منابع مشابه
The mass of dwarf planet Eris.
The discovery of dwarf planet Eris was followed shortly by the discovery of its satellite, Dysnomia, but the satellite orbit, and thus the system mass, was not known. New observations with the Keck Observatory and the Hubble Space Telescopes show that Dysnomia has a circular orbit with a radius of 37,350 +/- 140 (1-sigma) kilometers and a 15.774 +/- 0.002 day orbital period around Eris. These o...
متن کاملIrradiation Products on Dwarf Planet Makemake
The dark, reddish tinged surfaces of icy bodies in the outer solar system are usually attributed to the long term irradiation of simple hydrocarbons leading to the breaking of C–H bonds, loss of hydrogen, and the production of long carbon chains. While the simple hydrocarbon methane is stable and detected on the most massive bodies in the Kuiper Belt, evidence of active irradiation chemistry is...
متن کاملThe Aptly Named Phoenix Dwarf Galaxy
The Local Group galaxy Phoenix has the properties of a dwarf spheroidal galaxy, but an adjacent HI cloud has been recently found to be at the same radial velocity as the stars. The proximity suggests that this cloud is associated with the most recent (≤ 100 Myr) star formation in Phoenix. We have obtained relatively high sensitivity and high resolution HI imaging with the VLA with the goal of d...
متن کاملAstronomy and Astrophysics the Closest Extrasolar Planet a Giant Planet around the M4 Dwarf Gl 876
Precise radial velocity observations of the nearby M4 dwarf Gl 876 with the Observatoire de Haute Provence 1.93 m telescope and the new 1.20 m swiss telescope at la Silla indicate the presence of a jovian mass companion to this star. The orbital fit to the data gives a period of 60.8 days, a velocity amplitude of 246m.s −1 and an eccentricity of 0.34. Assuming that Gl 876 has a mass of 0.3 M ⊙ ...
متن کاملThe closest extrasolar planet A giant planet around the M 4 dwarf Gl 876 ? , ? ?
Precise radial velocity observations of the nearby M4 dwarf Gl 876 with the Observatoire de Haute Provence 1.93 m telescope and the new 1.20 m swiss telescope at la Silla indicate the presence of a jovian mass companion to this star. The orbital fit to the data gives a period of 60.8 days, a velocity amplitude of 246m.s−1 and an eccentricity of 0.34. Assuming that Gl 876 has a mass of 0.3 M , t...
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ژورنال
عنوان ژورنال: Eos, Transactions American Geophysical Union
سال: 2006
ISSN: 0096-3941
DOI: 10.1029/2006eo390010