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

Ursa Astronomical Association

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Milky way

2.10.2021 at 23.15 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

#54, Bongaa 100 challenge, a truly dark starry sky, is, of course, a relative concept. If you can't visit the top of Mauna Kea or the Atacama Desert, what is a "really dark starry sky" in Finland? For myself, it is enough that the Milky Way is clearly visible and the star patterns are already difficult to perceive due to the number of stars. Such places can also be found in the Tampere area of Teisko, and I used a clear moonless evening to clearly see the challenge of object #52, Milky Way. The stellar abundance and the star clusters at the level of our home galaxy are always nice to scan ...

Comments: 1 pcs

Starscape image

29.8.2021 at 22.40 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

The 51 on the Bongaa 100 list, Algol, is a changing star, and I first tried to spot Algol at its dimmest. With Sky & Telescope’s Algol minimum counter, I got some possible dates for August-September, when Algol would shine dimmer than normal at this time of night, and on August 29, it wilted. Algol’s minimum was, according to Sky & Telescope, comfortably around eleven o’clock in the clear evening sky. I had previously noticed, in observing asses, that Algol, who shines with normal brightness, is quite close to the brightness of the Almach star in Andromeda. During the minimum, Algol was clearl...

M31

31.8.2021 at 00.20 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

Light pollution is already bothering the southern parts of Tampere, but I still made a drawing observation of the Andromeda galaxy bonga 100 challenge. Satellite galaxies were barely visible to the naked eye. #bongaa100

Albireo

29.8.2021 at 23.50 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

For me, the clearest way to detect an object 40 on the Bongaa 100 list, stars of different colors, is to make an observation of an Albireo double star, where the color difference between the components is quite striking. Because Isaac Newton studied the different colors of light in the 1660s, I used a visual copy of Isaac Newton’s small mirror telescope to observe it. Tube manufacturer Vixen introduced this 70mm f / 4 telescope to the astronomy celebration in 2009. The tube requires a table, and orientation was a bit challenging, but even at low magnification, the Albireo components stood out ...

Images: 3 pcs

Landscape image of a planet

7.8.2021 at 01.00 - Tampere (IV)
Pekka Rautajoki, Tampereen Ursa

Jupiter and Saturn shine bright in opposition, though not yet very high above the horizon. This drawing has a landscape view that also includes some dim Sagittarius constellation star from the #bongaa100 challenge- a couple of three stars are well visible to the naked eye even in urban conditions. The very large magnification could not be used for planetary observations with the telescope due to seeing, but in Jupiter the moons Io and Europa (marked with the letters I and E in the drawing) were especially pleased. Ganymedes and Kallisto (G / C) are also marked on opposite sides of the planet. ...

Perseids

13.8.2021 at 00.30 - 02.40 - Tampere (IV)
Pekka Rautajoki, Tampereen Ursa

The maximum night of Perseids was, amazingly, clear, so I spent just over two hours in a recliner in our backyard. For the first 25 minutes, no star flight was seen, but after that I recorded 13 asses and three random star flights. A few asses were clearly yellow, and some were quite bright - of course, you can't really see the dim ones near the city. In the composite image, I have drawn the trees and the building bounded by the horizon, and the starry sky is at about one o'clock position. There is an observation time for each stellar flight. The square of Pegasus was very visible at t...

Landscape image of a planet

15.5.2021 at 22.05 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

Venus hid among the purple evening clouds #bongaa100

Mercury

4.5.2021 at 22.30 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

Mercury in the evening sky #bongaa100

Partial solar eclipse

10.6.2021 at 13.35 - Tampere (IV)
Pekka Rautajoki, Tampereen Ursa

The weather at my observation site was sadly cloudy; during the first contact it rained and during the whole eclipse the sky was not completely clear in the direction of the Sun. However, as the rain subsided, I was able to make an observational drawing through a thin cloud through a white light filter — I left the hydrogen-alpha tube in favor of its box. Before the clouds increase, I also had time to spot a small pair of spots, the active area 2829. #bongaa100

Moon

14.4.2021 at 22.00 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

Bongaa 100 list item number 15, the country house, was well visible with 15x50 binoculars. The lunar sickle is 2.3 days old, so I can't quite replace the 2.1-day-old sickle I registered last month with bongaa 100 on the 11th list. #bongaa100

