Nova RS Oph

The last outbreak of RS Oph was reported on August 8, 2021 (see AAVSO Alert Notice 752). RS Oph is a cataclysmic variable belonging to a small subgroup of novae called recurrent novae (of which there are only 7 confirmed members).

We report calibrated photometric measurements of RS Oph gathered in three nights of observation.

Setting:

Location: Siding Spring Observatory, Australia
Telescope: 0.4m LCOGT
Date: August 28, September 2 and September 7
Camera: SBIG STL 6303E
Filter: VB (Jonhson) and g’, r’, i’, z’ (SDSS)
Exposure: 6s (V), 22s (B), 7s (g’), 4s (r’), 12s (i’) and 22s (z’)
FOV: 29.2 x 19.5
Observers:  Julio Vannini, Jose Ricra and Nobar Baella

Calibrated standard magnitudes:

The astrosource software (Fitzgerald et al. 2021) and APASS DR10 catalog used for the photometric calibration process.

DATE	HJD	Filter	N images	Mag
2021-08-28	2459455.98361	B	13	8.809 ± 0.002
	2459455.98409	V	13	8.222 ± 0.001
	2459455.98331	g’	13	8.235 ± 0.001
	2459455.98303	r’	13	6.615 ± 0.001
	2459455.98276	i’	13	7.166 ± 0.001
	2459455.98221	z’	13	6.215 ± 0.001
2021-09-02	2459459.92085	B	10	9.117 ± 0.003
	2459459.92133	V	10	8.525 ± 0.003
	2459459.93899	g’	10	8.533 ± 0.003
	2459459.93871	r’	10	6.895 ± 0.001
	2459459.93843	i’	10	7.464 ± 0.002
	2459459.93788	z’	10	6.507 ± 0.005
2021-09-07	2459464.93434	B	14	9.509 ± 0.002
	2459464.92602	V	14	8.985 ± 0.001
	2459464.92842	g’	14	8.913 ± 0.002
	2459464.93386	r’	14	7.152 ± 0.001
	2459464.94932	i’	14	7.865 ± 0.002
	2459464.95213	z’	14	6.77 ± 0.02

Image in filter r’:

This work makes use of observations from the Las Cumbres Observatory global telescope network.