Christian Fröschlin

Amateur astronomer from urban 15th floor balcony, Celestron 8'' + Galileoscope. Software developer. Image processing / HALCON. Fledgling skeptic. He/him.

Christian Fröschlinchrfrde
2025-05-13

Tonight's pass over The Hague. 12 x 0.15 ms unfiltered mono in Celestron 8" at f/10.

Mono view of ISS against black background. Direction of movement is up and slightly to the left. The modules show up as a bright center line next to the radiator as a bright rectangular grid. Perpendicular is the main truss with four largers solar panel however in this high overhead pass they are seen nearly edge-on and appear inconspicuous being both thin and dark.
Christian Fröschlinchrfrde
2025-05-13

@sunumbral Some people do shoot simply with DSLR + telelens with pretty good results.

Christian Fröschlinchrfrde
2025-05-13

@sunumbral You need large binoculars and good eyes to see more a dot I think. I have a cheap pair of 10 x 50 I need to use with glasses to achieve focus and I didn't get enough visual quality out of it to unambigously see the shape.

Christian Fröschlinchrfrde
2025-05-12

@jesusmargar once you have a pass there are different techniques I record video aiming manually then after the pass you collect frames with hits. This is a stack of 30 images.

Christian Fröschlinchrfrde
2025-05-12

@jesusmargar iss shots you always have to plan but of course the orbit is well known you can check when you have passes on sites like heavens-above.com/

Christian Fröschlinchrfrde
2025-05-12

This evening's pass over The Hague. 31 x 0.25 ms unfiltered mono in Celestron 8" at f/10.

White ISS against black background. The central axis with the main modules shows somewhat splotchy and partially overexposed structures. Above and below four large solar panels appear darker but still well illuminated in this perspective. Direction of movement is toward the left.
Christian Fröschlinchrfrde
2025-05-12

The classic genre of high-rise balcony fish photography. 1/250 sec EOS 400D in 300mm/f4.0 lens.

Close grouping of five or six large fish (probably carps) in greenish canal water. One of them appears brighter and more clearly visible due to viewing and lighting angle as well as depth. The others are either darker or more fuzzy.
Christian Fröschlinchrfrde
2025-05-06

Evolution of sunspot group AR 4079 over the last 3 days. Each 500 x 0.15-0.17 ms OD 3.8 solar foil + longpass red in Celestron 8" at f/10. mastodon.social/@chrfrde/11444

Christian Fröschlinchrfrde
2025-05-03

Also here is today's in Ha. 1000 x 0.8 ms Ha < 0.7 Å in Lunt 40 at f/10.

Full disk view of the Sun. The interior show various dark filaments and AR 4079 to the upper left. In contrast to the white light image this shows bright structures in addition to the matching dark sunspot cores. The exterior is processed separately and reveals several prominences.
Christian Fröschlinchrfrde
2025-05-03

I haven't done much white light solar imaging since got a dedicated solar Ha scope but in honor of AR 4079 here is a sunspot closeup on today's Sun. 500 x 0.15 ms OD 3.8 solar foil + longpass red in Celestron 8" at f/10.

Monochromatic view of light granulated photosphere featuring darker "hairy" sunspots with black featureless cores. Somewhat below and right of center is a very large spot with a split double core. A smaller isolated spot is visible at the top left. In between is an irregular smear of some darker regions with a sprinkling of many tiny black specks.
Christian Fröschlinchrfrde
2025-05-02

@DavidBflower Huh looks just like the Moon over here

Christian Fröschlinchrfrde
2025-05-02

This evening's waxing crescent 32.5% illuminated. Single shot 1/30 sec EOS 400D in Celestron 8" + 0.63x reducer.

Thick "bowl-like" crescent phase. The bright, crisp and circular lunar edge is to the lower right. The dark terminator showing craters and shadows points to the upper left. The solid lit portion shows albedo feature like darker Mare.
Christian Fröschlinchrfrde
2025-04-30

This evening's with Europa shadow transit and to scale now at 6.6 arcsec apparent diameter. Respectively 1000 x 15 ms and 2000 x 10 ms RGB in Celestron 8" + 0.63 reducer + ADC.

Composite of two planet images against black background. On the left the large circular disk of Jupiter with alternating white and brownish bands and a small black dot near the left limb. On the right a tiny reddish Mars with two large dark regions as well as the bright north pole clearly visible. Also Mars show some phase at 90% illumination.
Christian Fröschlinchrfrde
2025-04-30

This evening's waxing crescent 13% illuminated with and without Earthshine. 30 ms / 4 sec EOS 400D in Celestron 8" + 0.63x reducer.

Gray lunar crescent roughly banana-thick with horns pointing to the upper left against fully black background. Dark smooth mare crisium is prominent on the terminator with the peaks of its rim already lit beyond the terminator.Full lunar disk against hazy background. The actual lit crescent appears fully white and overexposed to the lower right. Mare and ray systems as they appear on the full moon are visible on the dark side but here illuminated only by reflected light from Earth. To the upper right the magnitude 8 star HD 35586 appears as a small white dot about a minute before being occulted.
Christian Fröschlinchrfrde
2025-04-21

Time lapse of from last weekend covering 3 hours of real time. 128 x 2000 x 0.9 ms Ha < 0.7 Å in Lunt 40 at f/10.

Christian Fröschlinchrfrde
2025-03-24

There are a few bats living here that come out at dusk and flutter about near my balcony. Very tricky to shoot since it is getting dark quickly and they move fast. I essentially reverted to ISS techniques running video hoping for one to fly through at a distance not too different from random focus.

Black and white composite image showing multiple views of the same bat in different poses dark against a gray sky as it crosses the image diagonally from upper left to lower right
Christian Fröschlinchrfrde
2025-03-18

Quick shot of this evening prior to the ISS pass with three nearby moons. 1000 x 12 ms Ha unfiltered mono in Celestron 8".

Black and white view of Jupiter as small banded disk in the center of a black image. Europa and Ganymede appear as two dots on the upper left, Io as a single dot on the lower right.
Christian Fröschlinchrfrde
2025-03-18

Comparison with a capture taken 10 seconds earlier

Christian Fröschlinchrfrde
2025-03-18

This evening's pass over The Hague. Crew-10 Dragon is still present since astronauts are currently returning in Crew-9. It think the view today provides just enough resolution to reveal the tapering nose cone. 29 x 0.1 ms unfiltered mono in Celestron 8" at f/10.

Telescopic view of ISS against black background. Direction of movement in this image appears at an angle 45 degree towards the top left. Solar panels are dimly visible but foreshortened being seen at a steep angle. Crew-10 Dragon capsule docked at the forward port appears as a bright elongated object borderline resolved to show a bit of tapering at the nose.
Christian Fröschlinchrfrde
2025-03-17

This evening's pass over The Hague. The Crew-10 Dragon that docked Sunday morning is clearly visible at the forward docking port of the Harmony module. 16 x 0.2 ms unfiltered mono in Celestron 8" at f/10.

Telescopic view of ISS seen mainly from below in a high overhead pass. The main truss appears horizontal in this image and rather dim, the solar panels are not prominent as they are seen edge-on. The perpendicular chain of modules is brighter. The two most prominent bright features two radiators. At the "top" is the forward facing harmony module with Crew-10 dragon attached that appears as a bright elongated spot.

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