A new nova in Cassiopeia, discovered on March 18th, is bright enough to see in a small telescope.
"Like a spring flower, a bright, new nova has bloomed from the dark earth of Cassiopeia. Yuji Nakamura of Japan discovered the object at magnitude 9.6 in four images he took with a 135-mm lens on March 18th. Four days prior, nothing was visible at the location down to magnitude 13.
Within a day, Nova Cassiopeiae 2021 received its permanent designation, V1405 Cas.
Classical novae like V1405 Cas are close binary stars comprised of a compact white dwarf and either a main-sequence star like our Sun or a red giant.
Astronomers at the National Astronomical Observatory of Japan measured ejected material moving away from V1405 Cas at 1,600 kilometers per second (3.6 million miles per hour).
When a new nova comes to light, astronomers try to identify it with a previously known star. V1405 lies just 0.12″ from the W UMa-class (denoted EW) eclipsing-binary star CzeV3217, close enough that the latter appears to be the nova’s progenitor." shorturl.at/jquEN

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This project has been pending for a long time but with a lot of desire to do it because it captured an event that we had never witnessed before, such as the appearance of the Nova V1405 Cas.

Although a few months passed after its appearance, Maurizio was able to verify that it was active and so he decided to do sessions at the end of August, several in September and the last session on October 1st, but this time in addition to the Nova, he included in the same frame both the Bubble and the NGC 7538 to finally have the entire area covered properly.

On the other hand we had the data from the previous year where we made our first project of this fascinating NGC 7635 Bubble Nebula and with this image, the possibility of being able to make a faithful comparison of the binary star system that caused the appearance of the Nova.

Separate stacks were made from the sessions done with L-Pro and Extreme filters. The Extreme sessions also had the extraction of Ha and [OIII], and then a combination of channels was made H - H.3+[OIII].7- [OIII] where the dominance of [OIII] was seen immediately reflected in the Bubble and surroundings as well as in the flower cone of nebula NGC 7538.

Then I did the usual images combination mix, as the result of the DSS Extreme one give some red contrast I liked while the image result from the extraction Ha and [OIII] for one side and the normal Siril stack in the other, show more the Ha expansion in the area captured.

The sessions turned out to offer a lot of information in this area of ​​the Ha despite having been held at Bortle 6 in our backyard. It is fascinating to observe how the ionized gas is expanded. Surprising for us to observe the shape of the nebula NGC 7538 and the dark dust zones it has.

Once the image was finished, I proceeded to overlay it on the image of the Bubble Nebula that was made in Dec 2021 with sessions done in February, March and November 2020 and the star or binary system where the Nova originated could be clearly observed.

In addition, the luminosity of V1405 Cas that we were able to capture it was of such magnitude that it produced the usual spikes of our Newtonian telescope, really impressive!

In the attached revisions are the 2020 and the present work images with the nova position marks, other with both images overlay in semi transparency and the details with V1405 Cas marks.

Through the AAVSO website https://www.aavso.org/ (American Association of Variable Star Observers) you can search for information on how the brightness of the Nova has evolved and the result is the graph placed in Revision X. It was interesting note that precisely in the month of Sept. the brightness of the Nova was high, and can be observe according to the days of the sessions, the magnitude ranged between 8.1 to 6.56.

Thanks for visit us and see our work, we hope you enjoy it.

Processed May 2022

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