416 citations
- Kyoto UniversityJP49 papers
- National Astronomical Observatory of JapanJP44 papers
- Crimean Astrophysical ObservatoryUA30 papers
- British Astronomical AssociationGB24 papers
- Vihorlat ObservatorySK22 papers
- Nordic Optical TelescopeES21 papers
- American Association of Variable Star ObserversUS20 papers
- Hiroshima UniversityJP20 papers
- The University of TokyoJP19 papers
- University of TurkuFI18 papers
- Kazan Federal UniversityRU17 papers
- Lomonosov Moscow State UniversityRU17 papers
159 papers
Multi-Sensor Trajectory Reconstruction of the 24 April 2025 Alaska Fireball and Implications for Planetary Defense
L. T. Scamfer, E. A. Silber, M. D. Fries +6
On 24 April 2025 at 18:30:57 UTC, a bright daytime fireball over Southcentral Alaska was detected by 37 seismic stations, 16 single infrasound sensors, and four infrasound arrays,…
PALM: PAnoramic Learning Map Integrating Learning Analytics and Curriculum Map for Scalable Insights Across Courses
Mahiro Ozaki, Li Chen, Shotaro Naganuma +3
This study proposes and evaluates the PAnoramic Learning Map (PALM), a learning analytics (LA) dashboard designed to address the scalability challenges of LA by integrating curricu…
Some inequalities for spectral geometric mean with applications
Shigeru Furuichi, Yuki Seo
Recently, the spectral geometric mean has been studied by some papers. In this paper, we firstly estimate the Hölder type inequality of the spectral geometric mean of positive inve…
A wiggling filamentary jet at the origin of the blazar multi-wavelength behaviour
C. M. Raiteri, M. Villata, M. I. Carnerero +96
Blazars are beamed active galactic nuclei known for their strong multi-wavelength variability on timescales from years down to minutes. We aim to investigate the suitability of the…
On the need of an ultramassive black hole in OJ 287
Mauri J. Valtonen, Staszek Zola, Achamveedu Gopakumar +25
The highly variable blazar OJ~287 is commonly discussed as an example of a binary black hole system. The 130 year long optical light curve is well explained by a model where the ce…
Observational Implications of OJ 287's Predicted 2022 Disk Impact in the Black Hole Binary Model
Mauri J. Valtonen, Lankeswar Dey, Achamveedu Gopakumar +24
We present a summary of the results of the OJ 287 observational campaign, which was carried out during the 2021/2022 observational season. This season is special in the binary mode…