hetch hetchy night and day, yosemite

Here are shots of the hetch hetchy reservoir in the northwestern part of yosemite national park

Hetch Hetchy, night and day, Yosemite National Park

Here's a slightly brighter view of the falls and reservoir with the landscape lit by the setting moon.   the diagonal stripe mid frame is the milky way, slightly obscured by passing clouds on the horizon. 

among other things seen in this northern view are Cassiopeia, mid milky way,  and the andromeda galaxy to its right (see later images with annotations)

Here are a few hours of star trails:

the red leaves in the foreground were not turning in July, but briefly illuminated by my red flashlight while imaging. 

here's a video of the rising milky way, with some passing clouds as the moon set, followed by a reverse version with star trails, ending with the setting moon illuminating the hills. 

The dam kicked up quite a bit of spray.  i spent an embarrassing amount of time trying to capture a moonbow as the moon set.  the next morning the rising sun produced a beautiful rainbow at the same site--letting me know i was shooting from the wrong side of the spray.  DOH! 

Though there were no major meteor showers, we saw at least 4 an hour in the dark yosemite skies.  Only caught one with the camera:

Here's sagittarius and the milky way along with a few wandering planets shot from the dam

A bit to the right, here's scorpius with bright jupiter.

straight up we saw the summer triangle with the cygnus the swan mid milky way

In August, we back packed from Tuolumne Meadows to Grant lake (again in Yosemite). 
Here's a cell phone capture of my favorite constellation, Cassiopeia, the giant W, along with the milky way and the andromeda galaxy (same part of the sky as the earlier images). 

Cassiopeia from Tuolumne Meadows

here are sagittarius, saturn and the milky way rising at grant lake.

a final moon set thru haze at grant lake:

imaging details (for astrophotography nerds only):
many technical problems with these outings
the wide field images were plagued by my laptop switching to power saver mode several times grrr...
I missed focus on basically all of the DSLR images, hence the small scale.  the cell phone images showed some promise, but the phone's exposure time is limited to 10 seconds. on the plus side, it allows captures in raw mode, allowing for dark subtraction.
perhaps i'll try this again with a modern DSLR and dedicated wide field lens.

The Moment cell phone lens attachment gives a wider field of view and is faster.
though there was little chromatic aberration, there were severe star distortions at the edges requiring cropping :(

Hetch Hetchy wide field (night)
ZWO ASI 290MC
stock fisheye lens
Shutter=20.0s
Gain=351 (58%)
20 second exposures continuously from
11:43 PM 7/7/19 to 1 AM 7/8/19 AM PDT
Hetch Hetchy, Yosemite National Park, California

(day)
Samsung Galaxy Note 9
FL 4.3 mm f/2.4

Moon
Nikon D60
stock lens (18-55) @15 mm f/3.5
30 s
ISO 1600

Rainbow

Nikon D60
stock lens (18-55) @18 mm f/8
1/250 s
ISO 100

Meteor, Sagittarius, Scorpius, Cygnus
Nikon D60
stock lens (18-55) @18 mm f/3.5
30 s
cygnus 88x30 sec ISO 400
scorpius 8x30 sec ISO 1600
saggitarius 5x 30s ISO 1600
even with dark subtraction, there was significant amp glow especially on the cygnus shot, hence the desaturation.
sky watcher star adventurer mount (tracking stars)

cell phone Cassiopeia and Sagittarius
Samsung Galaxy Note 9 with moment Wide 18mm Lens (Magnification Ratio - .63X)
FL 4.3 f/ .945 ?
30x10 s
ISO 800

Jupiter at opposition 2019: great red spot unfurling

Jupiter reached opposition (directly opposite the sun) June 10th.  you can see it rising in the east after sunset.  It will get higher and higher in the evening sky over the next few months.

Here's my first Jupiter of the season from June 9th right before opposition:

Jupiter 6/9/2019 08:52 UTC

this infrared image enhances the great red spot and the mid equatorial zone (more about the latter later):

Jupiter IR-GB 6/9/2019 08:52 UTC

Recently, portions of the great red spot were found to be peeling off.

Here's a blink of the GRS at larger scale with and without IR enhancement:

Jupiter 6/9/2019 08:52 UTC

The enhancing red stripe is likely a section of the great red spot that has peeled off. 
Here's a time lapse of the great red spot taken by BQ Octantis, a member of the cloudy nights forum, imaging from the Australian outback:

posted with permission

A section of the great red spot appears to peel off on June 1 and then progress to the right.  