Sun

31.3.2021 at 13.50 - Tampere (IV)
Pekka Rautajoki, Tampereen Ursa

Bongaa 100 challenge target #36, star, made me wonder why I would choose. I didn’t want to record this as an automatic observation, although of course I could have done so with many other starry objects. I ended up immortalizing on paper the most important star to us, the Sun - however, it is the only star from which one can also record surface details! At the time of our observation, there was some spectacular protuberance on our chromosphere, some filaments, and a couple of Plage areas — no fireworks, but it was nice to make a drawing on a warm spring afternoon. In the second image, the spec...

Images: 3 pcs

Moon

21.3.2021 at 17.40 - Tampere (II)
Pekka Rautajoki, Tampereen Ursa

The Moon of the Bongaa 100 Challenge as seen in the day sky ( #12) with binoculars, and at the same time also the object #13, Moon at an angle. The second image shows both the Moon and the Sun on the low horizon. The moon was about 52 degrees lower at the time of the drawing, and the Sun was 46 degrees lower. The illuminated side of the moon still points a little upward from the observer's point of view - so the moon would seem to be quite oblique to the direction in which the Sun is! #bongaa100

Images: 2 pcs • Comments: 2 pcs

Moon

19.3.2021 at 20.40 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

For Bongaa 100 Challenge #84 , to see things bigger with a telescope or binoculars, a very suitable instrument is a copy of Galileo Galilei’s second telescope that has survived to this day. Galileo made meritorious observations that changed the world, e.g. Of the craters of the moon in 1609-1610 and published them in his book Sidereus Nuncius. The Galileo lens tube is a challenging observation device; the subjects are displayed in the correct direction but the image field is narrow and the magnified image appears as a blob at the end of a long dark tunnel. One characterization - as if you were...

Images: 3 pcs • Comments: 3 pcs

Polaris

9.3.2021 at 21.45 - 22.45 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

The North Star, or Polaris (bongaa 100 object number 45), is a multiple star whose A-component visible to the naked eye shines with the brightness of the 2nd magnitude. The dim 9th magnitude companion Alfa UMi B is still reasonably easy to see with a small telescope - the difference in brightness between A and B is quite dramatic. Since Polaris is only less than one degree from the celestial pole, the rotation of a pair of stars can be followed as a clear indication of the rotation of the Earth (or of course the rotation of the dome of the starry sky!). A right-turned pair of drawings is made ...

4 Vesta

9.3.2021 at 21.45 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

The bright asteroid 4 Vesta was well visible with binoculars in the constellation of Leo, north of the Star of Chertan; the image is marked with small lines. At the same time, I scanned the entire area of the Lion (bonga 100 #34) and recorded up the stars I saw with binoculars, at least roughly. When positioning the dim dots on black paper, it was good to think at the same time about the mystery of the darkness of the night sky, or the Olbers paradox (bongaa 100 item number 104). However, I did not see the lion galaxies in the sky of a light-polluted suburb. The thrill is that there are no ast...

Starscape image

2.3.2021 at 22.09 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

Landscape star in Hatanpää Manor Park in Tampere; two trees about 250 years old, Hat and Hat, stand out in the woods. However, my sources did not clearly identify which one is which, so I assume the Hat is on the left and the Hat is on the right. The trunk of each is branched, and the spruce on the right has two more full-height trunks left. The spruces are named after the parties that prevailed in 18th-century Sweden, and the trees were planted during Gustav III's visit to Tampere in 1775. Spruce can, in good conscience, mark bonga as the target of the 100 challenge #100, organism living ...

Images: 2 pcs • Comments: 1 pcs

ISS

3.3.2021 at 05.56 - 05.57 - Tampere (IV)
Pekka Rautajoki, Senja Salokannel, Ursa (Länsi-Suomi)

On the morning of March 3, it was clear both at the observation point marked on the map of Peka in Tampere and at the Senja observation site in Lahti (60.98397 N, 25.65267 E), when the International Space Station flew near the declining Moon on the southwestern horizon about 4 minutes before morning. What makes the observation interesting in terms of the bonga 100 challenge is that the observed parallax of the ISS with respect to the Moon from different observation sites is probably only possible on the surface of a spherical Earth. According to Pekka's observation, the ISS passed under th...

