[florin1982]

http://www.defense.gov/news/newsarticle.aspx?id=49024


Navy Missile Hits Decaying Satellite Over Pacific Ocean
American Forces Press Service


WASHINGTON, Feb. 20, 2008 – A network of land-, air-, sea- and spaced-based sensors confirms that the U.S. military intercepted a non-functioning National Reconnaissance Office satellite which was in its final orbits before entering the earth's atmosphere, defense officials announced in a press release.
At approximately 10:26 p.m. EST today, a U.S. Navy AEGIS warship, the USS Lake Erie (CG-70), fired a single modified tactical Standard Missile-3 (SM-3) hitting the satellite approximately 247 kilometers (133 nautical miles) over the Pacific Ocean as it traveled in space at more than 17,000 mph. USS Decatur (DDG-73) and USS Russell (DDG-59) were also part of the task force.

The objective was to rupture the fuel tank to dissipate the approximately 1,000 pounds (453 kg) of hydrazine, a hazardous fuel which could pose a danger to people on earth, before it entered into earth's atmosphere. Confirmation that the fuel tank has been fragmented should be available within 24 hours.

Due to the relatively low altitude of the satellite at the time of the engagement, debris will begin to re-enter the earth’s atmosphere immediately. Nearly all of the debris will burn up on reentry within 24-48 hours and the remaining debris should re-enter within 40 days.

DoD will conduct a press briefing at 7 a.m. EST to provide further information related to the operation. The briefing can be viewed live on www.Defenselink.com through the Pentagon Channel.

[zoth]

..

[florin1982]

Este interesant de aflat daca traiectoria rachetei a fost la intalnire (asa cum este reprezentata in a doua poza) sau in urmarire. Sansele pentru a nimeri satelitul sunt mai mari in cazul unei trageri la urmarire insa viteza relativa de impact este mai mare la intalnire... posibil sa fi venit din spate si sub un anumit unghi.

La intalnire, corectiile necesare sunt mult mai violente datorita vitezei relative foarte mare. Astfel sansele pentru a nimeri o tinta descresc mai ales daca tinta este manevrabila.

Totusi satelitul nu este manevrabil si traiectoria este bine determinata; deci tragerea la inalnire nu poate fi eliminata dar chiar si asa nu ar fi preferata.

Florin

[Mitu Catalin]

Am un sentiment foarte puternic ca a fost la intalnire.Armamentul asta este construit sa intercepteze rachete. Pentru o traiectorie la "urmarire" ar fi fost necesara o racheta mai mare (capabila practic sa satelizeze impactorul- iar o comparatie a dimensiunilor intre Shavit si SM3 ma face sa ma indoiesc de asta ) .
Oricum sunt de-a dreptul uimit ca un SM2 modificat cu un booster si soft poate face asa ceva - la urma urmei SM2 -ul este prezent pe destul de multe nave din diverse tari (vestice+japonia).