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

Ursa Astronomical Association

1 observations and 2 comments in queue.

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

Exoplanet HAT-P-36b

22.3.2021 at 20.06 - 01.26 - Jyväskylä (II)
Harri Kiiskinen, Jyväskylän Sirius

This exoplanet is a gas planet about the mass of Jupiter, but twice the size of Jupiter, orbiting its parent star at 1,044 light-years away in 2.15 days. I took 270 pictures of the star in about five hours and measured the light curve from them using the HOPS program found on the ExoWorlds Spies page.

Images: 3 pcs

Exoplanet TIC 236887394.01

5.11.2020 at 19.51 - 00.15 - Jyväskylä (III)
Petri Tikkanen, Jyväskylän Sirius

This is my first exoplanet observation! The telescope was Unistellar's eVscope and the observed star was TIC 236887394.01 (TOI 1465.01) or GAIA 2244830490514284928, where it can be found e.g. From Sky Safari. The data revealed that the crossing started 6.9 minutes earlier than predicted and the eclipse was slightly weaker than predicted. A few clouds and intermittent fog were interfering with the observation and although it is also visible in the data fortunately it did not prevent the detection of overflow! Image courtesy of Seti

Images: 3 pcs

Exoplanet HAT-P-32b

9.11.2020 at 20.05 - 01.38 - Jyväskylä (II)
Harri Kiiskinen, Jyväskylän Sirius

My third exoplanet observation and the second with an 85mm lens tube. It is quite comfortable to see these even with a small stock. HAT-P-32b is a hot Jupiter, an exoplanet larger than Jupiter that orbits its parent star around 2.15 a day. The parent star is about 1,000 light-years from Earth.

Exoplanet WASP-52b

16.10.2020 at 19.57 - 22.46 - Jyväskylä (II)
Harri Kiiskinen, Jyväskylän Sirius

Inspired by my first and successful exoplanet observation a couple of weeks ago, I decided to try something similar with a small home fleet and it worked just fine with an 85mm lens tube. The WASP-52b is easy to detect as the dimming is over 30 mmag and the dimming lasts only 109 min. A planet slightly larger than Jupiter orbits its Sun, a larger star, for 1.75 days. The subject is about 450 light-years away.

Images: 4 pcs

Exoplanet HAT-P-1b

5.10.2020 at 22.55 - 03.21 - Hankasalmi, Murtoinen
Harri Kiiskinen, Jyväskylän Sirius

I tried to detect an exoplanet for the first time and it worked beyond expectations. At 521 light-years away, the star ADS 16402 B (HAT-P-1) orbits the hot exoplanet HAT-P-1b, slightly larger than Jupiter, with an orbital time of only 4.5 days. More than 400 images, image alignments and brightness measurements of the object itself and a couple of reference stars with the HOPS program and a curve like this were created from it.

Images: 2 pcs • Comments: 2 pcs

Exoplanet HAT-P-23b

27.9.2020 at 22.39 - 02.00 - Nakkila (II)
Jarkko Suominen, Porin Karhunvartijat

Here is my first observation of exoplanet overflow. Despite the difficulties and the early departure, I got enough data to observe the fading of the star. Also note from that that the brightness would have just been about to rise, but I had an early awakening and had to go to bed. The intention would be for the Bear Guards to take part in the ProAm project with the association's existing equipment and I must now say that this is our promising project!

Images: 3 pcs • Comments: 1 pcs

Exoplanet HAT-P-17b

19.9.2020 at 21.00 - 01.00 - Kirkkonummi (III)
Teemu Willamo, Tuomas Salo, Ursa (Helsinki)

We detected an overflow of the exoplanet HAT-P-17b from the Metsähovi Observatory of the University of Helsinki in Kirkkonummi. The overpass began very soon after dark, so we were in a hurry to find the destination, and we were a few minutes late from the predicted start of the overpass. The figure below shows the brightness of the parent star HAT-P-17 in magnitudes relative to the two reference stars. A clear dimming lasting about 4 hours can be seen as the planet passes in front of the parent star. Some strange throw is also noticeable, which may be due to us focusing the image somewhere new...

Images: 2 pcs

Exoplanet HAT-P-53 b

11.1.2019 at 19.50 - 22.34 - Metsähovi, Kirkkonummi (I)
Teemu Willamo, Juha Tauriainen, Sami Kivistö, Tuomas Salo, Ilja Pippa, Ursa (Helsinki)

We detected an overflow of the exoplanet HAT-P-53 b from the Metsähovi Observatory of the University of Helsinki. In the figure below, the brightness of the star HAT-P-53 (marked in green in the lower figure) is measured compared to the corresponding reference stars (marked in red). The measurements are noisy but the overpass is just perceptible. Apparently the crossing had started earlier than predicted as it would seem that we were late from the start.

