NASAとSpaceXがStarlink衝突予防のため高度な情報共有契約を締結
今回は「NASAとSpaceXがStarlink衝突予防のため高度な情報共有契約を締結」についてご紹介します。
関連ワード （NASA、SpaceX、Starlink等） についても参考にしながら、ぜひ本記事について議論していってくださいね。
本記事は、TechCrunch様で掲載されている内容を参考にしておりますので、より詳しく内容を知りたい方は、ページ下の元記事リンクより参照ください。
NASAは、誰でも自由に、何でもかんでも宇宙に打ち上げて良いとは認めていない。国際宇宙ステーション（ISS）を含む地球軌道上の同局のアセットへの影響を確認する必要があるからだ。NASAには、いわゆるConjunction Assessment（接近評価）を中心とした一連の標準規則がある。これは基本的に、宇宙に存在する物同士が接近し、衝突の危険性が生じるか否かを判断するためのものだ。ご推察のとおり、何がいつどこを飛ぶかを審査する。
米国時間3月19日、NASAは、SpaceX（スペースエックス）との間で、通常の接近評価の内容を超える新たな契約を発表した。NASAがその使命を果たすために、どのような企業とも協働できることを認めるSpace Act Agrement（航空宇宙契約）の委託下に位置するこの高度な合意は「非弁済」とされている。つまり、契約者双方が利益を得られるため、金銭的取引は生じない。
SpaceXは、Starlink（スターリンク）という現在、最も大量の人工衛星によるコンステレーションを運用しており、その数は急速に増え続けている。またStarlinkの各衛星にはミッションの内容に応じて自律的に移動できる能力がある。そのためNASAとSpaceXは、接近を避けるために緊密な協力関係を継続する必要がある。この契約は、事実上そう物語っている。
したがって、NASAとSpaceXとの間で交わされるコミュニケーションと情報共有の方法を規定したこの合意は、これまで通常考えられていたものよりも踏み込んだ内容になっている。NASAは、計画中のミッションに関する詳細情報を事前にSpaceXに伝えなければならない。NASAのアセットがSpaceXのコンステレーションの近くを通過する可能性のある場合、SpaceXはその情報を元にStarlink衛星の自動衝突防止機能を適切にプログラムする。またNASAは、その評価能力や事故防止対策の改善でSpaceXと直接協力し合うことができる。さらに「放射輝度」、つまりStarlink衛星の反射光をより効率的に抑えるための技術的支援をNASAが提供することもできる。
一方SpaceXは、Starlink衛星が「回避行動」を取り「NASAのあらゆるアセットとの距離を保ち衝突を防止する」ように責任を持つ。SpaceXはまた、Starlink衛星が衝突防止行動を取れない間の「準備期間」の予定を提出する必要がある。これはおもに打ち上げ直後から、目標軌道に到達して稼働を開始するまでの間に多く発生する時間帯だ。
もう1つ、この合意で重要な点は、SpaceXがStarlinkを打ち上げるときは、ISSの軌道の最低高度と最高高度からそれぞれ少なくとも5kmの高度の差をつけて地球を周回するよう計画しなければならないというものがある。さらにSpaceXは、衛星の反射光を減衰させる技術の効果に関する評価結果を共有することが求められる。この問題に関するガイドラインを、NASAが調整できるようにするためだ。
合意の全内容は下記の通りだが、最も注目すべきは、SpaceXのコンステレーション衛星の数が1200基を超え、2021年中に1500基以上にまで増えることを受けて、NASAは同社を地球低軌道の良きパートナーであり住民になって欲しいという望みが明らかに見て取れる点だ。またNASAは、SpaceXに多大な信頼を寄せると同時に、その手に大きな責任を持たせたいとも考えている。そもそもNASAは、Starlinkに搭載された自律的能力が、実際に起こり得るどのような危険も回避できると述べている。NASAはこの文書を、他のコンステレーション運営企業にも転用できるように構成している。
NASA-SpaceX Starlink Agreem… by TechCrunch
関連記事：スペースXが記録となる9回目のFalcon 9打ち上げに成功、2週間で3回Starlink衛星を投入
画像クレジット：SpaceX
【原文】
NASA doesn’t just let anyone launch whatever they want to space without checking in with the agency about potential impacts to its own assets on orbit, including the International Space Station (ISS). The agency has a standard set of guidelines around so-called “Conjunction Assessment,” which is basically to determine the risk that a close approach between in-space objects might occur, which in turn could potentially result in a collision. This assessment determines when and where something flies, as you might expect.
Today, NASA published a new agreement between itself and SpaceX that goes above and beyond its standard Conjunction Assessment practices. The special agreement, which exists under the mandate of the Space Act that allows NASA to work with any company in order to fulfill its mandate, is defined as a “nonreimbursable” one, or just one in which no money changes hands, which is designed to benefit both parties involved.
It effectively lays out that because SpaceX operates Starlink, which is the largest existing on-orbit constellation of spacecraft, and which is growing at a rapid pace, and because each of these is equipped with the ability to maneuver itself autonomously in response to mission parameters, there needs to exist a deeper ongoing partnership between NASA and SpaceX for conjunction avoidance.
Accordingly, the agreement outlines the ways in which communication and information sharing between NASA and SpaceX will exceed what has been typically been expected. For NASA’s part, it’ll be providing detailed and accurate info about its planned missions in advance to SpaceX so that they can use that to properly program Starlink’s automated avoidance measures whenever a mission is happening where NASA assets might cross paths with the constellation. It’ll also be working directly with SpaceX on improving its ability to assess and avoid any incidents, and will be providing technical support on how SpaceX might better mitigate “photometric brightness,” or the reflectivity of its Starlink spacecraft.
Meanwhile, SpaceX will be responsible for ensuring its Starlink satellites take “evasive action” to “mitigate close approaches and avoid collisions with all NASA assets.” It’ll also be required to provide time frame “cut-outs” for periods when Starlink satellites aren’t able to employ their collision avoidance, which mostly occurs during the phase right after they’re launched when they’re still being activated and put into their target orbits.
Another key point in the agreement is that SpaceX plan Starlink launches so they’re at minimum either 5 km above or below the highest and lowest points of the International Space Station’s orbit as it makes its way around the Earth. Finally, SpaceX is also expected to share its own analysis of the effectiveness of its satellite dimming techniques, so the agency can adjust its own guidance on the subject accordingly.
The full agreement is embedded below, but the main takeaway is that NASA clearly wants SpaceX to be a better low-Earth partner and citizen as the size of its constellation pushes past the 1,200 mark, on track to grow to around 1,500 or more by year’s end. Also, NASA’s putting a lot of trust and responsibility in SpaceX’s hands — basically it’s laying out that Starlink’s built-in autonomous capabilities can avoid any really danger that might arise. The way NASA has structured this document also leaves open the possibility that it could repurpose it for other constellation operators — a growing need, given the number of companies working on networks of low-Earth orbit spacecraft.
View this document on Scribd
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（文：Darrell Etherington、翻訳：金井哲夫）
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