Comet Yanaka (1988r): A New Class of Carbon-Poor Comet
Comet Yanaka (1988r): A New Class of Carbon-Poor Comet
复制标题
谷中彗星 (1988r)：一类新型贫碳彗星
作者：
U. Fink
作为确定彗星样本群化学成分计划的一部分，1989年1月观测到一颗非常不寻常的彗星Yanaka（1988r）。虽然彗星显示出通常的Ol和NH2排放，但它没有显示出任何C2或CN排放的迹象。相对于典型彗星，该彗星的C2至少减少了100倍，CN减少了25倍。如果彗星起源于星际云，Yanaka（1988 r）可能是来自不同成分的云的闯入者。如果Yanaka（1988 r）是在我们的太阳系内形成的，那么太阳星云的均匀性就比大多数现有的形成模型所假设的要小。
As part of a program to determine the chemical composition of a sample population of comets, a very unusual comet, Yanaka (1988r), was observed in January 1989. Although the comet showed the usual emissions of Ol and NH2, it did not display any hint of C2 or CN emission. The comet is depleted in C2 by at least a factor of 100 and in CN by a factor of 25 relative to typical comets. If comets originate from interstellar clouds, Yanaka (1988r) could be an interloper from a cloud of different composition. If Yanaka (1988r) was formed within our solar system, the solar nebula was less uniform than assumed by most present models of formation.