V604 Aquilae

V604 Aquilae or Nova Aquilae 1905 is a nova which was first observed in the constellation Aquila in 1905 with a maximum brightness of magnitude 7.6.^[3] It was never bright enough to be seen with the naked eye. It was discovered by Williamina Fleming on a Harvard College Observatory photographic plate taken on August 31, 1905.^[6] Examination of plates taken earlier indicates that peak brightness occurred in mid-August 1905.^[7] The star's quiescent visual band brightness is 19.6.^[5]

V604 Aquilae or Nova Aquilae 1905

A light curve for V604 Aquilae, plotted from data published by Walker (1933)[1]
Observation data Epoch J2000      Equinox J2000
Constellation	Aquila
Right ascension	19h 02m 06.33s[2]
Declination	−04° 26′ 43.2″[2]
Apparent magnitude (V)	7.6(blue) – 19.6(V)[3]
Astrometry
Absolute magnitude (MV)	-8.3[4]
Characteristics
Spectral type	pec(Nova)[3]
B−V color index	0.3[5]
Variable type	NA[3]
Other designations
Nova Aquilae 1905, CSI-04-18594, SV* HV 1175, AAVSO 1856-04, AN 104.1905, HD 176779.
Database references
SIMBAD	data

The location of V604 Aquilae (circled in red)

V604 Aquilae faded by 3 magnitudes in just 25 days, making it a "fast nova".^[6] Detection of a faint nebula surrounding the star, with a radius of 0.4 arc minutes, was reported early in 1906.^[8] In 1994, a photometric study detected brightness variations of up to ~0.45 magnitudes on timescales of about one hour.^[9] An attempt to detect cool molecular gas surrounding the nova in 2015 was unsuccessful.^[10]