Continued monitoring requested for PSN J12355230+2755559 (Com)
Abstract:
Following on AAVSO Alert Notice 847 (January 2024), Dr. Mojgan Aghakhanloo (University of Virginia) has extended her request for AAVSO observers' assistance in monitoring the very interesting SDOR variable PSN J12355230+2755559 (= AT 2016blu) (Com) to document its behavior throughout 2025 at least.
Justification:
Dr. Aghakhanloo writes: "AT 2016blu has experienced at least 19 outbursts from 2012 to 2022. We found that AT 2016blu's outbursts occur approximately every 113 days. Subsequent to the AAVSO observing campaign's start in January 2024, at least 6 brightenings were observed by the campaign's end in July. Recent observations from the Zwicky Transient Facility (ZTF) show it was bright in December 2024, and was above minimum on January 5, 2025, around the time that a brightening event was expected. As the light curve of AT 2016blu shows brief, multi-peaked outbursts that sometimes occur before or after the expected periastron time, and as this object's light curve is complex, it is crucial to monitor it over the coming months.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| PSN J12355230+2755559 | 16.60 | SDOR |
Cadence: Not Specified Precision: 100 |
Not Requested |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
R (Cousins), r (Sloan)
Comparison Stars:
Finder charts with comparison stars may be created using the AAVSO's Variable Star Plotter (VSP; https://apps.aavso.org/vsp/). It is recommended to use the 'F' scale chart to see the nearby comparison stars.
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
R band (Cousins or Sloan) CCD photometry is requested. Unfiltered observations reduced to an R zero-point (CR) are also welcome. Nightly observations are requested, with a higher cadence (several observations per night) if the target is in outburst. DSLR and visual observations are not requested. PSN J12355230+2755559 has a range of 16.6 r - 20.4 G, and shows 2-3 magnitude outbursts. It is a challenging target not only because of its magnitude but also because of its location - in NGC 4559C (= IC 3550), an HII region of NGC 455 with consequent nebulosity.
Additional Submission Location:
Not provided
Notes:
No public notes