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THE ASTRONOMER Electronic Circular No 3688      2022 Mar 15 11.23UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.ORG.UK           Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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V1117 HER IN DEEP FADE

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-01

Please subscribe these threads if you are participating in the campaign so
you can be updated by the astronomer and by HQ. Join in the discussion or
ask questions there!

AAVSO Young Stellar Object (YSO) Section leader Michael Poxon (Great
Plumstead, Norfolk, UK) requests coverage of the YSO V1117 Her beginning
immediately.
He writes: "The anomalous YSO (possibly debris-disc object) V1117 Herculis
is at a deep minimum of visual magnitude 15.1 as of 2022 March 9.45 UT, from
observations by AAVSO member John Pickett. Observations, in a variety of
filters - visual observations included of course - are requested to see what
happens next. Deep minima of this object have tended to occur at
semi-regular intervals of about 400 days but the last comparable minimum
drawn from the AAVSO light curve was only about 100 days ago, so this may
indicate new processes are taking place in the circumstellar environment."

"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 VSP.
Submit observations: Please submit observations to the AAVSO International
Database using the name V1117 HER and also to Chris Jones (TA).

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen using material
provided by Michael Poxon.
Guy M Hurst

