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| Pixel scale = 4.97 arcsec, rotation = -73.87 deg. The session was interrupted by clouds. |
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| Pixel scale = 4.97 arcsec, rotation = -73.87 deg. The session was interrupted by clouds. |
Photometry only for this session. The images were split into R, G, and B channels after full calibration performed. Photometric measurements were completed with the G channel images by APER.pro:
ZP = 21.6611+-0.0560529
aper mag emag
2.5 15.499+-0.141
5.0 14.222+-0.095
7.5 13.559+-0.083
10.0 13.101+-0.077
12.5 12.818+-0.075
15.0 12.642+-0.075
17.5 12.506+-0.076
20.0 12.371+-0.076
22.5 12.225+-0.076
25.0 12.140+-0.077
27.5 12.078+-0.079
30.0 12.082+-0.083 aper (aperture) in pix.
14 comparison stars with color indexes similar to Sun's situated around the comet were taken from catalog APASS. The V band mags were exploited to solve the zero-point of the image. The plot of multiaperture photometry, with $m_\infty$ solved:
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$m_\infty $ of the comet should have been even brighter due to the insufficient SNR thereby only a portion of the coma recorded.
Copyright © Man-To Hui 2013/12/26
Feel free to e-mail me with any doubts or questions.