Spectrum of Nova RS Oph 2021

Nova RS Oph 2021 (=V2575 Oph =HD 162214 =TYC 5094-550-1) is a bright recurring nova in constellation Ophiuchus. The discovery magnitude was 5.0 mag [1],[2]. The nova peaked around 8-9th June with a brightness of V=4.8 mag [3]. With this brightness it would be easily reachable with the Alpy600 spectrograph, it had been recorded short after it's maximum brightness. Up to now I took an image and a spectrum:

• 2021-08-10 Image, the sky was clear with good transparency, low humidity and avarage seeing, at temperature of 15° C
• 2021-08-13 Spectrum, the sky was mostly clear with some cirrostratus, low humidity and avarage seeing, at temperature of 17° C

Data about Nova RS Oph 2021

Image and spectra of Nova RS Oph 2021

2021-08-10 22:33 - 22:48 UT, Roof Observatory Kaufering, Omegon Photoscope 72/432 mm on Taurus GM-60 mount, CCD: ASI 178MC, exposures: 172x5 sec; click to uncrop image;

For other images see

• Sky&Telescope: The recurrent nova RS Ophiuchi just went into outburst — its first burst in 15 years — and it’s bright enough to see with the naked eye
• Astronomy Now: RS Ophiuchi in a rare outburst to naked-eye visibility
• Universe Today: Skywatcher’s Delight: Nova RS Ophiuchi in Outburst and Comet O1 Nishimura
• Astro Manni: Nova RS Oph im Sternbild Schlangenträger

Here are my spectra of this nova:




2021-08-13 22:39 - 22:57 UT, Roof Observatory Kaufering, Meade 14" ACF telescope on Taurus GM-60 mount, Astro Physics reducer CCDT67, Alpy600 with guiding unit, CCD camera: Atik 428EX, guiding camera: ASI 120 MM; recording software: AstroArt, guiding software: PHD2;
Wavelength calibration: Hg lines from energy saving lamp and Ne lines from flicker flame light bulbs, instrumental response calibration: with reference star HIP 86284 (=HD 159975), B8 II((Mn)), data reduction: with Integrated Spectrographic Innovative Software from Christian Buil;
The spectral type of HIP 92934 may be unprecise in Simbad (character C). I achieved the best fit with a type of B8 V database spectrum.

• calibrated spectrum: _nrsoph_20210813_cal.fit

Line identification and discussion

Here is the labelled spectrum:


There are strong emission lines of Hydrogen, Helium and Iron. This is also shown in the atlas of spectroscopic evolution [4].

References:
[1] Nova RS Oph 2021 in vsnet-alert 26131
[2] Nova RS Oph 2021 in AAVSO alert notice 752
[3] Nova RS Oph 2021 in RS Oph outburst in Sky&Telescope
[4] U. Munari et al., The 2021 outburst of RS Oph. A pictorial atlas of the spectroscopic evolution: the first 18 days (PDF, engl.)



My other spectroscopic observations: Spektroskopie (German)

[ updated: 2023-02-16 | Gregor Krannich | Gregors astronomy page ]