Mag approximately 14 using comparison stars on the AAVSO chart. V2104 Aql is a classical nova discovered by M. Ning and H. Lin, a team of Chinese astrophysicists, on July 1, 2026.
More information :

https://www.astronomerstelegram.org/?read=17900

AT2026rdg (= ZTF26abemjfk) discovered 2026/07/01.305 at R.A. = 19h14m31s.366, Decl. = +12°03'53".60 Mag 12.5:7/1, Type Fe II (References: ATEL 17867, ATEL 17868, ATEL 17817, TNS, ZTF observations)

Discovery page (References: TNS):
https://www.wis-tns.org/object/2026rdg

Time: 18:42UT 2026-09-18 Exp. 12 x 30 sec. Tel. 0.254m f/5.8 ST-10XME CCD @ -15°C 1.9"/pix

Time: 20:36UT 2026-09-04 Filter & Exp. R(40x30) G(40x30) B(40x30)Sec
Tel: C14 @ f/6.6 Camera ASI 174 MM Mini Mono @ +9°C 1"/pix Paramount GT-1100S
Odd Trondal Obs.code 238 (Uranium). Oslo Norway