Images: 2 pcs • Comments: 1 pcs

Exoplanet TrES-2 b

10.10.2018 at 20.15 - 22.00 - Kirkkonummi (II)
Teemu Willamo, Tuomas Salo, Ursa (Helsinki)

An observation from the Metsähovi Observatory of the University of Helsinki about the overflow of the exoplanet TrES-2 b. The orange ticks in the image are single 30 s exposures, and the blue curve averages 5 consecutive exposures. The magnitude is calculated as the average of the two reference stars and normalized so that the average of the first 10 data points is 0. In the CCD image, TrES-2 is the lowest star circled in red. The other two circled stars served as reference stars against which the brightness of the object was compared.

Images: 2 pcs

Exoplanet WASP-84 b

17.3.2018 at 20.18 - 00.40 - Kirkkonummi, Komakallio
Samuli Vuorinen, Kirkkonummen komeetta

I dedicated another evening to such a more scientific measurement instead of beautiful images. I tried to observe when the exoplanet WASP-84 b passes in front of its parent star, dimming the star by about one and a half percent. Wise from the previous exoplanet observation, I focused the images a little this time and lengthened the lengths of the individual exposures to better get rid of the noise caused by atmospheric scintillation. Eventually, 380 measurement points were accumulated and I recovered the entire overflow before the clouds came. In the figure, the gray dots are the actual measur...

Comments: 3 pcs

Exoplanet XO-2N b

18.2.2018 at 19.36 - 23.31 - Kirkkonummi, Komakallio
Samuli Vuorinen, Kirkkonummen komeetta

I had been using the Exoplanet Transit Database for a long time to make predictions about the fading of stars caused by exoplanets, and last night there was a clear weather and a suitable exoplanet at the same time. I photographed the XO-2N star for about four hours at the time of the predicted dimming, and subsequently analyzed the images with AstroImageJ software. The star showed, as it did, a dimming of about 10 millimagnities at about the right time! I was still using the program to fit the model to the observations, which is shown in the pictures as a green curve. All 627 data points are ...

Comments: 2 pcs

Exoplanet TrES-5 b

29.3.2017 at 01.26 - 04.58 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

This is the third time series of our observation group on this subject. Previous observations were made on March 12 , 2015 and March 27, 2016 . We measured the following properties for the object (in official parentheses): travel time 95 min (111 min), parent star dimming 21.4 mmag (20.6 mmag), planet radius Rp = 1.2 Rjup (1.2 Rjup) and orbit radius a = 0.03 AU (0.02 AU). More information here: Open Exoplanet Catalog

Images: 5 pcs • Comments: 4 pcs

Exoplanet TrES-2 b

23.3.2017 at 23.49 - 03.42 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

TrES-2b is a Jupiter-sized and darkest known exoplanet. The planet orbits a Sun-like G0V spectral star in the constellation of the Dragon. We measured the following properties for the object (in official brackets): overrun duration 102 min (109 min), parent star dimming 17.4 mmag (15.7 mmag), planet radius Rp = 1.4 Rjup (1.2 Rjup), and orbit radius a = 0.047 AU (0.036 AU). More information here: Wiki , Youtube , exoplanet.eu

Images: 5 pcs

Exoplanet HAT-P-28 b

6.10.2016 at 20.11 - 01.16 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

We started the autumn exo observation season as soon as the first opportunity arose. An exoplanet at a distance of 400 parsecs was selected as the target. It orbits a star about the size of the Sun in about 3.3 days. Increased cloudiness hampered data collection towards the end of the time series. The fitting routine gave an overflow duration of 181 min. (official estimate 193 min) and a pit depth of 14.7 mmag (official 12.8 mmag). Learn more about the place here and here .

Exoplanet Qatar-1 b

22.3.2016 at 02.04 - 04.46 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

Qatar-1b is quite a popular destination among exo enthusiasts due to the short Transit and their frequent repetition as well as the comfortable depth of the pit. There was a bad timing of this observation but the actual time of the overrun hits the bottom of our pit very precisely. The fitting routine gave an overflow duration of 80 min. (official estimate 97 min) and pit depth 21.2 mmag (official 21.2 mmag). Learn more about the place here and here .

Exoplanet HAT-P-3 b

21.3.2016 at 21.34 - 01.35 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

There was also a small timing inaccuracy with this observation. The fitting routine gave an overrun duration of 113 min. (official estimate 123 min) and a pit depth of 10.4 mmag (official 12.3 mmag). Learn more about the place here and here.

Exoplanet TrES-5 b

27.3.2016 at 23.25 - 02.31 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

We re-described our first exo observation . This time, we were able to collect poorer and noisier observational data. The fitting routine gave an overflow duration of 116 min. (official estimate 111 min) and a pit depth of 18.2 mmag (official 20.6 mmag). Learn more about the place here and here .

Exoplanet TrES-3 b

16.3.2016 at 23.46 - 03.02 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

There was apparently a rush with this observation with the start, or there has been some other inaccuracy in the timing. The fitting routine gave an overflow duration of 75 min. (official estimate 81 min) and a pit depth of 28 mmag (official 27 mmag). Learn more about the place here and here .

