Results 101 to 110 of about 3,440 (204)
The Depth of the Heavens – Belief and Knowledge During 2500 Years
Open Astronomy, 2003 For Dante Alighieri (1265-1321) the spiritual cosmos contained the Heavens, Earth and Hell, and it was compatible with the physical cosmos known from Aristotle (384-322 B.C.).
Høg Erik
doaj +1 more source
The Apollo Group Asteroid 2008 OS9: Discovery, Orbit, Rotation and the Yarkovsky/YORP Effects
Open Astronomy, 2010 A project for astrometric and photometric observations of asteroids at the Baldone Observatory is described. One of the most important results of the project is the discovery of 2008 OS9, a 600 meter asteroid of the NEO Apollo group.
Černis K. +4 more
doaj +1 more source
Deep-space laser-ranging missions ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) and ASTROD I for astrodynamics and astrometry [PDF]
A Giant Step: from Milli- to Micro-Arcsecond Astrometry ed. W.
Jin. I. Platais. and M.A.C. Perryman (Cambridge University Press, 2008), pp.
379-382, 2007 Deep-space laser ranging will be ideal for testing relativistic gravity, and mapping the solar-system to an unprecedented accuracy. ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) and ASTROD I are such missions. ASTROD I is a mission with a single spacecraft; it is the first step of ASTROD with 3 spacecraft. In this talk, after a
arxiv
Symposium - International Astronomical Union, 1981 The 35-km interferometer at NRAO was used at 2.7 GHz during 1974–1979 to determine pulsar proper motions. Observations from each epoch were reduced to pseudo-position vector offsets which include both unknown, and constant, absolute position errors for the pulsars and their reference sources, as well as the time-varying proper motion of the pulsars ...
D. C. Backer, R. A. Sramek
openaire +2 more sources
A New Revision of the HDEC (Henry Draper Extension Charts) Catalog
Open Astronomy, 2016 A new version of the HDEC (Henry Draper Extension Charts) catalog is presented. The catalog includes 88,548 entries, more than 3500 of which (components of binary systems) were earlier corrupted by an algorithmic error (1579 multiple systems were ...
Ashimbaeva N., Sementsov V.
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Meteor trail drift research based on baseline observations
Solar-Terrestrial Physics, 2019 We analyze the results of a rare long-lived quasisymmetric ellipsoidal-annular meteor trail recorded on November 18, 2017 by two optical all-sky cameras, spaced at a distance of 150 km. The analysis is based on astrometric processing results with the use
Ivanov K.I. +4 more
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Ground-Based Astrometry 2010-2020 [PDF]
arXiv, 2009 We discuss the opportunities for astronomical discovery via ground-based astrometry carried out in the United States during the 2010-2020 decade. We describe imminent scientific breakthroughs that can be achieved at both classic astrometric scales -- narrow angle astrometry done by individual groups and large A*Omega astrometry carried out by consortia.
arxiv
Detecting and characterizing extrasolar planetary systems with astrometry: review from the Blue Dots astrometry working group [PDF]
arXiv, 2009 The astrometry technique is an important tool for detecting and characterizing exoplanets of different type. In this review, the different projects which are either operating, in construction or in discussion are presented and their performance discussed in the framework of the Blue Dots study.
arxiv
Observational Data and Orbits of the Asteroids Discovered at the Molėtai Observatory in 2005–2007
Open Astronomy, 2016 The paper presents statistics of the asteroids observed and discovered at the Molėtai Observatory, Lithuania, in 2005–2007 within the project for astrometric observations of the near-Earth objects (NEOs), the main belt asteroids and comets.
Černis K. +2 more
doaj +1 more source
The Baltic Meetings 1957 to 1967 [PDF]
arXiv, 2015 The Baltic meetings of astronomers from Northern Germany and Scandinavia began in 1957 and gathered up to 70 participants. Reports of the presentations are available from all meetings, providing an overview of the interests of astronomers in this part of the world 50 years ago.
arxiv