South Pole Telescope
@sptelescope.bsky.social
A 10-meter diameter sub-mm wavelength telescope observing the cosmic microwave background from the South Pole, Antarctica.
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
February 11, 2026 at 5:52 AM
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
Last week, the South Pole celebrated a wedding! This marks the fourth time in recorded station history for a couple to be married at the #southpole. Pic by SPT winterover Michel. #Antarctica #wedding @NSF
February 11, 2026 at 12:03 AM
Last week, the South Pole celebrated a wedding! This marks the fourth time in recorded station history for a couple to be married at the #southpole. Pic by SPT winterover Michel. #Antarctica #wedding @NSF
Last week a contingent of @NSF representatives and six US Senators from @SenateCommerce @commercedems visited the #southpole, getting a tour of the science on station, including SPT's very own Sasha Rahlin and Winterover Anjali Sehrawat! @doescience
February 3, 2026 at 12:28 AM
Last week a contingent of @NSF representatives and six US Senators from @SenateCommerce @commercedems visited the #southpole, getting a tour of the science on station, including SPT's very own Sasha Rahlin and Winterover Anjali Sehrawat! @doescience
"First constraints on causal sources of primordial gravitational waves from CMB B-mode data" SPT-3G helps break degeneracies between Inflationary, lensing, and causal sources of B-modes to provide first constraints! #southpole @doescience @NSF arxiv.org/abs/2601.20958
February 2, 2026 at 5:10 PM
"First constraints on causal sources of primordial gravitational waves from CMB B-mode data" SPT-3G helps break degeneracies between Inflationary, lensing, and causal sources of B-modes to provide first constraints! #southpole @doescience @NSF arxiv.org/abs/2601.20958
New SPT-3G constraints on CMB secondary anisotropies, including the thermal and kinematic SZ effect! "At ℓ=3000, we find thermal SZ power at 143 GHz of DtSZ=4.91±0.37μK2 and kinematic SZ power of DkSZ=1.75±0.86μK2" @NSF #southpole #Antarctica arxiv.org/abs/2601.20551
January 30, 2026 at 12:14 AM
New SPT-3G constraints on CMB secondary anisotropies, including the thermal and kinematic SZ effect! "At ℓ=3000, we find thermal SZ power at 143 GHz of DtSZ=4.91±0.37μK2 and kinematic SZ power of DkSZ=1.75±0.86μK2" @NSF #southpole #Antarctica arxiv.org/abs/2601.20551
Picture of the @uw_icecube Upgrade team photo this season! Congrats to IceCube collaboration for a successful upgrade deployment this season! @NSF #southpole #Antarctica
January 28, 2026 at 11:51 PM
Picture of the @uw_icecube Upgrade team photo this season! Congrats to IceCube collaboration for a successful upgrade deployment this season! @NSF #southpole #Antarctica
Interesting history from Josh Frieman about
@theDESurvey: "In 2003, we started thinking about how to do (DES) .. a major motivation was a new cosmic microwave background telescope being built at the South Pole - the South Pole Telescope" phys.org/news/2026-01...
@theDESurvey: "In 2003, we started thinking about how to do (DES) .. a major motivation was a new cosmic microwave background telescope being built at the South Pole - the South Pole Telescope" phys.org/news/2026-01...
What is the universe made of? Experts weigh in on the mysterious force that shapes our cosmic history
As the Dark Energy Survey (DES) releases its final results, we caught up with two physicists who've been involved in the project from its early days. In this Q&A, Josh Frieman, DES co-founder and ...
phys.org
January 28, 2026 at 11:47 PM
Interesting history from Josh Frieman about
@theDESurvey: "In 2003, we started thinking about how to do (DES) .. a major motivation was a new cosmic microwave background telescope being built at the South Pole - the South Pole Telescope" phys.org/news/2026-01...
@theDESurvey: "In 2003, we started thinking about how to do (DES) .. a major motivation was a new cosmic microwave background telescope being built at the South Pole - the South Pole Telescope" phys.org/news/2026-01...
Nice article by @doescience summarizing the recent SPT-3G result by Yujie Wan, which discovered two flaring objects near the #Galactic center! @NSF @NSF_NSB #southpole www.energy.gov/science/arti...
