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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

9 observations and 1 comments in queue.

Only observations that have a description and at least one image attached.

Abell 85 / CTB1

19.10.2021 at 19.15 - 20.30 - Kangaslampi (I)
Erik Pirtala, Warkauden Kassiopeia

Lokakuu on ollut varsin surkea havaintokelien osalta. Kuun ihan ensimmäisinä päivinä aloitettu projekti tuli maaliin viime yönä, kun Itä-Suomeenkiin saatiin parin tunnin kirkas pätkä. Kuvasin tämän kohteen 17,2 -tuntisena projektina . Sumu on kapeakaistassa HOO -paletissa, ja tähän on löyty RGB -tähdet päälle. Todella himmeä ja haastava kohde. Tässä meni aikansa että löysi edes sinne päin toimivan määrän ja maskauksen kohinanpoistolle. Herkästi näissä himmeissä siloittelee liikaa ja tekee lopputuloksesta liian muovisen. H-alfa: 9hO-III: 7,2hRGB:20min per kanava = 1h Suurempi kuva ja tekniset t...

Comments: 1 pcs

Abell 85

14.2.2020 at 19.30 - 22.45 - Oulu (II)
Jukka-Pekka Metsavainio

CTB1, Abell 85, is a opaque supernova remnant in the constellation of Cassiopeia at a distance of about 9800 light-years. I now photographed the subject's camera lens Tokina AT-x 300mm f2.8. I have previously photographed a subject with a much longer focal length. It’s nice to see the object in a broader context now, I also made a two-panel mosaic of it with the Cosmic Question Mark I photographed recently, Cederblad 214. More information and much bigger pictures on my blog, Pictures, 1. CTB1 in an image fi...

Images: 3 pcs

Abell 85

30.3.2017 at 05.00 - Helsinki (I)
Jyrki Haajanen, Ursa (Helsinki)

The Abell 85 is a supernova remnant and really challenging to shoot. Probably the dullest target this season ... and a couple of previous seasons. The challenge of image processing is compounded by the very large number of stars that, however, fit (at least in my opinion) well into this subject. Usually, I subtract the number of stars from the final image much more to make the object itself more visible. This time they had to be left quite abundant. Exposure in the pile for 16 h and another Mokoma would still have fit well ... Learn more at Flickr

Comments: 6 pcs

Abell 85

4.1.2016 at 23.30 - Oulu (V)
Jukka-Pekka Metsavainio

I started the photography project in January 2015 and completed it on January 4, 2016. It is a dim supernova remnant in the constellation of Cassiopia at 9800 light-years from us and about 98 light-years in diameter. The residue is about the size of a full moon in apparent diameter and very opaque in surface brightness. The exposure time for the image is 12 hours Comparing the exposures of 2015 and 2016, I noticed that one star brightened considerably. I checked its data from the SIMBAD database and it turned out to be a supposed alternating star, NSV 26187. I also made a small GIF animation o...

Images: 3 pcs • Comments: 4 pcs

Abell 85

9.2.2015 at 20.00 - Oulu (II)
Jukka-Pekka Metsavainio

The dim supernova remnant of Cassiopeia Abell 85 (CTB1) has been described on three different nights and practically between clouds. This is a difficult subject due to the low surface brightness. I described two emission channels, hydrogen and oxygen (H-alpha and O-III) and did the so-called two color image. There is ionized oxygen in the subject with little emphasis on the left side of the mist in the images, the oxygen appears bluish. The object ended up on Abell's list of planetary nebulae but was confirmed as a supernova remnant in 1971 (Willis & Dickel) There are far too few exposures...

Images: 3 pcs • Comments: 1 pcs

Search result contains observations from time period 20.9.2010 klo 13.51 - 07.12.2021 klo 14.54.