November 2018

This month, five section members sent in a total of twenty digital images and two sketches.

Steve Norrie used a Celestron C9.25 SCT and StarlightXpress Trius 694 camera plus red, green and blue filters (and narrow band filters for the Hubble palette) to produce twelve deep sky images.

In the constellation of Perseus Steve imaged parts of the the Heart emission nebula:  the first image is a close up of Melotte 15, the open cluster at the core of the nebulosity.

Melotte 15

It is the young, massive stars in Melotte 15, some of almost 50 solar masses, which provide the intense ultra violet radiation responsible for ionising the nebula.

NGC 896

NGC 896 lies at the western edge of the heart nebula.  It is the brightest part and was the first to be discovered.

Steve also imaged emission nebulae IC 5146 the Cocoon nebula, Sh2 – 101 the Tulip nebula and Sh2 – 112;  all in Cygnus:

IC 5146
Sh2 – 101
Sh2 – 112

Below are another two emission nebulae: a  part of NGC 2244 the Rosette nebula in Monoceros and Sh2 – 155 the Cave nebula in Cepheus.

NGC 2244
Sh2 – 155

The remaining five images are all galaxies:  NGC 7331 in Pegasus, NGC 891 in Andromeda, NGC 6946 on the Cepheus/Cygnus border, NGC 925 in Triangulum and M74 in Pisces:

NGC 7331
NGC 891
NGC 6946
NGC 925
M74

 

Michael Kinns used a 200mm Orion Optics f6 Newtonian reflector  to sketch two open clusters, NGC 752 in the constellation of Andromeda and M34 in Perseus:

NGC 752
M34

M34 has an apparent magnitude of 5.5, so should be a binocular target under reasonable conditions and even a naked eye object from a dark sky site.  It is reckoned to be around 200 million years old, about 7.5 light years across and 1,500 light years from the Earth.

 

Paul Brierley imaged emission nebula IC 5146, the Cocoon nebula, in the constellation of Cygnus with an Altair Wave 115 EDT refractor and an Atik 428 Ex mono camera:

IC 5146

IC 5146 is around 4,000 light years from the Earth, so the 12 arcminute diameter equates to about 15 light years.  The dark nebula associated with the emission nebulosity is designated Barnard 168.

 

David Davies imaged open cluster NGC 188, also known as Caldwell 1, in the constellation of Cepheus, using an APM 107mm refractor and QSI 583 mono camera plus red, green and blue filters.

NGC 188

NGC 188 lies well above the the milky way galactic plane, away from its greatest gravitational influence;  which explains why, at about 7 billion years old, it hasn’t dispersed.   It is about 5,000 light years from the Earth.

 

Mark Beveridge sent in six digital images.  The first three are galaxies which lie in the constellation of Pegasus:  NGC 7217, NGC 1530 and NGC 7318 (Stephan’s Quintet).

NGC 7217
NGC 1530
NGC 7318

Stephan’s Quintet is made up of NGC 7318A and B (a pair of colliding galaxies), NGC 7319, NGC 7320,  and NGC7317.  Four of the five (aka Hickson Compact group 92) are physically associated and considered likely to merge over time.

 

The next two galaxy images are NGC 7242 in Lacerta and NGC 925 in Triangulum:

NGC 7242

NGC 7242 is a member of a group of galaxies designated WBL 679.  A number of the fainter galaxies have been captured in this image.

NGC 925

Mark’s sixth image is 0f emission nebula NGC 7380, the Wizard nebula, in Cepheus:

NGC 7380

 

Dave Finnigan