A clear night but with disturbing moonlight (about 3/4 moon) and some high clouds in the sky. several comets are observed and comet 129P as well. By Mike Kelley (University of Maryland) was mentioned on the comets-ml, that 129P experienced an outburst, so put this comet on my list : 21P, 29P, 78P, 129P, C/2014 OE4, C/2017 K4, C/2017 M4, C/2017 M5, C/2017 S3 , C/2018 C2 and P2018 L4 not detected. And with BRIXIIS-II observatory a spectrum of V2144 Cyg and gam Cas were observed.
comet observations and spectroscopic observations of Be-stars during night 21/22 july
Although veil clouds were present and aircraft traces which disturb the clear sky, I did observe a number of comets and recorded with the 2nd telescope spectra of Be-stars. With the selection of the images, reasonably useful data can still be extracted. The observed comets were: 21P, 29P, 78P, 37P, 137P, C/2012 K2, C/2012 K4, C/2017 M4, C/2017 M5 and C/2017 S3. The Be-stars , observed with BRIXIIS-II observatory are: cx Draconis and pi Aquarius.
comet observations + comet spectrum during night 18/19 july
During this clear night is started with comet observations on BRIXIIS-I observatory with the 0.4-m f/3.8 AG 16 telescope: comets that are observed are: 21P, 37P, 29P, C/2017 M4, C/2018 C2, C/2017 S3 and P/2018 L4. Also simultane i started with spectra observation on BRIXIIS-II observatory with C11 + L200 spectrograph on comet 21P and comet C/2017 S3. First i saw taht it could not easy to observe 21P with the spectrograph. Comet 21P was barely visible in the guiding camera, but i started anyway with 4x 1200 sec exposures and see what i can do with this images of the spectrograph. After these observation, comet C/2017 S3 was just above the tree that block my view and i started with 2×1200 sec. This comet was better to observe (magnitude +1 in comparison with 21P). spectrum and how processing is done, can you see on page: spectrum comet C/2017 S3
comet observations and comet spectrum during night 17/18 july
Some comets are observed especially C/2017 S3 (PANSTARRS) and 21P/GZ, also some other comets are observed during this night with sometimes clouds that coming in and must stopped the observations for some time. comets that could be observed are: 21P/GZ, 29PSW-1, 37/FORBES, C/2017 M4, C/2017 S3, C2018 C2. also i tried to make a spectrum of comet C/2017 S3 with a C11 + L200 spectrograph with 150 l/mm grating. This was my fiorst attempt to make a spectrum of such a faint and fuzzy object (core magnitude about 12.3). I added my FR 0.63 for catching more light. It was difficult to find this comet in the guidingcamera of the spectroscope, because very faint and very low in altitude, also i must wait until the comet was above the tree between the comet and my observatory. I started with 1200 sec. exposuretime for each image. I took 3 images (total exposure=1 hour). I could see some good signal but not the best. After processing is saw some weird behaviour and not exactly very sharp spectrum. I think the FR isn’t a good idea end best should be removed. It is not a good ideae to get ‘glass’ in the lightpath for spectroscopy…
comet observations during night 16/17 july 2018
comet- and spectroscopic (Be-stars) observations during night 26/27 june 2018
During the clear night but with almost full moon, several observations are made of comets: 21P, 37P, C/2015 O1, C/2017 K2, C/2017 M4, C/2017 S3, C/2018 C2. Also with second setup: C11 + L200 spectrograph with 1800 l/mm grating are following Be-stars observed: HD195907 and V568Cyg .
comet and spectroscopic observations (Be-stars) during night of 25/26 june 2018
several comets are observed during nihgt 25/26 june: 21P, 37P, C/2015 O1, C/2017 K2, C/2017 M4, C/2017 S3, C/2018 C2 and object ZMB936E mentioned on the CP of MPC – images are astrometric and photometric measured and send to MPC. For some comets are also the Af(rho) parameter obtained from CCD-images with R-Bessel filter (CARA approach). With the second observatory (BRIXIIS-II) are some Be-stars observed + VV Cep with C11 + L200 spectrograph with 1800 l/mm grating: VV Cephei, HD206773 and z Hercules .
comet and spectroscopic (Be-stars) observations during night 21/22 june 2018
comet and spectroscopic (Be-stars) observations during night 20/21 june 2018
During a clear night of 20/21 i did observations of some comets and observations of possible comet menioned on the PCCP (magnitude 19.7): comets which are observed are: 21P, C/2015 O1, C/2016 N4, C/2017 M4, C/2018 C2. Possible comet was found in the images and astrometry send to MPC to improve the ephemerides of this possible new comet. With the C11 + L200 spectrograph, 3 Be-stars are observed: 48 Lib, cx Draconis and EW Lac.
new comet P/2018 L4 (PANSTARRS) – observation of 20 june
Comet P/2018 L4 was discovered by R.Wainscoat and found on images taken on June 8.5 UT with the 1.8-m Pan-STARRS1 Ritchey-Chretien telescope at Haleakala .
This object was also observed by myself with my 0.4-m f/3.8 AG16 telescope, while it was mentioned on the PCCP of the minor planet center on 20 june 2018. I took 20 x 120sec. Exposures and found after stacking this object as well. I have send the astrometric data and comment of the cometary appearance to the minor planetcenter on 21 june 2018. Later on 22 june 2018, this object was assigned as P/2018 L4 (PANSTARRS) with CBET 4527: 20180622 : COMET P/2018 L4 (PANSTARRS) issued on 22 june 2018
