SIMBAD references

Additional magnitudes for 2011hj (via unfiltered CCD unless noted otherwise): 1991 May 19, [19.8 (Digitized Sky Survey, red plate; via Gao); 1991 May 20, [21 (Palomar Sky Survey red image, via the Digitized Sky Survey; reported by Vitali Nevski, Vitebsk, Belarus); 2011 Oct. 15, [19.0 (Gao); Oct. 27.704 UT, R = 17.2 (Nevski; position end figures 22s.26, 46".2; reference stars from UCAC-3 catalogue); Oct. 29.946, R = 17.7 (Federica Luppi, Varese, Italy, 0.36-m f/7.9 reflector + Bessell R filter; position end figures 22s.22, 46".0; reference stars from PPMXL catalogue; image posted at website URL http://www.astrogeo.va.it/pub/TOCP/PSN_P2692384.jpg).