Electronic Telegram No. 5711
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


V2104 AQUILAE = NOVA AQUILAE 2026
     A possible nova (red mag 12.5) that was discovered by Min-rui Ning (who
is apparently from Urumqi, Xinjiang, China), together with Hui-xuan Lin 
(Institute of Astronomy, National Central University, Taoyuan City, Taiwan) in 
the course of the "Zwicky Transient Facility" (ZTF) survey from three 200-s 
CCD exposures taken on July 1.395 UT using the 1.2-m Schmidt telescope at 
Palomar was found as part of the "Daily Cataclysmic Variable Alert Project"; 
Ning provided a position R.A. = 19h14m31s.37, +12d03'53".6 (equinox J2000.0) 
for the variable.  Comparison was made with the Digitized Sky Survey, but no 
mention was made of limiting magnitude or date of the DSS image referred to
(see website URL https://www.wis-tns.org/object/2026rdg/discovery-cert).  An 
independent discovery at mag 11.8 was apparently made by K. Sokolovsky 
(University of Illinois) et al. from an unfiltered CCD image obtained on July 
1.836 using an SBIG camera (+ Canon 135-mm-f.l. f/2 telephoto lens) located 
at the Astroverty astrofarm in Nizhnii Arkhyz, Karachay-Cherkessia, Russia,
in the course of their "New Milky Way Survey"; the provided position end 
figures for the variable are 31s.29, 53".4.
     Spectroscopy (range 385-905 nm) obtained by U. Munari (Padova) et al. on 
July 2.865 UT with the Varese (Italy) 0.84-m telescope shows broad Balmer 
emission lines (FWHM about 1100 km/s) flanked by P-Cyg absorption lines that 
are blueshifted by 680 km/s, together with O I 777.2-nm and Fe II lines; there 
is strong indication of interstellar reddening.  The spectrum resembles that 
of a "Fe II"-class nova near maximum brightness; details are reported at 
website URL https://www.astronomerstelegram.org/?read=17867.  Munari et al. 
add that nothing appears within 2".7 of the nova to red mag 20.4 (Pan-STARRS1 
imaging; no date provided) or red mag 17.4 in the Gaia DR3 catalogue.
     Magnitude estimates of this nova reported to the Central Bureau:  July 
2.028 UT, 11.1 (W. Souza, Sao Paulo, Brazil; SeeStar S50 camera; "tri-color 
green" images); July 3.07, 12.0 (J. G. de S. Aguiar, Campinas, Brazil; visual 
and in moonlight).
     E. Kazarovets (Institute of Astronomy, Moscow) writes that the permanent
GCVS designation V2104 Aql has been assigned to this nova.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2026 CBAT
2026 July 4                      (CBET 5711)              Daniel W. E. Green