Recently Browsing 0 members
No registered users viewing this page.
A spectrum of Comet 46P (Wirtanen) with the ALPY600.
The raw spectrum image before sky background subtraction. Note as well as the comet spectrum, the bright Na D line from local light pollution and other auroral lines from natural airglow
The coma extended beyond the length of the slit so a separate sky spectrum was recorded and subtracted
The Spectrum of the bright central region is dominated by the scattered light from the sun while the spectrum of the extended coma is mainly emission from excited molecules such as CN (The very bright line in the UV), C3, C2 (The Swan bands which give the coma its blue green colour) and NH2
By removing the emission component from the spectrum of the central region and dividing it by the spectrum of a sunlike star recorded the same evening, the reflectance spectrum of the dust can be extracted
My submission for 46P Wirtanen
Single exposure, 1 minute iso 1250
Nikon 800E full frame - edge cropped
Altair Astro 115 EDT-APO refractor on iOptron iEQ45 Pro mount.
Capture: SG Pro, guiding PHD 2 via SX Lodestar
Processing: PixInsight 1.8 and Photoshop CS3 Extended (for caption and resizing)
I just tried to see the moving of this object. I made 20 frames with my Huawei P10 smartphone, with the monochrome camera. My star tracking is not so sharp, I have alt-az mount, I used only 10 sec expositions at ISO 1600. The shots was taken in every 10-12 minutes in this time intervall: 00:16-03:53am 2018. 08.16. Celestron Nexstar 8 SE, 25mm plössl eyepiece (magnification 80x). Of course I used a good adapter too. Frames has added with Gif maker pro mobile application.