| Asteroid |
Date(UT) |
Miss Distance |
Velocity (km/s) |
Diameter (m) |
| 2026 HR |
2026-Apr-27 |
16.6 LD |
7.6 |
22 |
| 2026 HJ3 |
2026-Apr-27 |
16.2 LD |
7.1 |
26 |
| 2026 GU1 |
2026-Apr-28 |
12.4 LD |
6.4 |
75 |
| 2026 HW |
2026-Apr-28 |
9.6 LD |
11.8 |
35 |
| 2026 HR5 |
2026-Apr-28 |
0.7 LD |
7 |
8 |
| 2026 HP3 |
2026-Apr-29 |
15.5 LD |
11.3 |
29 |
| 2026 HL3 |
2026-Apr-29 |
6.7 LD |
8.6 |
25 |
| 2026 HX3 |
2026-May-01 |
8.1 LD |
11.4 |
21 |
| 2026 HY3 |
2026-May-01 |
7.2 LD |
9 |
18 |
| 2026 HZ3 |
2026-May-01 |
4 LD |
8.4 |
31 |
| 2026 GW3 |
2026-May-02 |
13.9 LD |
5.8 |
21 |
| 2026 HM6 |
2026-May-02 |
3.8 LD |
18.4 |
14 |
| 2026 HA3 |
2026-May-02 |
5.1 LD |
12.1 |
48 |
| 2026 HD3 |
2026-May-02 |
8.4 LD |
11.5 |
20 |
| 2026 HL6 |
2026-May-02 |
6.2 LD |
20.5 |
24 |
| 2026 HE2 |
2026-May-03 |
15.5 LD |
6.6 |
24 |
| 2026 GD1 |
2026-May-03 |
14.6 LD |
6.6 |
48 |
| 2026 HK4 |
2026-May-05 |
11 LD |
20.3 |
23 |
| 2026 HN1 |
2026-May-06 |
9.2 LD |
14.2 |
65 |
| 2026 HA4 |
2026-May-07 |
4.1 LD |
9 |
20 |
| 2026 HY2 |
2026-May-07 |
5 LD |
9 |
34 |
| 2026 HD2 |
2026-May-08 |
17.7 LD |
10.7 |
43 |
| 2020 GE3 |
2026-May-09 |
11.1 LD |
5.9 |
21 |
| 2023 VR5 |
2026-May-16 |
7.5 LD |
2.3 |
10 |
| 2026 HC5 |
2026-May-17 |
7.1 LD |
6.7 |
21 |
| 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 |
| 2026 HW2 |
2026-May-29 |
17.7 LD |
12.5 |
127 |
| 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 |
| 2016 VS |
2026-Jun-12 |
20 LD |
11.1 |
12 |
| 530520 |
2026-Jun-12 |
16.1 LD |
14.6 |
152 |
| 2003 LN6 |
2026-Jun-18 |
3.7 LD |
3.9 |
41 |
| 2025 WC4 |
2026-Jun-21 |
10.2 LD |
19.2 |
304 |
| 2015 LM24 |
2026-Jun-22 |
18.2 LD |
13.8 |
71 |
| 152637 |
2026-Jun-27 |
6.7 LD |
8.9 |
947 |
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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The
first place to look for information about sundogs,
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Researchers
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is the most advanced solar observatory ever. |
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3D
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Realtime
and archival images of the Sun from SOHO. |
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information about sunspots based on the latest NOAA/USAF Active Region Summary |
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current counts of failed and deployed Starlink satellites from Jonathan's Space Page. See also, all satellite statistics. |
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Authoritative predictions of space junk and satellite re-entries |
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from
the NOAA Space Environment Center |
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fun to read, but should be taken with a grain of salt! Forecasts looking ahead more than a few days are often wrong. |
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from the NOAA Space Environment Center |
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the
underlying science of space weather |
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