The eruptive variable V1118 Ori is now in outburst again
ATel #8100; D. Lorenzetti (INAF, Osservatorio Astronomico di Roma, Monte Porzio, Italy), A. A.Arkharov (St. Petersburg Observatory, Russia), A. Di Paola, T. Giannini, S. Antoniucci (INAF, Osservatorio Astronomico di Roma, Monte Porzio, Italy), V. M.Larionov (Astronomical Institute of St. Petersburg University, Russia; St. Petersburg Observatory, Russia)
on 27 Sep 2015; 21:56 UT
Credential Certification: Dario Lorenzetti (dloren@mporzio.astro.it)
Subjects: Infra-Red, Variables, Pre-Main-Sequence Star
Referred to by ATel #: 8548
After a long lasting period of quiescence of about a decade (Lorenzetti et al. 2015 ApJ 802, 24), the source V1118Ori, one of the most representative member of the EXOr variables (Audard et al. 2014 PPVI p.387) is now outbursting. On 2015 Sept. 21 (JD 2457286) we detected V1118 Ori in the near-IR (JHK bands) at a flux level increased by more than 1 mag. Observations have been carried out at the AZT24 1m IR telescope (Campo Imperatore, Italy): the obtained photometric values are J = 11.36 mag, H = 10.67 mag, and K = 9.93 mag. Likely, as already occurred during the last outburst on 2004/2005 (Audard et al. 2005 ApJ 635, 81; Lorenzetti et al. 2005 AA 453, 579) the increasing trend is the beginning of a new outbursting phase that will continue during the next months, hence spectro-photometric observations in the optical and near-IR range are strongly encouraged.
