Arianespace launches European radar satellite
The commercial arm of the European Space Agency, Arianespace, yesterday successfully launched Europe’s Sentinel-1D radar satellite, its Ariane-6 rocket lifting off from France’s French Guiana spaceport.
As noted here,
The 2,184-kilogram Sentinel-1D satellite is a twin of Sentinel-1C, which was launched aboard a Vega C rocket in December 2024. Given that the Ariane 62 can deliver more than 10 tonnes to low Earth orbit, launching the 2.3-tonne Sentinel-1D on a dedicated flight appears excessive, particularly as its twin was launched on a Vega C rocket.
Officials claimed the reason was a need to get the satellite in orbit because one in orbit had failed, and because of the delay in Vega-C launches because of a launch failure. Since Vega-C however has fixed the nozzle issue that caused the failure and resumed launches, this argument is unconvincing. I suspect the real reason is that Arianespace has had problems getting customers for Ariane-6. Other than Amazon, which purchased 18 launches, European companies and nations have been generally reluctant to use Ariane-6 because it is too expensive (it is expendable).
This was only the fifth launch by Europe in 2025, so the leader board for the 2025 launch race remains unchanged:
143 SpaceX
67 China
13 Russia
13 Rocket Lab
SpaceX still leads the rest of the world in successful launches, 143 to 111.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon or from any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
The commercial arm of the European Space Agency, Arianespace, yesterday successfully launched Europe’s Sentinel-1D radar satellite, its Ariane-6 rocket lifting off from France’s French Guiana spaceport.
As noted here,
The 2,184-kilogram Sentinel-1D satellite is a twin of Sentinel-1C, which was launched aboard a Vega C rocket in December 2024. Given that the Ariane 62 can deliver more than 10 tonnes to low Earth orbit, launching the 2.3-tonne Sentinel-1D on a dedicated flight appears excessive, particularly as its twin was launched on a Vega C rocket.
Officials claimed the reason was a need to get the satellite in orbit because one in orbit had failed, and because of the delay in Vega-C launches because of a launch failure. Since Vega-C however has fixed the nozzle issue that caused the failure and resumed launches, this argument is unconvincing. I suspect the real reason is that Arianespace has had problems getting customers for Ariane-6. Other than Amazon, which purchased 18 launches, European companies and nations have been generally reluctant to use Ariane-6 because it is too expensive (it is expendable).
This was only the fifth launch by Europe in 2025, so the leader board for the 2025 launch race remains unchanged:
143 SpaceX
67 China
13 Russia
13 Rocket Lab
SpaceX still leads the rest of the world in successful launches, 143 to 111.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon or from any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News

