Alert Notice 771: V1117 Her in deep fade again

Active Dates: March 9, 2022 – Oct. 31, 2025


Abstract:

AAVSO Young Stellar Object (YSO) Section leader Michael Poxon requests coverage of the YSO V1117 Her, which is at a deep minimum of visual magnitude 15.1 as of 2022 March 9.45 UT. Continuing coverage is requested to monitor this YSO.

Justification:

V1117 Her has experienced deep minima at semi-regular intervals of about 400 days. However, the last comparable minimum was only about 100 days ago, indicating potential new processes in the circumstellar environment.

Requested Data Types:

Photometry



Targets
Name Magnitude Variability Type Photometry Notes Spectroscopy Notes
V1117 Her 12.20 UXOR

Cadence: Nightly

Precision: 100

Not Requested

Spectroscopy Lines:

No spectroscopy lines provided

Photometry Filters:

V (Johnson)

Comparison Stars:

Finder charts with comparison stars are available via the AAVSO Variable Star Plotter (VSP, https://apps.aavso.org/vsp/).


Co-Authorship

Observers are not eligible for co-authorship.

Additional Observer Input:

Not provided

Additional Submission Location:

Not provided



Notes:

Principal Investigator: Michael Poxon; Imported Campaign (Alert Notice #771)