Jupiter, Ganymede shadow transit 11/10/2024 08:41.5 UTC

Here's Ganymede's shadow transiting Jupiter on 11/10/24:

Jupiter
2024-11-10 08:41.5 UTC

My goals for the evening were quick test shots of saturn and jupiter 

saturn was disappointing with mediocre seeing at low altitude,

but when i turned to jupiter the seeing improved dramatically

this combined with the GRS and a Ganymede shadow transit led to sleep deprivation.

Here's an animation of a portion of the shadow transit:

Jupiter
2024-11-10
08:24.8 to 08:48.6 UTC

wide view:

Jupiter and moons
2024-11-10
08:19.9 UTC

Saturn and moons earlier that night:

Saturn and a few moons 
2024-11-10
07:09 UTC

Imaging details:

ZWO ASI664MC

sunobserver eADC from astro hutech

celestron 11" Edge HD, no barlow
East Bluff, CA

11/10/24

90 second captures

Shutter=1.000 ms

Histogram=61%

gain 431

245 fps

captured with firecapture
stacked in autostakkert (upsampled 3x)
combined in winjupos 
processed in registax and photoshop

down sampled 50% for a final 1.5x for the first shot

1x for the animation

.5x for the wide field.

saturn was imaged low in the sky earlier that evening

the seeing was mush down low, but the eADC did well.  

This was my third night out with the eADC

the first required a bit of fiddling learning the controls/modes

the numbers on the readout are comically small. 

i had to magnify it with my cell phone

the alignment was good, but not perfect. 

the second night i dialed in the alignment perfectly, but the seeing degraded.

the third night, i just plugged the thing in, 

didn't touch the controls 

the correction was perfect all across the sky.  

very impressive.  

The ADC tuning tab in firecapture helped align the ADC:

winjupos continues to show it's value:  

the image derotation section has an option to correct the position of planetary moons and their shadows.

this allows you to stack individual moon images in one fell swoop with image derotation.  

hence more apparent detail on ganymede than i've ever captured before.

the shadow stacking didn't work out as well, leaving some artifacts (removed in photoshop), but it did mask the shadow out from all the images not at the reference time, so a help there.

here's a winjupos screen shot accurately showing distortion of the shadow on the edge of jupiter and even the penumbral halo:

winjupos screen shot showing
ganymede and shadow positions

carpe noctem, saturn leads the planet parade

depressed about the time change?
get out there and enjoy the night.  
saturn is perfectly located for early evening viewing
followed by jupiter in december
then mars opposition in january

enjoy

Saturn 
10/21/24 06:07 UTC

Imaging details:
first light new camera and eADC

the ZWO ASI664MC

an upgrade from the 290MC
the frame rate was 50% higher for this image

sensitivity theoretically higher as well.  

the sunobserver eADC from astro hutech is an electronic atmospheric dispersion corrector

that uses an accelerometer to adjust the correction angle as the scope rotates across the sky

eliminating the need to correct the ADC throughout the night

very nice for a long session, though i have to say the numbers on the read out are comically small. 

i had to magnify it with my cell phone

while i have no problem with this small type.  

celestron 11" Edge HD, no barlow
East Bluff, CA

10/21/24

05:53-06:21 UTC

17 x 90 second captures

Shutter=2.347ms

Histogram=31%

gain 431

300 fps

captured with firecapture
stacked in autostakkert (upsampled 1.5x)
combined in winjupos 
processed in registax and photoshop

Comet C2023 A3 Tsuchinshan–ATLAS wrap up and an aurora fail

Stacked my comet images to see if i could pull out the anti-tail...no luck :( though you can see a bit more of the tail, especially to the right compared to the single frames.  

comet C2023 A3 Tsuchinshan–ATLAS
10/12/2024 7:23 - 7:30 PM Local
average of 119 images

Here's a cell phone shot of the "football field" with a few OCA members in action

comet C2023 A3 Tsuchinshan–ATLAS
10/12/2024 7:29 PM Local
Anza football field

A closer cell phone view approximating the field of my D850 shot

comet C2023 A3 Tsuchinshan–ATLAS
10/12/2024 7:30 PM Local
Anza

Lastly I took a "shot in the dark", trying to catch the 10/10/24 aurora from my backyard in east bluff.  no hint of the aurora (not unexpected being just south of John Wayne airport).  made some star trails for fun:

