SIMBAD references

Photoelectric and CCD magnitudes (unfiltered unless otherwise noted): Apr. 21.023 UT, 10.0 (L. Urbancok, SAO Observatory Sid, Slovakia); 24.052, 9.3 (Urbancok); 27.017, V = 9.937 ± 0.015, B-V = -0.06 ± 0.03 (M. M. M. Santangelo, Capannori, Italy, 0.30-m telescope + SSP-5A photometer; comparison star HDE 331152); Visual magnitude estimates (cf. IAUC 8935; CBET 1354): Apr. 24.075 UT, 9.6 (K. Hornoch, Vohancice, Czech Republic); 24.949, 9.5; 26.137, 9.6 (P. Schmeer, Bischmisheim, Germany); 27.132, 10.1 (Schmeer); 28.135, 10.8 (Schmeer); 28.913, 11.4 (Hornoch); May 3.941, 11.6 (Hornoch); May 6.917, 11.9 (Hornoch);.