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RASC Calgary Centre @calgaryrasc.bsky.social · 10h

The one-day-past #FullMoon through thin clouds. #astronomy

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RASC Calgary Centre @calgaryrasc.bsky.social · 11h

Thank you!

Reposted by RASC Calgary Centre

The Weather Network @weathernetwork.bsky.social · 15h

Eyes to the northern skies tonight for a chance to spot the Aurora Borealis!

https://ow.ly/34ue50X845O

The Northern Lights may shine across parts of Canada Tuesday night - The Weather Network

Eyes to the northern skies for a chance to spot the Aurora Borealis.

ow.ly

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Reposted by RASC Calgary Centre

RASC Calgary Centre @calgaryrasc.bsky.social · 1d

Rise of the #HarvestMoon with the Belt of Venus (the shadow of the Earth on the atmosphere). #astronomy

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RASC Calgary Centre @calgaryrasc.bsky.social · 1d

Rise of the #HarvestMoon with the Belt of Venus (the shadow of the Earth on the atmosphere). #astronomy

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Reposted by RASC Calgary Centre

Astrogeo 🇨🇦🇺🇦 @astrogeo.bsky.social · 1d

Today on the @CBCEyeopener with host @LorenMcGinnis, I mentioned the Full Moon tonight occurs near perigee (or closest point to Earth in its orbit). Some refer to this as a Supermoon but it is better known as the “Harvest Moon”. These photos were recorded after sunset looking ENE on October 6.

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Reposted by RASC Calgary Centre

RASC Calgary Centre @calgaryrasc.bsky.social · 2d

100 Ma old crater Tycho and its extensive bright ejecta ray pattern dominate the southern hemisphere of the nearly full #Moon. #astronomy

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Reposted by RASC Calgary Centre

Scott Kardel aka Palomar Skies @palomarskies.bsky.social · 2d

Comet C/2025 A6 (Lemmon) as seen this morning. I kind of feel the black and white version brings out more detail in its tail. #comet 🔭

A telescopic view of stars and a blue-green comet. The comet has a wispy dust tail that extends up and to the left.

A black and white version of the previous image of the comet showing its tail extending upward and to the left.

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Reposted by RASC Calgary Centre

Alan Dyer @amazingskyguy.bsky.social · 2d

Two versions, with and without labels, of an odd and obscure nebula off the beaten path of the Milky Way, in Lacerta. With the better known nebulas of Cygnus in frame for comparison.

Taken at the Southern Alberta Star Party.

Details in the Alt Text.

The "Great Lacerta Nebula" is catalogued as Sharpless 2-126, and also as LBN (Lynds Bright Nebula) 428, though the Sharpless designation seems to apply just to the 2º-long lower southerly section of it near the blue star 10 Lacertae which is thought to be illuminating the nebula. However, the full size of the nebula extends much farther north making it 4º to 5º long. And it seems to be connected to a dark dusty tail extending to the right. The Lacerta Nebula is about 1200 light years away.

At far right is the bright North America Nebula, NGC 7000. To the left of it is the Pelican Nebula, IC 5070. To the left of the North America are the faint arcs of the Clamshell Nebula, Sharpless 2-119.

At top centre is the small round Cocoon Nebula, IC 5146, at the end of the Dark Cigar Nebula, B168. To the left of the Cocoon is the open star cluster NGC 7209 in Lacerta. Above it and also in Lacerta but a bit lost here is the star cluster NGC 7243. The stars of Lacerta zig-zag down the frame at left.

At top right above the North America is the long dark Funnel Cloud Nebula, LeGentil 3.

The field of view here is about 30º by 20º.

Technical:
This is a blend of:
- A stack of 40 x 90-second exposures through a broadband NiSi Natural Night 95mm filter, at ISO 800.
- A stack of 58 x 90-second exposures through an Astronomik dual-narrowband UHC-B clip-in filter, at ISO 1600.
- So a total of about 2.5 hours of exposure.
- All with the Canon RF28-70mm lens at 70mm and at f/2 on the astro-modified Canon Ra camera. And on the MSM Nomad tracker for tracked but not guided exposures.

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Reposted by RASC Calgary Centre

Alan Dyer @amazingskyguy.bsky.social · 2d

This is the complex of nebulas on the border of Cassiopeia and Cepheus called the Question Mark Nebula. It is made of NGC 7822, Ced214 and Sharpless 2-170 making the dot of the question mark.
Taken at the Southern Alberta Star Party in the Alberta Cypress Hills.
Details in the Alt Text.

