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

Ursa Astronomical Association

3 observations and 0 comments in queue.

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

Binocular comet ZTF

21.1.2023 at 02.05 - 06.00 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

Comet C/2022 E3 (ZTF) is quite close to Earth at 0.48au / 72 million km, and the comet is beginning to fill the cell of the longer focal length imaging equipment. Attached is a plate-corrected image where the size of the image field is 36'x28', corresponding to an image field of 750,000 km X 590,000 km at the comet's distance, the grid spacing in the direction of RA and Dec is approximately 210,000 km. Picture 1) Clear filter, 4x1min=4 minute exposure. A broad particle tail and two ion tails going in slightly different PA directions stand out. The ion tail in the direction of PA 30...

Images: 2 pcs

Binocular comet ZTF

2.1.2023 at 05.30 - 07.00 - Orimattila, Artjärvi, Viestikallio
Jorma Ryske, Etelä-Suomen kosmol. seura

Comet C/2022 E3 (ZTF) imaged with LRGB filters (Figure 1) with 4x10x1min exposures (2023-01-02_03:30UT) and in the second (Figure 2) mv mosaic image through the Clear filter with 10x1min exposures. The exposures are stacked according to the stars, registered when the comet is still moving that slowly, so in that sense this is a "correct" image. When you try to bring out the colors in the hair and tails, it goes a bit towards caramel saturation. The stringy ion tail stands out to the edge of the image by a degree, green comma 12'. A wide fan-like dust tail is in the direction of 0deg. Figur...

Images: 3 pcs • Comments: 2 pcs

Telescopic comet PANSTARRS

2.1.2023 at 04.50 - 05.30 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

Comet C/2022 A2 (PanSTARRS) pictured here in better conditions than in my previous night's "cloud pictures". An ion tail stands out up to the edge of the image more than half a degree in the direction PA 315deg, and a faint curved fan-like particle tail 13' in the direction PA 290-300deg. Exposure 14x2min from 2023-01-02 02:50UT. In the second picture, the star streaks have been reduced when stacking to separate the tails. This C/2022 A2 (PanSTARRS) has clearly caught up with C/2022 E3 (ZTF) in its final phase, and will be a good second :-)

Images: 2 pcs • Comments: 1 pcs

Telescopic comet PANSTARRS

1.1.2023 at 05.21 - 05.32 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

Comet C/2022 A2 (PanSTARRS) has brightened nicely, here is a 5x2min exposure stacked according to the nucleus. Unfortunately, the upper clouds started to thicken immediately after the first exposure 2023-01-01 03:21UT, which appears in the image as fading stars. A surprisingly long forked tail can be seen 23' in the direction PA 315deg. Coma diameter 5'.

Nova M31N 2008-12a

2.12.2022 at 20.38 - 22.00 - Orimattila, Artjärvi, Viestikallio (I)
Jorma Ryske, Etelä-Suomen kosmol. seura

A positive observation of the recurrent nova M31N 2008-12a in the galaxy M31. Image 1) 2022-12-02 18:38 UT 13x120s+5x60s Picture 2) 2022-12-02 19:04 UT 4x120s. The limit magnitude in figure 1 is 19.1. Nova appears very faint at the marker. Also observed in Tenerife: Recurrent Nova M31N 2008-12a: Discovery of the 2022 eruption with the Las Cumbres Observatory global Telescope network

Images: 2 pcs • Comments: 2 pcs

Nova M31N 2008-12a

13.11.2022 at 17.50 - 19.00 - Orimattila, Artjärvi, Viestikallio (I)
Jorma Ryske, Etelä-Suomen kosmol. seura

Negative observation of the recurring nova of galaxy M31 M31N 2008-12a, image time 2022-11-13 16:22 UT, exposure time 20x80s. Limit magnitude 19.4.

Telescopic comet Holmes Dust trail

30.10.2022 at 23.00 - 05.00 - Orimattila, Artjärvi, Viestikallio (I)
Jorma Ryske, Etelä-Suomen kosmol. seura

Comet 17P/Holmes had the most massive known comet outburst in 2007 October and its particle remnants are now orbiting the Sun. Different size ejected particles have formulated an hourglass pattern orbits, and the dust trail is brightest at the center of the pattern. Orekit "Dust Trail Kit -model" was created to model and calculate positions of the dust trail particles, which is described in this scientific publication Evolution of the dust trail of comet 17P/Holmes . Here is observation of this extremely dim dust trail taken 30/31.10.2022. Two separate three hour exposures were taken during th...

