American Association of Variable Star Observers (AAVSO)
Sat, 11/07/2020 - 21:34

i'm observing nsv14809 range 5.7 5.8 but the star maybe "disappear".... i see only the comparison star (5.8) ,perhaps chart error?

thank you


American Association of Variable Star Observers (AAVSO)
NSV 14809 = the 58 comp star

Hello Massimo,

This star is probably constant or only very slightly variable. I wouldn't recommend observing it. Variations may be spurious and due to the fact that this is a close binary (5.8 and 8.9 Vmag. components with a current separation close to 0.4") with a 26.3 yr. period.
Its coordinates were wrong. I have corrected them but even then, charts will show it at a different position from where it actually is because it is a very large proper motion star and charts are made using the J2000.0 position. It is 25" or so away form the chart position now.
Anyway, there is no way to misidentify it because it is a 5.8 mag. star so it is the brightest star in the area.
You mentioned a 58 comparison star, well, this is NSV 14809 itself, there is only one object there. Since its variability is very small or non existent, it is also used as a comparison star.

Are you observing it with a DSLR or visually?
Again, I don't recommend observing it.