November 2014

This reporting period began with Michael Kinns sending in two drawings of observations he made using his 200mm f6 Newtonian telescope.

NGC 7142

NGC 7142, and  NGC 7510 are both open clusters in the constellation of Cepheus.  Michael used a magnification of 67x for NGC 7142, which is near to the reflection nebula NGC 7129; studies have shown that the light from the stars in this cluster is reddened, indicating that interstellar matter is partly obscuring it.  Michael noted that “only a few 12th magnitude stars could be resolved among a nebulous background of 13th magnitude stars extending to ~ 9′ in an approximate circle”.

NGC 7510

  NGC 7510 was observed at 150x, and the light from this cluster has also undergone extinction from interstellar gas and dust.  This cluster is in the Perseus spral arm.


Dale Holt sent in drawings of 5 galaxies this month, all observed with a 505mm Newtonian telescope and a Watec120Ncooled video camera.

 Here are sketches of NGC 1 and NGC 2, in the constellation of Pegasus.

NGC 1, NGC 2

  NGC 1 is a magnitude 13.6 spiral galaxy about 190 million light years from the Earth.  NGC 2, also a spiral, is fainter still at magnitude 15, and is considerably further away at around 316 million light years.

NGC 16

 

Here are drawings of NGC 16 and NGC 23, both in the constellation of Pegasus.  NGC 16 is magnitude 13.0, whereas NGC 23 is magnitude 11.9.

NGC 23

 

NGC3432 or Arp 206

Dale’s final sketch this month is NGC 3432, number 206 in the Arp catalogue of so called peculiar galaxies, by Halton Arp, published in 1966. Magnitude 11.7 NGC 3432 is interacting with smaller galaxy UGC 5983, shown in the sketch at

the upper right, which is much fainter at magnitude 17.0.


     Mike Wood made three observations this month,  using a Takahshi 180mm Mewlon telecope (Dall – Kirkham design).

NGC 2683

This drawing is of almost edge – on spiral galaxy NGC 2683, which can be found in the constellation of Lynx.  At magnitude 10.6, this galaxy is about 25 million light years from he Earth, and has an angular size of 9.3′ x 2.2′.  Magnification used was 73x.

Mike’s second drawing is the multple star 14 Aurigae, a 5th magnitude star with 3 companions of magnitudes  8.0, 10.4 and 11.0   The three brightest stars are of spectral type A9, A2 and B respectively.

The third drawing is a double star designated BU 536 which is in the open cluster M45, perhaps better known as the Pleiades. Mike describes it as an “orange pair.

Auriga 14
BU 536

 


SPA Planetary Director Alan Clitherow sent in 4 images, 3 emission nebulae plus an open cluster.  The first two images were taken using an Orion ED80 refractor and a QHY10 colour camera.   IC 1805 is known as the Heart Nebula in Cassiopeia;  M45, the Pleiades, in Taurus.

IC 1805
M45
NGC 7000

Alan’s next two images were taken with the same camera as above, but a smaller telescope;  a Williams Optics 66mm refractor fitted with a 0.8 focal reducer.

NGC 7000 is also known as the North America Nebula, an emission nebula in the constellation of Cygnus.

Here is an image of the Bubble nebula area, also an HII emision region, NGC 7635, in Cassiopeia.

Bubble nebula

Mark Beveridge sent in 7 images, all taken using a 100mm f 9 Skywatcher refractor and a SXR-H9c colour camera.  The first  are galaxies in the constellation of Ursa Major.  M81 is also known as Bode’s galaxy and is relatively large (26.9′ x 14.1′) and bright (magnitude 6.9).  M108 appears considerably smaller (8.7′ x 2.2′),  and at about 46 million light years is about 4 times more distant than M81.

M81
M108

 

Mark.s next two images are both of the Flame nebula in Orion: NGC 2024.  Close to Alnitak in Orion’s belt, fierce UV radiation is ionising hydrogen gas.  Cold gas and dust between us and the emission nebula gives rise to the dark lanes that appear to be at the centre.   The brighter of the two images was binned 2 x 2.

NGC 2024
NGC 2024

 

Here is an image of NGC 891, a magnitude 10.8 edge – on galaxy in the constellation of Andromeda. The central dust lane is clearly visible.

Face – on galaxy M74 lies in Pisces, which is magnitude 10.0 but in reality a more difficult target.  M74, being face – on, has a low surface brightness, its light is spread over a much larger area and for that reason is hard to see at the eyepiece of a telescope, and also more difficult to image.

NGC 891
M74

 

The final image sent in by Mark is a black and white image of The Horsehead Nebula, IC 434, in the constellation of Orion. This is close to star Alnitak, and the Flame nebula, described  above.

IC 434

 

Dave Finnigan