NGC 5866星系群位於M101星系群(這個集團包含風車星系和它的伴星系)與M51星系群(這個集團包含車輪星系、向日葵星系和其他幾個星系)的西北方[5]。這三個星系群的距離(對集團中的星系進行獨立的測量)是相似的,建議M51星系群、M101星系群、和NGC 5866星系群確實都是更大星系團鬆散和延伸結構的一部份[5]但是,多數認定星系群的方法(包括前述所參考和援引的資料)都認為這三個星系群是完全分開的集團。
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^ 3.03.1R. B. Tully. Nearby Galaxies Catalog. Cambridge: Cambridge University Press. 1988. ISBN 0-521-35299-1.
^ 4.04.14.24.34.4NASA/IPAC Extragalactic Database. Results for various galaxies. [2006-10-17]. (原始内容于2011-05-14).
^ 5.05.1L. Ferrarese, H. C. Ford, J. Huchra, R. C. Kennicutt Jr., J. R. Mould, S. Sakai, W. L. Freedman, P. B. Stetson, B. F. Madore, B. K. Gibson, J. A. Graham, S. M. Hughes, G. D. Illingworth, D. D. Kelson, L. Macri, K. Sebo, N. A. Silbermann. A Database of Cepheid Distance Moduli and Tip of the Red Giant Branch, Globular Cluster Luminosity Function, Planetary Nebula Luminosity Function, and Surface Brightness Fluctuation Data Useful for Distance Determinations. Astrophysical Journal Supplement. 2000, 128: 431–459 [2009-04-06]. doi:10.1086/313391. (原始内容于2007-10-15).