M45 The Pleiades

 

Unchanged for eons. The Pleiades or the 7 sisters look the same today as they did for the first humans that walked the earth 1.9 million years ago. Without doubt the most beautiful and most recognisable of all the objects we can see in the night sky, this cluster of stars shine and reflects a hypnotic blue light onto dust that the stars are passing through. There is even a bronze age 1600bc artifact called the Nebra sky disk that is believed to depict the cluster. Located at a distance of around 400 light years. This means the light we see today left at the time Galileo Galilei made his first observations with the first telescope.

Nebra Sky Disk image first published Dec 2006 Copyright Dbachmann

Galileo's drawings of the Pleiades star cluster from Sidereus Nuncius. Image courtesy of the History of Science Collections, University of Oklahoma Libraries.

Pleiades

A star cluster known to every civilisation and buried within the folklore across every culture on the planet, The Pleiades or the seven sisters is probably the most recognisable of all the 88 constellations. I think also the best example of a reflection nebula. Containing over a thousand members mostly of hot young stars. Slowly moving through space through an unrelated dust cloud, the dust is illuminated by light and the energy of the stars.

I love the way the dust is sculpted in front of the stars Maia & Merope.

Just under two hours of exposure time captured in 3 minute exposures using the ZWO ASI294MC pro, Calibrated with Flats, Darks and Dark Flats The first real test too using the new auto focus routine with the ZWO EAF focuser. All I can say is incredible, A quick and simple procedure that takes 2-3 minutes and can be incorporated into the autorun of a sequence. You can add a change to focus via temp difference or time. A Video to follow.

First Light M1

It has been a long time waiting. But here it is first light from the new Hills Observatory. I thought I would pay homage to Messier's no 1 in his collection of fuzzies to avoid the great Crab Nebula M1. The last two nights have been clear if somewhat damp. A good test or the new home of my scopes. Water has been dripping off the outside of the dome and the grass is soaked you can feel the damp in the air. But I still wanted to have a play. The observatory has worked incredibly well no damp on the internal walls or inner dome. Now moisture build up on the mount or Pier. The optics remained clear too. I didn't even power up the dew heaters. So here is the pic. A wide field shot of M1 in all its glory. A 3 hour guided exposure over 2 nights of 2.5 minute subs at ISO 800 Dark's subtracted. I will do a series of flats over the weekend and re post if I get an improvement. Let me know what you think.

M 45 Revisited

     As I mentioned previously I am returning to those treasures that I had previously captured using my Canon 300D. After a wonderful clear sky day at the zoo with my family. I wanted to get what could be the last trip outside before my training starts, and that will mean well into Jan before another opportunity comes along.

So here is the result.

There was a 86% humidity last night so the dew heaters were working overtime but did their job well.

    This image is a stack of 61 x 1 minute Iso 800 unguided exposuress in RAW. No darks or other calibration files used.
I may even have another go with the Lumicon deep sky filter on too?

    I can see a gradient across the image but do not posess the gradient remover tool. Contains a good DDP stretch . This is the first run of this set so I may return and update it if I get chance to look at what else I can do in Images plus. I have the untouched master Tiff file is anyone wants to have a go with it too just drop me an email.

I am quite pleased with the result the wispy tendrills are much more pronounced around Merope and Maia. Everything about the image is a good deal more natural I also like the horizontal shock waves under Electra.

PS poor jpeg compression . I will look at it when I can.

M1

Object: Messier 1 (M1, NGC 1952),

Type: Super Nova Remnant

Distance: 6500 Light Years (Approx) Constellation: Taurus
Date: 27th October 08
Equipment: William Optics Megrez 90 Canon EOS 40D
Subframes: 41 x 30 second exposures unguided at ISO800
Processed: No darks or flats were captured. Processed in Images Plus 2.0 with a non linear stretch or DDP. 7

Notes: Observed by a Chinese astronomers on July 4th 1054 AD, the Guest star was seen in daylight for 23 days and visible to the naked eye in the night sky for a staggering 653 nights.

Approx 10 Light years diamater expanding at 1,800 km/sec.

At the center of the nebula lies the Crab Pulsar, a rotating neutron star, which emits pulses of radiation from gamma rays to radio waves with a spin rate of 30.2 times per second. The nebula was the first astronomical object identified with a historical supernova explosion.

I am not entirely happy with this shot a bit more processing perhaps or a new series without frosty optics I really wanted to glimpse the Pulsar.

Back In Time: As the light left M1 we travel back to the year 4493BC. Chronicles suggest early Mesopotamian cultures in present day Iraq and Egyptian civilizations on the Nile. In England the Neolithic period was just commencing and Stonehenge wasn't far off being constructed.

M45 The Pliedies

Object: M45Type: Open Cluster
Distance: 380Light Years (Approx)
Constellation: Taurus

Date: 27th October 08

Equipment: William Optics Megrez 90 Canon EOS 40D

Subframes: 6 x 30 second exposures unguided at ISO800 and 1 x 3.5 Minute Autoguided exposure again at 800 ISO

Processed: No darks or flats were captured. Processed in Images Plus 2.0 with a Moderate non linear stretch or DDP. 7 Iterations on a adaptive Richardson Lucy deconvolution filter.

Notes: The Pleiades nebulae are blue-colored, which indicates that they are reflection nebulae, reflecting the light of the bright stars situated near (or within) them.

Back In Time: As the light left back in 1627, back on earth a Dutch ship sighted the coast of southern Australia, while the English were colonising the island of Barbados. An earthquake devastated southern Italy and astronomer Johannes Keppler published his laws on planetary motion The Rudolphine Times