Observed Spectral profile of NGC7662


Date & Time: Nov 14 2020, from 19:21 to 19:22 JST(+0900)
Composed 2 shots with 30 seconds exposed
Optical: Meade 25cm(10") Schmidt Cassegrain (f=2500mm, F10.0)
with SBIG DSS7 Spectrometer
Auto-guided with Meade LX200 Equatorial
Cooled CCD Camera: SBIG ST-402ME (Temp.: -20°C)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Upper strip: taken spectrogram, Lower strip: stretched 3-pixel-width & pseudo-colored image


This page shows a spectrogram of the NGC7662 (Blue Snowball) and an intensity profile provided from it. The profile shows four emission lines from the Balmer series, from Hα to Hδ, of hydrogen atoms. And you can recognize that the nebula includes extraordinary strong two emission lines from the ionized oxygen atoms of O III relative to those from the Balmer series. The normal optical images of the nebula show greenish color, which is consistent with the spectrogram that hardly includes Hα composition in red light.


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