Exoplanet WASP-52 b

27.12.2015 at 18.50 - 20.36 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

We qualified as an observation after careful re-analysis of the data of an old exoplanet observed during the Christmas holidays. The fitting routine gave an overflow duration of 100 min. (official estimate 109 min) and the depth of the pit is 23.7 mmag (official 27.1 mmag). Learn more about the place here and here .

Exoplanet HAT-P-10 b

7.1.2016 at 17.51 - 21.35 - Tampere
Jouni Raunio, Tampereen Ursa

These observations show the relative brightness during the crossing. The only natural explanation we came up with would be the sudden brightening of the parent star due to a flare eruption, for example. We got a crossing time of 3 h 27 min, while the official time would only be 2 h 39 min. Our data was noisier than usual this time.

Exoplanet TrES-2 b

27.12.2015 at 21.50 - 00.04 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

At the same time as one tube detected an exo , another telescope did the same with the other exo, i.e. here we went with the tactics of two tubes. We obtained a TrES-2 b exoplanet overflow duration of 100 min. when the reference value was 90 min. More information about the exo can be read e.g. from here .

Images: 2 pcs

Exoplanet HAT-P-22 b

27.12.2015 at 20.28 - 00.18 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

On Christmas holidays, I left for the association’s observatory to digest ham and make observations. Keli was so windy and Kuukin was visible that he really didn't bother to describe anything but exos. We obtained an estimate of 176 min for the overflow duration of the exoplanet HAT-P-22 b. when the reference value was 172 min. Other information about Exon can be found e.g. from here .

Images: 2 pcs

Exoplanet WASP-33 b

8.10.2015 at 22.11 - 01.50 - Tampere
Jouni Raunio, Matti Koskinen, Tomi Hyvönen, Kari Nyman, Tampereen Ursa

What makes the WASP 33b exoplanet interesting is the fact that it orbits the parent star which is the so-called the short-period Delta Scuti variable and the fact that the exoplanet itself is the hottest known exo at 3,200 ° C. An "atmosphere" has also been observed on the planet. The crossing started on October 8, 2015 at. 22:47 and lasted 163 min. The parent star is relatively bright at V magnitude 8.3, to which the overrun caused a drop in magnitude of 0.0151 in brightness. The conditions of observation were, for once, decent: a cloudless and moonless sky, although the object of observation...

Images: 3 pcs • Comments: 2 pcs

Exoplanet HAT-P-19 b

26.9.2015 at 21.09 - 01.12 - Tampere
Jouni Raunio, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

The previous exo observation has already shifted, if not the other one, but the reason has not been laziness but a whole series of failed observations due to the replacement and getting used to the equipment. The main reason is saturated parent and reference stars due to more bright optics and more tightly focused stars. The parent star HAT-P-19 is lighter, smaller and cooler than the Sun in the K-spectrum class at a distance of about 700 light-years at a V-magnitude of 12.9. So far, the only planet observed in the system is HAT-P-19 b and is slightly larger but lighter than Jupiter. The orbit...

Images: 8 pcs

Exoplanet TrES-5 b

12.3.2015 at 23.26 - 02.38 - Tampere (I)
Jouni Raunio, Kari Nyman, Tomi Hyvönen, Matti Koskinen, Tampereen Ursa

The first exotic subject of the Tampere Ursa filming team accidentally selected a slightly dimmer (V = 13.7) case after more than a thousand light years. Photos: 1) Light curve JR 2) Light curve MK 3) Photosif cones JR 4) Calibration stars JR 5) Observation evening plan The team involved in making this observation were Jouni Raunio, Matti Koskinen, Tomi Hyvönen and Kari Nyman. Learn more about exo TrES-5 b here and here .

Images: 5 pcs • Comments: 8 pcs

Exoplanet HAT-P-27/WASP-40 b

10.4.2014 at 00.38 - 04.45 - Tampere (II)
Tapio Lahtinen, Tampereen Ursa

Another exercise on exoplanet curves. This time a slightly brighter subject but the difficulty was brought by the smallness of the brightness change which was only 0.014 magnitude. Yes, you can now see the eclipse from that curve where you can see the duration of the eclipse (101.5 minutes). Towards the end, the brightness of the sky was already beginning to affect the observations (third image). The distance to the object is 665 light-years, and according to current information, the object has only one (a planet the size of Jupiter). Learn more . The luminance curve is now one with UT time (r...

Images: 3 pcs

Exoplanet Qatar-2 b

4.4.2014 at 00.27 - 03.49 - Tampere (II)
Tapio Lahtinen, Tampereen Ursa

There has been a few times practiced making light curves for changing stars and now it was time for a slightly more difficult challenge, that is, the exoplanet overflow light curve. Suitably, in the last sufficiently dark nights, the easiest way for the exoplanet to be covered in the constellation of Virgo happened. That exoplanet is called Qatar-2b and its brightness is mag 13 and during the passage the brightness dims to about 0.03 magnitude. The blackout lasts 108 minutes. The light curve became reasonably good, although in the final stage the weather deteriorated quite significantly. In th...

Images: 2 pcs • Comments: 7 pcs

Search result contains observations from time period 9.9.2010 klo 14.42 - 24.03.2023 klo 17.39.