| Asteroid |
Date(UT) |
Miss Distance |
Velocity (km/s) |
Diameter (m) |
| 2026 UP3 |
2026-Oct-26 |
5.7 LD |
7.6 |
27 |
| 2026 TB94 |
2026-Oct-27 |
5.1 LD |
11.6 |
26 |
| 2026 UN3 |
2026-Oct-27 |
1 LD |
21.8 |
11 |
| 2026 UD2 |
2026-Oct-27 |
2.9 LD |
10.8 |
12 |
| 2026 UO3 |
2026-Oct-27 |
11.3 LD |
9.3 |
18 |
| 2026 UQ3 |
2026-Oct-27 |
1.8 LD |
12 |
15 |
| 2026 UF2 |
2026-Oct-28 |
5.3 LD |
16 |
59 |
| 2018 GS1 |
2026-Oct-28 |
11.1 LD |
9.3 |
108 |
| 2026 UB1 |
2026-Oct-28 |
9.6 LD |
18.7 |
40 |
| 2026 UE2 |
2026-Oct-29 |
0.3 LD |
7.7 |
5 |
| 2022 UV21 |
2026-Oct-29 |
14.8 LD |
9.6 |
13 |
| 2026 UC2 |
2026-Oct-29 |
2.7 LD |
13.9 |
23 |
| 2026 UB2 |
2026-Oct-29 |
1.2 LD |
7.5 |
15 |
| 2026 UD |
2026-Oct-30 |
11.6 LD |
7.7 |
25 |
| 2025 UK9 |
2026-Oct-31 |
0.8 LD |
7.8 |
4 |
| 524522 |
2026-Nov-02 |
15.7 LD |
8.7 |
277 |
| 2021 VC4 |
2026-Nov-03 |
6 LD |
11.2 |
15 |
| 2017 WJ2 |
2026-Nov-05 |
14.7 LD |
12 |
118 |
| 2016 VZ1 |
2026-Nov-05 |
20 LD |
13.5 |
21 |
| 2001 KF54 |
2026-Nov-06 |
18.9 LD |
16.4 |
391 |
| 2026 UX |
2026-Nov-07 |
19.6 LD |
9.7 |
38 |
| 2025 UF5 |
2026-Nov-09 |
18.9 LD |
1.9 |
10 |
| 2015 VH65 |
2026-Nov-10 |
9.7 LD |
8 |
10 |
| 2012 YD7 |
2026-Nov-10 |
18.6 LD |
7.5 |
49 |
| 2023 VF3 |
2026-Nov-11 |
8.5 LD |
8.8 |
19 |
| 2022 MP2 |
2026-Nov-13 |
19.8 LD |
3.8 |
23 |
| 2025 VG5 |
2026-Nov-13 |
18.2 LD |
4.9 |
16 |
| 2026 UY |
2026-Nov-14 |
19.7 LD |
4.3 |
64 |
| 2023 VE6 |
2026-Nov-17 |
18.4 LD |
10.1 |
13 |
| 2019 WT1 |
2026-Nov-18 |
19.7 LD |
9.7 |
16 |
| 2018 NE1 |
2026-Nov-19 |
16.7 LD |
13.3 |
74 |
| 2026 TB84 |
2026-Nov-19 |
12.1 LD |
9.9 |
68 |
| 2025 CP1 |
2026-Nov-30 |
12.9 LD |
10.8 |
6 |
| 2019 XF2 |
2026-Dec-04 |
3.1 LD |
10.2 |
14 |
| 2023 XH3 |
2026-Dec-06 |
18.7 LD |
16.5 |
14 |
| 2020 XC3 |
2026-Dec-08 |
14.5 LD |
14.3 |
110 |
| 2016 NV |
2026-Dec-08 |
14.3 LD |
10.4 |
379 |
| 2010 VQ |
2026-Dec-12 |
4.6 LD |
4.3 |
10 |
| 2025 XN6 |
2026-Dec-12 |
6.9 LD |
12.2 |
5 |
| 2026 QQ8 |
2026-Dec-13 |
3.5 LD |
0.8 |
2 |
| 2026 LZ1 |
2026-Dec-14 |
14.4 LD |
11.2 |
36 |
| 2025 YN |
2026-Dec-18 |
18.3 LD |
13.1 |
21 |
| 2018 FQ4 |
2026-Dec-19 |
16.7 LD |
10.4 |
14 |
| 2021 PF7 |
2026-Dec-26 |
15.5 LD |
7.7 |
10 |
Notes: LD means
"Lunar Distance." 1 LD = 384,401 km, the distance
between Earth and the Moon. 1 LD also equals 0.00256
AU.
| |
Cosmic Rays in the Atmosphere |
SPACE WEATHER BALLOON DATA: Almost once a week, Spaceweather.com and the students of Earth to Sky Calculus fly space weather balloons to the stratosphere over California. These balloons are equipped with sensors that detect secondary cosmic rays, a form of radiation from space that can penetrate all the way down to Earth's surface. Our monitoring program has been underway without interruption for 10 years, resulting in a unique dataset of in situ atmospheric measurements.
Latest results (Nov. 2024): Atmospheric radiation is sharply decreasing in 2024. Our latest measurements in November registered a 10-year low:
What's going on? Ironically, the radiation drop is caused by increasing solar activity. Solar Cycle 25 has roared to life faster than forecasters expected. The sun's strengthening and increasingly tangled magnetic field repels cosmic rays from deep space. In addition, solar coronal mass ejections (CMEs) sweep aside cosmic rays, causing sharp reductions called "Forbush Decreases." The two effects blend together to bring daily radiation levels down.
.Who cares? Cosmic rays are a surprisingly "down to Earth" form of space weather. They can alter the chemistry of the atmosphere, trigger lightning, and penetrate commercial airplanes. According to a study from the Harvard T.H. Chan school of public health, crews of aircraft have higher rates of cancer than the general population. The researchers listed cosmic rays, irregular sleep habits, and chemical contaminants as leading risk factors. A number of controversial studies (#1, #2, #3, #4) go even further, linking cosmic rays with cardiac arrhythmias and sudden cardiac death.
Technical notes: The radiation sensors onboard our helium balloons detect X-rays and gamma-rays in the energy range 10 keV to 20 MeV. These energies span the range of medical X-ray machines and airport security scanners.
Data points in the graph labeled "Stratospheric Radiation" correspond to the peak of the Regener-Pfotzer maximum, which lies about 67,000 feet above central California. When cosmic rays crash into Earth's atmosphere, they produce a spray of secondary particles that is most intense at the entrance to the stratosphere. Physicists Eric Regener and Georg Pfotzer discovered the maximum using balloons in the 1930s and it is what we are measuring today.
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the
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