Star Trails 10/10/2024

Image details:

comet

10/12/24 19:23-19:30 local

Orange County Astronomers site

Anza, CA

nikon D850

F-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR

2.5 sec @ f/4.5 ISO 1600 55 mm

119 x 2.5 sec average combine

wide fields

samsung galaxy S22 ultra

23 mm f/1.8 1/2 sec ISO 2000

star trails

nikon D850

Sigma 15mm F/4.5 EX DG fisheye

not sure on settings, maybe 4 sec, iso 1600

Comet C2023 A3 Tsuchinshan–ATLAS

comet C2023 A3 Tsuchinshan–ATLAS
10/12/2024 7:24 PM Local

Went out to anza saturday to catch the comet.  as the beautiful pink of sunset faded, i was worried it was going to be a bust, but at 7 pm (40 minutes after sunset) i caught a faint glimpse.  it continued to improve over the next 20 minutes then gradually faded as it set.  i could see a vertical streak visually, only slightly better with averted vision.  7x50 binoculars showed a bright nucleus with a large slightly fan shaped tail, close to the photo above.  15x50 IS binoculars gave a bit better view of the core, but the field felt too small.

Animation:

large animation

click on full size if you have the band width:

Image details:

10/12/24 19:24-19:34 local

Orange County Astronomers site

Anza, CA
nikon D850
F-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR

2.5 sec @ f/4.5 ISO 1600 55 mm

will try stacking, but i'm not optimistic that it will work with the changing background sky

Edit:

corrected comet name from C/2024 to C/2023

super moon, tiny eclipse 9/17/24

Here’s a partially eclipsed supermoon rising on the evening of 9/17/24.  I happen to have 8 PM dinner reservations at beachcombers, so I headed down to a section of crystal cove with a nice view to the east a bit early to catch it.   

Partially eclipsed supermoon
9/17/24 7:17 PM

As a bonus, i caught a green flash at sunset (confirmed by 4 others), first i've ever seen from California.  sadly no pics.  I will note that as the sun was setting it seemed to be melting into the water at the bottom, suggesting the highly refractive conditions necessary for a green flash.  

a few more shots:

Partially eclipsed supermoon
9/17/24 7:19 PM

Partially eclipsed supermoon
9/17/24 7:19 PM

attempted a few composites combining long and short exposures:

Partially eclipsed supermoon
composite of long and short exposures
9/17/24 7:22 PM

Partially eclipsed supermoon
composite of long and short exposures
complete with crystal cove sign
9/17/24 7:24 PM

imaging details (most people should stop here):
Crystal Cove State Park Vista Point

9/17/24 7:17 to 7:24 PM

nikon D850
F-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR

hand held, balanced on tripod--forgot connector :)

exposure details in order:

1/10 sec @f/9 ISO 1250 300 mm
1/25 sec @f/9 ISO 1250 300 mm

1/125 sec @f/9 ISO 1250 300 mm

for the composites, i tried to portray the visual experience by combining long and short exposures in photoshop, showing a bit of the night scape and the bright glow surrounding the moon while preserving the detail of the lunar surface.  I also stamped out some pesky street lights.  

1/2 sec @f/9 ISO 1250 155 mm

1/2 sec @f/9 ISO 1250 55 mm

30 sec video capture 1/1000 sec ISO 3200 30 fps @ 300 mm
stacked in autostakkert,
sharpened in registax

Last weekend's loop de loop 9/1/2024 20:06 UTC

Last weekend (Sept 1st 2024) there was a large coronal mass ejection / flare off of the rim of the sun, followed by post flare loops that lasted for hours.  missed the flare, but caught the loops.  

Solar Prominence 2024 09 01 20:06 UTC

10 minute animation

Solar Prominence 2024 09 01
19:59 - 20:10 UTC

A few minutes on the little guy

Solar Prominence 2024 09 01

Image details:
Eastbluff, CA
2024 09 01
19:59 - 20:10 UTC

M class flare peaked at M5.57 south of AR3811 followed by persistent loops

Ha 
Lunt 60 PT B1200 
manual guiding with alt-azm mount
zwo ASI 290MM
20 second captures
FPS (avg.)=183
Shutter=2.163ms
Gain=351 (58%)
best 25% frames
autostakkert, registax, photoshop
aligned and manually de-rotated in photoshop

here's an autoalign in photoshop without derotation

Solar Prominence 2024 09 01
19:59 - 20:10 UTC

after tedious manual derotation/alignment

Solar Prominence 2024 09 01
19:59 - 20:10 UTC
manual alignment and de-rotation

Loop the loop

Delta Equulei is 60 light years away

 Equuleus (Latin for little horse) is a faint constellation near pegasus (hence the horse theme) rising in the east these nights.  

