【摘要】 利用国家天文台兴隆观测基地的2.16 m光学望远镜,对6颗彗星78P、C/2009P1、49P、C/2010 G2、C/2010 S1、C/2011 F1进行了10次光谱观测,同时拍摄了类太阳恒星光谱.用IRAF(Image Reduction and Analysis Facility)软件对得到的谱线进行了处理,得到了这6颗彗星的相对反射谱.将相对反射谱数据与Bus-DeMeo小行星光谱分类法中的24个类型进行比较,计算了其光谱距离.根据光谱距离排序和彗星相对反射谱的细节以及K-S检验,最终确定了与该彗星光谱接近的小行星光谱类型.更多还原

【Abstract】 In order to explore the relationship between comets and asteroids,some comets’ spectra have been observed,and compared with the spectral types of the asteroids. The 2.16 m telescope in Xinglong observing station of National Astronomical Observatories is used to observe the spectra of six comets:78P,C/2009 P1,49P,C/2010 G2,C/2010 S1, and C/2011 F1.At the same time,the spectra of some sun-like stars are also observed.Then the IRAF(Image Reduction and Analysis Facility) software is used for data process.The bias,the flat,and the cosmic ray are removed from the images.And the comets’ spectra are divided by the sun-like stars’ spectra to derive the relative reflectance.Then the images of the relative reflectance spectra of the six comets are drawn.In addition,the spectra of the comets are compared to the 24 types in the Bus-DeMeo asteroid spectral taxonomy.The spectral distance is calculated as well.According to the order of the spectral distance,the details of the relative reflectance spectra,and the results of the K-S test,the types of the asteroids which may be close to those of comets have been finally determined.Here is the conclusion:the spectral type of comet 78P is close to Sv-type;the spectral type of comet C/2009 P1 is close to Sa-type or Sr-type of S-complex;the spectral type of comet C/2010 G2 is close to T-type;the spectral type of comet C/ 2010 SI is close to Sv-type;the spectral type of comet C/2011 Fl is close to T-type.Because the comet 49P’s data has a very poor SNR(Signal/Noise Ratio),the spectral type of comet 49P can’t be determined clearly.更多还原