J-型小行星是光谱与古铜无球陨石相似的小行星,大概是来自灶神星地壳深处。

它们的光谱与V-型小行星相似,但是在1 μm有特别强的吸收带。

此型的例子有2442 Corbett、, 3869 Norton4005 1979 TC2、和4215 1987 VE1[1]

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