منابع مشابه
The Strange Case of 133p/elst-pizarro: a Comet among the Asteroids
We present a new investigation of the comet-asteroid transition object 133P/(7968) Elst-Pizarro. We find mean optical colors (B V = 0.69 0.02, V R = 0.42 0.03, R I = 0.27 0.03) and a phase-darkening coefficient ( = 0.044 0.007 mag deg 1) that are comparable both to other comet nuclei and to C-type asteroids. As in 1996, when this object’s comet-like activity was first noted, data from 2002 show...
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Besides new observations, mining old photographic plates and CCD image archives represents an opportunity to recover and secure newly discovered asteroids, also to improve the orbits of Near Earth Asteroids (NEAs), Potentially Hazardous Asteroids (PHAs) and Virtual Impactors (VIs). These are the main research aims of the EURONEAR network. As stated by the IAU, the vast collection of image archi...
متن کاملMineralogy of Asteroids
The past decade has seen a significant expansion both in the interpretive methodologies used to extract mineralogical information from asteroid spectra and other remote-sensing data and in the number of asteroids for which mineralogical characterizations exist. Robust mineralogical characterizations now exist for more than 40 asteroids, an order a magnitude increase since Asteroids II was publi...
متن کاملEvolution of Comets Into Asteroids
In the past decade, new observations and new research tools have afforded us a better understanding of the interrelationships between comets and asteroids. The extensive automated surveys for near-Earth objects (NEOs) have serendipitously discovered many objects in comet-like orbits. Dynamical simulation codes have improved to the point where we can simulate the detailed orbital behavior of lar...
متن کاملVisible-Wavelength Spectroscopy of Asteroids
Since first becoming available for astronomical research in the early 1980s, charge-coupleddevice (CCD) spectrographs have had a profound impact on our ability to measure the spectralreflectance properties of asteroids. High signal-to-noise, low-resolution spectra, covering the visible-wavelength region from 0.4 to 1.0 μm, are now routinely obtained for asteroids much fainter than were measured...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1912
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.19121910704