■ V5588 Sgr (=Nova Sgr 2011 No.2) : rising !
We began to perform the optical and near-infrared photometric observations of V5588 Sgr (=Nova Sgr 2011 NO.2) since Mar. 28. This object was discovered at 11.7 mag in CCD photometry on Mar. 27.8 by NIshiyama and Kabashima. Thereafter, Arai et al. performed the spectroscopic observations of this object. The spectrum exhibits the strong H-alpha and FeII emission lines. The FWHM of H-alpha is estimated to be 900 km/s. These characteristics indicate that this object could be classified into relatively slow FeII nova. Our preliminary photometric results show the slowly-brightening to its maximum in optical and nera-infrared wavelength. It indicates that this nova is evolving on its very early-phase. The observational information is important and rare for a classical nova. We will continue the observations.
We performed the near-infrared photometric observations of V1723 Aql. The near-infrared flux is clearly detected by TRISPEC at the 180 days after discovery. This nova underwent the dust formations in its early phase. We find that the near-infrared flux show a bit decline comparing with that at 80 days after discovery. We will continue the near-infrared observations.