from
https://www.space.com/iss-spacewalk-russian-equipment-jettison-june-2023

Russian cosmonauts toss old equipment overboard on ISS spacewalk
By Robert Z. Pearlman published about 18 hours ago
'Wave goodbye to it. Rest in peace.'

Comments (5)
cosmonaut Sergey Prokopyev discards an old science experiment during a
spacewalk, with the curve of earth visible in the background
Russian cosmonaut Sergey Prokopyev jettisons the Seismoprognoz, an
experiment that measured seismic activity on Earth for almost 10 years
from outside the International Space Station, during a spacewalk on June
22, 2023. The view is from a camera mounted on Prokopyev's spacesuit
helmet. (Image credit: NASA TV)
Two Russian cosmonauts spent six hours outside the International Space
Station on Thursday (June 22) cleaning up the exterior of the orbiting
laboratory by removing and tossing overboard a trio of no longer needed
devices, including a spent science experiment.

Expedition 69 commander Sergey Prokopyev and flight engineer Dmitry
Petelin, both of Russia's federal space corporation Roscosmos, exited
the space station's Poisk module at 10:24 a.m. EDT (1424 GMT) on Thursday.

In addition to jettisoning hardware, the spacewalk also included the
installation of a new stanchion for high-speed telemetry equipment and
the retrieval of a micrometeoroid impact experiment that had been
mounted outside the space station for a number of years.

Related: The most memorable spacewalks of all time in pictures

Click here for more Space.com videos...
Prokopyev and Petelin made quick work of rerouting cables and
disconnecting a data relay unit and a telemetry transmitter, as well as
the hardware for a completed experiment that measured seismic activity
on Earth, before throwing each overboard for their eventual disposal,
burning up in Earth's atmosphere.

"Wave goodbye to it," advised Mission Control Moscow, as Prokopyev
prepared to toss one of the items into space. "Rest in peace."

Russian cosmonauts Sergey Prokopyev and Dmitry Petelin are seen outside
of the International Space Station's Poisk module during a spacewalk on
June 22, 2023.

Russian cosmonauts Sergey Prokopyev and Dmitry Petelin are seen outside
of the International Space Station's Poisk module during a spacewalk on
June 22, 2023. (Image credit: NASA TV)
The experiment, called the Seismoprognoz, had been installed outside the
Zvezda service module during an Expedition 38 spacewalk on Dec. 27,
2013, almost 10 years ago. Like the communication units, the
Seismoprognoz was tossed off the back of the space station in a
direction that ensured that the gear could never make recontact with the
outpost.

The jettisons, which also included the stanchions (or "monoblocks") that
had held the equipment on Zvezda, made way for the installation of new
hardware, including a mono block for a new high-speed data unit that
Prokopyev and Petelin mounted on the module.

An outdated communications device is seen floating away from the
International Space Station after it was jettisoned by Russian
cosmonauts Sergey Prokopyev and Dmitry Petelin during a spacewalk on
June 22, 2023.

An outdated white, cylindrical communications device is seen floating
away from the International Space Station after it was jettisoned by
Russian cosmonauts Sergey Prokopyev and Dmitry Petelin during a
spacewalk on June 22, 2023. (Image credit: NASA TV)
The two spacewalkers also photo documented the condition of the plume
deflectors at the aft end of Zvezda service module for later analysis by
Russian engineers on the ground. The deflectors shield the station from
the plume of the module's engines. The inspection comes almost 23 years
after Zvezda was launched atop a Russian Proton rocket in July 2000.

"It looks like a dirty frying pan," said Prokopyev. "That could have
made some good fries in it."

"Well, it hasn't been washed for quite some time," replied Petelin.

The cosmonauts also captured high-resolution photography of the boom
upon which a high-data antenna is mounted at the very aft end of the
Zvezda service module.

The duo then moved to the opposite side of Zvezda to finish out their
tasks for this spacewalk. They cleaned one of the module's windows using
towels that they then also jettisoned and retrieved a final science
experiment, a biological sample exposure package, located near the hatch
to the Poisk airlock.

Russian cosmonaut Dmitry Petelin is seen at aft end of the Zvezda
service module outside of the International Space Station during a
spacewalk on June 22, 2023.

Russian cosmonaut Dmitry Petelin is seen at the aft end of the Zvezda
service module outside of the International Space Station during a
spacewalk on June 22, 2023. (Image credit: NASA TV)
RELATED STORIES:
— The most memorable spacewalks in history

— The International Space Station: Facts, history and tracking

— In photos: The amazing spacewalks of Expedition 61

The spacewalk ended at 4:48 p.m. EDT (2048 GMT) with Prokopyev and
Petelin back inside Poisk after working for 6 hours and 24 minutes in
the vacuum of space.

