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AAVSO Alert Notice

Alert Notice 691: Request for immediate photometric monitoring of the fading star ASASSN-V J060000.76-310027.83

Note: As of 2020 January 31 the eclipse is still ongoing. Please continue observations as described below until further notice.  -  Elizabeth O. Waagen

January 8, 2020

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Campaigns and Observation Reports:
https://www.aavso.org/asassnv-j06000076-31002783-campaign-2020

Alert Notice 689: R Aqr monitoring needed in support of HST and Chandra observations

Note:  Continued observations in all bands (particularly B and V) and spectroscopy are extremely important. Please continue nightly observations until further notice.  -  Elizabeth O. Waagen, 31 January 2020

Note: The exact schedules for the Chandra and HST observations of R Aqr (Alert Notice 689) are as follow:

Chandra (UT)  Note that this date is EARLIER than given in Alert Notice 689.
12 Jan 2020 00:13:21.409 - 12 Jan 2020 14:06:41

Alert Notice 686: B-band photometry of TYC 2597-735-1 urgently needed

November 19, 2019

AAVSO Forum thread (scroll to the bottom of a thread for latest posts):
- Campaigns and Observation Reports:
https://www.aavso.org/tyc-2597-735-1-campaign-2019

Dr. Keri Hoadley (California Institute of Technology) requests AAVSO observers' assistance in obtaining B-band images of the star TYC 2597-735-1 over the next few weeks. This campaign needs to be accomplished before the target becomes unobservable in the West.

AAVSO Alert Notice 685: EM Cyg monitoring requested

NOTES: Dr. Ruiz-Carmona communicated that this campaign is concluded as of December 19, 2019. - Elizabeth O. Waagen, December 19, 2019

Dr. Ruiz-Carmona communicates that they would like to observe EM Cyg after another outburst to obtain further data. Please continue to monitor EM Cyg as instructed below until further notice. - Elizabeth O. Waagen, December 2, 2019

November 8, 2019

Alert Notice 684: Photometry requested for campaign on V1491 Cyg

November 1, 2019

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
 - Campaigns and Observing Reports: https://www.aavso.org/v1491-cyg-campaign-2019
 - Young Stellar Objects: https://www.aavso.org/v1491-cyg-campaign-2019-01
 

Dr. Dirk Froebrich (University of Kent) has requested AAVSO observations to support their upcoming observations of V1491 Cyg. He writes:

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