I wish to suggest visual observers from Southern Hemisphere to look at the AGN LEDA 90443 (located ~ 34’ east-southeast from the star i Carinae). Perhaps, the object is showing a peak of activity. More observers should confirm the situation.
Hello Adriano,
when we created the comparison star sequence for this AGN, we shared the current ASAS-SN light curve with you, and it shows that over the last 12 years it has only varied by 0.25 mag or so (V= 12.95-13.2):
https://asas-sn.osu.edu/sky-patrol/coordinate/6a14d8a4-d883-45e7-8689-2403c31a15cd
The red and yellow points are g-band magnitudes, ~0.25 mag. fainter or so than the aqua-coloured observations that are in V.
The total range over the years is larger, reaching 0.8 mag.
But there is nothing indicating “a peak of activity”. What is the reason why you said that?
Cheers,
Sebastian
Hello, Mr. Sebastian Otero. Because I’m detecting the object slightly above the limit of my current equipment (Newtonian 114mm) = magnitude 12.8 at zenith in my observing site. I’ve used the sequence and choose a star of magnitude 12.3, as comparison star, and other, of magnitude 12.8, as check star, noting the object was somewhat between these values of magnitude.
So, I’ve detected positively the comparison star and LEDA 90443, but, the check star (magnitude 12.8) wasn’t detected. With some uncertainty, I’ve estimated a magnitude of 12.5, considering the limit of my equipment, as explained above.
Thanks