Stella-Luna Observatory

@stellalunaobs.bsky.social

A personal observatory in Medina, Ohio. Interested in astronomy, solar observations, astronomy outreach, astrophotography, science.

The conclusion of a century-long quest 😲 Our VLT obtained firm evidence that Betelgeuse, a red supergiant star in the Orion constellation and one of the most famous stars in the night sky, is not alone! 🔭 🧪 1/4

A collage of various astronomical images. The background image shows a wide view of a starry night sky, with blue lines connecting the stars of the Orion constellation. An inset image zooms into the star Betelgeuse, showing its orange surface. A second inset shows a bright companion next to the star. Image by ESO/M. Montargès et al. Background: N. Rissinger (skysurvey.org).

The national synchrotron source, a laser facility and a particle accelerator are under threat of closure unless cash is found. Among the sites at risk looks to be the UK’s Jodrell Bank Observatory and its iconic Lovell radio telescope. www.nature.com/articles/d41...

The existential choice facing UK physics facilities: commercialize or close

The national synchrotron source, a laser facility and a particle accelerator are under threat of closure unless cash is found.

nature.com

Taking advantage of a respite between wildfire smoke and clouds, we set up the hydrogen-alpha solar telescope and captured some images. Seeing was remarkably good, considering the recent hubbub; while haze may have impacted transparency somewhat this morning, the atmosphere was steady.

A full disk image of the sun as recorded in hydrogen-alpha light. Several filament features are visible, and the solar rim is lined with numerous small prominences, spicules, and at about the three o'clock position on the disk, an impressive prominence. July 20, 2026This is an inverted (positive/negative) false-color view of the western Solar limb showing several filaments in detail, the roiling chromosphere, and an impressive prominence at the limb in the lower right-hand portion of this image. Recorded in hydrogen-alpha light, July 20, 2026. James Guilford

Dodging clouds, dealing with building heat, this image was worth the frustrations! This is the Waning Crescent Moon, 31% illuminated, at 11:05 AM EDT, July 9, via Askar 103APO telescope, ZWO ASI183MM Pro camera, IR Pass filter, processed in Pixelmator Pro. Yes, delighted!

Earth's Moon appears as a gray crescent against a black background in this image recorded during the daytime. A filter and a simple Levels adjustment in Pixelmator Pro produced the dramatic result. Lunar seas dominate the northern half of the image, while the heavily-cratered south is highlighted along the terminator.

Active Region 4455 exploded on 2026/06/02, with several flares sending multiple corornal mass ejections Earthward. This image, in hydrogen-alpha light, shows the Region with several white areas called plage, and a large sunspot. Lines and curves are magnetic field lines outlined in Solar plasma.

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Solar activity levels were officially reported to be at low levels but today's Sun was offering some excellent views. A large area of prominence activity on the southwest Solar limb was visually dominant. We were able to image earlier in the quiet morning today due to the higher Sun clearing trees!

Full disk image of Earth's Sun shows numerous prominences around the rim of the circle. A good-sized pointed prominence is located at about the 11 o'clock position while a large area of prominence activity is seen at about the 3:30 spot. Today only a few skinny filaments were occupying the solar disk. Sun in hydrogen-alpha light, May 28, 2026, monochrome image with false color applied.

“Keivan Stassun, a physicist and astronomer at Vanderbilt University, who has been a board member since 2022 said he had personally received confirmation from a third of the board members that they had been terminated by the boilerplate emails, which provided no reason.” wapo.st/3P3DSY2

Trump ousts National Science Board members

Members of the independent board that guides the National Science Foundation said they received a notice from the White House that their position was being terminated.

wapo.st

“International Dark Sky Week is hailed as a global celebration of the night and a call for less light pollution. In some cities internationally, local governments are trying to find a solution to lighting … better serve critical wildlife ecosystems and humans alike.” www.pbs.org/newshour/sho...

Cities turn streetlights red to protect nocturnal ecosystems

International Dark Sky Week is hailed as a global celebration of the night and a call for less light pollution. In some cities internationally, local governments are trying to find a solution to light...

pbs.org

Albert Einstein passed away #OTD in 1955 due to complications from a ruptured abdominal aneurysm. Doctors recommended surgical intervention but Einstein declined, saying “I have done my share; it is time to go. I will do it elegantly." Here is his office as he left it. 🧪 ⚛️ Image: R. Morse/LIFE

A black and white photo of Einstein’s desk, blackboard, and bookshelves after he passed away. Journals, magazine, and papers are strewn over the desk and shelves. A few of the shelves are organized, but mostly they contain haphazard, listing stacks that seem like they could fall over at any moment. The desk is a beautiful disaster, with papers and journals covering every inch. A pot for tobacco, a small glass jar, and Einstein’s pipe sit near the middle. The dark leather chair is pushed back slightly from the desk. The blackboard is sectioned off into several different regions, each of which contains one or more boxed formulas from whatever Einstein was working on when he fell ill.

Our Sun has been at low activity levels but that doesn't mean it has been without interesting features. Active Region 4419 has been providing the majority of flaring activity; its bright plages are caused by intense magnetic fields, also expressed in web-like shapes seen in the solar plasma.

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Partly to mostly sunny skies drew us to set up the solar scope this morning and Sun did not disappoint! This large prominence and dynamic filament offered interest and challenge. We also imaged a sunspot that is displaying its complex magnetic fields in the medium of solar plasma!#solarastronomy

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Our Sun has been busy, of late, even if we couldn't see it due to clouds. Saturday was sunny so we mounted the Sky-Watcher Heliostar on its Heliofinder mount (the pier was occupied) and captured some views. Prominences large and small were visible as were some very distinct filaments.

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Last night we finally had an opportunity to check out the C-11 in the observatory. The 24-year-old scope had languished in storage for a very long time after daytime collimation efforts without real world tests. The sky was mostly clear until, of course, we opened the dome. 1/2

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