Читать книгу MNC - Василий Ласовский - Страница 4

Opened on January 23, 2023, at 9:24 pm:

Cassini's Grand Finale

https://www.youtube.com/watch?v=YSAwlkEt6wQ

Cassini-Huygens (spacecraft)

https://en.wikipedia.org/wiki/Cassini–Huygens

“Cassini orbiter is a space probe. It is named after the Italian-French astronomer Giovanni Cassini.

Launched aboard a Titan IVB/Centaur on October 15, 1997, Cassini was active in space for nearly 20 years, spending its final 13 years orbiting Saturn and studying the planet and its system after entering orbit on July 1, 2004

The voyage to Saturn included flybys of Venus (April 1998 and July 1999), Earth (August 1999), the asteroid 2685 Masursky, and Jupiter (December 2000). The mission ended on September 15, 2017 [at about 10:45 UTC], when Cassini's trajectory took it into Saturn's upper atmosphere and it burned up in order to prevent any risk of contaminating Saturn's moons, which might have offered habitable environments to stowaway terrestrial microbes on the spacecraft. <…>

On November 29, 2016, the spacecraft performed a Titan flyby that took it to the gateway of F-ring orbits: This was the start of the Grand Finale phase culminating in its impact with the planet. A final Titan flyby on April 22, 2017, changed the orbit again to fly through the gap between Saturn and its inner ring days later on April 26. Cassini passed about 3,100 km (1,900 mi) above Saturn's cloud layer and 320 km (200 mi) from the visible edge of the inner ring; it successfully took images of Saturn's atmosphere and began returning data the next day. After a further 22 orbits through the gap, the mission was ended with a dive into Saturn's atmosphere on September 15; signal was lost at 11:55:46 UTC on September 15, 2017, just 30 seconds later than predicted. It is estimated that the spacecraft burned up about 45 seconds after the last transmission.”

Why do I focus on this ‘sacrifice’ of a spacecraft in the atmosphere of Saturn? It's all about the date – this space probe flew for 20 years to its destination, and at the right time burned up in the atmosphere of the gas giant. This is similar to the meteorite from the previous chapter, which spent perhaps several million years in interstellar space in order to have time to ‘be near our star at a certain time’.

Let's also mention Juno:

Juno (spacecraft)

https://en.wikipedia.org/wiki/Juno_(spacecraft)

“Juno is a NASA space probe orbiting the planet Jupiter. Built by Lockheed Martin and operated by NASA's Jet Propulsion Laboratory, the spacecraft was launched from Cape Canaveral Air Force Station on August 5, 2011, as part of the New Frontiers program. Juno entered a polar orbit of Jupiter on July 5, 2016, to begin a scientific investigation of the planet. <…>

On August 27, 2016, at 13:44 GMT, the spacecraft passed over Jupiter at a speed of 208,000 kilometers per hour relative to the planet, and the minimum altitude was 4,200 kilometers from the upper edge of its atmosphere. The device at the same time took pictures of the North Pole area of the giant planet.”

Timeline of flights to Jupiter (links in Russian)

http://galspace.spb.ru/index45.html

http://galspace.spb.ru/index262.html

“On July 5, 2016, Juno will enter a capture orbit around Jupiter (431 m/s increment) with an initial orbital period of 78 days. The spacecraft will make 32 orbits around the planet, adjusting its orbit with maneuvers after each perijove, and, after completing the scientific program, will enter the atmosphere of Jupiter on October 16, 2017. [Since 2017, Juno's mission has been extended several times, up to 2025.]”

Saturn: Lord of the Rings (links in Russian)

http://galspace.spb.ru/index48.html

https://ru.wikipedia.org/wiki/Исследование_Сатурна

“The first Earth messenger to travel to Saturn was the American interplanetary station Pioneer-11, launched on April 6, 1973. COSPAR ID = 1973-019A.”

Opened on June 23, 2023 at 10:28 pm:

Starfall Draconids in 2017, October 8–10

https://vedmochka.net/астрология/календарь-звездопадов-2017.html

“This meteor shower begins in early October, peaking between the 8th and 10th. The maximum number of meteors per hour usually does not exceed 15.

The Draconids meteor shower is also called the Giacobinids, as it is associated with the comet 21P/Giacobini-Zinner.”