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Special Notice #407: Blazar S5 1803+78 active

September 2, 2015:  AAVSO observer Adolfo Darriba Martinez y Oscar Ortuño (DAM, Observatorio Las Casqueras, Madrid, Spain) reports that the blazar S5 1803+78 has brightened significantly.

S5 1803+78, which is magnitude 16-17 V at minimum, is currently magnitude 14.237 V (LPAB, P. Lampens-Vancauteren (Ukkel, Belgium).

Previous outbursts are recorded in the AAVSO International Database in November 2007, February 2012, and September 2014.

Photometric and visual observations of S5 1803+78 are encouraged. Recent observations reported to the AAVSO include:

2015 Jun. 7.0274 UT, 16.195 V (LPAB, P. Lampens-Vancauteren, Ukkel, Belgium);  
21.033796, 16.172 CV +/-0.026 (DAM, A. Darriba Martinez, Madrid, Spain);   
28.057396, 16.157 CV +/-0.045 (Darriba Martinez);
Jul. 11.016123, 16.093 CV +/-0.034 (Darriba Martinez);
11.98184, 16.092 CV +/-0.033 (Darriba Martinez);
Aug. 11.953102, 15.571 CV +/-0.023 (Darriba Martinez);
18.949259, 14.646 CV +/-0.008 (Darriba Martinez);
20.957257, 14.599 CV +/-0.009 (Darriba Martinez);
22.9017, 14.652 V (Lampens);
25.935648, 14.269 CV +/-0.008 (Darriba Martinez);
26.12272, 14.271 CV +/-0.006 (Darriba Martinez);
26.934259, 14.376 CV +/-0.009 (Darriba Martinez);
27.026215, 14.401 CV +/-0.009 (Darriba Martinez);
27.9217, 14.267 CV +/-0.009 (Darriba Martinez);
28.014734, 14.232 CV +/-0.009 (Darriba Martinez);
29.9116, 14.237 V (Lampens);

Coordinates: R.A. 18 00 45.69  Dec. +78 28 04.0  (2000.0)

Finder charts with a sequence for S5 1803+78 may be created using the AAVSO Variable Star Plotter (VSP, https://www.aavso.org/vsp). Request an 'E' scale (30 arcminutes) or smaller field-of-view chart to see the sequence on the chart. The photometry table for this field may also be obtained via VSP.

Please report observations to the AAVSO International Database using the name S5 1803+78.

Many thanks to Adolfo for informing us about the activity in this blazar.

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.

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