October 22, 2021
AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Campaigns and Observation Reports: https://www.aavso.org/v1117-her-fading-01
- Young Stellar Objects (YSO): https://www.aavso.org/v1117-her-fading
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AAVSO Young Stellar Object (YSO) Section leader Michael Poxon (Great Plumstead, Norfolk, UK) requests coverage of the YSO V1117 Her beginning immediately.
He writes: "AAVSO observer John Pickett (PKT, Corona, AZ) has observed that the anomalous UXOR V1117 HER 'has faded over two magnitudes, apparently overnight'. His observations as of 2021 October 19.0833 UT have it at 15.029 TG +-0.17, down from 12.800 on Oct. 10. Observations of this important object are especially valuable as it begins to lose altitude from mid-northern latitudes."
The fading was confirmed by Sjoerd Dufoer (DFS, Brussels, Belgium), whose observation in the AAVSO International Database shows V1117 Her at 14.241 V +/-0.049 on 2021 October 19.8294 UT.
"Observations in the B and I bands are especially welcome. V band photometry is encouraged, and visual observations are welcome. Observations two-three times per night are requested (and once per night between episodes of activity)." V1117 Her has a range of approximately V = 12.3 - <13.9.
Coordinates (2000): RA 16 39 06.43 Dec. +09 47 55.3 (from VSX entry for V1117 Her)
Charts: Finder charts with comparison stars for V1117 Her may be created using the AAVSO Variable Star Plotter (VSP).
Submit observations: Please submit observations to the AAVSO International Database using the name V1117 HER.
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen using material provided by Michael Poxon.
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