spectroscopic observations on 9 febr. 2021

After a full month of not being able to observe due to the persistent bad weather, I was finally able to open the observatory again, although in cold temperatures of -7° C. I was able to obtain some spectra with the LHiResIII spectrograph and took some stars for the TESS project (see ARAS forum). Stars I was able to capture a spectrum are: gam Cas (H-alpha region), gam Cas (HeI @ 6678 Å), 25 Ori, 15 Mon, HD 43285, ome Ori, OT Gem.

New comet C/2021 A7 (NEOWISE)

In collaboration with F.-J. Hambsch we observed an object while it was still mentioned on the PCCP of the minorplanetcenter on 13 jan. 2021. We could detect this comet on the images taken with the 0.4-m f/6.8 ODK of F.-J. Hambsch his privat observatory (ROAD) in Chile (MPC:G39). Later on 15 jan. this cobject was assigned as comet C/2021 A7 (NEOWISE) via CBET 4917 and M.P.E.C. 2021-A211 : COMET C/2021 A7 (NEOWISE).

technical issue with ASA DDM85 on 21 dec. 2020

I noticed an problem with my setup with the ASA DDM85 mount. The USB devices aren’t recognised anymore . After some tests, i could conclude that the internal USB hub of the ASA DDM85 isn’t working anymore or very unstable. I decided to remove my telescope and the mount an thanks of the tips of a Dutch friend, i could remove the internal USB-hub. I opened the very small USB hub and saw that the electronics was severely contaminated by combination of condensate and dirt. check out the webpage of the ASA mount with USB internal hub. I did a search on internet but this kind of USB-hub (Conrad 4 port USB 2.0 hub type: HY-HB-856, manufacturer is the Chinese Hiyatek) is obsolete. I contacted Astrosysteme and they are closed until 11 jan. 2021.

update (26 dec.2020): The USB hub is no longer working anyway. So I cleaned the USB hub with distilled water and toothbrush. Afterwards I dried it and put it in a bath of isopropanol for a few minutes, then dried it with a hairdryer. Tested again and the USB hub works again. But after a while testing with the CCD-camera, i experienced that the hub is unstable and not working always.

comet and spectroscopic observation on 8 dec.2020

the observation conditions were not very good, but I did start observing some comets + possible new comet reported on the PCCP of the minorplanet centre. comets that have been observed: 29P, C/2020 T4 , new object A10t3ha could be detected and report sent to CBAT and MPC. Later on Dec. 9, this object was assigned as comet P/2020 X1 (ATLAS). High resolution spectra were also taken from the following Be stars: pi Aqr, 28 Cyg, gam Cas (HeI-detail @ 6678Å), 48 Per, V378 And.

Vivaldi