Tootfinder

The limits of #cosmology: #telescopes that we can dream about, at wavelengths spanning decimetric radio through optical to terahertz FIR. [...] Here I will set out my vision of the case for #LunarAstronomy over the next several decades."

Feedback-Controlled Beam Pattern Measurement Method Using a Power-Variable Calibration Source for Cosmic Microwave Background Telescopes
Haruaki Hirose, Masaya Hasegawa, Daisuke Kaneko, Taketo Nagasaki, Ryota Takaku, Tijmen de Haan, Satoru Takakura, Takuro Fujino
https://arxiv.org/abs/2509.09386

Feedback-Controlled Beam Pattern Measurement Method Using a Power-Variable Calibration Source for Cosmic Microwave Background Telescopes
We demonstrate a novel beam pattern measurement method for the side lobe characterization of cosmic microwave background telescopes. The method employs a power-variable artificial microwave source under feedback control from the detector under test on the telescope. It enables us to extend the dynamic range of the beam pattern measurement without introducing nonlinearity effects from the detector. We conducted a laboratory-based proof-of-concept experiment, measuring the H-plane beam pattern of…

Unraveling the Secrets of the lower Solar Atmosphere: One year of Operation of the Solar Ultraviolet Imaging Telescope (SUIT) on board Aditya-L1
Rahul Gopalakrishnan, Soumya Roy, Deepak Kathait, Janmejoy Sarkar, Nived V. N., Durgesh Tripathi, A. N. Ramaprakash, Sami K. Solanki, Sreejith Padinhatteeri, Mahesh Burse, Rushikesh Deogaonkar, Sakya Sinha, Adithya H. N., K. Sankarasubramanian, Dipankar Banerjee, Dibyendu Nandy, Srikant Motamarri, Amit Purohit, Rethika T, Sreenath K R, Priyank…

Unraveling the Secrets of the lower Solar Atmosphere: One year of Operation of the Solar Ultraviolet Imaging Telescope (SUIT) on board Aditya-L1
The Solar Ultraviolet Imaging Telescope (SUIT) is an instrument onboard Aditya--L1, the first solar space observatory of the Indian Space Research Organization (ISRO), India, launched on September 2, 2023. SUIT is designed to image the Sun in the 200--400 nm wavelength band in eight narrowband and three broadband filters. SUIT's science goals start with observing the solar atmosphere and large-scale continuum variations, the physics of solar flares in the NUV region, and many more. The paper el…

Pre-perihelion radio observations of comet 12P/Pons-Brooks with Tianma radio telescope
Juncen Li, Xian Shi, Jianchun Shi, Yuehua Ma, Bin Yang, Jian-Yang Li, Zexi Xing, Man-To Hui, Zhen Wang, Ruining Zhao
https://arxiv.org/abs/2508.06936

Pre-perihelion radio observations of comet 12P/Pons-Brooks with Tianma radio telescope
{The multiple outburst events of comet 12P/Pons-Brooks during its 2024 apparition offer a unique window into highly-active volatile releasing processes not observable during quiescent periods. We performed radio observations of comet 12P/Pons-Brooks with the Tianma-65m radio telescope, targeting the OH and NH$_3$ inversion lines at 18-cm and 1.3-cm, respectively. By monitoring 12P at different heliocentric distances on its inbound journey, we aim to provide insights into the comet's volatile co…

Unveiling IPv6 Scanning Dynamics: A Longitudinal Study Using Large Scale Proactive and Passive IPv6 Telescopes
Hammas Bin Tanveer, Wai Sun Chan, Ricky K. P. Mok, Sebastian Kappes, Philipp Richter, Oliver Gasser, John Ronan, Arthur Berger, kc Claffy
https://arxiv.org/abs/2508.07506

Unveiling IPv6 Scanning Dynamics: A Longitudinal Study Using Large Scale Proactive and Passive IPv6 Telescopes
We introduce new tools and vantage points to develop and integrate proactive techniques to attract IPv6 scan traffic, thus enabling its analysis. By deploying the largest-ever IPv6 proactive telescope in a production ISP network, we collected over 600M packets of unsolicited traffic from 1.9k Autonomous Systems in 10 months. We characterized the sources of unsolicited traffic, evaluated the effectiveness of five major features across the network stack, and inferred scanners' sources of target a…

How to see two bright, once-in-a-lifetime comets with your naked eye
The comets, C/2025 A6 (Lemmon) and C/2025 R2 (SWAN), are already showing off their green tails to cameras and telescopes.
But the best chances to see them with the naked eye from the northern hemisphere should be in the second half of the month.

“What stands out about these two is their potential brightness,” said Erika Gibb, an astrobiologist at the University of Missouri-St. Louis.
“For sky-gaz…

How to see two bright, once-in-a-lifetime comets with your naked eye
Comet Lemmon and Comet SWAN will be closest to Earth as a new moon sets up prime viewing conditions. Add in a meteor shower and we may get spectacular sky gazing.

Today is a day for getting rid of things. Just gave away my old 8" Dobsonian telescope to the local astronomy club. Junk haulers next. Best feeling.

SKYSURF VIII -- Modeling SKYSURF Completeness Data for Comparison to the Hubble Space Telescope Exposure Time Calculator
Zachary Goisman (Arizona State University School of Earth and Space Exploration, Arizona State University School of Electrical and Computer Engineering), Timothy Carleton (Arizona State University School of Earth and Space Exploration), Seth H. Cohen (Arizona State University School of Earth and Space Exploration), Delondrae Carter (Arizona State University School of…

SKYSURF VIII -- Modeling SKYSURF Completeness Data for Comparison to the Hubble Space Telescope Exposure Time Calculator
Accurately assessing image source completeness is critical for interpreting measurements on telescope data. Using the Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys (ACS) data from the Hubble Space Telescope ($HST$) archival project "SKYSURF", we model galaxy completeness as a function of the exposure time and background of an image. This is accomplished by adding simulated objects with varying magnitudes and sizes into these images, and determining the detection rate for each set o…

Our solar system’s interstellar interloper, 3I/ATLAS,
showed strong ultraviolet emissions that are unmistakable telltales of hydroxyl gas (OH), a byproduct of water,
when astronomers imaged it with the with NASA’s Neil Gehrels Swift space telescope before it disappeared behind the Sun.
Their findings, detailed in a new studypublished in The Astrophysical Journal Letters, argue that the presence of all this OH indicates
the comet is ejecting water vapor at a torrentia…

Calibration and Performance Validation of the SST-1M Telescopes Using Crab Nebula Observations
Thomas Tavernier, Jakub Jury\v{s}ek, Vladimir Novotny
https://arxiv.org/abs/2508.08861

Calibration and Performance Validation of the SST-1M Telescopes Using Crab Nebula Observations
SST-1M is a prototype single mirror Small Sized Cherenkov Telescope designed for very high energy (VHE) gamma-ray astronomy. With a 4 meter primary mirror and a 5.6 meter focal length, it provides a wide 9 degree optical field of view, optimized for detecting VHE gamma-rays from 1 TeV to several hundred TeV. Its focal plane is equipped with DigiCam, a fully digital trigger and readout camera made of 1296 silicon photomultiplier (SiPM) pixels. The use of SiPM sensors enables observation under hi…