Constellation Equuleus
"little horse"
horse's head only

Delta Equulei, is the second brightest star in this constellation.  at magnitude 4.47, you'd need dark skies and/or binoculars to see it.

This star is 60 light years away.  

According to Einstein's theory of relativity, the speed of light is the same for all observers.  consider a spaceship moving away from the sun at half the speed of light.  light from the sun speeds by us at the speed of light and then speeds by the ship at the speed of light.  shouldn't it be half the speed of light relative to the ship? 

Speed = distance/time. so the solution is that time slows down on the ship relative to us, keeping the speed of light constant.  

Consider a photon leaving Delta Equulei 60 years ago.  Some of us have experienced 60 years waiting for its arrival tonight.  But the photon, traveling at the speed of light experienced no time at all.  

Something to think about on this day as time flies by.  

imaging details:
nikon D850
poor seeing 
F-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR @ 55 mm F/4.5
20 sec, ISO 400
skywatcher star adventurer tracking mount

Eastbluff, CA

September, 2024

spikes added in processing

apologies for the recurrent theme

Solar maximum, AR 3780

 The sun was littered with sunspots this weekend leading some to claim we've reached the maximum of Solar Cycle 25.  

Sun full disk 8/9/2024 00:05 UTC
Ha Filter "detuned" to continuum.

Sun mosaic 8/9/2024 WL reduced to 33pct

One of these groupings was responsible for another major geomagnetic storm sunday night with aroras visible as far south as texas and arizona (it was cloudy here or my camera would have been out).  

Here's a close up of the largest group, AR 3780 a few days later.  The earth is about the size of the dark circle to the left.  

AR 3780
8/10/2024 23:08 UTC

More shots:

Sun full disk 8/9/2024 00:05 UTC
Ha Filter "detuned" to continuum
colorized

sun continuum v Ha
8/9/2024
00:00.1 UTC
80 pct

Sun full disk Ha exclusion
(central portion inverted)
8/9/2024
 00:00.1 UTC 

Image details:

Ha 

Lunt 60 PT B1200 

manual guiding with alt-azm mount

zwo ASI 174MM

20 second captures

best 20 pct

8/9/2024 00:00.1 to 00:05 UTC

disk:

FPS (avg.)=130

ROI=1936x1216

Shutter=0.032ms

Gain=351 (87%)

Histogram=78%

proms:

FPS (avg.)=106

ROI=1936x1216

Shutter=0.582ms

Gain=351 (87%)

Histogram=100%

detuned surface:

FPS (avg.)=106

ROI=1936x1216

Shutter=0.032ms

Gain=302 (75%)

Histogram=80%

Mosaic

celestron 11" Edge HD, no barlow

ZWO ASI174MM

Baader film, IR/UV block filter, baader solar continuum filter

8/8/2024 23:46-23:49 UTC

20 second captures

best 20 pct

FPS (avg.)=103

Shutter=0.473ms

Gain=380 (95%)

Histogram=89%

close up

celestron 11" Edge HD, no barlow

ZWO ASI290MM

Baader film, 850 nm IR pass filter

8/10/2024 23:08 UTC

ROI=800x800

Shutter=0.056ms

Gain=311 (51%)

Histogramm=91%

East Bluff, CA

generally poor seeing :(

worse on the 8th-9th

4/8/24 solar eclipse epiphenomena

during totality, there is a twilight horizon for 360 degrees.  it's not pitch black, but approximates the darkness an hour after sunset.  you can still see things, though the colors are muted. 

twilight horizon during totality
13:52:11 local, max eclipse
russellville arkansas

fuzzy shadows:

shadows get a bit odd during the advanced partial phases.  note that the shadow of the right edge is sharp while the bottom edge is indistinct 

pin hole projection of partially eclipsed sun
right edge (parallel to crescent) sharp
bottom edge (perpendicular to crescent) fuzzy
1:41 PM, 11 minutes before totality

Inflicting the ritz cracker trick on neighboring families:

pinhole projection of partially eclipsed sun
through ritz cracker onto sky chart
(click image for full size)

i handed out packets of ritz and made friends with my "eclipse neighbors"

pinhole projection through pizza box
courtesy of neighboring family
(click image for full size)

eclipse neighbors
ritz crackers in hand
(click image for full size)

As you can see above, i had a white sheet set up for shadow bands, but did not see any.  though, for the last 30 seconds prior to totality i was tending to the camera, removing the solar filter etc. so may not have noticed.  

