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Kepler delivers 120 Mbps uplink to Arctic via satellite broadband | FierceWireless
The demonstration marks the first time ever that the central Arctic has been successfully connected through a high-bandwidth satellite network.
Kepler  LEO  constellation  satellite  broadband  space  nanosatellite 
november 2019 by stevesong
GitHub - keplergl/kepler.gl: Kepler.gl is a powerful open source geospatial analysis tool for large-scale data sets.
Kepler.gl is a data-agnostic, high-performance web-based application for visual exploration of large-scale geolocation data sets. Built on top of Mapbox GL and deck.gl, kepler.gl can render millions of points representing thousands of trips and perform spatial aggregations on the fly.

Kepler.gl is also a React component that uses Redux to manage its state and data flow. It can be embedded into other React-Redux applications and is highly customizable.
software  opensoure  javascript  webgl  kepler 
october 2019 by gkamp
The Kepler Space Telescope is dead - The Verge
케플러 우주 망원경이 공식적으로 은퇴했다.
케플러 우주 망원경은 우리 태양계 밖의 행성을 찾기 위한 목적으로 2009년 발사되었다.
이 망원경의 관측 방법이 좀 독특한데, 항성을 계속해서 보고 있다가 그 위로 행성이 지나가면(일식), 감소한 밝기나 시간에 따라서 지나간 행성의 정보를 관측하는 방식이다.


원래 6년간 운영할 계획으로 발사하였지만 9년이나 근무하였다.
은퇴 원인은 연료 부족.

2013년에 치명적인 기계 결함이 발생하여 더이상 사용하지 못할 것으로 예상하였다.
측정을 위해서는 망원경이 고정된 위치에서 안정적으로 피사체를 바라보고 있어야 하는데, 이러한 기능을 하는 고정 휠 3개 중 한개가 고장나 버린 것.
https://www.nasa.gov/feature/ames/nasas-k2-mission-the-kepler-space-telescopes-second-chance-to-shine

하지만 NASA의 엔지니어들은 정말 천재적인 방법으로 이 문제를 해결했는데...
태양에서 나오는 태양광 입자의 압력으로 고장났던 3번째 고정휠 역할을 하게 만드는 것.
각도를 잘 맞추면 마치 손가락 위에 연필이 중심을 잡고 있듯이(이게 나사 공식 묘사다.) 망원경이 고정될 것이라는 이야기.

이렇게 고정 휠 하나가 고장난 상태에서 태양광 압력으로 운영되는 시기를 K2 미션이라고 한다.
kepler  nasa  space  telescope  verge 
november 2018 by yun
Twitter
. You helped prove that we are not so special after all, and that rocky [exo]planets are super common across…
Kepler  from twitter_favs
october 2018 by agussoler
The ROI Challenge of IoT Smallsats - NSR, Oct 2018
"In the recently released M2M and IoT via Satellite, 9th Edition report, NSR projected over 3.7 million smallsat IoT in-service units by 2027; this will generate approx. $133 million in retail revenues during the same year, but it only represents an overall share of only 5% of total satellite M2M/IoT revenues. ARPUs will be low on smallsat IoT networks"

"To turn a profit on these small satellite constellations purely from IoT, millions of IoT devices will be required. On each constellation. With only several million connected devices to come online on smallsats over the coming decade, competition will be extremely fierce between the 15+ constellations for this purpose, with most either merging or never actually launching."

"Further, satellite renewals must be considered, as the average life span for these satellites is up to 3 years. Any launch failure would significantly impact latency and IoT performance. Nonetheless, NSR expects a few smallsat IoT constellations to reach positive ROIs within the next 10 years, assuming additional financing is available to maintain positive cash flow over the first few years of launch."

"Low data rates (a few bytes) per packet transferred are fine for now; however, this fails to consider the growth of data requirements coming from big data analysis. This results in additional levels of data that will be transmitted, despite more analysis being done at the ‘edge’ and not transmitted via satellite. This is where ‘bigsat’ constellations such as Iridium NEXT and Globalstar’s second generation network come into play."

Bottom line: "the ROI on comparatively low-cost CAPEX of smallsats is depressed by even lower ARPUs and end-user demand."
NSR  market-research  business  satellite  smallsats  IoT  M2M  investing  Kepler  Iridium  Globalstar 
october 2018 by pierredv

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