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Anonymous ID: da2696 Jan. 7, 2023, 6:56 a.m. No.18097644   🗄️.is 🔗kun

NASA Astronomy Picture of the Day

Jan 7 2023

 

Space Stations in Low Earth Orbit

 

On January 3, two space stations already illuminated by sunlight in low Earth orbit crossed this dark predawn sky. Moving west to east (left to right) across the composited timelapse image China's Tiangong Space Station traced the upper trail captured more than an hour before the local sunrise. Seen against a starry background Tiangong passes just below the inverted Big Dipper asterism of Ursa Major near the peak of its bright arc, and above north pole star Polaris. But less than five minutes before, the International Space Station had traced its own sunlit streak across the dark sky. Its trail begins just above the W-shape outlined by the bright stars of Cassiopeia near the northern horizon. The dramatic foreground spans an abandoned mine at Achada do Gamo in southeastern Portugal.

 

https://apod.nasa.gov/apod/astropix.html

Anonymous ID: da2696 Jan. 7, 2023, 7:05 a.m. No.18097682   🗄️.is 🔗kun   >>7784 >>8034 >>8250

Retired NASA Earth Radiation Budget Satellite to Reenter Atmosphere

 

In early January NASA’s retired Earth Radiation Budget Satellite (ERBS) is expected to reenter Earth’s atmosphere after almost four decades in space. For 21 of those years, the ERBS actively investigated how the Earth absorbed and radiated energy from the Sun, and made measurements of stratospheric ozone, water vapor, nitrogen dioxide, and aerosols.

 

As of Thursday, Jan. 5, the Department of Defense predicted that the 5,400-pound satellite will reenter the atmosphere at approximately 6:40 p.m. EST on Sunday, Jan. 8 with an uncertainty of +/- 17 hours. NASA and the Defense Department will continue to monitor the reentry and update the predictions.

 

NASA expects most of the satellite to burn up as it travels through the atmosphere, but some components are expected to survive the reentry. The risk of harm coming to anyone on Earth is very low – approximately 1 in 9,400.

 

Launched from the Space Shuttle Challenger on Oct. 5, 1984, the ERBS spacecraft was part of NASA’s three-satellite Earth Radiation Budget Experiment (ERBE) mission. It carried three instruments, two to measure the Earth's radiative energy budget, and one to measure stratospheric constituents, including ozone.

 

The energy budget, the balance between the amount of energy from the Sun that Earth absorbs or radiates, is an important indicator of climate health, and understanding it can also help reveal weather patterns. Ozone concentrations in the stratosphere play an important role in protecting life on Earth from damaging ultraviolet radiation.

 

ERBS far exceeded its expected two-year service life, operating until its retirement in 2005. Its observations helped researchers measure the effects of human activities on Earth’s radiation balance. NASA has continued to build on the success of the ERBE mission with projects including the current Clouds and the Earth’s Radiant Energy System (CERES) suite of satellite instruments.

 

The Stratospheric Aerosol and Gas Experiment II (SAGE II) on the ERBS made stratospheric measurements. SAGE II collected important data that confirmed the ozone layer was declining on a global scale. That data helped shape the international Montreal Protocol Agreement, resulting in a dramatic decrease around the globe in the use of ozone-destroying chlorofluorocarbons. Today, SAGE III on the International Space Station collects data on the health of the ozone layer.

 

https://www.nasa.gov/feature/langley/retired-nasa-earth-radiation-budget-satellite-to-reenter-atmosphere