tiny globular cluster on the border between Hydra and Libra and it never gets very high above the southern horizon from mid northern latitudes. This little globular is an interesting target for a couple of reasons. First, it is quite distant; 113,000 light years from the sun and 95,000 light years from the galactic center. Second, it is traveling and an amazing speed; 170 miles/second relative to the galactic core. At this speed the cluster is not gravitationally bound to the Milky Way and is on a hyperbolic path that will take it out into intergalactic space. Also, the chemical composition of its stars suggest that it did not originate in the galactic halo, marking NGC 5694 as an intergalactic wanderer making its one and only pass through the Milky Way.

NGC 5694 is currently low in the southwest at dusk.

NGC 7635 – The Bubble Nebula in Cassiopeia

NGC 7635 – The Bubble Nebula in Cassiopeia

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: QHY 367c Pro, 0C, Baader Mk III MPCC

Filter: GSO IR Blocking Filter

Guide scope: Astro-Tech 60mm, ZWO ASI120MM mini, PHD2

Exposure: 33x300sec, gain 2800, offset 50, saved as FITS, dithered every 2 images

Darks: 32, 0C, gain 2800, offset 50, saved as FITS

Flats: 64x500ms, Tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.6

Stacking: Average, 1 sigma clip

White Balance: Nebulosity Automatic

Software: SharpCap Pro, Deep Sky Stacker, Nebulosity, Photoshop

This is NGC 7635 is almost the inverse of a planetary nebula. Planetaries are expanding shells of gas shed from a dying star. The Bubble is formed from the intense radiation a hot blue star pushing out a spherical void in the surrounding gas and setting the hydrogen aglow with a beautiful red color. The Bubble looks like a delicate Christmas ornament on an unimaginable scale.

NGC 7635 rises in the northeast in the early evening and is high overhead at dawn.

M27 – Planetary Nebula in Vulpecula

M27 – Planetary Nebula in Vulpecula

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: QHY 367c Pro, 0C, Baader Mk III MPCC

Filter: GSO IR Blocking Filter

Guide scope: Astro-Tech 60mm, ZWO ASI120MM mini, PHD2

Exposure: 21x300sec, gain 2800, offset 50, saved as FITS, dithered every 2 images

Darks: 32, 0C, gain 2800, offset 50, saved as FITS

Flats: 64x500ms, Tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.6

Stacking: Average, 1 sigma clip

White Balance: Nebulosity Automatic

Software: SharpCap Pro, Deep Sky Stacker, Nebulosity, Photoshop

M27, the Dumbbell nebula, is an expanding shell of gas that was ejected from a sun-like star as it exhausted its hydrogen fuel. Swollen into a red giant, the star shed its outer shell while its core collapsed into a white dwarf. Fierce UV radiation from the collapsed core sets the surrounds gas aglow with the blue/green light of doubly ionized oxygen. The diameter of the nebula is about 1 light-year with an estimated age of 9,800 years. Located between Sagitta and Cygnus, M27 is fairly easy to find with a small telescope. Visually, it shows two lobes connected by a neck of nebulosity, giving the nebula its characteristic dumbbell shape.

It took a couple of nights to get this new camera settled in, but I think that I’m close. There’s a little bit of tweaking to do yet, bit I’m starting to get the results that I was hoping for.

M27 is currently well placed in the northeast in the early evening and is high in the south after midnight.

M56 – Globular Cluster in Lyra

M56 – Globular Cluster in Lyra

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: Full Spectrum Modified Nikon D810, Baader Mk III MPCC

Filter: GSO IR Blocking Filter

Guide scope: Astro-Tech 60mm, ZWO ASI120MM mini, PHD2

Exposure: 26x120sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/20sec, Tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.7

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Photoshop

M56 is a relatively small, dense globular cluster that tends to get a bit lost against the background Milky Way. I have always found this to be a somewhat challenging object as seen from my backyard, but it blossoms beautifully with a camera.

