منابع مشابه
Search for Activity in 3200 Phaethon
We present deep optical imaging of Geminid meteor stream parent 3200 Phaethon taken in search of low-level cometary activity (i.e., coma or dust trail). Although no unambiguous cometary behavior was observed, we find an upper limit on the object’s cometary mass-loss rate of Ṁlim 0:01 kg s . The corresponding active fraction (the fraction of the surface area that could consist of freely sublimat...
متن کاملRecurrent Perihelion Activity in (3200) Phaethon
We present a study of planet-crossing asteroid (3200) Phaethon at three successive perihelia in 2009, 2010, and 2012, using the NASA STEREO spacecraft. Phaethon is clearly detected in 2009 and 2012, but not in 2010. In both former years, Phaethon brightened unexpectedly by ∼1 mag at large phase angles, inconsistent with the ∼1 mag of steady fading expected from a discrete, macroscopic body over...
متن کاملAn upper limit on gas production from 3200 Phaethon
Asteroid 3200 Phaethon resembles a comet in some ways, including a highly-eccentric orbit (e∼ 0.89) and a strong associated meteor shower (the Geminids). Yet this object has never been observed to exhibit any cometary activity, i.e., gas production. We observed 3200 Phaethon with the Caltech Submillimeter Observatory on two occasions, once while it was near its closest approach to Earth as it n...
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The golden era of molecular biology has paved the way for us now to tweak, fix, engineer, or even entirely synthesize genomes at levels and scales never seen before. Sequencing technologies continue to improve at exponential rates and have yielded powerful new insights into organisms of the distant past, as well as those that co-inhabit the planet with us. The era of genomics has ushered in the...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2016
ISSN: 1538-3881
DOI: 10.3847/1538-3881/153/1/23