FH Serpentis

[5] It was discovered on February 13, 1970 by Minoru Honda located at Kurashiki, Japan.

[6][7] Other astronomers later studied this nova, and calculated its distances based on the decay time of its light curves.

[7] Nova Serpentis was also observed by the NASA space observatory OAO-2 Stargazer, active from 1968 to 1973.

[8] The nova was important for science because it was one of the first to be observed in multiple wavelength bands including, infrared, visible, ultra-violet, and radio.

Santamaria et al. examined images of the nebula taken in 1996 and 2018 and found that the shell is clearly expanding.

The light curve of FH Serpentis, plotted from AAVSO data. The local minimum in brightness around the end of May 1970 is a "dust dip", which occurs when dust forms as the expelled material expands and cools. [ 4 ]
Two images of the shell surrounding FH Serpentis taken 22 years apart, showing the nebula's expansion. Both were taken with Hα filters , left at the New Technology Telescope , and right with the Nordic Optical Telescope . [ 9 ]