M56 is currently placed high in the northeast at dusk. (Photo credit: John Graham, 530-2022)

M62 – Globular Cluster in Ophiuchus

M62 – Globular Cluster in Ophiuchus

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: Full Spectrum Modified Nikon D810, Baader Mk III MPCC

Filter: GSO IR Blocking Filter

Guide scope: Astro-Tech 60mm, ZWO ASI120MM mini, PHD2

Exposure: 43x60sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/20sec, Tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.1

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Photoshop

M62 is one of several small globular clusters that are well placed for observing during the early evening hours this time of year. M62 appears small in part due to its great distance; 25,000 light years from Earth and 5,500 light years from the galactic core. It is actually one of the larger clusters in the Milky Way with an estimated mass of 1.2 million suns. Visually, M62 appears a bit lop-sided with the core shifted off-center to the east giving it a comet-like appearance. This may be a result of the cluster’s close proximity to the galactic core.

M62 is currently placed low in the south at dusk.

M5 – Globular Cluster in Serpens

M5 – Globular Cluster in Serpens

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: Full Spectrum Modified Nikon D810, Baader Mk III MPCC

Filter: GSO IR Blocking Filter

Guide scope: Astro-Tech 60mm, ZWO ASI120MM mini, PHD2

Exposure: 50x60sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/20sec, Tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.4

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Photoshop

Like many globular clusters M5 is a relic of the early universe with an estimated age of 13 billion years. It is also one of the largest known globular clusters home to as many as 500,000 stars in a region 165 light years across. Its large size has been a major factor in its longevity. Globulars near the galactic plane slowly disperse as they lose stars to the Milky Way. However, M5 is so large that it has been able to hold on to most of its stars. At magnitude 5.7 M5 is an excellent target for small telescopes.

M5 is currently well placed high in the south at dusk. (Photo credit: John Graham, 530-2022)

M9 – Globular Cluster in Ophiuchus

M9 – Globular Cluster in Ophiuchus – RC8 QHY 367c Pro First Light

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: QHY 367c Pro, Baader Mk III MPCC

Filter: GSO IR Blocking Filter

Guide scope: Astro-Tech 60mm, ASI120MM mini, PHD2

Exposure: 17x180sec, gain 2000, offset 50, 0C, saved as FITS

Darks: 32×180sec, gain 2000, offset 50, 0C, saved as FITS

Flats: 64×0.5sec, Tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 17.2

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: SharpCap Pro, Deep Sky Stacker, Nebulosity, Photoshop

M9 is a relatively bright modestly condensed (Class 8) globular cluster located 3 degrees to the southeast of Sabik in Ophiuchus. It is relatively close to the galactic core being about 5,500 light years from the galactic core and 26,000 light years from Earth. It is interesting to note the dark lane cutting across the lower right corner of this field as compared to the star rich field to the upper left indicating a swath of dust along the Milky Way blocking the light from the distant star fields beyond.

This was the first test image taken with my new to me QHY 367C Pro full-frame camera. This camera uses the same sensor as my full spectrum modified Nikon D810 and it will be interesting to compare the two. As it turns out this image was taken at a relatively low gain. I used a fairly conservative gain of 2000 for this image as compared to the unity gain for the 367 of 2800that I used here. It has also been a long time since I previously used SharpCap Pro for deepsky imaging. I have a few adjustments to make as I get familiar with this new camera, but this is a good start, particularly given the poor sky conditions and bright moonlight.

M9 is currently well placed in the southeast at sunset.

Waxing Gibbous Moon – 7/9/2022, 9:00pm EDT

Waxing Gibbous Moon – 7/9/2022, 9:00pm EDT

Telescope: Astro-Tech RC8 @ f/8, Orion Atlas EQ-G

Camera: QHY 367c Pro, Baader Mk III MPCC

Filter: GSO IR Blocking Filter

Exposure: 64x15ms, gain 2000, offset 50, 0C, saved as FITS

Seeing: fair, 3/5

White Balance: Nebulosity Automatic

Software: SharpCap Pro, Nebulosity, Registax, Photoshop

This is the first-light image taken with my new to me QHY 367c Pro full-frame camera. As sunset approached I used the moon to provide a rough alignment for the mount, slewed to Vega to set the focus, and then back to the moon to take this image set. Off to a great start!