SIMBAD references

1993yCat.3135....0C - CDS/ADC Collection of Electronic Catalogues, 3135, 0 (1993)

VizieR Online Data Catalog: Henry Draper Catalogue and Extension, published in Ann. Harvard Obs. 91-100 (1918-1925)

CANNON A.J. and PICKERING E.C.

Journal keyword(s):

VizieR on-line data: <CDS Catalogue: III/135>

Simbad objects: 252973

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