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数据结构和转换
astropy.constants
astropy.units
astropy.nddata
astropy.table
astropy.time
astropy.timeseries
astropy.coordinates
astropy.wcs
astropy.modeling
astropy.uncertainty
文件、I/O和通信
astropy.io.fits
astropy.io.ascii
astropy.io.votable
astropy.io.misc
astropy.io.typing
astropy.samp
计算和实用程序
astropy.cosmology
astropy.convolution
astropy.utils.iers
astropy.visualization
astropy.stats
螺母和螺栓
astropy.config
astropy.io.registry
astropy.utils
AB幅值：ABmag=-48.6对应于1 erg/s/cm2/Hz