Here's an article at sky and telescope with more details and images.  
https://www.skyandtelescope.com/astronomy-news/jupiters-great-red-spot-unfurls-see-it-in-your-scope/

Imaging details:

camera ZWO ASI 290MM with ZWO RGB filters

Baader IR pass 685 nm, Astronomik IR pass 807 nm

6/9/19 08:52 UTC

celestron 11" Edge HD

televue 2x barlow

90 second captures 4 each filter (2 for each of the IR filters)

gain 351, exposure ~3-6ms, 30% histogram, ~150 fps

IR 685 Shutter=4.831ms, FPS (avg.)=145

IR 807 Shutter=23.89ms, FPS (avg.)=41
corrector fogged up despite dew heater, blurring detail
so image is only 50% scale :(
807 nm images as sharp or better than 685 nm despite longer exposure, lower fps

sunspot AR 2738 and a few proms

Despite being at solar minimum, a moderately large sunspot was well positioned mid April:

AR 2738 4/14/19 WL

AR 2738 4/14/19 Ha

AR 2738 4/14/19 Ha and WL

The following weekend as the spot rotated off the face to the edge, i watched very dynamic activity on the limb, including a prominence lifting off and a very bright ball of plasma:

Ha 4/20/19

...which i just missed with the camera :(

but there was a nice prominence on the opposite side:

Ha 4/20/19

Full disk view through light incoming clouds:

Sun Ha 4/20/19 through light clouds causing glare

Image details:
C11 edge on ASA DDM 80, baader film, baader continuum filter, IR/UV block filter
first light with C11 soloar filter, love the cooling fans, unfortunately seeing was poor
Lunt 60 PT on manual alt-azm mount
Eastbluff, CA

4/14/19 poor seeing (image reduced to 50%)
C11
19:45 UTC
ASI 290 MM
FPS (avg.)=147
Shutter=0.918ms
Gain=351 (58%)

Lunt double stacked
20:56 UTC
ASI 290 MM
FPS (avg.)=103
Shutter=9.699ms
Gain=67 (11%)

4/20/19
first prom
ASI 290 MM
22:55 UTC
second 22:58 UTC
20 second video
111 fps
Shutter=1.0 ms
gain 351
best 12%

full disk with light clouds
ASI 174 MM
23:09 UTC
45 fps
Shutter=10.00ms
Gain=225 (56%)

Markarian's chain

Speaking of the Virgo supercluster, here's Markarian's chain, a photogenic string of galaxies in the Virgo cluster:

Markarian's chain 4/2010

including Messier 87 lower left

Here at low magnification, M 87 (featured in the prior post) is the nondescript elliptical galaxy in the lower left.

bonus feature:
close up of the "eyes", a pair of interacting galaxies in Markarian's chain

NGC4438 & NGC 4435
Note the disturbed dark lane and streaming outer stars in the left hand galaxy, resulting from gravitational interaction with it's neighbor

this is occasionally the basis for my avatar ;)

Details:
markarian's chain
FS60C @f/4, IDAS-LPR filter, SX H9, H9C.
Lum 45x5 min 223x1 min
RGB 101x5 min
los alamitos, CA 4/3-17/2010 bortle white skies

NGC4438 & NGC 4435
nexstar 8 gps, f/6.3 FR, H9C
350 minutes (70x5)
approximately 2/3 with IDAS LPR filter, 1/3 without
4/23,24,30/2006!
Los Alamitos CA
bortle white skies, mediocre seeing, worse transparency

Messier 87 the smoking gun galaxy

Messier 87, the smoking gun, is a super giant galaxy--over a trillion  stars--in the constellation Virgo.  M 87 lies 55 million light years away, at the center of the Virgo supercluster which includes our local galaxy group. 

Images of the black hole at the center of M87 were released last Wednesday, 4/10/19.  Inspired by the image, I photographed the galaxy from my backyard that night. 

At low power, M 87 looks like a boring elliptical galaxy, just round blob of light (see following post).  This close up shot from 4/10/19 shows blue "smoke" rising out of the core to the right which is actually plasma ejected from the core as the black hole devours matter.  

M 87 close up
streak of blue plasma projects up and to the right

Needless to say, the resolution of this image is not fine enough to capture the black hole.  The scale of this image is 0.4 arc seconds (angular measurement, as in degrees, minutes, and seconds) per pixel.  However, due to atmospheric distortion, the resolution of the image is about 2.0 arc seconds (FWHM).  On a good night, i can capture images below 2 arc second resolution, the best i've ever captured (once) was just under 1 arc second.  For reference, the resolution of the Hubble space telescope is typically 0.1 arc second.  The resolution of the event horizon telescope that captured the black hole was .00002 arc seconds.  

