Search found 132 matches

by Daniel Dejean
Tue Aug 10, 2021 5:37 pm
Forum: Novae
Topic: Probable nova in Hercules mag 6.4 !
Replies: 39
Views: 25215

Re: Probable nova in Hercules mag 6.4 !

Hello Juan, Congratulation for that impressive result with a magnitude near 15 at full moon ! Apparently your sky is showing almost no pollution. Excellent site for observation. Not sure to unsdestand your question regarding the guiding camera. Why to increase the exposure time above a few seconds ?...
by Daniel Dejean
Tue Aug 10, 2021 5:08 pm
Forum: Novae
Topic: Symbiotic recurrent nova RS Oph in ourburst !!!
Replies: 112
Views: 147694

Re: Symbiotic recurrent nova RS Oph in ourburst !!!

Hello,
My modest contribution at (very) low resolution around 350. Not the best setup at such magnitude level... :)

Image
by Daniel Dejean
Tue Jul 13, 2021 6:40 am
Forum: Novae
Topic: Probable nova in Hercules mag 6.4 !
Replies: 39
Views: 25215

Re: Probable nova in Hercules mag 6.4 !

Congratulation to Juan José for the spectra at magnitude 14. Not an easy task... Many thanks to "admin" for the comments and advise helping us to better understand what we see in low resolution. At this level of magnitude it may be difficult to get additional data in high resolution. As pe...
by Daniel Dejean
Sun Jul 11, 2021 12:33 pm
Forum: Novae
Topic: Probable nova in Hercules mag 6.4 !
Replies: 39
Views: 25215

Re: Probable nova in Hercules mag 6.4 !

While most of the emission lines appear as large rectangular bands, there is a strange triangular structure moving from 4640A on june15 to 4680A on my last spectra on july09. After some doubts regarding a possible shift in calibration I came to the conclusion it could be the result of a blending eff...
by Daniel Dejean
Sat Jul 10, 2021 8:36 pm
Forum: Novae
Topic: Probable nova in Hercules mag 6.4 !
Replies: 39
Views: 25215

Re: Probable nova in Hercules mag 6.4 !

An other observation yesterday night July09. The magnitude (source AAVSO) is now near 14 with obvious impact on S/N level. Result is shown in the chart below (blue curve). Compared to previous observation of July04, there is no major change. The intensity of the neon bands (NeIII 3869 / 3968) versus...
by Daniel Dejean
Thu Jul 08, 2021 9:24 am
Forum: Novae
Topic: Probable nova in Hercules mag 6.4 !
Replies: 39
Views: 25215

Re: Probable nova in Hercules mag 6.4 !

Poor weather condition since a few days…This is an opportunity to spend more time on my previous observations. To better understand the changes in lines intensity, I am using the excellent example from François Tessier and observers team for Nova Monocerotis 2012. If my understanding is right , the ...
by Daniel Dejean
Mon Jul 05, 2021 2:31 pm
Forum: Novae
Topic: Probable nova in Hercules mag 6.4 !
Replies: 39
Views: 25215

Re: Probable nova in Hercules mag 6.4 !

Nouvelle observation dans la nuit du 04 juillet malgré un ciel légèrement voilé. La luminosité baisse encore (magnitude 13) mais le rapport S/N me paraît encore acceptable en basse résolution (350) avec 6 poses de 900s. Ce dernier spectre est présenté en bleu sur le graphique ci-dessous qui donne au...
by Daniel Dejean
Thu Jul 01, 2021 9:12 pm
Forum: Novae
Topic: Probable nova in Hercules mag 6.4 !
Replies: 39
Views: 25215

Re: Probable nova in Hercules mag 6.4 !

Au soir du 30/06/2021 la magnitude de cette nova est maintenant d'environ 12.5. Elle est plus difficile à reconnaître sur l'écran de la caméra de guidage mais reste toutefois bien visible Atik314 / champ 30 ' http://www.dejean.ovh/spectro/image_guide30juin21.png le profile du spectre obtenu est rela...
by Daniel Dejean
Sat Jun 26, 2021 9:00 pm
Forum: Novae
Topic: Probable nova in Hercules mag 6.4 !
Replies: 39
Views: 25215

Re: Probable nova in Hercules mag 6.4 !

La météo n’est pas très favorable avec de nombreux orages dans la région de Toulouse, mais une éclaircie hier soir 23/06/21 m’a permis de revenir sur la Nova dans Hercule. Par rapport au 15/06, la luminosité a baissé comme attendu avec une magnitude voisine de 11.5 . Le spectre reste bien lisible av...
by Daniel Dejean
Wed Jun 16, 2021 9:56 pm
Forum: Novae
Topic: Probable nova in Hercules mag 6.4 !
Replies: 39
Views: 25215

Re: Probable nova in Hercules mag 6.4 !

Modeste contribution lors du test d’une configuration volontairement dégradée d’un Alpy avec une fente de 35microns et une caméra Atik428EX en bin2x2. La résolution obtenue n’est que d’environ 380 mais peut-être intéressante dans certaines situations : raies larges et faible luminosité (ce n’est pas...