summer saturnalia

Still celebrating a summer Saturnalia.  I've had a run of the best seeing locally in several years.  It's a great time for planetary observing with Venus at sunset, Jupiter transiting at a gentlemanly 9 pm, Saturn near opposition around midnight, and then a blazing Mars rising in the east, approaching  opposition later this month.  

Here are more images from my recent capture of the Saturn's polar hexagon.  Infrared, up-sampling the video by a factor of 3.  

Saturn with north polar hexagon, infrared image 6/26/18 7:45 UTC

Here's a north polar projection, showing the hexagon:

The hexagon was not visible in my RGB image (click on image for full size):

Saturn RGB 6/26/18 7:45 UTC

Here, I've added infrared as luminance to bring out the hexagon in the RGB image.  You can also see that the banding on the disk is much more prominent in infrared (click on image for full size).

Saturn with north polar hexagon, RGB with IR luminance  6/26/18 7:45 UTC

Lastly, here's an annotated wider field:

The cause of the hexagon is still not clear.  One theory is that a hexagon forms where there is a steep variation in the speed and viscosity of atmospheric winds.  The hexagon was blue when it was discovered by the voyager probe in 1981, but has changed to a gold color.  More information on the hexagon at wikipedia.  

The north polar hexagon can only be imaged from earth when Saturn's north pole is tilted towards us.  It was maximally tilted towards us last year and will be tilting away for the next 15 years, when the south pole will be facing us, then begin tilting back.  So you can see the source of my urgency in capturing it.  

image details
celestron 11" Edge HD
ZWO ASI 290MM
zwo RGB filters, Baader IR pass "685" nm
processed in PIPP
upsampled 3x in autostakkert
sharpened in registax
combined in winjupos
6/26/18  07:45 UT
Eastbluff
Southern California

Eureka, The Hex!

neared Saturnian nirvana last night 
think i got a legit shot of the hexagon
if you look closely at the top dark ring, you can see the corners:

Saturn Infrared

image details
celestron 11" Edge HD
ZWO ASI290MM
Baader IR pass "685" nm
3 minute capture
FPS (avg.)=269
Shutter=3.532ms
Gain=351 (58%)
33% histogram
upsampled 2x in autostakkert
sharpened in registax
6/26/18  07:45 UT
Eastbluff

Southern California

Jellyfish, Supernova Remnant IC 443

The Jellyfish nebula is a large supernova remnant in the constellation Gemini. Hydrogen (Ha-red) and Oxygen (OIII-blue):

IC 443 in Ha and OIII
click for larger size

Here's a bright starless Ha version in jellyfish orientation with the "body" up top and "tendrils" reaching down:

Jellyfish Nebula Ha

The OIII signal is much more faint than the Ha, it was boosted in the above image to show the OIII detail. 

A darker version with the blue OIII barely visible

Blink comparing starless Ha and OIII versions:

IC 443 in hydrogen and oxygen

Note that in OIII it looks much more like an expanding ring of gas resulting from an explosion than Ha. 

Here are brighter versions of Ha:

IC 443 Ha

and OIII:

IC 443 OIII

The nebula is 50 arc minutes, larger than a full moon.

Now some of you crab nebula fans are probably asking where is the neutron star remnant? Is there a pulsar, pulsar wind?  The box lower left, is the location of a presumed pulsar--a spinning neutron star left over from the star that exploded:

The blinking spot is the approximate location of the pulsar.  

The thin filament seen in Ha (red) going to the left and upwards slightly, follows  the line of apparent motion of the neutron star superimposed on the pulsar wind (see below). 
There is still some debate as to whether this structure was responsible for the supernova due to it's off-center location.  The assumption is that it was an asymmetric blast. 

The Neutron star was only recently discovered.  It was not detected in visible light, but found by the Chandra X-ray observatory along with a surrounding pulsar wind nebula:

Chandra X-ray image

Though Chandra detected the x-ray source, pulsations were not detected.  The estimated period is 0.1-0.6 seconds, which was below the sensitivity of the equipment, i blinked it at .2 s ;)

The second box, upper right, looks like it might be a small planetary nebula.  

However, SIMBAD lists a star cluster, molecular cloud, and bright nebula at this location--no planetary nebula:
Teutsch GN J0615.3+2253 -- Bright Nebula
  6 15 21.1 +22 53 27


Image details:
When I first shot it, I forgot that it was a supernova remnant and took a few test shots in SII and NII, only to find that they appeared to simply mirror the Ha with much weaker signal.
Despite imaging with narrower band width and 2x binning, the OIII is still much more faint than the Ha.
FS102, SX Trius 694 FL 627.3 mm, 1.49"/Pixel unbinned, reduced in photoshop to 3.9"/px
astrodon 5nm Ha, 3nm OIII filters
ASA DDM60
Ha 102x10 min + 20x10 min bx2
OIII 152x10 min bx2
total 45 hours 40 minutes ;)
1/14-2/23/2018, bortle white skies
eastbluff, CA

first Jupiter of the year 6/8/18 6 AM UTC good seeing

Here's my first jupiter of the year:

Jupiter and moons 2018-06-08-0512 UT

seeing was unusually good:

Jupiter 2018-06-08-0611_1 R-G-B

spent all last year tweaking equipment trying to get a good planetary image and got mush.  this year, first time out with older equipment i got lucky with good seeing, blowing away anything i did with my fine tuned rig last year :(

a few comparisons for imagers:
RGB camera up sampled 2x vs barlow:

RGB camera upsized x2

RGB camera 2x barlow

close, but very slight edge to the barlow

RGB camera barlowed 3x2 minute runs combined:

mono camera 1 minute x 2 each channel:

corrector fogged out before i could get a barlowed mono image :(


image details
celestron nexstar 8 GPS (8" SCT on a wedge)
wide view
ZWO ASI120MC
2 minutes with firecapture 5 ms exposures @ 21 fps
6/8/18 5:12 UTC

large view
ZWO ASI290MM
ZWO RGB filters,
2x60 second captures for each filter R G B
captures with firecapture ~5ms @ ~180 fps 30% histogram
6/8/18 6:11 UTC
stacked in autostakkert (upsampled x2), combined in WinJupos, sharpened in registax 6
final combine in photoshop

not shown: IR filter added little
adding small boxes closer to the edge in autostakkert, gave better peripheral detail

Eastbluff
Southern California

fiery prominence

hope others were able to get out and enjoy some sun today
looked very flame-like so i went with orange

Solar Prominence in Ha 5/28/2018

Image details:
Lunt 60 PT DS on manual alt-azm mount
ASI 290 MM
5 second video 99 fps
Shutter=5.0 ms
Eastbluff, CA 5/28/18 22:37 UT