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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

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

Telescopic comet NEOWISE

18.3.2021 at 21.31 - 23.45 - Helsinki, Maunula (I)
Jorma Ryske, Etelä-Suomen kosmol. seura

Comet C/2021 A2 (NEOWISE) is now much dimmer than I last observed it at February 16th. In this 115min exposure using 387nm narrowband filter cyanogen CN 3883Å radical gas coma diameter is 0,6'/40.000km and wide fan-shaped cyanogen gas tail length 1'/60.000km towards PA 330° is visible. Comet current distance from sun is 1,62au and from earth 1,43au. I took also R channel photometric image and although the image had poor S/N I measured comet R channel brightness as 16,3mag. CN channel brightness measurement is difficult because lack of 3883Å reference stars, not very scientific but when using B...

Binocular comet

25.7.2020 at 00.30 - 02.00 - Järvenpää (II)
Eemil Pietilä, Ursa (Etelä-Suomi)

Thus, on cloudy days, I went through old footage of the comet NEOWISE. When I started star shooting last summer, I wasn’t yet a very skilled image editor, but now, almost a year later, I ended up editing the images again. And strangely enough, with higher quality applications and better skills, I also brought out the tail of a piece of a comet. So I put on top of 30 images with a 20 second exposure. And I edited e.g. white balance, exposure, and contrast with Adobe Camera RAW. Finally, I still improved the colors in Lightroom.

Telescopic comet NEOWISE

16.2.2021 at 22.15 - 23.55 - Helsinki, Maunula (II)
Jorma Ryske, Etelä-Suomen kosmol. seura

Comet C/2021 A2 (NEOWISE) cyanogen CN radical gas coma diameter 1,7'/50000km and wide fan-shaped cyanogen gas tail length 3,4'/100000km towards PA 10° is visible in this 3870Å narrowband filter image. Comet distance from sun is 1,46au so the sun heat and UV radiation is strong enough to sublimate comet icy surface and photodissociate gases like CN at 3883Å.    Image 1) 30x180s=90min with CN 387nm narrowband filter at 2021-02-16 20:15-21:50UT Image 2) Processed cropped image 1 with CometCIEF to enhance coma and tail morphology. No significant details visible.

Images: 2 pcs

Telescopic comet NEOWISE

17.2.2021 at 19.33 - 20.11 - Imatra (I)
Rauno Paivinen, Etelä-Karjalan nova

The comet Neowise as described again, the small tail there again appears. The rising moon was already beginning to illuminate the sky in addition to light pollution. This time the frost of more than 20 degrees was already too much for the equipment and when the color picture frames were taken, the camera started to make those stripes in the upper corner.

Images: 4 pcs

Telescopic comet NEOWISE

16.2.2021 at 19.49 - 20.05 - Hankasalmi, Murtoinen (II)
Harri Kiiskinen, Jyväskylän Sirius

C / 2021 A2 (NEOWISE), found in January, moves very fast, making it difficult to determine brightness. There is a lot to break down in the brightness measurements, as can be seen from the image taken from the attached COBS.si database. Personally, I measured this on 8.2.2021 to a brightness of 11.0.

Images: 4 pcs

Telescopic comet NEOWISE

16.2.2021 at 20.30 - Tampere (II)
Tapio Lahtinen, Tampereen Ursa

A new company with a shorter focal length.

Telescopic comet NEOWISE

15.2.2021 at 22.36 - 22.55 - Tampere (II)
Tapio Lahtinen, Tampereen Ursa

After the shooting experiment, there was too much focal length available and an ‘inappropriate’ camera to shoot the comet but I decided to give it a try anyway. When the comet was quite close, the motion became quite clear already in the 1.5 minute exposure.

Telescopic comet NEOWISE

14.2.2021 at 20.51 - 21.27 - Imatra (I)
Rauno Paivinen, Etelä-Karjalan nova

The dim comet C / 2021 A2 (NEOWISE) moves in the direction of Orion above Betelgeuse and is noticeable at least to telescope photographers. I tried to photograph this as early as a couple of evenings, both times the clouds arrived before I had time to get the exposures. On the third attempt, the clouds finally agreed to stay away for the duration of the shoot and I was able to grab 60s of 30s exposures. The comet has a short tail, about 1.5-2 arc minutes long. I estimate my own brightness at about 14.5-15 mag using Simbad's map In a single image, the image area is about 17x21 arc minutes, ...

