Affiliation
American Association of Variable Star Observers (AAVSO)
Wed, 02/20/2019 - 17:18

AAVSO Alert Notice 662 announces an observing campaign on the X-ray binary V818 Sco (Sco X-1) underway now. Please see the Alert Notice for details and observing instructions.

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