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South Pole Telescope @sptelescope.bsky.social · 21/09/2026

Happy Sunrise at the #southpole #Antarctica this weekend! Officially it happens on the #equinox, but sunrise takes several days/weeks given the unique geographic location on Earth's axis. Pic by winterover Michel of sunrise behind the South Pole marker. @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 08/09/2026

Picture from winterover Michel of SPT this week. Still a couple weeks away until #sunrise, however you can still see the glow from below the horizon to the left of this image. Clear dark blue skies and great observing this past week. #LaborDay @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 03/09/2026

A picture from winterover Michel on the walk back from SPT to the station last week. That building in the distance is the @uw_icecube lab (ICL). Still a few weeks from #sunrise, but sky is getting noticeably brighter on the horizon. @doescience @NSF #Antarctica #southpole

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South Pole Telescope @sptelescope.bsky.social · 02/09/2026

New SPT-3G D1 CMB lensing maps, likelihoods, and cosmological chains, all are publicly available linked through the SPT website and @NASA_LAMBDA. Go to this data products page for more details: pole.uchicago.edu/public/data/... @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 01/09/2026

New SPT-3G D1 CMB lensing measurement and cosmological constraints! "Our lensing power spectrum yields the tightest constraint on σ8Ω 0.25 m from CMB lensing alone to date, at 1.6% precision." @NSF @doescience #southpole @UChicago arxiv.org/abs/2608.31136

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South Pole Telescope @sptelescope.bsky.social · 27/08/2026

Another picture this week from winterover Michel during telescope greasing this week. Continuing to get brighter out, but nearly full moon is the brightest thing in the sky, and still incredibly clear winter #southpole skies! @doescience @NSF #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 24/08/2026

About 1-month until #sunrise at the #southpole, and the sky is getting brighter. And no, that is the #moon above SPT, but still dark enough to see some meteors and #aurora. Pic by winterover Michel. @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 19/08/2026

Another great @Apple #iphone picture last week from Anjali! A picture of SPT observing, with the Milky Way and southern lights overhead, and several streaking meteors visible. #Antarctica @doescience @NSF

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South Pole Telescope @sptelescope.bsky.social · 17/08/2026

Picture from winterover Anjali, posing in front of the telescope with one of the unofficial mascots of the #southpole station, a stuffed animal penguin from the gift shop. Only about 1-month until #surise at Pole! #Antarctica @doescience @NSF

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South Pole Telescope @sptelescope.bsky.social · 13/08/2026

Cool picture of Michel greasing the outside gears of the telescope, which the winterovers have to do every 2-weeks. Seems like the lens might have started icing up a bit during this picture, creating a glow around the telescope. Pic by Anjali. @doescience @NSF #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 10/08/2026

Still dark enough outside to get some spectacular views of the South Pole #aurora, even with a regular @Apple #iphone and with #sunrise about 6-weeks away. Picture from winterover Anjali during last week, while greasing the telescope. @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 04/08/2026

Another amazing picture from winterover Anjali this week of the clear deep blue skies over SPT! Its also definitely getting brighter out, less than 2 months until official #sunrise at the #southpole #Antarctica! @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 03/08/2026

July is the last month of darkness at the #southpole, the skies are noticeably getting brighter. Still time for some #aurora, here is a pic from winterover Anjali showing some during the walk from station to the Dark Sector (with a person walking in distance) @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 27/07/2026

SPT Winterover Michel took this amazing picture, showing the walk out from #southpole station to the dark sector. The moon light and ice crystals on the horizon have a fog-like appearance with the flags and red-lights marking the trail. @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 23/07/2026

Another great picture from winterover Anjali of the great weather and clear skies at the #southpole this week! Picture of SPT with the red night vision light on with the #milkyway in the background. #Antarctica @NSF @doescience @uchicagomag.bsky.social

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South Pole Telescope @sptelescope.bsky.social · 20/07/2026

Weather has been great this week at the #southpole! Multiple days of below -100 deg F weather, which has meant really clear skies and great observing! Picture from winterover Anjali of SPT and BICEP with the #milkyway galaxy overhead. #Antarctica @NSF @doescience #Genesis

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South Pole Telescope @sptelescope.bsky.social · 08/07/2026

