American Association of Variable Star Observers (AAVSO)
Fri, 02/12/2021 - 16:38

AAVSO Alert Notice 729 announces a campaign beginning immediately on the black hole LMXB V406 Vul (XTE J1859+226). Please see the notice for details and observing instructions.

There are threads for this campaign under the following forums:

- Campaigns and Observation Reports:
- Spectroscopy:

Please subscribe to these threads if you are participating in the campaign so you can be updated by the astronomer and by HQ. Join in the discussion or ask questions there!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

My AAVSONet proposal to…

My AAVSONet proposal to follow V406 VUL in B,V,R and I was submitted and accepted today. Looks like good comps very close to the target, even for small FoV cameras.



American Association of Variable Star Observers (AAVSO)
Outburst declining?

Thanks to everyone who is contributing observations!

At the moment it looks like this outburst is fading rather than brightening--ZTF data from last night puts the object at r~20.  Let's continue keeping an eye on it; either continued fading to quiescence or a rebrightening may be possible.

American Association of Variable Star Observers (AAVSO)
Closing the campaign due to return to quiescence

Recent observations suggest that the source has returned to near the quiescent level, so barring a re-brightening into a new outburst I suggest we consider this campaign closed.

Thank you to everyone who contributed observations!  I will follow up with you individually concerning paper authorship.