Proposal #611

Need 3xBVRI or as many JC filters as available and 3 to 4 nights weekly.

ASASSN-25cd 4 lies in Sagittarius.

18 31 52.79 -28 48 26.7 (277.96996 -28.80742)

The linear fading trend and the previous lack of variability suggest it might be a long period eclipsing binary. The star stayed constant in previous years of ASAS-SN data (2016-2025) and also in ASAS-3 data (2000-2009).

It is a K-type giant so it might be an EA/GS.
It seems to have reached a minimum magnitude of 15.0 g but we need more data to see if that is indeed the bottom of the “eclipse”.
In EA/GS systems, amplitude varies strongly depending on passband, because a late type star is usually eclipsed by a hotter fainter object.
We now only have ASAS-SN g data. It would be interesting to have multicolor photometry to see if the amplitudes are indeed that different.