Images: 4 pcs

6073 Tähtiseuraursa

22.4.2022 at 01.34 - 02.40 - Orimattila, Artjärvi, Viestikallio (II)
Jorma Ryske, Etelä-Suomen kosmol. seura

After all, this newly named asteroid had to be described as (6073) 1939 UB The Star Society here cools its orbit. In the low shallow southern sky in the constellation of Libra, it still stands out at dawn in the morning. During the hour-long exposure, it moved for about an arc of minutes and stands out as a streak in the pint image and a clear motion in the 60x60s animation.

Images: 3 pcs

James Webb -avaruusteleskooppi

26.2.2022 at 23.27 - 00.15 - Orimattila, Artjärvi, Viestikallio (I)
Jorma Ryske, Etelä-Suomen kosmol. seura

The JWST James Webb Space Telescope is currently stationary at the L2 point, aligning its mirrors, and its apparent motion relative to the stars is distinguished in this animation exposed for 30x90s = 45 minutes. The apparent motion of the JWST with respect to the stars is mainly due to the annual orbit of the Earth (= observer) L2 point in its orbit around the sun, the daily rotation of the Earth (= observer) and the motion of the JWST around the L2 point. The brightness measured from the JWST image is mag 15.86. It is clearly, up to 1.5 magnitude brighter than the January observations. The a...

Comments: 3 pcs

Telescopic comet Churyumov-Gerasimenko

11.2.2022 at 00.30 - 00.50 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

The comet 67P / Churyumov-Gerasimenko is still visible with a nice long tail. In this bright 72% lunar light, the comet was captured with 15 minutes of exposure with a Clear filter. The inverted image no longer distinguishes the dust trail / dust trail seen in front of the comet in previous observations. Pictured in the lower left corner is the galaxy PGC 23643 mag15.81.

Images: 2 pcs

James Webb -avaruusteleskooppi

25.1.2022 at 21.35 - 22.00 - Orimattila, Artjärvi, Viestikallio (I)
Jorma Ryske, Etelä-Suomen kosmol. seura

On January 24, 2022 at 21:00 Finnish time, JWST parked the L2 points slowly. The motion of the JWST is shown in the animation below (24x60s = 24 minutes) and in the center of the stacked image (15x60s). During the 15-minute exposures, the JWST moved for 20 arcseconds. Even a few clouds and snowflakes went over the field of view during the exposures, dimming the image. It is already dim, the brightness of the JWST measured from the image is mag 17.34.

Images: 2 pcs • Comments: 2 pcs

Telescopic comet Borrelly

25.1.2022 at 18.57 - 19.18 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

The comet 19P / Borrelly is visible right from the early evening in the southwestern sky, albeit at a rather low altitude of about 25 degrees. The comet has a magnitude of 9 categories, which is nice and bright to photograph and is also suitable for visual observers even with smaller telescopes. Figure 1) An inverted image of a clear filter exposed for 9 minutes shows dull tails, one in the direction of PA 80 ° and the other apparently an ion tail in the direction of PA 70 ° with a length of about 18 minutes of arc, Koma about 6 'in diameter. Image field size 26'x 16 '. Figure 2) T...

Images: 3 pcs

Other storm phenomenon

15.1.2022 at 20.13 - 04.55 - Orimattila, Artjärvi, Viestikallio (I)
Jorma Ryske, Etelä-Suomen kosmol. seura

The pressure wave of the volcanic eruption in Tonga is shown in the graph of the pressure gauge of the Artjärvi Viestikallio (60.73N, 26.21E) weather station. The first pressure wave reached Viestikallio weather station on January 15, 2022, maximizing at about 20:13 EET / 18:13 UTC, and the second inverse-looking pressure wave on January 16, 2022 at about 04:55 EET / 02:55 UTC. #TongaVolcano . The observation category "Storm Phenomenon" should be interpreted a bit broadly in this observation :-)

Comments: 5 pcs

Binocular comet Leonard

5.12.2021 at 05.47 - 05.55 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

Comet C / 2021 A1 (Leonard) is relatively close to Earth at 0.42 AU and moves very fast relative to the stars. The attached 15x30s = 7.5min exposed L / Clear filter images show only a portion (less than 1 °) of the comet's long tail, which consists of several rapidly changing fan-shaped structures. Coma diameter 12 '. Figure 1) 15x30s L / Clear filter, stacked according to the comet's optocenter. Start 2021-12-05_0347 UTC. Figure 2) Animation 15 frame 30s, the comet's fast motion is shown during ~ 8 minute exposures. Start 2021-12-05_0347 UTC.

