Alert Notice 785: Monitoring of V452 Vul = HD 189733 requested

July 5, 2022

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Campaigns and Observing Reports: https://www.aavso.org/v452-vul-exoplanet-host-monitoring-campaign-2022-01

- Exoplanets: https://www.aavso.org/v452-vul-exoplanet-host-monitoring-campaign-2022

Please subscribe to 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!

Dr. Rob Zellem (NASA Jet Propulsion Laboratory) requests the assistance of AAVSO observers in monitoring the exoplanet host star V452 Vul (= HD 189733, exoplanet HD 189733b) in support of a HST/WFC3 observing campaign currently underway.

Dr. Zellem writes: "This campaign will be to monitor for stellar variability on HD 189733, the host star of a hot Jupiter exoplanet. These observations will crucially support an ongoing Hubble/WFC3 campaign to perform 2D spectroscopic mapping of this canonical exoplanet. The AAVSO observations will allow us to determine if variability is impacting the measured signal by Hubble or place constraints on any measured planetary variability. We hope that this AAVSO observing campaign will help shine additional light on the awesome work being done by AAVSO for the professional exoplanet community and hopefully result in additional observing run requests.

"Stellar monitoring should begin as soon as possible and continue through the end of August 2022. That will give us sufficient baseline for our Hubble/WFC3 observations."

All types of observations - CCD, DSLR, PEP, visual - are welcome. All filters and cadences are welcome. As Dr. Zellem states: "We are happy to take any variable star measurements that we can get! But the Hubble/WFC3 observations will be taking place in the near-IR (~1.1-1.7 um), so ideally filters closer to this wavelength range would be great. However, as stated above, we are happy to take all the data we can get, regardless of the filter and/or camera."

Observers interested in spectroscopy should contact Dr. Zellem (rzellem@jpl.nasa.gov).

Coordinates (2000.0): R.A. 20 00 43.71 Dec. +22 42 39.0  (from VSX page for V452 Vul)  
Range: 7.67 (0.03) V

Charts with comparison stars for V452 Vul may be created using the AAVSO Variable Star Plotter (VSP).

Please submit stellar variability observations using the name V452 Vul to the AAVSO International Database. Any transit observations should be acquired, processed, and reduced appropriately and submitted to the AAVSO Exoplanet Database.

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen using material provided by Dr. Zellem.

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SUBMIT OBSERVATIONS TO THE AAVSO

Information on submitting observations to the AAVSO may be found at:
 - Photometry/visual observations: https://www.aavso.org/webobs
 - Spectroscopy: https://www.aavso.org/apps/avspec/

 - Exoplanet transit observations: https://app.aavso.org/exosite/submit

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