Spotting Astrophysical Discoveries at the Bottom of the World
The South Pole Telescope has gathered new data on cosmic flares from white dwarf stars, demonstrating its unique capabilities.
www.energy.gov
January 22, 2026 at 10:38 PM
Nice article by @doescience summarizing the recent SPT-3G result by Yujie Wan, which discovered two flaring objects near the #Galactic center! @NSF @NSF_NSB #southpole www.energy.gov/science/arti...
Exciting new result from SPT-3G by Yujie Wan from Illinois! Detection of transient white dwarves, near the Galactic center!
@NSF #Antarctica #southpole
www.ncsa.illinois.edu/2026/01/20/r...
@NSF #Antarctica #southpole
www.ncsa.illinois.edu/2026/01/20/r...
January 20, 2026 at 4:18 PM
Exciting new result from SPT-3G by Yujie Wan from Illinois! Detection of transient white dwarves, near the Galactic center!
@NSF #Antarctica #southpole
www.ncsa.illinois.edu/2026/01/20/r...
@NSF #Antarctica #southpole
www.ncsa.illinois.edu/2026/01/20/r...
The happy 13 participants in the South Pole marathon this weekend! Pic by Kurt Studt, taken right before the start. #Antarctica #southpole #marathon
@NSF
@NSF
January 13, 2026 at 10:20 PM
The happy 13 participants in the South Pole marathon this weekend! Pic by Kurt Studt, taken right before the start. #Antarctica #southpole #marathon
@NSF
@NSF
This past weekend was the annual #southpole marathon! Since 2011, the marathon has been run annually in January (yes, outside!), usually consisting of 6-8 loops around station. All-time record is 4hrs02min by Ricky Gates in 2011! Pic by Michel Adamic. #Antarctica @NSF
January 12, 2026 at 11:45 PM
This past weekend was the annual #southpole marathon! Since 2011, the marathon has been run annually in January (yes, outside!), usually consisting of 6-8 loops around station. All-time record is 4hrs02min by Ricky Gates in 2011! Pic by Michel Adamic. #Antarctica @NSF
One of the big summer infrastructure projects is digging of a new intermediate sewer outfall tunnel. Here is a pic from Rich Overbeck earlier this summer early on in the project. #Antarctica #soutpole
@NSF
@NSF
January 12, 2026 at 9:49 PM
One of the big summer infrastructure projects is digging of a new intermediate sewer outfall tunnel. Here is a pic from Rich Overbeck earlier this summer early on in the project. #Antarctica #soutpole
@NSF
@NSF
Yes, that would be fine!
January 6, 2026 at 8:02 PM
Yes, that would be fine!
On New Years Day at the #southpole, there is a ceremony to move the geographic South Pole (since the ice underneath the station moves about 10-meters per year) and a reveal of a new marker on top of the Pole. See some pics by Anjali from this years ceremony. #Antarctica @NSF
January 5, 2026 at 4:39 PM
On New Years Day at the #southpole, there is a ceremony to move the geographic South Pole (since the ice underneath the station moves about 10-meters per year) and a reveal of a new marker on top of the Pole. See some pics by Anjali from this years ceremony. #Antarctica @NSF
Happy Holidays! The #Christmas Day picture from the @NSF Amundsen-Scott South Pole station! Picture by Michael Rayne. #Antarctica #southpole
December 30, 2025 at 12:46 AM
Happy Holidays! The #Christmas Day picture from the @NSF Amundsen-Scott South Pole station! Picture by Michael Rayne. #Antarctica #southpole
December 19, 2025 at 3:55 PM
Three days after launch, the GAPS (dark matter) balloon is doing well. Waiting for PUEO to launch, the balloon facility webcam is still capturing interesting activity: a LC-130 on deck and an Emperor penguin in the foreground @NASA #Antarctica www.csbf.nasa.gov/antarctica/p...
December 18, 2025 at 10:53 PM
Three days after launch, the GAPS (dark matter) balloon is doing well. Waiting for PUEO to launch, the balloon facility webcam is still capturing interesting activity: a LC-130 on deck and an Emperor penguin in the foreground @NASA #Antarctica www.csbf.nasa.gov/antarctica/p...
Group photo of the SPT team at #southpole this season: Adam, Matt, Sasha, Michel, Anjali, and Nick! (Kyra not pictured!). We have a light season this year, doing some work on SPT-SLIM but otherwise observing all Austral summer!
