Bejegyzések

Vend95: independent discovery of a flare star in front of M31

Kép
I've just found a rather bright transient on M31 images taken by Tamás Tordai tonight (28 September, 18:38 UT) . It appears to be an optical flare of a known foreground star .  The recent flare has been detected by Flavio Castelli et al. as AT 2026adgl just 21 minutes earlier than our  image was taken. Our images taken at 19:22 UT clearly show that the object had faded significantly during the 44 minutes since the previous set of images was obtained. Further investigation showed that the star was brightest on the 2×120 s images taken by Tamás Tordai at 18:33 UT, and then faded steadily on the images obtained later.

Vend94: independent discovery of the possible nova AT 2026acsi

Kép
I've just found a possible nova on my M31 images obtained this morning (September 23.3563UT) with the 0.51-m DeltaRho 500 PlaneWave telescope at UDRO. It appears to be identical to AT 2026acsi , which was reported by the XOSS team about 10 hours earlier. On my luminance-filter images, the object had an estimated brightness of about 19.0 mag, suggesting that it may have brightened since the discovery by the XOSS team.

Vend93: a quite bright possibe nova near the centre of M31

Kép
I've just found a quite bright (~18.3 mag) possible nova on my 3x90s images made with the 43cm CDK at Alnitak Remote Observatory, Nerpio, Spain on September 17.8925UT, using a Luminance filter. Coordinates of  Vend93:  00 42 40.9375 +41 15 37.109 (J2000.0) The discovery of Vend93 has been reported to the TOCP website as PNV J00424094+4115371  and to the TNS server as AT 2026abyx . Discovery image  The discovery was made using the Alnitak Remote Observatories robotic telescope network, ARTA program.

Hogyan szalasztottunk el egy fényes extragalaktikus szupernóvát?

Kép
Bár az elmúlt közel négy évben elsősorban az Androméda-ködben vadásztunk extragalaktikus nóvákra, az utóbbi időben egyre több viszonylag közeli galaxisról is készítettünk képeket azzal a céllal, hátha sikerült elcsípni vagy egy szupernóvát vagy - a nagyon közeli galaxisokban - egy fényes klasszikus nóvát. Múlt hét szerdán viszont valami oknál fogva, sikerült elszalasztanunk a Pegazus csillagképben található NGC 7331 galaxisban feltűnt szupernóvát - pedig ott volt a szemünk előtt :O Az alábbiakban ennek az okait próbálom boncolgatni, majd levonni a tanulságokat. Az akkor még csak kb. 17-18 magnitúdós SN 2026aaiv Tordai Tamás szept. 2-án hajnalban készített összegképén. A tél végi - tavaszi időszakban sajnos nem látszik tőlünk az Androméda-köd, ilyenkor - jobb híján -  a tavaszi égen látható fényes, közeli galaxisokat szoktuk fotózni Tordai Tamás barátommal. Pár hónappal ezelőtt, amikor már újra látszott az Androméda-köd, Tamás újított: a 30 centis távcsővel fotózott célpontok (M31 k...

Vend92: independent discovery of the possible extragalactic nova AT 2026abeq

Kép
Yesterday morning (Sept 10/11 night) I found a possible nova on my unfiltered M31 images made with the 43 cm CDK at the Alnitak Remote Observatory. While checking the relevant official website for recent discoveries, it turned out that the XOSS team had reported this guest star approximately 3.5 hours before me.  So it goes. The discovery image with reference subtracted. The discovery image

Vend91: very bright nova in M31

Kép
I've just found a quite bright (~18.2 mag) possible nova on my 4x90s images made with the 43cm CDK at Alnitak Remote Observatory, Nerpio, Spain on September 04.1512UT, using a Luminance filter. Coordinates of Vend91 : 00 42 50.3813 +41 18 58.764 (J2000.0) The discovery of Vend91 has been reported to the TOCP website as PNV J00425038+4118587 and to the TNS server as AT  2026aaom . Update on 11th September: Vend91 is still rising. By this morning it had brightened to approximately 15.2-15,4 magnitudes. Update on 12th September.  we now have three independent spectra, Vend91 is officially an FeII type extragalactic nova!  "Diff1x" image with reference image subtracted. Discovery image. M31 with Vend91 on 10th September, using the 28 cm RASA at UDRO (iTelescope.net), Green channel (TG)   The central region of M31 cropped, Vend91 marked Rencent image with te 43 cm CDK at UDRO, using Luminance filter Update on September 12: We now have three independent spectra of Ve...

Vend89: a possible nova in M31

Kép
I've just discovered an approximately 19.3C mag possible nova on on my M31 images made tonight (Aug. 18.1119UT) with the 0.43 m Dall-Kirkham telescope at Alnitak Remote Observatory, Sierra del Segura, Spain, using Luminance filter. Coordinates of Vend89 :  00 42 52.83 +41 10 59.6 (J2000.0) The discovery of Vend89 has already been reported to the TNS-server as AT 2026zdb and to the TOCP website as PNV J00425283+4110596 .  The discovery image The discovery was made using the Alnitak Remote Observatories robotic telescope network, ARTA program.