Literature sources:


A5: V.P.Goranskij with the 0.5 m meniscus Maksutov telescope of the SAI Crimean Station and Apogee Alta U8300 CCD. V = V(A5) + 0.08; Rc = Rc(A5) - 0.05; Ic = Ic(A5) - 0.17.
JM: R.Jurdana-Sepic, U.Munari, ArXiv: astro-ph 1509.04642, 2015.
HC: M.Hackstein, R.Chini, M.Haas, P.Abraham, A.Kospal, ATel No.6838, 2014. Rc = r(HC) - 0.14; Ic = i(HC) - 0.40.
HH: M.Hackstein, M.Haas, A.Kospāl, F.J.Hambsch, R.Chini, P.Abrahām, A.Moor, F.Pozo Nuniez, M.Ramolla, Ch.Westhues, L.Kaderhandt, Ch.Fein, A.Barr Dominguez, K.-W.Hodapp. Astron. and Astrophys. V.582, L12, 2015. V = V(HH)-0.10.
MM: V.P.Goranskij with the SAO 1-m Zeiss telescope and the multy-mode photometer polarimeter. V = V(MM) - 0.07; U = U(MM) + 0.12; I = I(MM) - 0.06.
MK: H.Maehara, T.Kojima, M.Fujii, ATel No.6770, 2014.
Pa: A.Kospal, P.Abraham, A.Moor, M.Haas, R. Chini, M.Hackstein, Astrophys. Journal V.801, 5, 2015 (Palomar atlas photometry).
pg: V.P.Goranskij eye estimates based on the Moscow SAI plate collection.
S: E.Semkov, ATel No.8019, 2015.
SO: V.P.Goranskij with the SAO 1 m Zeiss reflector and UBVRcIc photometer based on EEV 42-40 CCD. V = V(SO) - 0.16; B = B(SO) + 0.09; Rc = Rc(SO) - 0.05.