Images: 4 pcs • Comments: 1 pcs

Binocular comet NEOWISE

22.7.2020 at 01.10 - 01.15 - Helsinki, Viikinranta (III)
Veikko Mäkelä, Ursa (Helsinki)

Ninth NEOWISE observation. Now, for the first time, I had missed a couple of nights because of the clouds. The conditions were decent, and the sky is gradually starting to darken as well. On the night of 18/19 July, the comet has dimmed to just over half its magnitude. Despite the good conditions, the tail stood out no more than half a degree. 1.15 p.m. C / 2020 F3 (NEOWISE) mag: 3.9: (ref. Ioota UMa), method: Morris comma: 3 ' Degree of condensation of the coma: DC = 7 (0-9, 9 is star-shaped) tail: 30 'PA 30 °

Binocular comet NEOWISE

19.7.2020 at 01.15 - 01.25 - Helsinki, Viikinranta (III)
Veikko Mäkelä, Ursa (Helsinki)

Eighth NEOWISE observation in the tube. The comet has already moved alongside the "forepaws" of the Big Bear, Talitha (Iota) and Alkaprah (Kappa). There was some cloud of fog, with a somewhat uncertain estimate of brightness. The comet is now clearly dimmed, the comma slightly more diffuse (DC = 7). The tail stood out less than a degree due to the conditions. at 1.20 C / 2020 F3 (NEOWISE) mag: 3.2: (ref. Iota Aur, Kappa Aur), method: Morris comma: 3 ' Degree of condensation of the coma: DC = 7 (0-9, 9 is star-shaped) tail: 50 'PA 15 °

Telescopic comet NEOWISE

4.2.2021 at 21.28 - 21.35 - Hankasalmi, Murtoinen (II)
Harri Kiiskinen, Jyväskylän Sirius

The weather has certainly not favored the last couple of months and previous comet observations are almost two months behind. 4.2.2021 the sky finally opened and the small technical problems of the Hankasalmi Observatory have been resolved and the system is again ready for observation. Comet C / 2021 A2 (NEOWISE) was discovered a month ago on January 3, 2021. Periheli was on January 22, 2021 and the closest comet to the country was on February 3, 2021. I measured the brightness to 11.0 mag. Light curve from the COBS database

Images: 2 pcs

Telescopic comet NEOWISE

5.2.2021 at 05.31 - 05.55 - Chile (I)
Kari A. Kuure, Tampereen Ursa

A comet discovered in early January that begins to be in brightness class 11. Here’s a quick series of pictures of the comet’s progress. Photographs taken with the SLOOH Observatory remote control Chile 2 telescope (432/2938 mm f / 6.8)

Binocular comet NEOWISE

18.7.2020 at 01.00 - 01.30 - Helsinki, Viikinranta (III)
Veikko Mäkelä, Ursa (Helsinki)

In turn, night clouds as a disadvantage of comet observation. The brightness of the comet has fallen slightly. Now Ioota UMa is no longer the reference star. Due to the circumstances, only 45 'of the tail was visible. Attached is a computer-aided drawing. At 1.10 C / 2020 F3 (NEOWISE) mag: 2.8: (ref. Iota UMa), method: Morris comma: 3 ': Degree of condensation of the coma: DC = 8 (0-9, 9 is star-shaped) tail: 45 'PA 5 °

Comet with naked eye coma NEOWISE

17.7.2020 at 01.10 - 01.20 - Helsinki, Viikinranta-Pornaistenniemi (III)
Veikko Mäkelä, Ursa (Helsinki)

Sixth NEOWISE observation in the tube. The conditions were valid this time when the night clouds were not in the comet area. The comet might still be visible to the naked eye, even though its brightness seems to have faded by a few tithes. Along with Beta and Epsilon, I had to take Iota the Big Bear for references. The comet had already moved so far west of Ajomies. Due to the conditions, the binoculars showed the tail as much as 1.5 degrees. The coma is still dense (DC = 8). Attached is a computer-aided drawing. C / 2020 F3 (NEOWISE) mag: 2.7 (ref. Beta Aur, Epsilon Aur, Iota UMa), method: Mo...

