Tue, 03/02/2021 - 14:34
AAVSO Alert Notice 732 announces a campaign on the long period eclipsing binary ASASSN-21co. Please see the notice for details and observing instructions.
There are threads for this campaign under the following forums:
- Campaigns and Observation Reports: https://www.aavso.org/asassn-21-co-campaign
- Eclipsing Binaries: https://www.aavso.org/asassn-21-co-campaign-01
- Spectroscopy: https://www.aavso.org/asassn-21-co-campaign-02
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
Nice to see that visual observations are welcome, thany you for us !
So I'll send this alert to my contacts.
FYI : The two last links are off.
Thank you very much for letting me know about the links to the EB an Spectroscopy forums. Those links now work.
Submitted BSM network proposal for BVRI data this morning.
ASASSN-21co is starting to show some interesting behavior. Although the eclipse has only just begun, it appears the light curve is starting to flatten, and possibly brightening based on ASAS-SN data...
[ Link to latest ASAS-SN data for ASASSN-21co ... https://asas-sn.osu.edu/sky-patrol/coordinate/8cc5012f-1b59-498c-a748-2845fb681423 ]
The LCG plots are also showing a similar flat trend at the moment. It will be interesting to watch over the next days as more data comes in and see what happens.
Cameron (MCJC) :-)
Yes, based on the previous ASAS-3 eclipse, totality lasts 21 days or so and mideclipse will take place around March 12.
Thanks for the information, Sebastian. How would I access the historical ASAS-3 eclipse data?
sorry for my late reply, I was on vacation.
You can always find ASAS-3 data following the VSX external links, so if you go to the VSX page for the star, you will be one click away.
Anyway, you can get the data from here.
Thanks for that, Sebastian. Much appreciated. Cameron :-)
I took a spectrum of ASASSN-21co on saturday night. It appears to be an m2 spectral type but also seems to ramp up at the blue end like an A or B. I posted on the spectroscopy page to ask where to submit data but no response yet.