SpaceX Perkenalkan Kapsul Antariksa Baru Pengganti Soyuz TMA

SpaceX Perkenalkan Kapsul Antariksa Baru Pengganti Soyuz TMA

Elon Musk berfoto bersama dengan kapsul Dragon V2. Image credit: SpaceX

Baru-baru ini perusahaan antariksa swasta terkenal asal Amerika, SpaceX, memperkenalkan kapsul antariksa baru yang akan digunakan untuk membawa astronot ke Stasiun Luar Angkasa Internasional (ISS). Kapsul yang diberinama Dragon V2 itu akan menggantikan fungsi dari pesawat ulang alik (Space Shuttle) yang sudah dipensiunkan NASA pada 2011 lalu. Kapsul Dragon V2 ini sekaligus akan menggantikan peran dari kapsul Soyuz yang selama 3 tahun ini digunakan oleh astronot untuk terbang ke ISS, dimana biaya penerbangan (pergi-pulang) untuk satu orang astronot sekira 70 juta dollar.

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Pelan Tapi Pasti Bulan Pergi Meninggalkan Bumi

Pelan Tapi Pasti Bulan Pergi Meninggalkan Bumi

Bulan. Image credit: wikiversity

Bumi dan Bulan bisa dibilang sebagai sahabat yang tumbuh, berkembang dan menjalani hidup bersama-sama untuk mengelilingi Matahari dan galaksi. Berdasarkan penelitian, Bulan lahir sebagai akibat dari tabrakan antara Bumi muda dengan obyek seukuran planet Mars yang disebut Theia sekira 4,5 miliar tahun yang lalu. Kemudian, kedua obyek baik Bumi dan Bulan bersama-sama menjalani hidup berdua.

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Parameters - Longitude Of The Periapsis

Longitude of the periapsis

This article may be confusing or unclear to readers. Please help us clarify the article; suggestions may be found on the talk page. (July 2009)

In celestial mechanics, the longitude of the periapsis (symbolized ϖ) of an orbiting body is the longitude (measured from the point of the vernal equinox) at which the periapsis (closest approach to the central body) would occur if the body's inclination were zero. For motion of a planet around the Sun, this position could be called longitude of perihelion. The longitude of periapsis is a compound angle, with part of it being measured in the plane of reference and the rest being measured in the plane of the orbit. Likewise, any angle derived from the longitude of periapsis (e.g. mean longitude and true longitude) will also be compound.
Sometimes, the term longitude of periapsis is used to refer to ω, the angle between the ascending node and the periapsis. That usage of the term is especially common in discussions of binary stars and exoplanets.^[1] However, the angle ω is less ambiguously known as the argument of periapsis.

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Parameters - Argument Of Periapsis

Argument of periapsis

The argument of periapsis (also called argument of perifocus or argument of pericenter), symbolized as ω, is one of the orbital elements of an orbiting body. Specifically, ω is the angle between the orbit's periapsis (the point of closest approach to the central point) and the orbit's ascending node (the point where the body crosses the plane of reference from South to North). The angle is measured in the orbital plane and in the direction of motion. For specific types of orbits, words such as "perihelion" (for Sun-centered orbits), "perigee" (for Earth-centered orbits), "periastron" (for orbits around stars) and so on may replace the word "periapsis". See apsis for more information.

This section may be confusing or unclear to readers. (January 2012)

An argument of periapsis of 0° means that the orbiting body will be at its closest approach to the central body at the same moment that it crosses the plane of reference from South to North. An argument of periapsis of 90° means that the orbiting body will reach periapsis at its northmost distance from the plane of reference.
Adding the argument of periapsis to the longitude of the ascending node gives the longitude of the periapsis. However, especially in discussions of binary stars and exoplanets, the terms "longitude of periapsis" or "longitude of periastron" are often used synonymously with "argument of periapsis".

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Parameters - Longitude Of The Asending Node

Longitude of the ascending node

This article may be confusing or unclear to readers. Please help us clarify the article; suggestions may be found on the talk page. (July 2009)

The longitude of the ascending node.

The longitude of the ascending node (☊ or Ω) is one of the orbital elements used to specify the orbit of an object in space. It is the angle from a reference direction, called the origin of longitude, to the direction of the ascending node, measured in a reference plane.^[1] Commonly used reference planes and origins of longitude include:

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