Possible Nova Scorpii 1958
Taken by Filipp Romanov on February 22, 2017 @
Moscow, Russian Federation
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Hello! I am Filipp Romanov - 19-year-old amateur astronomer. I am from Moscow, Russian Federation.
During 2016 I discovered 30 variable stars by analyzing NSVS archive. Information on them can be found in my LJ http://filipp-romanov.livejournal.com/27664.html This year, I decided to search for variable stars in another way - by Digitized Sky Survey photographs. As you know, they are available at link https://archive.stsci.edu/cgi-bin/dss_plate_finder As a result of searches in the area of the sky with the coordinates of 17 57 59.88 -31 38 08.4 on two photographs taken in 1958, there was a bright object that was not in the photographs other years. MPChecker not showed asteroids in the place. Variable stars are not found there. As a result, this variable has been registered on 22 February into the AAVSO VSX under the name Romanov V1 https://www.aavso.org/vsx/index.php?view=detail.top&oid=477039 It was determined that flared star OGLE bul_sc23_i_396037 brightness 21,3 V. In these photos taken on the same date April 18, 1958, in blue plate (POSS-I O) variable does not look so bright as in red plate (POSS-E Red Plate). Approximate brightness at maximum I identified 13,5 V, but judging by the second photo, it will be about 11 mag in the filter R. Preliminary variable type UG (dwarf nova), but there is an indirect fact that the star was not photographed at maximum brightness. This, again, red colour. The attached composite image it is readily visible. Dwarf nova this brightness should not be so red, it means that it can be missed nova.
If in the future star again breaks out, it will be possible to know exactly the type of its variability. For now there are only two pictures of 1958 already that the object looks interesting.
So, is still possible to discover the missed nova at the old photos.
Sincerely, Filipp Romanov.
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