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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.

Yaogan 20A ja 20B

31.8.2016 at 01.57 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

Two bright satellite flashes close to each other. I did not find a match in HeavensAbove. The NOSS satellites were heading in the same direction, but not exactly there. EDIT: Identified as a Chinese satellite pair Yaogan 20A and 20B

Images: 2 pcs • Comments: 1 pcs

Vesta

22.3.2021 at 23.00 - Muurame (IV)
Arto Oksanen, Jyväskylän Sirius

Asteroid Vesta in the constellation of Leo. Vesta was recently in opposition in early March and its brightness is about 6 magnitudes, so it may be visible to the naked eye in good conditions. Vesta is the brightest of the asteroids.

Images: 2 pcs

Venus

6.5.2012 at 14.00 - Hankasalmi (III)
Arto Oksanen, Jyväskylän Sirius

Venus was well visible during the day through the telescope of the Hankasalmi Observatory. The image below is taken with a webcam from the focal length of a telescope. The clear sky made it difficult to shoot and the dome of the observatory had to be used as a dimmer.

Comments: 2 pcs

Vega

1.9.2020 at 21.36 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

The first spectroscopic observation of the Hankasalmi Observatory. The spectrum of Vega has been described using a Star Analyzer 200 grating. The combination of the 40 cm RC telescope of the observatory and the SBIG STX-16803 CCD camera and filter changer has a spectral resolution of 0.9 nm / pix. The wavelengths of hydrogen are marked in the figure with blue lines. There is no very suitable target category for the stars in the astronomer, therefore it is the object of the deep sky.

Variable star V808 Aurigae

14.9.2020 at 23.14 - 05.00 - Hankasalmi, Murtoinen (V)
Arto Oksanen, Jyväskylän Sirius

One of the most interesting changing stars in the sky, the V808 Aurigae has brightened as stellar star flows again into the white dwarf. This more than five-hour light curve clearly shows the variation in star brightness over a 118-minute period. Deep and rapid eclipses are caused by the white dwarf being covered behind a dim companion star. The smaller eclipse seen before the main eclipse is caused by the flow of matter, which also darkens the white dwarf. The flow of matter is also noticeable in the form of an eclipse.

Images: 2 pcs

Variable star V808 Aur

21.3.2016 at 21.44 - 05.00 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

One of my favorite targets, the polar variable V808 Aurigae (formerly known as OT_J0711 + 44). The target is a compact binary star in which a white dwarf is surrounded by a lighter red dwarf star from which matter flows onto the surface of the white dwarf. However, there is no accumulation disk around the white dwarf but the flow of matter is directed to the magnetic poles of the white dwarf under the direction of a magnetic field. An eclipse, repeated every two hours and deep in depth of more than two, occurs once the red dwarf has its orbit in front of a brighter white dwarf. Dimming and bri...

Images: 3 pcs

Variable star V808 Aur

3.10.2018 at 23.10 - 06.26 - Hankasalmi, Murtoinen (III)
Arto Oksanen, Jyväskylän Sirius

The dimming polar variable V808 Aur (CSS 081231: 071126 + 440405) detected by the Hankasalmi remote telescope. In the series of observations of more than 7 hours, the so-called a hot spot on the surface of a white dwarf star (two levels of star brightness) and an eclipse of a white dwarf behind an orbiting star (red dwarf). The rotation time of the double star is 117 minutes and the eclipses are very deep and fast. In two consecutive 60-second exposures, the first one appears bright and the second does not appear at all.

Images: 4 pcs • Comments: 2 pcs

Variable star V485 Cen

15.3.2013 at 09.30 - 11.30 - San Pedro De Atacama, Chile (III)
Arto Oksanen, Jyväskylän Sirius

Confirmation with a remote telescope of the cataclysmic variable V485 Cen, from which the Hubble Space Telescope will make observations with its ultraviolet spectroscope tomorrow. The star had just had a short-lived eruption that threatened to make observations, but now the star has returned to a safe level of brightness. The light curve shows the exceptionally short rotation period of this double star, one hour. (There could be a "star" to choose from, although I guess the stars are in the "deep sky.")

Images: 3 pcs • Comments: 1 pcs

Variable star TCP J06373299-0935420

21.2.2019 at 20.50 - 21.10 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

A new changing star in the constellation of Unicorn. Coordinates: 06 37 33.01 -09 35 42.2. Found on 21.2.2019, discovered by Japanese star enthusiast S. Kaneko, Kakegawa. The subject is pretty low here in Finland, but I got a couple of hours of time from it, which shows a brightness variation of about 0.1 magnitude (periodic?). Brightness at the beginning of the observation period V = 10.28.

Images: 2 pcs

Variable star TCP J05074264+2447555

9.11.2017 at 05.13 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

Another observation of the gravitational lens event. The star had clearly dimmed from the previous observation and is now 12.8 magnitude (V). The second figure shows a light curve with measurements of its own two observation points (OAR), in addition to the ASAS-SN telescope ( Shappee et al. (2014) and Kochanek et al. (2017). ) And a calculated gravitational lens curve fitted to the observations.

