Try increasing gamma if dark sections aren't distinguished

Try increasing gamma if dark sections aren't distinguished

Monday, September 7, 2020

saturn and jupiter, preparing for the great conjunction

a late start on the gas giants this year due to comet neowise hoopla, here's my first of the year, a quick shot thru my smaller SCT:

Jupiter 8/26/20 6:01 UTC

Saturn 8/26/20 6:15 UTC


A GREAT CONJUNCTION of jupiter and saturn this december is getting hyped.  every 20 years or so, jupiter laps saturn in it's orbit, which means for a brief period they are very close together visually.  This year, on December 21, they will be separated by only 6 arcminutes--the closest conjunction in 400 years.  this means the two can be seen in the same telescopic field.  Their moons will almost overlap.  

OK realistically speaking, the planets will both be very low in the sky at this time of year. therefore, the seeing will be poor, limiting the ability to get fine detail.  furthermore, the field of view required to capture all the objects will be too large to portray fine detail.  that being said, the juxtaposition will probably look pretty cool to veteran astronomy buffs who are not used to seeing the two objects in the same field.  

Visually, you can "prepare" for the conjunction, by watching the two planets grow closer together in the evening sky.  photographically, i'll have to work to get a planetary imaging system with a large field of view.  i may actually use a refractor ;)

More information:

Great conjunction at EarthSky

Wikipedia link



Image details:
nexstar 8 GPS (altazimuth)
ZWO ASI120MC
90 seconds
eastbluff, CA 8/25/20



Tuesday, August 25, 2020

a perseid

back in eastbluff i decided to try out my D850 on the perseids on 8/11/20.  an extremely bright meteor streaked like lighting across the sky as i set up my camera at round 10 or 11 pm...only caught one with the camera over the next 3 hours:

Perseid 8/11/2020



close up





image details:
8/11/20, eastbluff, CA
nikon D850
Sigma 15mm F/5 EX DG fisheye
30 sec, iso 200
focusing the D850 with live view zoomed in and super high iso was a joy, giving tight stars on close up (though distorted by the fisheye) compared to the D60

this contrasts with my dark sky neowise images with twice the aperture and 100x greater ISO.  the image would be solid white if i tried that under polluted skies.  

Saturday, August 22, 2020

our galaxy

the milky way has been on my to do list for a while. here's a shot from the desert:

Milky Way 7/21/2020, Sheep Hole Valley Wilderness,  Mojave Desert


my best to date, though somewhat anticlimactic as it was a 20 second afterthought while shooting comet neowise

another edge on galaxy for comparison:

NGC 3628 35 million light years away
2007

previous attempts:
Hetch Hetchy, stacked images, dark skies old out of focus DSLR
2019


wide field stack from light polluted skies
2018 webcam


first ever 2004.  the faint "smoke" coming out of the chimney is the milky way, totally by accident






image details:
sheep hole valley wilderness, mojave desert, CA
7/21/20 10:00 PM pacific
nikon D850
wide field: Sigma 15mm F2.8 EX DG fisheye
20 sec ISO 25,600

NGC 3628
4/12-17/07
los alamitos, CA
N8 GPS, F/6.3 FR @~1280mm, SX AO @~4Hz, IDAS LPR, H9C
45x20 minutes

7/7/19 
Hetch Hetchy, Yosemite National Park, California
Nikon D60
stock lens (18-55) @18 mm f/3.5
sky watcher star adventurer mount (tracking stars)
88x30 sec ISO 400
even with dark subtraction, there was significant amp glow, hence the desaturation.

8/12/18 to 4 AM 8/13/18 AM PDT (until clouded out)
Eastbluff
Southern California
ZWO ASI 290MC
stock fisheye lens with home made cardboard dew shield and kendrick dew heater
Shutter=20.0s
Gain=100 (16%)
20 second exposures continuously

2004
Canon digital rebel
stock lens