Col Reference--- ---------
R1 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17,347 (pe)
R2 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17,347 (pg)
R3 Clasen M.-C. 1937, Astr. Nach. 264, 33
R4 Maciejewski G. & Niedzielski A. 2007, Astron. Astrophys. 467, 1065
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