Images: 2 pcs

Telescopic comet Churyumov-Gerasimenko

5.12.2021 at 01.00 - 04.09 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

The comet 67P / Churyumov-Gerasimenko still dimly shows the dust trail accumulated from previous rounds of the comet in front of the core. My previous observation on this was 11/11/2021 https://www.taivaanvahti.fi/observations/show/102218 Picture 1) 30x30s Clear filter, stacked according to the stars, exposures from 2021-12-04_2257UT Figure 2) R filter 660nm / 70nm Figure 10x90s 2021-12-04_2318UT Figure 3) R filter CometCIEF processed. In addition to the tail, a particle jet directed to the lower left PA120 ° is distinguished Figure 4) CN filter 387nm / 15nm cyanide radical emission 3883Å Figu...

Images: 5 pcs • Comments: 2 pcs

Nova M31N 2008-12a

14.11.2021 at 18.46 - 20.45 - Orimattila, Artjärvi, Viestikallio (I)
Jorma Ryske, Etelä-Suomen kosmol. seura

The recurring nova M31N 2008-12a, which erupts in the M31 galaxy about every year, once again brightened into a detectable 18.5mag target this morning on November 14, 2021. Picture 1) Stacked picture of 30x90s exposures on November 14, 2021 at 19:00 between the light of the moon and even thin clouds. Figure 2) Animation of the situation on November 8, 2021 and November 14, 2021 Photometric measurements: #NAME DATE MAG MERR FILT M31N2008-12a 2459533.20185 18.531 0.0714 L M31N2008-12a 2459533.21329 18.534 0.0769 L M31N2008-12a 2459533.23041 18.419 0.0741 L M31N2008-12a 2459533.24182 18.528 0.069...

Images: 2 pcs

Binocular comet Churyumov-Gerasimenko

11.11.2021 at 01.30 - 04.30 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

I tried to make the comet 67P / Churyumov-Gerasimenko dust dust / dust trail more clearly visible with a longer exposure time of 30 minutes than with a 5-minute exposure taken two days earlier https://www.taivaanvahti.fi/observations/show/102096 . The dust trail was now dimmer. The transparency of the atmosphere may not have been as good as the 8.11.2021 observation or the dust trail is but dimmer because there are two more days on the perihelist. However, the dust / dust trail stands out in front of the comet's core, continuing beyond the image. The first negative image has normal exposur...

Images: 2 pcs

Telescopic comet Churyumov-Gerasimenko

9.11.2021 at 01.23 - 05.00 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

The comet 67P / Churyumov-Gerasimenko shows both the normal tail and the interesting dust trail in front of the comet in the negative images below. The dust trail has comet particles about 0.1 mm to 1 cm in size left by the comet in previous rounds. If the Earth went through this dustbin, it would show great stellar flights, but the Earth's orbit and the 67P / CG's orbits would not meet, unfortunately or fortunately. Figure 1) 5x60s Clear filter from 2021-11-09_02: 33UT Figure 2) Stacked 4 pcs 5x60s Clear filter from 2021-11-08_23: 33 UT, taken every hour. Stars reduced by image proces...

Images: 5 pcs • Comments: 3 pcs

Telescopic comet Schwassmann-Wachmann 1

9.11.2021 at 01.00 - 02.30 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

The 29P / SW 1 comet has had a superburst throughout the fall. Here's a comet pictured with LRGB filters 4x10x120s. At the heart of the comet stand out interesting showers.

Telescopic comet Churyumov-Gerasimenko

17.10.2021 at 00.05 - 06.00 - Orimattila, Artjärvi, Viestikallio (III)
Jorma Ryske, Etelä-Suomen kosmol. seura

67P / Churyumov-Gerasimenko presents his handsome almost 20 'long tail here, even though he is only a mag10 comet. 67P / CG is relatively close at a distance of 0.44au from Earth so Koma’s morphology is also starting to show. Figure 2 shows a 50 minute exposure with a narrow band cyan radical gas CN 3883Å filter treated with CometCIEF. It distinguishes two jets both in the direction of the normal tail PA 290 ° and also in the curved forward outgoing jet in the direction PA 110 °. Picture 1) 20x60s, L / Clear filter, 2021-10-17 02: 30UT, FoV 28'x18 ' Figure 2) 10x300s, narrowband 38...

Images: 4 pcs • Comments: 2 pcs

Search result contains observations from time period 1.1.2000 klo 00.00 - 5.2.2023 klo 3.10.