ASASSN-24fw Estimated End of Eclipse Time
ATel #16919; V. R. Bhaskaran Nair, D. Denisenko
on 24 Nov 2024; 15:46 UT
Credential Certification: Denis Denisenko (d.v.denisenko@gmail.com)
Subjects: Optical, Binary
Following the discovery of deep dimming event in ASASSN-24fw (ATel #16833) we have analyzed the archival Harvard observatory data using the DASCH Project web site at https://dasch.cfa.harvard.edu/ (Grindlay et al., 2012). Two previous dimming events were found in 1981 and 1937, respectively. Folding the DASCH data with the recent 2024 ASAS-SN observations we have found the best eclipse period to be 16000+/-2 days, or 43.8 years. The eclipse duration is about 1.6 per cent of the orbital period, or approximately eight months. The zoomed phase plot showing the part of the light curve from -0.02P to 0.02P is posted at https://scan.sai.msu.ru/~denis/ASASSN-24fw-phased_LC.gif
The following preliminary light elements were obtained:
T (MJD) = 2428699 + 16000 * E, where E=0 corresponds to the middle of 1937 eclipse, E=1 - to 1981 and E=2 - to 2025 January 24th.
We predict the current deep fading to last until the end of May 2025, after which the egress from the eclipse should start. The follow up observations are encouraged.
VSX Detail for ASASSN-24fw