Images: 2 pcs • Comments: 3 pcs

Variable star SS Cygni

18.4.2016 at 23.48 - 01.00 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

Dwarf Nova SS Cygni in the eruption. This star has been closely followed in the AAVSO observation campaign, which is helping the international multi-frequency observation campaign. The discharge is detected e.g. X-ray and radio frequencies. The eruption began on April 18, 2016, and the enthusiast's observations triggered the observations of professional telescopes, e.g. With Swift satellite telescope. The eruption is closely monitored throughout its duration (from one week to four weeks). Enthusiastic visual observations and CCD observations are very important for the success of an observa...

Images: 4 pcs • Comments: 1 pcs

Variable star PNV J19150199+0719471

15.6.2013 at 09.00 - 13.00 - San Pedro De Atacama, Chile (IV)
Arto Oksanen, Jyväskylän Sirius

Cataclysmic variable PNV J19150199 + 0719471 found on the last day of May detected by a telescope in Chile. The object, initially considered novana, was identified as a dwarf nova (UGWZ) spectroscopically and now shows in a light curve typical superoutburst-related superhumps.

Images: 2 pcs

Variable star OV Bootis

28.3.2017 at 21.15 - 05.00 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

OV Bootis is a rarely erupting WZ Sge-type cataclysmic variable. During observation, it is in the eruption and the light curve shows eclipses.

Images: 2 pcs

Variable star M31N 2008-12a

14.9.2020 at 23.37 - Hankasalmi, Murtoinen (III)
Arto Oksanen, Jyväskylän Sirius

Negative observation for the recurring Nova M31N 2008-12a in the Andromeda Galaxy, which is expected to next discharge during the rest of the year. The previous eruption was on November 6, 2019 and the eruptions recur approximately every year. The image is combined from twenty-five minutes of exposure and its boundary magnetism is about V = 20.8. The maximum brightness of the nova at the time of the eruption is about 18 magnitudes, so it would be clearly visible inside the circle marked in the image. Finding the next eruption as early as possible will help large professional telescopes get obs...

Variable star LSPM J1112+7626

16.3.2020 at 21.00 - 05.00 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

Mutual eclipse of a double star formed by two red dwarf stars observed with the Hankasalmi telescope last night. The orbital period of this blackout variable is 41.03 days. Observed center of eclipse: 2458925.437865 +/- 0.000313 HJD. More information about the observation site: https://iopscience.iop.org/article/10.1088/0004-637X/742/2/123

Variable star LP790-29

21.2.2013 at 09.00 - Antofagasta, Cerro Paranal, Chile (IV)
Arto Oksanen, Jyväskylän Sirius

The LP790-29 is a 16 magnitude magnetic white dwarf in the constellation of Water Snake. I spotted a star with Seppo Katajainen in Chile with an 8-meter VLT UT1 telescope. The observation consists of a 2-second CCD image, a star spectrum, and a polarization measurement. The main observation result is a circular polarization of about 9 percent. The magnetic field of the tens of millions of gauss of the star causes the observed polarization. Detection time 21.2.2013 09 UTC. (There is no very appropriate target category for white dwarf stars, so this is indicated as a variable star, even though t...

Images: 3 pcs • Comments: 1 pcs

Variable star KIC 8462852

18.10.2015 at 20.17 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

The star KIC 8462852, which was observed by the Kepler space telescope to dim very peculiarly. It has even been speculated that dimming is caused by an artificial structure built by a foreign civilization. I added the item to my observation list if I could detect the next dimming. http://www.tiedetuubi.fi/avaruus/outo-tahti-kutkuttelee-median-sensaationappulaa

Comments: 4 pcs

Variable star KIC 8462852

6.9.2017 at 23.45 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

KIC 8462852, better known as the Star of Tabby, has been on my watch list for as long as its strange dimming is generally known (see https://en.wikipedia.org/wiki/KIC_8462852). In my observations, the star has remained stable at a magnitude of V = 11,865, only very slowly and evenly dimming. In the observation on September 5, it was a bit dimmed from the observation of the previous night, but on September 6, 2017, there was no room for uncertainty in the observation, a new dimming was happening in the star! Observations from this latest dimming also came from other observatories (see http://ww...

Images: 2 pcs

Variable star KIC 8462852

27.3.2018 at 21.38 - 00.54 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

The star of Tabby (KIC 8462852) dimmed again, now about 5 percent, which is more than ever since Kepler’s observations. I received observations of dimming from three consecutive nights showing star dimming (near minimum brightness) and brightening to normal brightness.

Images: 3 pcs • Comments: 1 pcs

Variable star IY UMa

20.3.2020 at 23.30 - 05.00 - Hankasalmi, Murtoinen (IV)
Arto Oksanen, Jyväskylän Sirius

Cataclysmic variable IY UMa in superoutburst. The observation made at the Hankasalmi Observatory shows three eclipses. https://www.aavso.org/vsx/index.php?view=detail.top&oid=37346

Images: 2 pcs • Comments: 5 pcs

Search result contains observations from time period 1.1.2000 klo 00.00 - 11.5.2021 klo 4.48.