Data sources:

DSS:Reduction of the Digital Sky Survey photographic images.
CC: Prediscovery observations by K.Kosaka (IAUC 6214,1995).
SP,SL:Scalnate Pleso and Stara Lesna observations from D.Chochol, T.Pribulla, Skalnate Pleso Contrib., Vol.27, 53 (1997) and D.Chochol, T.Pribulla, Scalnate Pleso Obs. Contr., Vol.28, 121 (1998).
AA: V.P.Goranskij, E.A.Karitskaya, A.V.Kusakin, T.M.Pogrosheva with 48- and 100-cm telescopes and WBVR photometer by V.G.Kornilov. Tien-Shan Astronomical Observatory, Kazakhstan.
Ko: V.P.Goranskij with WBVR photometer by V.G.Kornilov and 70-cm telescope of SAI Moscow Observatory;
M: U.Munari, V.P.Goranskij, V.P.Popova, et al., Astron. Astrophys. Vol.315, 166 (1996).
Me: N.V.Metlova with 60-cm telescope and photoelectric UBV photometer by V.M.Lyuty. SAI Crimean Station.
L: Other observers with the same photometer and telescope.
ShV,f79:V.P.Goranskij, E.A.Karitskaya,A.V.Kusakin, S.Yu.Shugarov with photoelectric UBV photometer by S.Shugarov and I.Volkov (Red - reduced observations in non-linear counting regime; f79-the same photometer with f79 photomultiplier in BVR mode. 70-cm telescope of SAI Moscow Observatory; 60-cm and 125-cm telescopes of SAI Crimean Station, Ukraine; 38-cm telescope of Crimean Astrophysical Observatory, Ukraine; 60-cm telescope of INASAN Zvenigorod Station in the Moscow region.
C6,C7,C8,A7,A47,VA,VJ,Pi: CCD observations by E.A.Barsukova, V.P.Goranskij, T.R.Irsmambetova, E.A.Karitskaya, N.A.Katysheva, A.V.Kusakin, N.V.Metlova, E.P.Pavlenko, S.Yu.Shugarov using CCD SBIG ST-6 (C6), ST-7 (C7), ST-8 (C8), Apogee-7 (A7), A47, Princeton Instruments VersArray (VA,VJ), Meade Pictor-416. 30 cm and 70-cm telescope of SAI Moscow Observatory; 60-cm, 125-cm reflectors and 50-cm Maksutov telescope of SAI Crimean Station, Ukraine; 38-cm telescope of Crimean Astrophysical Observatory, Ukraine.
SO: UBVRc photometry by V.P.Goranskij and E.A.Barsukova with CCD Elektronika-585 and EEV 42-40 and SAO 1-m telescope.
6m: V photometry by V.P.Goranskij and E.A.Barsukova with EEV 42-40 and SAO 6-m telescope.
A5: V photometry by V.P.Goranskij with the CCD Apogee Alta-F8300 and SAI Crimean Station 50-cm Maksutov telescope AZT-5.