Comments: 2 pcs

Moon

27.2.2021 at 07.25 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

A couple of hours less than a full moon to the naked eye in the morning before sunrise; The shadow of the earth was nicely visible below the Moon; part of it in the observation drawing in dark blue at the bottom of the figure. The Moon has been nicely visible for a couple of days before and after the full moon, and at least for myself it’s hard to see the difference in days between the barely Moon and the full moon with the naked eye. Ursan bongaa 100 challenge features #8 Moon, full moon #16, Sea of #18), Sea of Tranquility ( #19), Sea of Rain ( #20) and Shadow of the Earth ( #67) #bongaa100

Starry sky image

28.2.2021 at 20.45 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

Observation of the Ursan Bongaa 100 campaign; Orion and Sirius facing south. Coincidentally, at the same time, a small plane approached Pirkkala Airport, the navigation lights of which I also immortalized in the drawing (bonga 100 #83). The observation also includes Orion ( #29), Orion's belt ( #30), Betelgeuse ( #46) and Sirius ( #47). Sirius is a great target for detecting the twinkling of stars ( #39) it flickered nicely in different colors. The second image has a four-second exposure of Sirius taken by hand with a 400mm lens; in the curve drawn on the cell, the varying colors of Sirius...

Images: 2 pcs

Venus ja Seulaset (M45)

3.4.2020 at 23.10 - Tampere (IV)
Pekka Rautajoki, Tampereen Ursa

Venus met Seulet beautifully. The weather was partly cloudy, and sometimes the objects were covered behind the cloud. However, a clear sky was enough to make an observational drawing.

Comments: 2 pcs

Partial lunar eclipse

17.7.2019 at 01.00 - Tampere (III)
Pekka Rautajoki, Tampereen Ursa

The sky became clearer after the rain, the fog rose from the ground, and the lunar eclipse was nicely visible at one time of the night — as long as I fetched a little further from the backyard, where the hills blocked visibility into the southern horizon. The half in the full shadow of the moon was very dark; the binoculars showed a hint of copper brown. The southern half, bathed in more light, was golden yellow, all the way to the southern edge. Great to see another lunar eclipse in the aftermath of the Chilean solar eclipse!

Comments: 2 pcs

Total solar eclipse

2.7.2019 at 15.23 - 17.40 - Peralillo, Valle de Elqui, Chile (V)
Pekka Rautajoki, Tampereen Ursa

The complete eclipse on the way to Stars and Space magazine was magnificently visible. The observation site outside Vicuña in the lap of the mountains was descriptive, and the arrangements worked perfectly. I made an observational drawing of the Sun before the start of the eclipse at about 3pm local time through a hydrogen-alpha tube to let us know what kind of prototypes would be expected. The biggest protu at 5 o'clock was big but dim - it looked very nice without filters during the perfect phase! The drawing made with the white light filter was made at about 3:40 p.m., when the eclipse ...

Images: 4 pcs • Comments: 6 pcs

Total lunar eclipse

21.1.2019 at 06.20 - 08.10 - Tampere (IV)
Pekka Rautajoki, Tampereen Ursa

For once, a complete lunar eclipse was seen without major cloud problems. During the perfect phase, the cloud curtain rose slightly to disturb, but otherwise the Moon remained in the clear sky. The perfect phase of the eclipse was quite dark. In its aftermath, the Moon was already low, and as the shadow receded, the bright part was much yellower than at the beginning of the eclipse. Instead of photographing, I made an observational drawing in three stages — with the full shadow covering about half of the Moon before the perfect phase, then at the time of the deepest eclipse itself, and finally...

Comments: 4 pcs

Partial solar eclipse

11.8.2018 at 12.10 - 12.20 - Tampere (IV)
Pekka Rautajoki, Tampereen Ursa

A leisurely warm and summery Saturday and a comfortable time to make an observational drawing of the Sun directly on black paper, skipping the usual pencil sketch.

Comments: 2 pcs

Search result contains observations from time period 1.12.2017 klo 00.00 - 28.10.2021 klo 06.18.