Binocular comet NEOWISE

16.7.2020 at 01.05 - 01.10 - Helsinki, Viikinranta (III)
Veikko Mäkelä, Ursa (Helsinki)

The fifth NEOWISE observation was, in turn, badly disturbed by night clouds. Although normal clouds interfered with night cloud observations, there was nothing but a thin upper cloud at the comet. Due to the circumstances, I was not able to use the out-of-focus method, but was content with a direct comparison to Menkalinan and Epsilon Aurigae. The brightness still seems to have spoken about the same. The appearance of the tail was limited to half a degree. There was no hope of seeing with the naked eye. Attached is a computer-generated drawing observation. C / 2020 F3 (NEOWISE) mag: 2.4: (ref....

Comet with naked eye coma NEOWISE

15.7.2020 at 01.00 - 01.45 - Helsinki, Viikinranta (III)
Veikko Mäkelä, Ursa (Helsinki)

This time a clear night without night clouds. The comet was well visible with binoculars and also stood out with the naked eye when looked closely. The clear, albeit dim sky, improved the view of the subject. The tail stood out by a degree. The tail begins to be almost upright towards the celestial pole. Attached is a computer drawing and one piece cropped from an image taken with a 700 mm lens. C / 2020 F3 (NEOWISE) mag: 2.5 (ref. Beta Aur, Epsilon Aur), method: Bobrovnikov comma: 3 ' Degree of condensation of the coma: DC = 8 (0-9, 9 is star-shaped) tail: 60 'PA 355 °

Images: 2 pcs

Comet with naked eye coma NEOWISE

14.7.2020 at 01.20 - 02.05 - Helsinki, Viikinranta (III)
Veikko Mäkelä, Ursa (Helsinki)

Tonight there was less inconvenience from the night clouds. There was at most weak night cloud gauze in the comet area. The comet probably stood out again with the naked eye. The tail was already separated by a degree with a binoculars. I further compared the brightness to Menkalinan (Beta Aur) and Epsilon Aurigae. The magnitude has come down a couple of tenths again, but is still 2.7 with little uncertainty. Attached is a computer-generated drawing and a couple of cropped images from images taken with a 70 mm lens. Surprisingly, the comet stands out from there. C / 2020 F3 (NEOWISE) mag: 2.7:...

Images: 3 pcs

Binocular comet NEOWISE

13.7.2020 at 01.00 - 01.50 - Helsinki, Pornaistenniemi-Viikinranta (III)
Veikko Mäkelä, Ursa (Helsinki)

Tonight, the comet's sight was hampered by night clouds, and the comet could not even be imagined to see with the naked eye. However, with binoculars, the target was found quite easily. The tail was visible at about half a degree. The brightness observations had to be content with a direct comparison. With a little uncertainty, the brightness was 2.5 mag, which is slightly dimmer than the night before. Attached is a computer-generated binocular observation drawing. I also tried to shoot with the camera and this comet grabbed the boxes. Attached are cropped images of those shot with a 70mm ...

Images: 3 pcs

Telescopic comet NEOWISE

21.7.2020 at 01.43 - 01.58 - Kouvola (II)
Tero Sipinen, Ursa (Etelä-Suomi)

Once again hunting NEOWISE. Many, many times, I had sketched using Google Maps and a ruler to get the comet in the same portrait as the ornament on the roof of the church next door. After all, the comet was not even found, and if it was found, then it was in such a direction or at such a height that the common portrait did not succeed. This time I managed to find the comet images pretty close to the ornament. With a few meters of camera shift, I got it so badly that I could extend the focal length to 600 miles. The transfer had to be done in small batches, being careful not to lose the low-vis...

Comments: 2 pcs

Binocular comet NEOWISE, C/2017 T2

12.8.2020 at 23.50 - Fregenal de la Sierra, Espanja (III)
Tapio Lahtinen, Tampereen Ursa

I took advantage of the situation with the Spanish tube when the two comets were only about 2 degrees apart. However, they did not fit in one image, so I had to resort to a mosaic of two images. Neowise still looks pretty handsome, so maybe you should still try it in Finland, even if it's low. The brightness of the Panstarrs comet is about mag 10.5.

Images: 3 pcs

Search result contains observations from time period 23.6.2020 klo 08.24 - 29.11.2021 klo 07.55.