This time of year is a great time for #southpole pictures, including this one from Anjali, showing the deep blue skies right now! You can really see the ice and snow buildup on and around the building by mid-winter. #Antarctica #NSF #DOEScience

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South Pole Telescope @sptelescope.bsky.social · 06/07/2026

The new SPT-3G cluster catalog from our 5-year Main survey data set is now publicly available at: pole.uchicago.edu/public/Home.... In total, 8,892 cluster candidates detected in 1,604.8 deg2 of sky, with 25% of the confirmed sample at z > 1! #Antarctica #NSFfunded #DOEfunded

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South Pole Telescope @sptelescope.bsky.social · 02/07/2026

New SPT-3G cluster catalog! arxiv.org/abs/2607.01175 "the sample consists of 8,892 cluster candidates .. 1,780 clusters are at z>1 and 271 at z>1.5 .. the sample is significantly deeper, with a cluster density of 4.5 confirmed clusters/deg2" @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 30/06/2026

South Pole Telescope SPT-3G collaboration at @UChicagoPSD this week! Great seeing everyone and mapping out the future of SPT! @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 29/06/2026

Full moon as viewed from the South Pole this week during an afternoon walk out from station to DSL, pic by winterover Michel! Nice moon dog around the moon also provides nice contrast to see the landscape on the walk to the telescope. @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 16/06/2026

Happy Midwinter from the South Pole! This weekend, the station celebrated "mid-winter", intended to approximately align with the Summer #solstice. Here is the station's official midwinter greeting, a pic taken when it was -98d F and -128d F windchill outside! @vrubinobs.bsky.social

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South Pole Telescope @sptelescope.bsky.social · 12/06/2026

Recent pic of the southern lights #aurora above the #southpole marker with the @NSF Amundsen-Scott South Pole station in the background. Pic by SPT winterover Michel @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 08/06/2026

A picture of SPT and DSL from winterover Michel last week, with the moon starting to set. Even with the moon up and the red night vision lights on, you can still see the #aurora southern lights. @NSF @doescience #Antarctica #southpole

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South Pole Telescope @sptelescope.bsky.social · 03/06/2026

During the full moon a few days ago, SPT winterover Michel also captured this great pic of the moon behind the #southpole marker and ceremonial flags. The moon peaks at 28.7-deg elevation and is a full moon at its peak during the June solstice. #Antarctica @doescience @NSF

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South Pole Telescope @sptelescope.bsky.social · 02/06/2026

Only a few weeks away from mid-winter, during the solstice on June-21. Weather has been unseasonably warm at #southpole, getting as high as -42 deg Fahrenheit last week. Here is a pic from winterover Michel, of SPT and DSL, lit by the moonlight. @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 04/05/2026

Roughly 6 weeks after $Sunset and we are in the darkest time of winter, here is a photo from winterover Michel of a nearly fully moon over the SPT this weekend! Observing weather has been great recently, with consistently dry clear skies #southpole #Antarctica @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 01/05/2026

A pic from Site Manager Gavin Reynolds from a couple weeks ago during a full moon. View is from a back stairwell on station looking towards the station power plant, which is generating the smoke plume and about 30-feet below the main station. @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 22/04/2026

Getting dark quickly at the #southpole now, roughly 1-month past #Sunset, and our winterovers are starting to see some signs of Southern Lights! Below is a pic from Michel using his iphone walking back from the telescope this week. @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 20/04/2026

Nearly a month after Sunset, its much darker at the #southpole, but you can still see a little twilight on the horizon with a medium exposure on an #iphone. Here is a pic from winterover Michel towards the Dark Sector on the walk out to SPT. #Antarctica @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 13/04/2026

Pic by Winterover Anjali of SPT, about 2-weeks after #Sunset, even with the Sun several degrees below the horizon there is still a light glow in its direction. Great observing weather recently too, as you can also see in this pic. #Antarctica @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 09/04/2026

Another pic by winterover Michel. Taken from the station looking SPT and DSL, which are 1-km away, and small in the distance roughly below the nearly full moon. The view shows how featureless the landscape is at #southpole. #Antarctica @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 08/04/2026

The South Pole ceremonial marker, pic by winterover Michel. Still bright enough to see a little bit of Sun on the horizon in the reflection off the marker, but the moon is the brightest thing in the sky right now. #Antarctica @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 06/04/2026

