Vendégcsillag-kereső

I've just found a ~19.9 magnitudes bright (faint) possible nova on my M31 images with a 0.43 m Dall-Kirkham telescope at Alnitak Remote Observatory, Sierra del Segura, Spain, with Luminance filter at 2025 September 10.9832UT. It might be the due eruption of the recurrent nova M31N 1963-09c. Preliminary co-ordinates: 00 42 57.73 +41 08 10.5 (J2000.0)

Róbert Fidrich and Tamás Tordai (HAA/VSS) report the independent discovery of a 17.2C magnitudes brigh possible nova in M31. Discovered using 13x180s co-added images made with the 0.3 Newtonian reflextor of T. Tordai, with Clear filter on 2025 Sep 04.8973UT. Nothing was visible on 10x180s images made on  2025 Sep. 03.8543UT with magnitude limit 19.4C. The discovery image with reference image subtracted      The discovery image

Az Alnitak Remote Observatory 43cm-es spanyolországi távcsövével az M31-ről péntek hajnalban (2025. aug. 15.0874UT) készített 4x90s-es összegképeimen találtam egy kb. 19 magnitúdós vendégcsillagot.  A Vend63 (AT 2025twt) koordinátái: 00 42 36.25 +41 14 43.1 (J2000.0) Frissítés: a galaxisszomszédunkban talált nóvajelölt a felfedezést követő napokban még elég halvány, 19 magnitúdó körül volt, de aztán néhány nap elteltével elkezdett fényesedni, és egy héttel a felfedezés után már 18,2-18,5 magnitúdó körüli értéket ért el.  Remélhetőleg a következő hetekben-hónapokban tovább fog fényesedni, és színképi megerősítés is születik róla. A júliusi nóvadömping után úgy néz ki, visszaállt a rend az Androméda-ködben, ugyanis Vend62 felfedezése után bő két hetet kellett várni az újabb extragalaktikus nóvajelöltre. Péntek hajnalban, miután átnéztem Tordai Tamás M31-ről készített képeit, nekiláttam a spanyolországi 43 centis távcsővel készített képeknek. Az M31 északi részéről készített k...

I've just discovered an ~18.3 magnitudes bright possible nova on my 4x90s images of the Andromeda galaxy made  with a 0.43 m Dall-Kirkham telescope at Alnitak Remote Observatory, Nerpio Spain, with Luminance filter on 2025. July 31.1187UT.  The nova candidate seems still rising: it was arond 19.0 magnitudes on my 4x90s co-added images made with the same telescope about half an hour earlier than the diccovery images, the same night. The discovery of Vend62 has been reported as AT 2025sro . Preliminary co-ordinates of AT 2025sro:  00 42 46.61 +41 18 06.2 (J2000.0). Vend62 (AT 2025sro)  is still brightening, on my recent images made 6 hours later (July 31.3666UT) with the 0.43m telescope at UDRO it was significantly brighter, around 16.5-17.0 magnitudes.   The discovery was made using the Alnitak Remote Observatories robotic telescope network, ARTA program.

I've just discovered a 17.5 magnitudes bright possible nova on my 3x120s images of the Andromeda galaxy made  with a 0.43 m Dall-Kirkham telescope at Alnitak Remote Observatory, Nerpio Spain, with Luminance filter on 2025. July 3.1087UT.  The nova candidate was already visible at around 18.3 magnitudes on 6x120s co-added images made with the same telescope on July 2.1082UT. Nothing was visible on 6x120s co-added images made on June 29.1264UT. The discovery of Vend60 has been reported as  AT 2025qdc and PNV J00425628+4114512 recpectively.  Co-ordinates of AT 2025qdc:  00:42:56.22 +41:14:51.6  (J2000.0). The astrometry was provided by Tamás Elek, Nyíregyháza-Oros, Hungary using the original discovery images).   Follow-up photometry, spectroscopy of AT 2025qdc and precize astrometry urgently needed. The discovery image. The observations were made using the Alnitak Remote Observatories robotic telescope network, ARTA program.

I've just discovered a bright (16.08C) possible nova on my 4x120s images of the Andromeda galaxy made  with 0.51m telescope of Utah Desert Remote Observatory at Great Basin Desert, Beryl Junction, Utah, USA with Luminance filter on 2024 October 24.3366UT. The discovery of Vend56 has been reported as AT 2024zaq and PNV J00424899+4116331 respectively. Co-ordinates of AT 2024zaq: 00 42 48.81 +41 16 30.1 (J2000.0)  The astrometry was provided by Tamás Elek, Nyíregyháza-Oros, Hungary using the original discovery images). Follow-up photometry and spectrum is urgently needed! The original discovery image   Reference image subtracted from the recent image.

 I've just found an extragalactic nova candidate on my 1x120s CCD image of M31 made with a Luminance filter of the 0.51m telescope of the iTelescope.net network at the UDRO on 20 October 2024, 02:27:38UT. It seems this is an independent discovery of AT 2024ynw (M31N 2024-10b) reported by the XOSS team this afternoon. My image was made ~10.5 hours before the XOSS discovery.

The extragalactic slow nova AT 2023oom (Vend51) reached maximum at 17.312R (0.038) on Wednesday morning (2024. January 17.). Update: Our latest photometry show it around  18.846CV (0.135) on Tuesday night (January 23/24).  Light curve of AT 2023oom (Vend51) based on the photometry of unfiltered CCD images made by Tamás Tordai, CCD images with Luminance filter made by Róbert Fidrich, and CCD images with BVR filters made by Allen W. Shafter.

I've just found a 20 magnitudes bright extragalactic nova candidate on my 10x120s stacked images made with Luminance filter using a 0.51m telescope Utah Desert Remote Observatory /UDRO/ at Great Basin Desert, Beryl Junction, Utah, USA (iTelescope,net network) on 2023 August 5  09:02UT. Co-ordinates: 00 46 52.59 +42 01 41.2  (J2000.0) This slow nova has been officially designated as AT 2023oom and PNV J00465260+4201428 respectively. The VSX record of AT 2003oom (= Vend51 ). Update on 26th September: recent spectrum made by Kenta Taguchi et. al. using the KOOLS-IFU attached to the 3.8-m Seimei telescope at Okayama Observatory, Kyoto University show that AT 2023oom (Vend51) is a slow nova. Discovery image with reference images subtracted: AT 2023oom was already visible on 12x60s stacked images made on the nights of 28/29 July, 30/31 July and 31 July/1 August using a 0.31m telescope with Luminance filter remotely at Nerpio, Spain (iTelescope,net network). However AT 2023oom...

During the regular check of my CCD images of M31 within the framework of our Vend-RNe program on 12.0664UT November 2022 I discovered a 16.6C bright possible nova at the following approximate position: 00 42 47.23 +41 16 19.8  (J2000.0). Update: it seem this is an independent discovery of PNV J00424719+4116196 which is probably identical with the recurrent nova M31N 1984-07a. My images were made around half day before the XOSS team discovery images. Update 2: M31N 2022-11b: Additional Photometry and Confirmation as the Fourth Reported Eruption of the M31 Recurrent Nova M31N 1984-07a ( ATEL #15779 ) The possible nova is clearly visible on the subtracted images (new image: 11/12 November, reference image: 10/11 November). The possible nova on my 4x45s stacked images made on 12th November 2022 01:35 UT with the 0.43-m f/6.8 reflector remotely at Mayhill, New Mexico, US using Luminance filter.