Request for immediate photometric monitoring of the fading star ASASSN-V J060000.76-310027.83
Active Dates: Oct. 25, 2019 – None
Abstract:
The ASAS-SN telescope network discovered a gradually fading star, ASASSN-V J060000.76-310027.83, which has a quiescent mean magnitude of g~14.2 (V~13.6). The star gradually faded from g~14.2 on UT 2019-10-25.35, to g~15.1 on 2019-12-11.16, and monitoring has shown the star fade by up to 0.3 magnitudes over one night. The star is a nearby (d~155pc) K5 dwarf star that shows no infrared excess, ruling out R Cor Bor and warm dust 'dipper star' explanations. The leading hypothesis is that the occulting object is a dust disk around an unseen secondary companion, about 0.1au in diameter and containing detailed substructure similar to that seen towards J1407, PDS 110, and Boyajian's star. Photometry in any broadband filter from B to I band is requested, preferably with a cadence of 4 points per hour whenever the star is visible. Our best estimate is that the eclipse will last another 10 days, but this is very uncertain.
Justification:
Monitoring the variable star ASASSN-V J060000.76-310027.83 is important because the leading hypothesis is that the occulting object is a dust disk around an unseen secondary companion, which could provide valuable insights.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| ASASSN-13aa | 13.90 | UG |
Cadence: Not Specified Precision: 100 |
Not Requested |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
No photometry filters provided
Comparison Stars:
No comparison stars provided
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Not provided
Additional Submission Location:
Not provided
Notes:
Principal Investigator: M. Kenworthy; Imported Campaign (Alert Notice #691)