[O-05] Poster presentations by senior high school students

[O05-P56] Spectroscopic observation of a meteor using a diffraction grating

*Atsuya Sugawara¹, Soya Ito¹, Tomoki Misao¹, Syotaro Mino² (1.Miyagi Prefecture Furukawa Reimei Sinior High School, 2.Miyagi Prefecture Furukawa Reimei Junior High School)

Keywords:Meteor, Brightline spectrum, Diffraction grating

Since we were interested in the emission of meteors by looking at the image where the color of the meteor changed at the light emission starting point and the light emission end point, we studied what kind of element the meteor is emitting from the spectroscopic observation . For the research, we used a blazed diffraction grating with 300 lines / mm and a transmission type diffraction grating film with 1000 lines / mm on a digital single lens reflex camera. In the research method, firstly, the spectral photograph of the meteor is photographed using the above apparatus. Next, a spectral tube is brought close to the situation of taking meteor images, and spectroscopic photography is performed for calibration to check the scale of the diffraction grating. Then use the image analysis software and measure the distance (number of pixels) from the meteoroid main body to the bright line spectrum representing the element from which the meteoroid's light originates on the picture. Then, in this observation that estimates the element from which the meteoroid luminescence is derived by comparing this spectral photograph with the image of the calibration work, the Perseidian meteor shower is observed by using six cameras from four places in Miyagi prefecture with a personal computer and a remote shutter connected and taking shots continuously with exposure of 5 seconds and 10 seconds. And we were able to take a spectrogram of one that seems to be one of Perseid meteor shower groups. For the calibration work, it was performed assuming that the bright line spectrum (wavelength 589 nm) of the image was sodium, and the spectrum was further estimated. As a result of analyzing by the above method, wavelengths which are seen at 521 nm and 630 nm were specified.This suggests that meteors may emit light with elements such as Magnesium (518 nm) and Silicon (634 nm). Lastly, we would like to express our sincere gratitude to Dr. Mr. Masayuki Yamamoto, Kochi University of Technology for cooperating with doing this research, Thank you very much for Mr. Yuhei Suzuki of Faculty of Science, Ibaraki University.