15 replies to this topic

[maadscientist]

Had good seeing on the night of November 28 into the 29th. Ed Albin and I visually looked at Mars on my C14 and his Tectron 24" dob. Good transparency and good seeing led to great views at the eyepiece. Taken with the C14 at the end of the session.

 

Dan 

 

 

 

[EarthlingUk]

Looks like it's reflecting the North America nebula! :-)

Great capture. Sharp and with clouds! At least I'm assuming they're clouds.

[Kokatha man]

Nice Dan  although there does seem to be something happening with what looks like vertical lines or smears/striations across the disk, particularly in the Sthn. Hemisphere..?

[coopman]

Canals!  I see Canals!

Great image!

[Borodog]

Wow. Just wow. Great image.

[maadscientist]

Looks like it's reflecting the North America nebula! :-)

Great capture. Sharp and with clouds! At least I'm assuming they're clouds.

Thanks! Yes, they are clouds.

[maadscientist]

Nice Dan  although there does seem to be something happening with what looks like vertical lines or smears/striations across the disk, particularly in the Sthn. Hemisphere..?

Thanks! Yes, I see it. I'll go back and try and find what happened. Thank for pointing that out.

 

Dan

[maadscientist]

Canals!  I see Canals!

Great image!

Haha! Thanks.

[maadscientist]

Wow. Just wow. Great image.

Thanks Borodog! The forecast was average seeing turning to good at midnight, but after fiddling with Ed's GOTO on his dob, we found out quickly seeing was good around 10pm. Spent 2 hours at the eyepiece on Jupiter then Mars. By the time I fired up the camera on the c14, the seeing had inched up to really good. Sometimes everything cooperates and you get one of those nights....

[Kokatha man]

Dan - if this image is a WinJUPOS derotation of quite a lengthy duration, is this possibly "a bridge too far" with the duration.....the double "rind-like artefacts" present leads me to this possibility..? 

[KiwiRay]

Dan - if this image is a WinJUPOS derotation of quite a lengthy duration, is this possibly "a bridge too far" with the duration.....the double "rind-like artefacts" present leads me to this possibility..? 

I suspect Topaz AI or similar processing. A lot of the finer 'details' don't even appear in Hubble images. I'd be interested in seeing a version with more conventional processing, as I think the underlying data are very good.

[maadscientist]

Dan - if this image is a WinJUPOS derotation of quite a lengthy duration, is this possibly "a bridge too far" with the duration.....the double "rind-like artefacts" present leads me to this possibility..? 

Hey Darryl, I don't use de-rotation. I think there are some frames in the stack that are distorted giving the double rind effect. Most people photoshop those out, but I leave them in just to show the true stack. I went back and re-processed the stack reducing the aggressiveness a bit. I've still got those striations. I'll dig a bit on the raw frames and see if I can figure out what's happening. For now, here is a redo.

 

[maadscientist]

 A lot of the finer 'details' don't even appear in Hubble images.

Here is a Hubble Image of the same area a few years ago. Then mine. Not sure what you are talking about or insinuating. The Winds and dust storms, which recirculate topsoil, can alter the appearance of albedo markings. There have been dust storms on mars this opposition and that is why the dark albedo areas are more plentiful in my image. Also dust can darken crater areas and change the shadows.

 

 

[BillHarris]

I would expect minor dark detail to be variable between images. The pervasive micrometer-sized dust blows off of the black basaltic bedrock and creates changes.

[dcaponeii]

Thanks! Yes, I see it. I'll go back and try and find what happened. Thank for pointing that out.

 

Dan

I got the same thing the other night and you could see it in the histogram as a series of equidistant peaks superimposed onto what looked like a normal histogram.  I chalked it up to the really high speed jet stream I had overhead.  I'll be interested in you find a better cause and correction.

[Borodog]

I think those striations are probably real.