Voyager 1 - The Interstellar Conquest

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Voyager 1 - The Interstellar Conquest


Interstellar Mission

[Image: v1.jpg]

Mission Objective
The mission objective of the Voyager Interstellar Mission (VIM) is to extend the NASA exploration of the solar system beyond the neighborhood of the outer planets to the outer limits of the Sun's sphere of influence, and possibly beyond. This extended mission is continuing to characterize the outer solar system environment and search for the heliopause boundary, the outer limits of the Sun's magnetic field and outward flow of the solar wind. Penetration of the heliopause boundary between the solar wind and the interstellar medium will allow measurements to be made of the interstellar fields, particles and waves unaffected by the solar wind.

Mission Characteristic
The VIM is an extension of the Voyager primary mission that was completed in 1989 with the close flyby of Neptune by the Voyager 2 spacecraft. Neptune was the final outer planet visited by a Voyager spacecraft. Voyager 1 completed its planned close flybys of the Jupiter and Saturn planetary systems while Voyager 2, in addition to its own close flybys of Jupiter and Saturn, completed close flybys of the remaining two gas giants, Uranus and Neptune.
[Image: v2.gif]

At the start of the VIM, the two Voyager spacecraft had been in flight for over 12 years having been launched in August (Voyager 2) and September (Voyager 1), 1977. Voyager 1 was at a distance of approximately 40 AU (Astronomical Unit - mean distance of Earth from the Sun, 150 million kilometers) from the Sun, and Voyager 2 was at a distance of approximately 31 AU.
It is appropriate to consider the VIM as three distinct phases: the termination shock, heliosheath exploration, and interstellar exploration phases. The two Voyager spacecraft began the VIM operating, and are still operating, in an environment controlled by the Sun's magnetic field with the plasma particles being dominated by those contained in the expanding supersonic solar wind. This is the characteristic environment of the termination shock phase. At some distance from the Sun, the supersonic solar wind will be held back from further expansion by the interstellar wind. The first feature encountered by a spacecraft as a result of this interstellar wind/solar wind interaction was the termination shock where the solar wind slows from supersonic to subsonic speed and large changes in plasma flow direction and magnetic field orientation occur.
As of February 2017, Voyager 1 was at a distance of 20.6 Billion Kilometers (138 AU) from the sun and Voyager 2 at a distance of 17 Billion kilometers (114 AU).
Voyager 1 is escaping the solar system at a speed of about 3.6 AU per year, 35 degrees out of the ecliptic plane to the north, in the general direction of the Solar Apex (the direction of the Sun's motion relative to nearby stars). Voyager 2 is also escaping the solar system at a speed of about 3.3 AU per year, 48 degrees out of the ecliptic plane to the south.
Passage through the termination shock ended the termination shock phase and began the heliosheath exploration phase. Voyager 1 crossed the termination shock at 94 AU in December 2004 and Voyager 2 crossed at 84 AU in August 2007. Since passage through the termination shock, the spacecraft has been operating in the heliosheath environment which is still dominated by the Sun's magnetic field and particles contained in the solar wind. The heliosheath exploration phase ends with passage through the heliopause which is the outer extent of the Sun's magnetic field and solar wind. The thickness of the heliosheath is uncertain and could be tens of AU thick taking several years to traverse. Passage through the heliopause begins the interstellar exploration phase with the spacecraft operating in an interstellar wind dominated environment. This interstellar exploration is the ultimate goal of the Voyager Interstellar Mission.
Both Voyagers are headed towards the outer boundary of the solar system in search of the heliopause, the region where the Sun's influence wanes and the beginning of interstellar space can be sensed. The heliopause has never been reached by any spacecraft; the Voyagers may be the first to pass through this region, which is thought to exist somewhere from 8 to 14 billion miles from the Sun. This is where the million-mile-per-hour solar winds slows to about 250,000 miles per hour—the first indication that the wind is nearing the heliopause. The Voyagers should cross the heliopause 10 to 20 years after reaching the termination shock. The Voyagers have enough electrical power and thruster fuel to operate at least until 2020. By that time, Voyager 1 will be 13.8 billion miles (22.1 billion KM) from the Sun and Voyager 2 will be 11.4 billion miles (18.4 billion KM) away. Eventually, the Voyagers will pass other stars. In about 40,000 years, Voyager 1 will drift within 1.6 light-years (9.3 trillion miles) of AC+79 3888, a star in the constellation of Camelopardalis which is heading toward the constellation Ophiuchus.  In about 40,000 years, Voyager 2 will pass 1.7 light-years (9.7 trillion miles) from the star Ross 248 and in about 296,000 years, it will pass 4.3 light-years (25 trillion miles) from Sirius, the brightest star in the sky . The Voyagers are destined—perhaps eternally—to wander the Milky Way.

Voyager Time Line

Mariner Jupiter/Saturn 1977 is renamed Voyager

1977 Aug. 20
Voyager 2 launched from Kennedy Space Flight Center

1977 Sept. 5
Voyager 1 launched from Kennedy Space Flight Center

Voyager 1 returns first spacecraft photo of Earth and Moon

1979 Mar. 5
Voyager 1 makes its closest approach to Jupiter

1979 July 9
Voyager 2 makes its closest approach to Jupiter

1980 Nov. 12
Voyager 1 flies by Saturn

Voyager 1 begins its trip out of the Solar System

1981 Aug. 25
Voyager 2 flies by Saturn

Deep Space Network upgrades two 26-m antennas to 34-m

1986 Jan. 24
Voyager 2 has the first-ever encounter with Uranus

Deep Space Network begins expansion of 64-m antennas to 70-m

Voyager 2 "observes" Supernova 1987A

Voyager 2 returns first color images of Neptune

1989 Aug. 25
Voyager 2 is the first spacecraft to observe Neptune

Voyager 2 begins its trip out of the Solar System, below the ecliptic plane

1990 Jan. 1
Begins Voyager Interstellar Mission

1990 Feb. 14
Last Voyager Images - Portrait of the Solar System

1998 Feb. 17
Voyager 1 passes Pioneer 10 to become the most distant human-made object in space

2004 Dec. 15
Voyager 1 crosses Termination Shock

2007 Sep. 5
Voyager 2 crosses Termination Shock

2012 Aug. 25
Voyager 1 enters Interstellar Space

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(This post was last modified: 04-05-2017, 12:58 AM by Jared.)
04-05-2017, 12:49 AM
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RE: Voyager 1 - The Interstellar Conquest

Here's hoping something/someone finds it. How do we know they can decode the instructions? lol
04-07-2017, 08:19 PM
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