| Asteroid |
Date(UT) |
Miss Distance |
Velocity (km/s) |
Diameter (m) |
| 2011 FT9 |
2026-Apr-07 |
3.4 LD |
5.9 |
20 |
| 2026 GG |
2026-Apr-07 |
12.6 LD |
14.2 |
27 |
| 2024 TB7 |
2026-Apr-07 |
4.9 LD |
7.5 |
5 |
| 2002 TB70 |
2026-Apr-07 |
13.4 LD |
9.2 |
164 |
| 2026 GJ |
2026-Apr-07 |
14 LD |
17.1 |
16 |
| 2026 GE |
2026-Apr-08 |
0.5 LD |
10.8 |
7 |
| 2026 GY |
2026-Apr-08 |
4.1 LD |
5.3 |
7 |
| 2026 GB1 |
2026-Apr-09 |
16.3 LD |
15.7 |
49 |
| 2026 GT1 |
2026-Apr-09 |
2.9 LD |
11.2 |
20 |
| 2026 GD |
2026-Apr-09 |
0.7 LD |
12.7 |
17 |
| 2022 GE2 |
2026-Apr-10 |
12 LD |
9.2 |
15 |
| 2026 GY1 |
2026-Apr-10 |
2.9 LD |
10.1 |
32 |
| 2026 GW |
2026-Apr-10 |
3.7 LD |
8.5 |
10 |
| 2026 FE7 |
2026-Apr-11 |
8.9 LD |
7.8 |
29 |
| 2026 GC |
2026-Apr-11 |
13.6 LD |
8.2 |
37 |
| 2026 GR1 |
2026-Apr-12 |
0.9 LD |
6.7 |
10 |
| 2023 HB4 |
2026-Apr-12 |
16.8 LD |
8.7 |
15 |
| 2026 FV6 |
2026-Apr-13 |
7.5 LD |
11.2 |
29 |
| 2026 GW1 |
2026-Apr-13 |
3.1 LD |
13.6 |
15 |
| 2026 GX1 |
2026-Apr-14 |
13.1 LD |
4.7 |
16 |
| 2013 GM3 |
2026-Apr-14 |
0.7 LD |
7.4 |
20 |
| 2026 FX13 |
2026-Apr-14 |
7.1 LD |
11.7 |
29 |
| 2026 GT |
2026-Apr-16 |
11.7 LD |
16 |
18 |
| 2026 GA1 |
2026-Apr-17 |
12.2 LD |
7.8 |
20 |
| 2026 FJ6 |
2026-Apr-18 |
15.8 LD |
9.8 |
90 |
| 2026 GM1 |
2026-Apr-18 |
3.5 LD |
5.6 |
28 |
| 2026 AC4 |
2026-Apr-20 |
10.7 LD |
1.2 |
22 |
| 2022 UG2 |
2026-Apr-20 |
16.3 LD |
10.3 |
13 |
| 2026 GJ1 |
2026-Apr-21 |
8.7 LD |
22.3 |
69 |
| 2025 HQ4 |
2026-Apr-21 |
16.4 LD |
12.5 |
22 |
| 2026 BK2 |
2026-Apr-22 |
10 LD |
8.1 |
219 |
| 2022 UU8 |
2026-Apr-25 |
8.7 LD |
4 |
9 |
| 2026 GU1 |
2026-Apr-28 |
12.5 LD |
6.4 |
75 |
| 2026 GD1 |
2026-May-03 |
14.6 LD |
6.7 |
51 |
| 2020 GE3 |
2026-May-09 |
11.1 LD |
6 |
21 |
| 2023 VR5 |
2026-May-16 |
7.5 LD |
2.3 |
10 |
| 2025 KR4 |
2026-May-18 |
15.2 LD |
5.9 |
22 |
| 2023 KH4 |
2026-May-24 |
5.5 LD |
7.9 |
14 |
| 2023 KZ1 |
2026-May-24 |
9 LD |
13.4 |
20 |
| 2023 BM4 |
2026-May-30 |
12.2 LD |
5.7 |
64 |
| 2021 KN2 |
2026-Jun-03 |
8.9 LD |
8.9 |
7 |
| 2018 GE |
2026-Jun-07 |
16.4 LD |
3.1 |
11 |
Notes: LD means
"Lunar Distance." 1 LD = 384,401 km, the distance
between Earth and the Moon. 1 LD also equals 0.00256
AU.
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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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