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
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) :-)
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.