Here's the Event Horizon Telescope image:

Event Horizon Telescope Image of the supermassive black hole (6.5 billion solar masses) in the center of the galaxy M 87

How can you get such amazing resolution? 
The resolution of a telescope is limited by it's diameter.  However, if you can combine the signal captured by multiple telescopes at the same time, the resolution is limited by the distance between the telescopes.  The event horizon telescope combined images captured by an array of radio telescopes all around the globe (including the south pole) giving an effective diameter approaching the size of the planet earth.  Interestingly, i've heard that the release of the image was partially delayed by having to physically transport a hard drive from the south pole (which cannot be easily reached all year round).  

The phenomena surrounding a black hole are truly amazing: of course at the event horizon no light can escape the gravitational pull of the black hole.  But beyond that is an area where photons themselves orbit the black hole multiple times.  creeping out from this are areas where light may bend 270 degrees: so if you look on the left side of a black hole, you'll see an image from the black hole facing left.  beyond that 180 degrees, so you'll see the image of our own galaxy reflected back, further out 90 degrees, so you'll see an image from the black hole facing right...
Here's a trippy youtube video simulating this phenomenon while two black holes are merging:


And here's an interesting video giving more detail on the light bending phenomena near a black hole:




Details:
8" LX200R, SX Trius 694 0.4"/px, ASA DDM60
astrodon LRGB E SERIES GEN-II
Luminance 4/10/19
12 of 46 120 second subs, 7 of 63 60 second subs
(threw out all with FWHM >5.5 pixels)
RGB 4/12/19
15x120 sec each channel
fair seeing (excluded ~2/3 subs)
the jet is very bright, the image is a simple linear stretch without sharpening
Eastbluff, CA Bortle white

EHT press release with more details on the black hole image:
https://eventhorizontelescope.org/

 A bit more science:
The Astrophysical Journal Letters
https://iopscience.iop.org/journal/2041-8205/page/Focus_on_EHT

A red flame

Captured a few solar prominence images between clouds this weekend with a hydrogen alpha scope .  I typically process these as black and white for maximum contrast, but red (the actual color) seemed most appropriate today:

Solar Prominence 2/9/2019

Here's a prominence from the next day.  I cranked the exposure to bring out some of the faint detail.  

Solar Prominence 2/10/19

Same prominence with shorter exposures:

Solar Prominence 2/10/19

wider crop for fun:

Image details:

Lunt 60 PT on manual alt-azm mount

ASI 290 MM

Eastbluff, CA 2/9/19  22:03 UT, 2/10/19 19:05 UT

2/9/19

double stacked

20 second video 60 fps

Shutter=2.786ms

best 25%

2/10/19

single stacked

20 second video 48 fps (full frame by mistake)

Shutter=2.379ms to 20.58ms

best 25%

spacex falcon 9 10/7/2018 launch

Why the 10/7/2018 falcon 9 launch was special:

1. it was launched from vandenberg airbase aiming south over the ocean
so it could be seen all the way from los angeles to san diego
2. the launch took place after dark, so the bright rocket could be seen well
3. it was done shortly after dark, so as the rocket rose above the shadow of the earth the exhaust was back-lit by sunlight, glowing brightly in the sky, presenting a cinematic view to los angeles and orange counties
4. the first stage rocketed back to vandenberg, landing at the airbase--the first ground landing of a falcon rocket on the west coast--"the falcon has landed" crowed spacex launch control

falcon-9 10/7/2018

In this image the cone (upper left) is the second stage of the rocket heading into orbit with its satellite payload.  
to the right of this, the exhaust (above the earth's shadow) is brightly lit by the sun.
The bright spot to the right of the palm tree is the first stage rocketing back to vandenberg, you can see a swirl of maneuvering thruster exhaust adjacent to it.  

another shot, later on:

I assembled a series of stills sandy captured with her compact hand held camera into a rudimentary animation:

For information on future launches, you can subscribe to this email list
http://mailman.qth.net/mailman/listinfo/launch-alert
which will send launch alerts, as well has information on the more spectacular launches


image details
Sony DSC-RX100M3
f/1.8, 1/10 sec, iso 3200 9 mm
corona del mar, CA
10/7/2018
the clouds broke just in time to give a clear view of the launch, then returned
photoshop, topaz denoise for the still shot