$This is the complex array of nebulas collectively known as the Question Mark Nebula, for obvious reasons perhaps! However, in processing the image to bring out the most nebulosity, the question mark form has become a bit lost! The complex is made of: - the top arc, which is officailly NGC 7822 or Sharpless 2-171, - the middle roundish nebula catalogued as Cederblad 214, - and the isolated "dot" of the question mark below, which is Sharpless 2-170, but is also known as the Little Rosette Nebula. The field at bottom is laced with lots of faint bits of red hydrogen-alpha nebulosity. And some small round and blue reflection nebulas lie below the main emission nebulas, notably van den Bergh 2 (vdB2) at left. The nebulas lie on the Cassiopeia-Cepheus border with the top nebulas in Cassiopeia and the Little Rosette across the border in Cepheus. Several star clusters are in the field: - King 11 is off the top right edge of NGC 7822, looking yellowed by dust absorption, - Below and amid the NGC 7822 nebulosity is Berkeley 59 above the bright blue star - King 1 is far to the left of Sh2-170 at lower left The field of view is 7.8º by 5.2º. Technical: This is a blend of exposures: a set through a specialized narrowband flilter, and exposures taken unfiltered — - 10 x 10 minutes at ISO 3200 through an IDAS NBZ filter which isolates just the emission lines from green oxygen and red hydrogen in nebulas, - 10 x 5 minutes at ISO 800 without a filter for a broadband "white light" view. - All through the Askar SQA55 astrographic refractor at f/4.9 and with the astro-modified Canon EOS R camera. On the Star Adventurer GTi mount autoguided with the MGEN3 stand-alone autoguider.$

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Reposted by RASC Calgary Centre

Bob Riddle @currentsky.bsky.social · 2d

Check out my latest post about comet c2025 A6 (Lemmon).

starwalk.substack.com/p/a-comet-an...

A Comet & the Full Moon

Measuring the comets movement - despite the Moon!

starwalk.substack.com

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Reposted by RASC Calgary Centre

Simeon Schmauß @stim3on.bsky.social · 3d

Last night, NASA's Perseverance rover looked up at the night sky once more, to capture interstellar #comet 3I/Atlas flying by the red planet.

The distance was "only" 0.2 AU or 30 Mio km, far closer than the comet ever got to Earth. 🔭 #3IAtlas

Credit: NASA/JPL-Caltech/ASU/Simeon Schmauß

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RASC Calgary Centre @calgaryrasc.bsky.social · 2d

100 Ma old crater Tycho and its extensive bright ejecta ray pattern dominate the southern hemisphere of the nearly full #Moon. #astronomy

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RASC Calgary Centre @calgaryrasc.bsky.social · 2d

After an overnight layover due to rain yesterday evening, it looks like the migratory #birds at Golden Prairie are on the wing Sunday once things warmed up a bit. #skstorm.

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RASC Calgary Centre @calgaryrasc.bsky.social · 3d

It’s been a while since I heard this. 😜

RASC Calgary Centre @calgaryrasc.bsky.social · 3d

It’s also great that @calgaryresponse.bsky.social and Bird Friendly Calgary are here.

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RASC Calgary Centre @calgaryrasc.bsky.social · 3d

A key factor for the success of this event is our partnership with the Friends of Fish Creek PP and other like-minded groups such as @albertabats.bsky.social , Ann&Sandy Cross Conservation Area and the The Weaselhead Preservation Society

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RASC Calgary Centre @calgaryrasc.bsky.social · 3d

Despite the clouds, our fall star night @ Fish Creek Provincial Park is well attended with lots of indoor activities. #astronomy

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RASC Calgary Centre @calgaryrasc.bsky.social · 3d

Despite the clouds, our fall star night @ Fish Creek Provincial Park is well attended with lots of indoor activities.

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RASC Calgary Centre @calgaryrasc.bsky.social · 3d

Migratory #birds getting stopped by rain showers to their south and turning around near Golden Prairie. #skstorm

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RASC Calgary Centre @calgaryrasc.bsky.social · 3d

It looks like cooler weather has reinvigorated migratory #birds in their southward travels. Large flocks seen here on weather RADAR moving from Barrhead to Tofield in the Edmonton region Saturday. #abstorm

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Reposted by RASC Calgary Centre

lights out for migrating birds @lightsoutforbirds.bsky.social · 4d

fall is the deadliest season for migrating birds. to help stop the poor birds from hitting windows, keep lights out 11pm to 6am and make windows bird safe flap.org

Melissa Breyer @melissabreyer.bsky.social · May 20

Window collision #2337, scarlet tanager; Bklyn, NY, May 2, 2025. I find window-struck migratory birds in such a haunting array of conditions and poses; but this one was especially sad. I can’t help but wonder what her last few minutes of life were like. Data + body to @nycbirdalliance.bsky.social

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RASC Calgary Centre @calgaryrasc.bsky.social · 3d

Every social media thread is elevated by a Billy Van gif!

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Salva Bará @salvabara.bsky.social · 4d

ENLIGHT International Conference on Light Pollution and Dark Sky Protection

Abstract Submission Deadline – October 10th, 2025.

www.enlightproject.rs/enlight-conf...

ENLIGHT - ENLIGHT Conference

Welcome to the ENLIGHT Conference!

www.enlightproject.rs

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RASC Calgary Centre @calgaryrasc.bsky.social · 5d

Was that on one of the mane paths? 😜

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