@NSF
#Antarctica
@NSF
#Antarctica
December 15, 2025 at 8:53 PM
Group photo of the SPT team at #southpole this season: Adam, Matt, Sasha, Michel, Anjali, and Nick! (Kyra not pictured!). We have a light season this year, doing some work on SPT-SLIM but otherwise observing all Austral summer!
@NSF
#Antarctica
@NSF
#Antarctica
It launched! 15-in in the air thus far. Ended up being the GAPS experiment, PUEO is up next! www.csbf.nasa.gov/antarctica/p...
CSBF Antarctica Operations
www.csbf.nasa.gov
December 15, 2025 at 4:54 PM
It launched! 15-in in the air thus far. Ended up being the GAPS experiment, PUEO is up next! www.csbf.nasa.gov/antarctica/p...
Looking promising that someone might launch today from McMurdo balloon facility! Seems likely that it's Pueo. Follow at: www.csbf.nasa.gov/antarctica/p... #Antarctica #NASA #neutrinos
December 15, 2025 at 3:50 PM
Looking promising that someone might launch today from McMurdo balloon facility! Seems likely that it's Pueo. Follow at: www.csbf.nasa.gov/antarctica/p... #Antarctica #NASA #neutrinos
New results showing constraints on cosmic inflation using the latest CMB & BAO data sets, including SPT-3G temperature and polarization power spectra from this year! Also with public likelihood on Github! arxiv.org/abs/2512.10613 @NSF @doescience
December 12, 2025 at 1:50 PM
New results showing constraints on cosmic inflation using the latest CMB & BAO data sets, including SPT-3G temperature and polarization power spectra from this year! Also with public likelihood on Github! arxiv.org/abs/2512.10613 @NSF @doescience
Exciting times in McMurdo for the @NASA balloon payloads! This season, the GAPS and PUEO experiments are scheduled to launch, looks like GAPS is doing a "hang test", one of the last tests that is done before launch! Follow progress at: www.csbf.nasa.gov/antarctica/p...
December 10, 2025 at 9:44 PM
Exciting times in McMurdo for the @NASA balloon payloads! This season, the GAPS and PUEO experiments are scheduled to launch, looks like GAPS is doing a "hang test", one of the last tests that is done before launch! Follow progress at: www.csbf.nasa.gov/antarctica/p...
The first South Pole Overland Traverse (SPOT) of the season arrived at the #southpole this week! There are three traverses that travel between McMurdo and Pole each season, which bring about 75% of the fuel in each season. Pic by Michael Rayne. #Antartica @NSF
December 10, 2025 at 4:02 AM
The first South Pole Overland Traverse (SPOT) of the season arrived at the #southpole this week! There are three traverses that travel between McMurdo and Pole each season, which bring about 75% of the fuel in each season. Pic by Michael Rayne. #Antartica @NSF
New measurements from @NOAA measurements @NSF
South Pole Amundsen-Scott Station about the Ozone hole. Article includes an amazing picture from SPT winterover Sim Bash! #Antarctica #southpole t.co/NaWOSPanNa
South Pole Amundsen-Scott Station about the Ozone hole. Article includes an amazing picture from SPT winterover Sim Bash! #Antarctica #southpole t.co/NaWOSPanNa
https://www.noaa.gov/news-release/noaa-nasa-2025-ozone-hole-is-5th-smallest-since-1992
t.co
November 25, 2025 at 4:14 PM
New measurements from @NOAA measurements @NSF
South Pole Amundsen-Scott Station about the Ozone hole. Article includes an amazing picture from SPT winterover Sim Bash! #Antarctica #southpole t.co/NaWOSPanNa
South Pole Amundsen-Scott Station about the Ozone hole. Article includes an amazing picture from SPT winterover Sim Bash! #Antarctica #southpole t.co/NaWOSPanNa
Bad visibility at the #southpole this weekend, see side by side pic by IceCube Kurt that shows the walk to SPT and dark sector over the past few days! This only happens a couple days per year, but thats why they have the flag line along the path! @NSF #Antarctica #whiteout
November 24, 2025 at 9:03 PM
Bad visibility at the #southpole this weekend, see side by side pic by IceCube Kurt that shows the walk to SPT and dark sector over the past few days! This only happens a couple days per year, but thats why they have the flag line along the path! @NSF #Antarctica #whiteout