With the completion of Thursday's spacewalk, Prokopyev has now logged 48
hours and 40 minutes on seven extravehicular activities (EVAs). Petelin
has now conducted five spacewalks, all with Prokopyev, for a total time
of 33 hours and 9 minutes.

The EVA was the was the ninth this year and the 266th dedicated to the
assembly and maintenance of the International Space Station since 1998.

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Robert Z. Pearlman
collectSPACE.com Editor, Space.com Contributor
Robert Pearlman is a space historian, journalist and the founder and
editor of collectSPACE.com, an online publication and community devoted
to space history with a particular focus on how and where space
exploration intersects with pop culture. Pearlman is also a contributing
writer for Space.com and co-author of "Space Stations: The Art, Science,
and Reality of Working in Space” published by Smithsonian Books in 2018.
He previously developed online content for the National Space Society
and Apollo 11 moonwalker Buzz Aldrin, helped establish the space tourism
company Space Adventures and currently serves on the History Committee
of the American Astronautical Society, the advisory committee for The
Mars Generation and leadership board of For All Moonkind. In 2009, he
was inducted into the U.S. Space Camp Hall of Fame in Huntsville,
Alabama. In 2021, he was honored by the American Astronautical Society
with the Ordway Award for Sustained Excellence in Spaceflight History.

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Home News Spaceflight
Russian cosmonauts toss old equipment overboard on ISS spacewalk
By Robert Z. Pearlman published about 18 hours ago
'Wave goodbye to it. Rest in peace.'

Comments (5)
cosmonaut Sergey Prokopyev discards an old science experiment during a
spacewalk, with the curve of earth visible in the background
Russian cosmonaut Sergey Prokopyev jettisons the Seismoprognoz, an
experiment that measured seismic activity on Earth for almost 10 years
from outside the International Space Station, during a spacewalk on June
22, 2023. The view is from a camera mounted on Prokopyev's spacesuit
helmet. (Image credit: NASA TV)
Two Russian cosmonauts spent six hours outside the International Space
Station on Thursday (June 22) cleaning up the exterior of the orbiting
laboratory by removing and tossing overboard a trio of no longer needed
devices, including a spent science experiment.

Expedition 69 commander Sergey Prokopyev and flight engineer Dmitry
Petelin, both of Russia's federal space corporation Roscosmos, exited
the space station's Poisk module at 10:24 a.m. EDT (1424 GMT) on Thursday.

In addition to jettisoning hardware, the spacewalk also included the
installation of a new stanchion for high-speed telemetry equipment and
the retrieval of a micrometeoroid impact experiment that had been
mounted outside the space station for a number of years.

Related: The most memorable spacewalks of all time in pictures

Click here for more Space.com videos...
Prokopyev and Petelin made quick work of rerouting cables and
disconnecting a data relay unit and a telemetry transmitter, as well as
the hardware for a completed experiment that measured seismic activity
on Earth, before throwing each overboard for their eventual disposal,
burning up in Earth's atmosphere.

"Wave goodbye to it," advised Mission Control Moscow, as Prokopyev
prepared to toss one of the items into space. "Rest in peace."

Russian cosmonauts Sergey Prokopyev and Dmitry Petelin are seen outside
of the International Space Station's Poisk module during a spacewalk on
June 22, 2023.

Russian cosmonauts Sergey Prokopyev and Dmitry Petelin are seen outside
of the International Space Station's Poisk module during a spacewalk on
June 22, 2023. (Image credit: NASA TV)
The experiment, called the Seismoprognoz, had been installed outside the
Zvezda service module during an Expedition 38 spacewalk on Dec. 27,
2013, almost 10 years ago. Like the communication units, the
Seismoprognoz was tossed off the back of the space station in a
direction that ensured that the gear could never make recontact with the
outpost.

"a425couple" wrote in message news:NhplM.388$EuDd.149@fx02.iad...

from
https://www.space.com/iss-spacewalk-russian-equipment-jettison-june-2023

Russian cosmonauts toss old equipment overboard on ISS spacewalk
By Robert Z. Pearlman published about 18 hours ago
'Wave goodbye to it. Rest in peace.'

-----------------------

https://www.smithsonianmag.com/air-space-magazine/space-junk-180973982/

If thrown nearly straight backwards to the direction of travel it will lose
orbital velocity and its orbit will fall below the ISS. Then the small drag
of the residual atmosphere will slow and lower it further until it reenters.