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Special Notice #70: Brightening of the symbiotic star AG Draconis

October 3, 2007: It was reported in CBET 1091 by U. Munari et al. that the symbiotic star AG Draconis is again in outburst following the decline from its April 2006 bright outburst. They note that the decline apparently halted on 2007 July 07, and has since brightened steadily. Their observations place AG Dra at V = 8.98 on 2007 September 30.8 UT (B = 9.69 and B-V = +0.71). They also note the presence of strong hydrogen and helium emission lines.

AAVSO observers have been tracking AG Draconis continuously, and have clearly shown this second outburst following on the heels of the bright eruption of 2006. The most recent observation (observer BRJ, John Bortle) placed AG Dra at m(vis) = 9.4 at JD 2454376.5. Observers are asked to closely monitor AG Draconis while this interesting second outburst continues. Both visual observations and filtered instrumental photometry are requested.

AG Dra is located at RA: 16 01 41.00 Dec: +66 48 10.0 (J2000)

Previously published charts for AG Dra are available at

Custom-made charts may also be generated via VSX here:

Please report observations to the AAVSO as AG DRA (AAVSO 1601+67)

This AAVSO Special Notice was prepared by Dr. Matthew Templeton.



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