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Alert Notice 692: V694 Mon (MWC 560) to be observed with Chandra

Note: Note: Observations of V694 Mon are scheduled for 11 March 2020 with HST, and for 22 March 2020 with XMM. Please continue to observe as indicated in Alert Notice 695 but with the high-intensity coverage taking place March 9 through March 14 and March 19 through March 25.  -  Elizabeth O. Waagen, 6 March 2020

Solar Bulletin - Volume 75, Number 12

The December Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

 

The December SID Data report is available here: https://www.aavso.org/sid-database

 

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

Note: As of 2020 March 2, Dr. Kenworthy asks that the campaign continue. He writes that "...the ring eclipse seems to have finished, but the star's overall brightness is slowly dropping. I don't think the story is over...the star is now 0.3 magnitudes fainter than its out of eclipse levels - still something interesting going on!" Please continue observations as described below until further notice.  -  Elizabeth O. Waagen, 2 March 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

JAAVSO volume 47, number 2, December 2019, print version now available

eJAAVSO

The Journal of the American Association of Variable Star Observers
Volume 47, Number 2, 2019

The printed version of this issue is now available from Amazon via the link below.

Volume 47, Number 2; 2019

JD Calendar for 2020

The 2020 Julian Day Calendar is now available for download.

HAPPY NEW YEAR!

 

Solar Bulletin - Volume 75, Number 11

The November Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

The November SID Data report is available here: https://www.aavso.org/sid-database

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