منابع مشابه
The Laser Rangefinder on the near Earth Asteroid Rendezvous Spacecraft
In 1999, the Near Earth Asteroid Rendezvous (NEAR) mission will place a spacecraft with five facility instruments, including the NEAR Laser Rangefinder (NLR), into a low-altitude (-50 km) orbit about the asteroid 433 Eros. The NLR is a high-fidelity altimeter capable of 3 1.5cm resolution and c2-m accuracy, and will be operate-d continuously while at Eros. The NLR design is quite robust and is ...
متن کاملOn The Optimal Spacecraft Fuel Consumption in Low Earth Orbit
The optimization problem for a 6DOF satellite equipped with constant specific impulse thrusters is addressed in terms of fuel consumption. The vehicle is assumed to move in Low Earth Orbit: the Keplerian motion around the Earth is perturbed both by the molecular air impingement (aerodynamic drag) and by the gravitational field disturbance known as J2 effect. Further results are achieved by simp...
متن کاملNEOKepler: Discovering Near-Earth Objects Using the Kepler Spacecraft
The Kepler Mission has been an irrefutable success. In the last 4.5 years, it has monitored 150 confirmed exoplanets in over 75 stellar systems and detected an additional ∼3,300 planet candidates. Using these data, we have learned the size distribution of planets in our galaxy, the likelihood that a star hosts an Earth-sized planet, and the percentage of stars that contain multiplanet systems. ...
متن کاملLive E! Project: Sensing the Earth
The Live E! project is an open research consortium among industry and academia to explore the platform to share the digital information related with the earth and our living environment. We have getting a lot of low cost sensor nodes with Internet connectivity. The deployment of broadband and ubiquitous networks will enable autonomous and global digital information sharing over the globe. In th...
متن کاملAnomalous orbital-energy changes observed during spacecraft flybys of earth.
We report and characterize anomalous orbital-energy changes observed during six Earth flybys by the Galileo, NEAR, Cassini, Rosetta, and MESSENGER spacecraft. These anomalous energy changes are consistent with an empirical prediction formula which is proportional to the total orbital energy per unit mass and which involves the incoming and outgoing geocentric latitudes of the asymptotic spacecr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: TRENDS IN THE SCIENCES
سال: 2003
ISSN: 1884-7080,1342-3363
DOI: 10.5363/tits.8.12_30