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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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....

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

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

@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

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