Monitoring requested for AT 2000ch (LMi)
Abstract:
Dr. Mojgan Aghakhanloo (University of Virginia) has requested AAVSO observers' assistance in monitoring the SDOR variable AT 2000ch (LMi) to document its next outburst. AT 2000ch, a supernova imposter, was originally thought to be a supernova (SN 2000ch) in NGC 3432. AT 2000ch has experienced at least 23 eruptions from 2000 to 2022. Eruptions occur approximately every 201 days. The next eruption is predicted around March 2024. Monitoring should begin immediately and continue for a month after the next outburst has concluded.
Justification:
AT 2000ch’s light curve shows that eruptions sometimes begin months before. It is crucial to monitor it for about a month before and after the proposed timeline. If the target is in eruption, observers should share images with Dr. Aghakhanloo for potential use in a paper.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| AT 2000ch | 17.40 | SDOR |
Cadence: Custom Precision: 100 |
Not Requested |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
R (Cousins), Other (Please Specify)
Comparison Stars:
Charts with comparison stars may be created using the AAVSO Variable Star Plotter (VSP, https://apps.aavso.org/vsp).
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Beginning immediately and continuing for a month after the next outburst has concluded, 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.
Additional Submission Location:
Not provided
Forum URL
N/A
Notes:
No public notes