NGC891 and Friends

NGC891 (also known as Caldwell 23) is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda. It was discovered by William Herschel on October 6, 1784. The galaxy is a member of the NGC1023 group of galaxies in the Local Supercluster. NGC891 looks as the Milky Way would look like when viewed edge-on and in fact both galaxies are considered very similar in terms of luminosity and size. This picture is a widefield view and clearly shows some of the members of AGC347.

NGC891 and friends

Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 13 hours (92x300s L + 3x20x300s RGB)
Date: October 2017
Location: Southern Alps, France

 

Edit: Here’s a link to the inverted image with annotations of the PGC catalogue

Wacka Wacka Wacka…

Wacka Wacka Wacka…. or shall we say NGC281, also known as the Pacman nebula. NGC 281, IC 11 or Sh2-184 is a bright emission nebula, part of an H II region in the northern constellation of Cassiopeia and is part of the Milky Way’s Perseus Spiral Arm. It lies 9200 ly. from us. There are many pictures available of the bright red emission area. I aimed for a big integration time of over 20 hours to make the surrounding very faint brown molecular clouds visible. The image is a combination of Ha-O3 narrowband and LRGB.

NGC281

Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 21 hours (60x300s Ha + 40x300s O3 + 70x300s L + 3x30x300s RGB)
Date: September & October 2017
Location: Southern Alps, France

NGC1333 – a Stellar Nursery in Perseus

There’s a lot of activity going on in this picture. One of the very youngest molecular clouds in the constellation of Perseus is NGC 1333. This beautiful nebula contains hundreds of stars that are as young as a million years old, and is one of the nearest star forming regions to us, at a distance of 1000 ly. Some of these protostars create outflows that collide with the surrounding medium to create Herbig-Haro objects. Many of them can be seen in the bright red emission regions within NGC1333. The blue nebulae in this image are areas of dust that are reflecting the light from the hot blue stars in front of the dust. Additionally, this image shows several dark nebulae where the dust obscures the light behind it, giving the stars their distinctive orange-brown color.

NGC1333

Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 13 hours (85x300s L + 3x24x300s RGB)
Date: September 2017
Location: Southern Alps, France

Sh2-187 and LDN1317

The area in Cassiopeia contains a lot of well-known and lesser-known emission nebulae and dark dust lanes. One of the objects, not far from the star Ruchbah is Sh2-187 and the surrounding dust of LDN1317. I think it is a neat little gem that is often overlooked and so I’m happy that I was able to capture it during the past weeks. This little star nursery lies about 4700 ly away from us.

Sh2-187 and LDN1317

Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 15 hours (110x300s L + 3x24x300s RGB)
Date: July & September 2017
Location: Southern Alps, France

 

 

CTB1, a very faint supernova remnant in Cassiopeia

My latest addition is this picture of an object which has not been photographed that often, probably because it has a very low surface brightness. CTB1 is a nearby supernova remnant in the constellation of Cassiopeia with an apparent diameter of about a half a degree. Upon early discovery, CTB1 was thought to be a planetary nebula, so Abell included it in his catalog of planetary nebulae as Abell 85. Further research showed that CTB1 is in fact a supernova remnant. Distance and age estimates are 10,000 light years, and 7,500 – 11,000 years, respectively. It spans nearly 100 light years.
As the object is very faint, it requires a lot of exposure time. Main portion was spent on Ha and O3, with a smaller amount of RGB for the stars.

CTB1 (Abell85)

Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 35.5 hours (156x300s Ha + 161x300s O3 + 3x30x300s RGB)
Date: August 2017
Location: Southern Alps, France

The Total Solar Eclipse, August 21st 2017 – Idaho, USA

This is an overview of the pictures I took during the total solar eclipse in St Anthony, Idaho, USA, on August 21st 2017. The conditions were close to excellent. No clouds, dry air and fairly good seeing.
We picked a spot not too far from the center line from where the duration of the total eclipse was 2’00”. Far away from the cheering crowds we could experience the eclipse in the middle of the Idaho plains. It was a truly unforgettable experience.
The top half of the picture shows some different stages of the moon covering the sun. The three middle pictures show the moment of (close to) totality.
The bottom half of the picture is an HDR composition with shutter speeds ranging from 1/4000s to 2s, showing the red solar flames, the solar corona and some ‘earth shine’ (sunlight reflected by the earth and shining on the dark side of the new moon)


Sh2-155 – the Cave Nebula

Sh2-155 (also designated Sharpless 155 or S155) is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula. Sh2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 2400 light-years from Earth. Sh2-155 lies at the edge of the Cepheus B cloud (part of the Cepheus molecular cloud), and is ionized by young stars from the Cep OB3 association. It has been suggested that radiation from the hot O-type star HD 217086 is compressing the region, triggering the formation of a new generation of stars. A study of the region’s young stellar objects by the Chandra X-ray Observatory and Spitzer Space Telescope shows a progression of stellar ages in front of the cloud, supporting the hypothesis of triggered star-formation!

Sh2-155, the Cave Nebula

Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 185x5min LHaRGB (Ha blended with RGB)
Date: June – July 2017
Location: Southern Alps, France

 

VdB141 or the Ghost nebula

The Ghost Nebula (designated Sh2-136 and VdB 141) is a reflection nebula located in the constellation Cepheus. It lies near the cluster NGC 7023. Looking at the image, especially the cut-out, the nebula’s name is easily understood. The Ghost nebula is referred to as a globule and over 2 light-years across. There are several stars embedded, whose emissions make the nebula shine in brownish colour.

VdB141, Ghost nebula

Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 146x5min LRGB
Date: June – July 2017
Location: Southern Alps, France

 

Cut-out of VdB141

 

 

Nebulas galore

The first picture is LDN1235, a dark molecular cloud in the constellation of Cepheus. Also visible are the bright blue reflection nebulae VdB149&150.
The second picture is a bi-color narrowband image in Ha and O3 of the hydrogen rich area in Cygnus. Top right is NGC6888 or Crescent nebula at a distance of 5000ly. Middle left is the very faint PN G75.5+1.7 or Soap Bubble nebula, discovered only very recently by an amateur astronomer in 2008 (not me  )

LDN1235

Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 148x5min LRGB
Date: June – July 2017
Location: Southern Alps, France

NGC6888 and PN G75.5+1.7

Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 126x5min Ha(R) + O3(B) + synth G
Date: June – July 2017
Location: Southern Alps, France