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Contact Form Spectroscopic observations nova Cas 2021 - V1405 Cas

Yuji Nakamura (Kameyama, Mie, Japan) has reported the discovery of a possible nova, PNV J23244760+6111140, on March 18.4236 2021.

ATel #14471 reports spectroscopic classification of the object as a classical nova (Hiroyuki Maehara (National Astronomical Observatory of Japan), Kenta Taguchi (Kyoto University), Yusuke Tampo (Kyoto University), Naoto Kojiguchi (Kyoto University), Keisuke Isogai (Kyoto University).

 The spectrum shows prominent Balmer series and He I emission lines with P-Cyg profiles. The absorption component of P-Cyg profile in He I 5876 line is blue-shifted by ~1600 km/s with respect to the emission peak. He II 4686 and N III 4640 lines are also seen in emission. These features suggest that the object is a classical nova.

Nova Cas 2021 is at RA 23 24 47.73 Dec +61 11 14.8 (J2000.0)

Observation with C11 + LhiresIII with 2400l/mm grating and SX 814 ccd-camera for H-alpha detail @ 6562.801 Å.

Plot of the expansion speed of the ionised H-cloud in km/sec.

date of observation

expansion velocity (km/sec)


1342 km/sec


975 km/sec


655 km/sec


652 km/sec

Data available for download on ARAS novae database and AAVSO AVSpec database

Animation of the H-alpha-detail @ 6562.801 Å of my observations, started on 25 march 2021

Spectra: plots  for several days for H-alpha detail @ 6678 Å - range 6500 Å to 6630 Å

spectra nova V1405 Cas 2021, Erik Bryssinck