Telescope: ES Comet Hunter MN6 at f/4.8, Orion Atlas EQ-G

Camera: Baader modified Nikon 610

Filter: High Point 2” IR Blocking Filter

Guide scope: Williams Optics 50mm, ASI290MM mini, PHD

Exposure: 28x120sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/4sec, tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.3 mag/arc-sec^2

Stacking: Mean with a 2-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Deep Sky Stacker, Photoshop

If you look closely galaxies are sprinkled across this field located just north of the beautiful binary star Algieba in Leo. At the center of this image is four galaxies that comprise the Hickson 44 Compact Galaxy Group. From left to right these NGC 3193, NGC 3190, NGC 3187, and NGC 8185. Of these NGC 3193 is an elliptical and the others are spirals. NGC 3187 is a barred spiral with a highly warped disk. Paul Hickson cataloged 100 compact galaxy groups, most of which form interacting groups with local concentrations of dark matter.

The Hickson 44 compact galaxy group is currently well placed high in the east as the sky darkens.

Telescope: ES Comet Hunter MN6 at f/4.8, Orion Atlas EQ-G

Camera: Baader modified Nikon 610

Filter: High Point 2” IR Blocking Filter

Guide scope: Williams Optics 50mm, ASI290MM mini, PHD

Exposure: 19x60sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/4sec, tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.1 mag/arc-sec^2

Stacking: Mean with a 2-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Deep Sky Stacker, Photoshop

M10 is one of several bright, beautiful globular clusters in Ophiuchus. Although superficially globulars appear similar, they each have their own distinct character. The globulars that populate the summer sky are a great opportunity to visit several in one night to see for yourself how different they are.

M10 rises in the east late in the evening and is high in the south in the early morning. (Photo credit; John Graham, 3/20/2021)

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

Camera: Baader modified Nikon D610, Baader Mk III MPCC

Filter: Highpoint Scientific IR Filter

Guide scope: Astro-Tech 60mm, Starlight Xpress Super Star, PHD2

Exposure: 32x120sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/10sec, Tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 17.7 mag/arc-sec^2

Stacking: Mean with a 2-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Deep Sky Stacker, Photoshop

This was the first of three first-light images taken to test the performance of the full-frame Nikon D610a on the RC8 and with the Baader Mk III MPCC. This proved to be an excellent match with good star shapes across the field and only a bit of vignetting in the corners that were handled pretty well with flats. This is going to be a wonderful mid-field imaging system.

M3 is a beautiful example of a globular cluster in a relatively lonely stretch of sky. The cluster is a member of the galactic halo and spends much of its time orbiting well outside the plane of the galaxy. It is presently 33,000 light years away from us, 40,000 light years from the galactic core, and 33,000 light years ‘above’ the galactic plane. Home to about 500,000 stars, M3 is relatively young as globular clusters go with an estimated age of 8 billion years.

M3 is currently well placed in the northeast as the sky darkens.

Telescope: Meade SN10 at f/4, Orion Atlas EQ-G

Camera: QHY 168c, -10: Deepsky Default; Gain: 4, Offset 30

Filter: GSO IR Blocking

Guide scope: Williams Optics 50mm, ASI290MM Mini, PHD2

Exposure: 29x240sec saved as FITS

Darks: 32x240sec saved as FITS

Flats: 32×0.20sec, LED tracing tablet w/ 3 layers of muslin

Average Light Pollution: Red zone, poor transparency

Lensed Sky Quality Meter: 18.4 mag/arc-sec^2

Stacking: Mean with a 2-sigma clip.

White Balance: Nebulosity Automatic

Software: Nebulosity, Deep Sky Stacker, Photoshop

M88 (right) and M91 (left) are a relatively bright spiral galaxies in Virgo. M88 shows a classic spiral structure while M91 is a beautiful barred spiral. If you closely there are several galaxies scattered across this field. For example, NGC 4516 (Mv 13.5) lies to the upper left of M88, and tiny PGC 41978 (Mv 15.2) is to the lower left of M91. To the lower left of M88 is IC 3478 (Mv 14.4) and IC 3476 (Mv 12.8).

The Virgo Galaxy Cluster is currently well placed in the evening sky low in the east after sunset and rising high overhead by midnight.

Telescope: ES Comet Hunter MN6 at f/4.8, Orion Atlas EQ-G

Camera: Baader modified Nikon 610

Filter: High Point 2” IR Blocking Filter

Guide scope: Williams Optics 50mm, ASI290MM mini, PHD

Exposure: 48x60sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/4sec, tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.0 mag/arc-sec^2

Stacking: Mean with a 2-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Deep Sky Stacker, Photoshop

This is a nice example of the wide field offered by the Comet Hunter and the full-frame D610a showing Antares to the left, NGC6144 to the upper right of Antares, M4 on the right, and delta Scorpius (Alniyat) in the upper right corner. Antares is a red super giant with a diameter about 400 times that of the sun. If it were placed at the center of our solar system its surface would extend out beyond the orbit of Mars. M4 is one of the closest globular clusters lying only 7,200 light years away in the general direction of the galactic core. It appears reddish-brown due to dust along the galactic plane. Being so close M4 can be resolved into individual stars in a relatively small telescope. NGC 6144 is somewhat sparse and much farther away at an estimated distance of about 28,000 light years.

Antares and M4 are currently morning objects rising low in the southeast after midnight and transiting in the south shortly after 4am.

Telescope: ES Comet Hunter MN6 at f/4.8, Orion Atlas EQ-G

Camera: Baader modified Nikon 610

Filter: High Point 2” IR Blocking Filter

Guide scope: Williams Optics 50mm, ASI290MM mini, PHD

Exposure: 31x120sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/4sec, tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.3 mag/arc-sec^2

Stacking: Mean with a 2-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Deep Sky Stacker, Photoshop

This wide field image taken near the center of the Virgo Galaxy Cluster includes M89 near the center of this field, M58 to the lower left, M90 to the upper left, and M87 (Virgo A) to the right. Below M89 is a nice pair of galaxies; NGC 4551 (upper left) and 4550 (lower right).

The Virgo Galaxy Cluster is currently well placed in the evening sky low in the east after sunset and rising high overhead by midnight.

Telescope: ES Comet Hunter MN6 at f/4.8, Orion Atlas EQ-G

Camera: Baader modified Nikon 610

Filter: High Point 2” IR Blocking Filter

Guide scope: Williams Optics 50mm, ASI290MM mini, PHD

Exposure: 23x60sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/4sec, tee shirt flats taken at dusk

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

Lensed Sky Quality Meter: 18.0 mag/arc-sec^2

Stacking: Mean with a 2-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Deep Sky Stacker, Photoshop

M48 is a rich open cluster located in western Hydra near the border with Monoceros in a relatively open stretch of sky on the fringe of the Milky Way. A fine object in binoculars or small telescope it may even be glimpsed without an optical aid under dark skies. This is another fine example of the wide field offered by the combination of the DHL Comet Hunter and a full-frame DSLR.

M48 is currently well placed in the evening sky high in the south after sunset.