| 词条 | Znamya (satellite) |
| 释义 |
The Znamya project was a series of orbital mirror experiments in the 1990s that intended to beam solar power to Earth by reflecting sunlight. It consisted of two experiments – the Znamya 2 experiment, and the failed Znamya 2.5 – and the proposed Znamya 3. The project was abandoned by the Russian Federal Space Agency after the failed deployment of the Znamya 2.5. Znamya 2The Znamya 2 was a 20-metre wide space solar mirror. Znamya-2 was launched aboard Progress M-15 from Baikonur on 27 October 1992. After visiting the EO-12 crew aboard the Mir space station the Progress T-15 then undocked and deployed the reflector from the end of the Russian Progress spacecraft on 4 February 1993, next to the Russian Mir space station. The mirror deployed successfully, and, when illuminated, produced a 5 km wide bright spot, which traversed Europe from southern France to western Russia at a speed of 8 km/s.[1] The bright spot had a luminosity equivalent to approximately that of a full moon.[2] Although clouds covered much of Europe that morning, a few ground observers reported seeing a flash of light as the beam swept by.[3] The mirror was de-orbited after several hours and burned up in atmospheric reentry over Canada.[4][5] The Znamya mirror had originally been designed as a prototype of a solar sail propulsion system,[3] but was repurposed as a space mirror for illumination when interest in solar sails flagged. Znamya 2.5The Znamya 2.5 was a successor to the Znamya 2, which was deployed on 5 February 1999. It had a diameter of 25 m, and was expected to produce a bright spot 7 km in diameter, with luminosity between five and ten full moons. However, soon after deployment, the mirror caught on an antenna on the Progress, and ripped. After several vain attempts by Russian mission control to free the mirror from the antenna, the Znamya 2.5 was de-orbited, and burned up upon reentry.[6][2][7] Znamya 3The Znamya 3 was intended to be a scaled-up version of the previous two Znamyas, with a diameter of 60–70 metres. It was never built, as the project was abandoned after the failure of the Znamya 2.5.[1] References1. ^1 [https://web.archive.org/web/20060808175720/http://www.space-frontier.org/Events/Znamya/ Znamya Space Mirror], space-frontier.org, 5 February 1999 (archived) 2. ^1 [https://triz-journal.com/space-mirror/ Space Mirror], The Triz Journal, 15 June 2002 3. ^1 Tim Folger, "New moon – Russian satellite acts as a mirror to light remote areas", Discover, Jan, 1994 (web version, (accessed 29 August 2008)). 4. ^{{cite web | last =McDowell | first =Jonathan | title =Jonathan's Space Report – No 143 – Mir | work =Jonathan's Space Report | publisher =Jonathan McDowell | date =10 February 1993 | url =http://www.planet4589.org/space/jsr/back/news.143 | accessdate =25 February 2007}} 5. ^{{cite web | last =Wade | first =Mark | title =Mir EO-12 | work =Encyclopedia Astronautica | publisher =Mark Wade | date =pub date unknown | url =http://www.astronautix.com/flights/mireo12.htm | accessdate =25 February 2007}} 6. ^Znamya - what went wrong?, BBC News 5 February 1999 7. ^{{cite web|last=Wade |first=Mark |title=Mir News 453: Znamya 2.5 |work=Encyclopedia Astronautica |publisher=Mark Wade |date=pub date unknown |url=http://www.astronautix.com/details/mir50838.htm |accessdate=25 February 2007 |deadurl=yes |archiveurl=https://web.archive.org/web/20060603102632/http://www.astronautix.com/details/mir50838.htm |archivedate=3 June 2006 }} External links
2 : Russian inventions|Satellites of Russia |
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