Archive for the ASTRO Category

Moon shots – October 27, 2018

Posted in ASTRO on December 1, 2018 by maxpho

Some forgotten lunar shots from a poor session. The seeing was highly variable that night, but it never exceeded a 6-7/10 value. However, some interesting features were imaged, using the 355mm Newtonian and ASI 174MM with a Red filter.

Mare Crisium and surroundings, including crater Messier at far right:

crisium wide.jpg

A closer look at Crisium, and its rimae:

CrisiumDetail.jpg

Crater Cleomedes and its many rilles crossing the floor:

floor.jpg

Atlas and Hercule; notice the double ringed crater on lower right:

atlas.jpg

Crater Gassendi and surroundings, under almost vertical illumination:

gassendi.jpg

Craters Kepler (left) and Aristarchus (Right) dominating the view, again at almost Full-Moon phase:

Kepler.jpg

Mare Nectaris with Theophilus on its shores:

Theophilus.jpg

Mare Orientale on the limb. Notice the distinct peak towards the right.

orientale basin 1.jpg

A closer look at the peak:

peak.jpg

 

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46P/Wirtanen – November 30, 2018

Posted in ASTRO on December 1, 2018 by maxpho

A fresh image of comet 46P/Wirtanen, under poor skies and only a handful of frames. Very cold, -12 Celsius, with ice forming on the entire setup. Very poor seeing. The comet’s coma is elongated, but no tail is discernible. Some rather small galaxies are visible in the background. The coma is 20 to 30 arcminutes in diameter in this image.

46p Nov302018 note.jpg

And a full resolution image:

46p Nov302018.jpg

 

Also, from the same session:

A spectrum of galaxy M 77, a Seyfert type galaxy, with an active nuclei.

M77 spectrum.jpg

And a single shot of a supernova near the core of the same galaxy:

SN 2018ivc Nov30.jpg

The Moon on November 12, 2018

Posted in ASTRO on November 14, 2018 by maxpho

A wonderful sight on the SW horizon: the Moon slowly setting with a nice Earthshine and the top of trees eclipsing from time to time parts of our satellite. This was my view on the evening of November 12.

Did manage to get some shots, the first one being an RGB image processed in such way to show the very subtle colors of the Moon depicting minerals on the lunar surface.

Equipment: 115mm F/7 APO Refractor, ASI 1600MM with RGB filters at the focal plane.

ColorMoonNov12.jpg

A quick look at Sirius and Sirius B from the night before, in poor seeing:

SiriusBNov12.jpg

Eskimo nebula – 2018

Posted in ASTRO on November 10, 2018 by maxpho

This is an image of the well known planetary nebula “Eskimo” in the constellation Gemini. A well placed object in the winter sky, and a nice view in instruments above 100mm in diameter.

In larger scopes however, the details really start to show, but in no way are they close to astro-images of this object. For example the view in the following shot is not to be seen visually with the same scope I’ve imaged it. You’ll need excellent seeing for those small filaments at the core of the nebula, but in order to see them you will also need to employ a rather large magnification (above 200x) which on the other hand means that the surface of the nebula will get really dim…So the best way to truly enjoy this objects is:

Eskimo2018.jpg

This is still work in progress, but I could add some colors to the above image, colors coming from a session 4 years ago…

EskimoCOlor.jpg

My older shot of the Eskimo can be found here.

Comet 46P – One month of evolution

Posted in ASTRO on November 6, 2018 by maxpho

After one month since my first image of this comet, I’ve finally had one hour to image it again. Very poor conditions, suburban skies, poor transparency and the comet rather low. But these were the conditions on October 5 also, so no harm done 🙂

Using the same equipment under similar conditions, I can now compare the aspect of the comet and see just how much it changed in one month.

The image below shows that it is much brighter and larger. Waiting for the next session, hopefully in better conditions this time…

One MOnth 46p.jpg

And the November 5 image only:

November52018 46P.jpg

 

High Resolution lunar images – October 31, 2018

Posted in ASTRO on November 1, 2018 by maxpho

After so much time without imaging our natural satellite, I’ve finally got a chance to “shoot for the Moon” once again.

And what a chance: the seeing was good enough to allow the usage of a green filter instead of the regular red one. The image was not that stable (the Jetstream was in the 15-20 meters value), but for some of the imaged lunar regions I’ve surpassed my own previous resolution values.

SETUP: 355mm F/4.5 modified Newtonian on EQ6 mount. 2.7x and 2.5x barlow lenses. ASI 174MM camera with a Baader green filter. Seeing: 6-7/10 to 8/10 in very good moments. High humidity and some fog (very early in the morning), but as all planetary imagers know, that is a good thing;)

First shot is an originally sized image of Clavius, with a not so strong processing workflow. The image is my personal best of this feature, with small craters of just 600 meters (due to the high latitude of Clavius on the Moon, the actual resolution on its floor cannot be the same with the one in, let’s say, Ptolemaeus which is closer to the lunar equator, and this is due to the angle at which Clavius is imaged).

ClaviusOct31.jpg

Another new personal best: crater Tycho with some very very very small “hills” on its floor, something that was sunk in the image noise in my older shots of the area.

TychoOct312018.jpg

The large crater Pitatus with its highly fractured floor, and the double crater (or “crater in crater” looking) Hesiodus A.

Smallest craters are around 520 meters in this image.

PitatusOct312018.jpg

The large flat floor crater Archimedes, and the sinuous Rima Hadley. Smallest detectable craters are around 530 meters wide.

ArchimedesOct312018.jpg

The South Pole with Clavius dominating the view, but also with Moretus in the shadows. Nice perspective of the mountains near the limb.

SouthPoleOct312018.jpg

One of my favorite areas on the Moon: the Triesnecker crater with the nearby complex rille system, and the Hyginus rille, mostly in the shadows.

TriesneckerHyginus.jpg

The well known trio of craters Arzachel, Alphonsus and Ptolemaeus. Each of these craters shows a different evolution, and each of them has some very interesting details on their floors. Arzachel has some nice rilles, as does Alphonsus. Ptolemaeus on the other hand has a lot of small craters that are useful for measuring the actual resolution on images. In this case, the smallest craters are about 450 meters (while some detectable rilles are smaller). Unfortunately the seeing was rather variable during the acquisition, so the middle frame (this is a 3 image mosaic) showing Alphonsus is suffering from a slightly lower resolution.

PtolemaeusAlphonsusArzachel.jpg

Copernicus crater.

CopernicusOct312018.jpg

The large flat floor crater Plato and the distinct Vallis Alpes dominate the Northern area of the Moon. The small craters on Plato’s floor are used by amateurs to determine the resolution of an image; in my case the seeing was not great at the time but still, some craters of about 600 meters are detectable. There are also a series of smaller rimae systems between Plato and Vallis Alpes, collectively named Rima Plato. I am not sure however that the smallest of them, a two or three-way system at middle-point between Plato and the “mouth” of Vallis Alpes, should also be called Rima Plato; this feature seems more related to Vallis Alpes.

PlatoandAlpisOct312018.jpg

White light vs H-alpha light – October 13, 2018

Posted in ASTRO on October 16, 2018 by maxpho

A short session with the Sun and the new active region. Strong wind, poor seeing, but a nice warm day. Just a comparison between the white light photosphere view with the H-alpha view of the chromosphere.

150mm achromat, Baader Herschel prism, Quark H-alpha, ASI 174MM. Seeing 3-4/10.

WhiteLightvsHalpha.jpg