Contact information

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.

Perseids

18.8.2015 at 00.12 - Espoo & Vantaa (IV)
Janne Sievinen, Pentti Arpalahti, Ursa (Helsinki)

In the autumn of 2015, during the Perseidi swarm, we accidentally shot the same meteor with Pentti Arpalahti at a distance of about 12 kilometers from each other in Paloheinä, Vantaa, and Röylä, Espoo. Looking at the images, attention was drawn to the clearly observable parallax, which provided an opportunity to try to reconstruct the orbit of the meteor. The azimuth of the observed ignition and extinction points of the meteor and the determination of the altitude coordinates for each observation site were straightforward using star map software because the observation time and the coordinates...

Images: 2 pcs • Comments: 5 pcs

Active aurora band

19.8.2020 at 01.55 - Tampere (III)
Pentti Arpalahti, Kari A. Kuure, Emma Bruus, Tampereen Ursa

The momentary activation of the northern lights took hold of Ursa's weather cameras in Tampere.

Images: 3 pcs

A fireball in a twilight sky

3.8.2013 at 01.16 - Helsinki (IV)
Pentti Arpalahti

While waiting for the night clouds to brighten, a relatively modest like a fireball flashed in a spot below Otava as shown. The gaze was a little to the side, but the vanilla and the final brightening were more spectacular than the usual meteor streak.

Comments: 4 pcs

A fireball in a twilight sky

7.8.2013 at 01.47 - Helsinki (IV)
Pentti Arpalahti

There was no need to draw a Perseidi fireball this time when Samyangi happened to look in the right direction. Thanks to the daylight color temperature setting, the color of the ugly light pollution in the image is now what it is. Update: I processed a more comfortable-looking color temperature-corrected version of the image that matches the visual impression outside the light pollution area. There is little ground in the corner.

Images: 2 pcs • Comments: 1 pcs

A fireball in a twilight sky

5.8.2014 at 01.52 - Helsinki (IV)
Pentti Arpalahti

While photographing a few night-cloud negatives, the fireball dropped low on the horizon to the north. The entire visible flight path grabbed the cell. The air was warmly damp and the humidity worsened the seeing and dimmed the fireball.

A fireball at night, brigter than the venus

12.9.2015 at 00.22 - Helsinki (III)
Pentti Arpalahti

When I left, I switched from 14m to Samyang's 50m. From the hazy garden, I also changed the location of the northern lights to the edge of the artificial turf field. Then a little bit of luck, small particles from the Sun and a little chunk were needed to drop into the atmosphere. Edit. In the second image, I first try to bring out the dim parts of the track as well, but as a result I lost the brightness variation of the bright part, which was more visible in the original. Control Lightroom's split tone with shadows and bright parts in different colors to emphasize brightness differenc...

Images: 3 pcs • Comments: 2 pcs

Half-sky auroras

17.3.2013 at 20.04 - Helsinki (IV)
Pentti Arpalahti

Panstars' tail still had to be tried to go stacking, and when there were enough squares and I started to make a departure, a spectacle that created an astronomical charm that one would never have imagined in Hesa could see flashed in the sky. The most handsome stage lasted only five minutes. The 70-300 millimeter taken for the tail was then to paddle around the sky. The first two pictures are from the stunning main show and the panorama above Vantaa has a calm "afterglow". For a moment, the warp stretched over the zenith. The green color was predominant, but a reddish gauze was also visibl...

Images: 3 pcs

Quiet aurora arc

16.8.2013 at 00.38 - 01.30 - Helsinki (II)
Pentti Arpalahti

Seeing was moderate for Helsinki residents, and halfway from the already cool wind of the top of Malminkartano, it became an inch that it would now be good to observe whatever. The last negative night cloud report of the year came to mind, but while practicing twilight shooting, a greenish stripe hit the eye at 0:38 that dimmed in less than a minute. However, I managed to describe it. A very matte gauze barely separated up and I described the area for safety and the passage of my time. The beautiful arch brightened after one and the best moment was 1:09. A beam of 1:23 still blew in the northw...

Images: 3 pcs • Comments: 1 pcs

Active aurora band

23.8.2013 at 01.08 - 01.53 - Helsinki (III)
Pentti Arpalahti

The culmination of the night of the arts was a northern lights show. Seeing was excellent compared to the conditions in Helsinki and, encouraged by it, I dragged the double fleet to the top of Malminkartano. The effort was rewarded. Identifiable from the photo, the repo show began at 1:08 p.m. The brightest moment was 1:39 - 1:41 and with a terrible hustle and bustle I tried to flicker the overview and details. The greenish dull gauze, reminiscent of urban light pollution, still glowed 1:53 when he left. While spitting down the hill of Malminkartano, I moaned and thanked for another full month...

