Arne Henden, Director of the American Association of Variable Star Observers (AAVSO
Having had the good fortune to attend the first ever high energy astrophysics conference for amateurs and professionals sponsored by NASA and the AAVSO
in Hunstville, Ala., and many other astronomy and related conventions, I have had the opportunity to visit with scientists, astronauts, educators, science writers, students and planetarium directors who stress the value of their local amateur astronomy groups and the relationships they have forged in those communities.
To print a comparison-star chart with standard magnitudes for all observers to use, see aavso
To acknowledge and celebrate his contribution, the AAVSO
organized a special award in the form of a plaque which was handed over to Jannie at an informal tea party at his home on 25 February 2012.
Apart from visual observations, XG also used the remote telescopes of the Bradford Robotic Telescope (2) and the AAVSO
Sonoita Research observatory (SRO) (3) to obtain data.
In the late 1970s variable stars were observed, mostly for the AAVSO
. This was followed, in the mid-1980s, with the photoelectric photometry of variable stars, which became the backbone of the observatory's work till its closure.
All such star-timing work is done now by CCD photometry, says Gerry Samolyk, who runs the Short Period Pulsator Section of the American Association of Variable Star Observers (AAVSO
International Database lists 416 observations of SDSS J081610.84+453010.2 between 2002 February and the 2010 outburst discussed in this paper, but only 28 were positive detections.
The following observations were submitted to the AAVSO
database during the 2009 observation year.
Elizabeth Waagen of the American Association of Variable Star Observers writes that of the 381 Mira variables that AAVSO
observers have tracked for decades, "73% received fewer than 100 observations last year." These "all need better coverage, particularly around minimum.
Whilst there he visited the headquarters of the American Association of Variable Star Observers (AAVSO
), which was then located at Harvard College Observatory in Cambridge.
He contributed 14 582 observations (14 578 visual and 4 PEP observations) to the AAVSO
International Database during the period 24 January 1977-11 Apr 2004.