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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


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.



Solar Bulletin - Volume 75, Number 11

The November Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:

The November SID Data report is available here:

JAAVSO Volume 47 Number 2, 2019 is published


The printed version of this issue will be available soon. Please watch for the announcement on our main web page.


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