Wildlife

The mid-day darkness of an eclipse has been known to confuse local wild life.  while this video clip shortly after totality doesn't show much, you can hear crickets still chirping at darkness, while  young birds begin calling for food as they did at sunrise. (4/8/24 2:06:11 PM local--approximately 2 minutes after totality)

the cows did not moo

At first, i didn't think the cows did much, but on review of my pictures over the course of the day, it appears as though they started over to the left, perhaps by a barn or something, then moved out to the field to graze, later moving into the shade of trees during the midday sun.  during thinning crescent phases as the daylight faded and reddened, they seemed to move back to the left...maybe just random.

moo

i'm definitely not a cloud expert

the nature of cloud formation during a total eclipse gets fairly complex.  not sure i noticed any eclipse specific clouds, other than the thin line going right across the sun during totality :(

but i did notice an unusual difference after totality.  the sun moved across the sky from left to right.  the "pre-eclipse" clouds to the right look like typical poofy things, while the "post-eclipse" clouds to the left have a linear pattern.  This article suggests low level cumulus clouds dissipate during an eclipse due to altered convection, while thin high level clouds persist.

panorama
40 minutes after totality

Imaging details:

4/8/24 

Russellville, AR

35 deg 18.366 min N

93 deg 7.962  min W

solar transit 1:13:38 PM

totality ~1:50-1:54 PM local, alt 61 degrees

first contact 12:30:10 PM local

second contact (totality) 1:50:08 PM local,

third contact (end of totality) 1:54:15 PM local

fourth contact 3:10:50 PM local

samsung galaxy S22 ultra

4/8/24 solar eclipse travelogue, Russellville Arkansas

a thin cloud across the sun during totality didn't really interfere with the visual experience (photos another story).  i could easily see the black disk surrounded by a glowing ring of light, and colored prominences.  that being said, someone about 100 miles north along the track reported clear skies for totality :(

Thin cloud passing right in front of eclipsed sun. 
Russellville, Arkansas 4/8/2024
also note Venus (right) and Jupiter (left)

The first thing i did in planning for the 2024 eclipse was to find the location with the best chance of clear skies...

Bad news.  Based on historical data, the chance for clear skies was less than 50% across the entire US eclipse path, with the chance being best in the south and worse further north.  Furthermore, the weather patterns were such that large swathes of the path would be taken out all at once, so not easy to drive to clear skies.  

after hours combing through this website run by eclipsophile  meteorologist Jay Anderson, i came up with Kerrville Texas as the best location, with Russellville Arkansas as a back up, and Cleveland as a third (a friend from Cleveland talked me out of this one).  I booked refundable flights and rooms for both, making the final decision two days before the eclipse when weather models can be fairly accurate.  At that point the chance of heavy clouds was near 100% for southern texas and very low for arkansas. ironically maine, which a priori had the worst chance of clear skies wound up being the best:

weather satellite view of the eclipse shadow from 
pivotal weather.com

russellville seemed a pretty popular destination for the west coast

many people watched the eclipse from in front of the hotel where they were renting out parking spaces next to a lawn.  playing up to the event, the hotel gave out schwag bags including sun chips, capri sun, star burst, and eclipse gum...i had my own bud lite.  from there, they viewed the eclipse over the holiday inn--a great ad, but not the most scenic.  

after scouting a few locations in the area, i went back to my hotel and spotted a nice green pasture with a few cows right out back (seemed very Arkansas): 

eclipse scouting, holiday inn, Russellville AR

Will the cows moo at the moon covered sun?

more details:

samsung galaxy S22 ultra

detailed interactive eclipse path:

http://xjubier.free.fr/en/site_pages/solar_eclipses/TSE_2024_GoogleMapFull.html

also links to optimal exposure times

eclipse weather:

https://eclipsophile.com/2024tse/

weather in arkansas typically better slightly north of center line, hence russellville

last minute weather:

pivotal weather