About 2-weeks after #sunset at the South Pole, our winter overs Michel and Anjali are getting some great views of the darkening skies. Here SPT and DSL are being backlight by a nearly full moon. #Antarctica @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 31/03/2026

Another pic from last week of #southpole #Sunsets, by winterover Anjali, this time looking from the station towards the Dark Sector and SPT. Its 1-km distance between this pic location and SPT, with the sastrugi well lit by the backlight. @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 30/03/2026

Picture of SPT obserivng last week, with the Sun finally almost fully below the horizon. Since then the Sun has fully set, and #southpole winter has begun and SPT began 2026 observations of its 1500d Main field! @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 25/03/2026

New SPT-3G D1 data release, providing maps and ancillary data products from the first two years of the Main survey, now public on the SPT website! @doescience @NSF #Antarctica pole.uchicago.edu/public/Home....

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South Pole Telescope @sptelescope.bsky.social · 25/03/2026

Another pic last week by winterover Michel, showing the view out to DSL, but this time with the Sun behind the camera still only a degree above the horizon. On top of DSL, the BICEP calibration source is reflecting the Sun back towards the camera. #Antarctica @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 23/03/2026

The Sun has set at the #southpole since we are past the #equinox. However, last week, this was one of the last pictures taken by winterover Michel of the Sun spiraling towards the horizon in the direction of SPT and DSL buildings. @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 18/03/2026

@argonne Postdoc Wei Quan presenting at APS today about the new SPT-3G D1 map release! New paper is public on the SPT website here: pole.uchicago.edu/public/Home.... @NSF @doescience #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 17/03/2026

Only four days until #sunset with SPT still looking #golden with the setting Sun. The moon is also up right now at the South Pole, visible at low elevation in the distance, near where SPT is currently observing. Pic by winterover Anjali. #Antarctica @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 16/03/2026

Within a week of #sunset at the #southpole. Pic by winterover Anjali with SPT looking #golden backlight by the Sun, which is now only about 1.5 degrees above the horizon. We will start our Main survey observations later this week after Sunset. @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 13/03/2026

Cloudy earlier this week at #southpole. Pic from Michel of SPT & DSL, with the newly installed winter flag line from DSL back to station. On the roof, can also see the 20-ft tall BICEP calibration tower, which will be coming down this week before #sunset. @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 12/03/2026

With the Sun getting low in the horizon there are lots of nice pictures like this from winterover Michel, the ice crystals in the air creating a #sundog, the backlight showing the #sastrugi and the flag line to @uw_wipac ICL building leading to the right. @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 09/03/2026

SPT observing last week (picture by SPT winterover Michel!) Less than 2-weeks away from #sunset at the #southpole, with the Sun about 5 degrees above the horizon. The sky is dry & clear enough in summer that we continue to take science observations ! @NSF @doescience

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South Pole Telescope @sptelescope.bsky.social · 02/03/2026

Even though @NSF #southpole station "officially" closed for winter, last week 2 final twin otter flights stopovered at Pole before heading North! They mainly serve other bases on station, wrapping up work a couple weeks after the last LC130s. Pic by Anjali. #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 25/02/2026

One of the annual #southpole traditions at the start of winter is watching John Carpenter's #thething in the gym. A fitting start to over 8 months of isolation for the 40 winterovers after becoming officially stranded at a remote Antarctic base! #Antarctica

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South Pole Telescope @sptelescope.bsky.social · 16/02/2026

"Last flight" of the official #southpole Austral summer has taken off and winter has begun! SPT is now in charge of the capable hands of Wwinterovers Anjali and Michel for the next 8.5 months! Pic by Anjali . @NSF @doescience #Antarctica #WinterOlympicGames

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South Pole Telescope @sptelescope.bsky.social · 14/02/2026

New SPT-3G paper and data release! "SPT-3G D1: Compton-y maps using data from the SPT-3G and Planck surveys" @doescience @NSF arxiv.org/abs/2602.11279 #Antarctica #southpole

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South Pole Telescope @sptelescope.bsky.social · 11/02/2026

New SPT-3G paper! "Measurement of the Full Shape of the Thermal Sunyaev-Zel’dovich Power Spectrum from South Pole Telescope and Herschel-SPIRE Observations" that finds the "tSZ power spectrum measured at 9.3σ in both MV and CIB-min maps." arxiv.org/pdf/2602.10107 @NSF #southpole

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