Images: 2 pcs

Quiet aurora arc

28.8.2013 at 00.00 - 00.40 - Helsinki (II)
Pentti Arpalahti

A burst of reports on guard prompted me to collect filming slips and run to the edge of the sports field. The calm arch stood out well despite the street lights. The dim green glow was detected above the roofs at 0:40.

Images: 2 pcs

Northern lights

2.9.2013 at 00.21 - 00.50 - Helsinki (I)
Pentti Arpalahti

After climbing on Malminkartano's peak northern direction has to be checked with camera although naked eye didn't see anything for sure. Seeing was quite good. I were able to distinguish weakly even Milky Way. Very faint auroras could be detected in pictures after patient LR manipulation, er,  I mean processing. Picture was taken at 0:26.

Comments: 1 pcs

Diffuse glow

7.9.2013 at 00.54 - 01.30 - Helsinki (I)
Pentti Arpalahti

After all, those reposet are in Helsinki. The sky was otherwise cloudless, but the moisture blurred the seeing. The eyes thus noticed such a very dim glow when, on the basis of experience, they were able to identify a uniform area above the local light pollution areas. The glow was steady throughout the observation period without any bursts.

Images: 2 pcs

Auroras seen through breaks in the clouds

3.10.2013 at 02.07 - 02.30 - Helsinki (II)
Pentti Arpalahti

At first, the sky seemed to be completely covered in clouds, but with good luck, something could be glimpsed from the cloud gap, when the oval nonetheless extended all the way to the south coast. Like on order, a thick layer of clouds opened in the north after two and a little green light particles accumulated on the cell. Around half past three, the curtain closed.

Images: 3 pcs

Active aurora band

14.10.2013 at 23.35 - 00.10 - Helsinki (III)
Pentti Arpalahti

Half an hour before midnight, a dim greenishness was heard through the gauze. Maybe remnants of the previous burst, but forecasts motivate continued on-call. The warping began after the observation site change just after the tripod had been set up and the lens cover dried with a cuff. The peak period started at 23:49 and lasted a couple of minutes. The fires were well visible and the rays splashed all the way to Otava, even though there was a cloud of gauze in between. The fading lights in the elevator separated ten minutes after midnight. Some of the shots went blurry when the lens cover got ...

Images: 4 pcs

Active aurora band

30.10.2013 at 23.25 - 23.44 - Helsinki (III)
Pentti Arpalahti

I made it to the observation site after eleven in the evening and despite the illumination of the outdoor trail, the dim gauze belt separated me with the naked eye. I was afraid it would be the afterglow of a show that passed, but the belt in the elevator brightened and the best warping ignited at 23:35 and lasted for ten minutes.

Images: 4 pcs

Auroras seen through breaks in the clouds

20.8.2014 at 00.07 - 00.24 - Helsinki (II)
Pentti Arpalahti

While staring at the last possible night clouds from the pictures, I wondered that there shouldn't have been a type defect in the cell, that oblique streaks would appear in the picture. There was nothing wrong with the cell.

Images: 2 pcs

Aurora rays

12.9.2014 at 23.00 - 23.50 - Uppsala (II)
Pentti Arpalahti

The observation site was the edge of the sports field south of Uppsala. No tripod was then found in the foreign place, but at the edge of the field in the wound trunk a knot stuck out appropriately to provide enough support for the five-second exposure. The dim light in the north was first suspected to be the center lights, but the camera screen showed the color green and the dim arc gradually rose higher. The first splash convinced the fires to break out and I dared to invite more spectators to the scene. That's why the ray show started and one of the viewers got to see their first repos....

Quiet aurora band

30.9.2014 at 23.58 - Maarianhamina, Ahvenanmaa (II)
Pentti Arpalahti

As the ship left Mariehamn in a northerly direction at very low level, the greenery of the northern lights belt stood out faintly to the naked eye.

Aurora rays

15.10.2014 at 01.50 - 01.54 - Helsinki (II)
Pentti Arpalahti

After nine o'clock in the evening and again after ten o'clock in the evening, I photographed gigantic clouds of fog, among which nothing could be found to suggest a repo with any adjustments. Poor pictures went to the trash. While going to bed, I still had to glance at the brightened sky, and through the window it shone with a wonderful greenery. Rig your neck in a minute and get full speed to the edge of the ball field. The camera was just in hollow as a long beam splashed towards Otava’s Mizar and Alcoria. Then the fires went out.

Images: 2 pcs • Comments: 2 pcs

Quiet aurora arc

17.2.2015 at 02.35 - 02.40 - Helsinki (II)
Pentti Arpalahti

Only the dim uncertain arc stood out from the camera screen at two o'clock, but half an hour later, a ray of rays from northwest to northeast in five minutes stood out with the naked eye. Then the arc faded again so dim that it could not be seen with the naked eye.

Images: 8 pcs

Search result contains observations from time period 1.1.2000 klo 00.00 - 22.5.2022 klo 7.33.