# AT 205nlr: a Galactic nova? **URL:** \ **Category:** Latest transients\ **Tags:** nova\ **Created:** [June 14, 2025, 1:32pm UTC](https://forum.astro-colibri.science/t/at-205nlr-a-galactic-nova/403 "2025-06-14T13:32:14Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Fabian.Schussler](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.astro-colibri.science/fabian.schussler/32/25_2.png) [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Post date:** [June 14, 2025, 1:32pm UTC](https://forum.astro-colibri.science/t/at-205nlr-a-galactic-nova/403/1 "2025-06-14T13:32:14Z")
A potential Galactic nova is being discussed: - [AT 205nlr](https://www.wis-tns.org/object/2025nlr) from ASASSN - internal name _ASASSN-25cm_ =\> [Astro-COLIBRI](https://astro-colibri.com/event:TNS2025nlr) - reported also [here](http://ooruri.kusastro.kyoto-u.ac.jp/mailman3/hyperkitty/list/vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp/thread/HYBHPGBHEITD6ETVXJMTLYLLA7ALMMBB/) - [exchange](https://forums.aavso.org/t/mag-8-7-transient-in-lupus-rising-nova/2669/2) from two amateur astronomers discussing their obs, with some caveats of their estimates for the magnitude based on comparison star selection =\> help with the confirmation of the magnitudes + classification is very welcome > **[Astro-COLIBRI](https://astro-colibri.com/event:TNS2025nlr)** > > Enabling real-time multi-messenger astrophysics discoveries ---
**Author:** ![Fabian.Schussler](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.astro-colibri.science/fabian.schussler/32/25_2.png) [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Post date:** [June 14, 2025, 6:31pm UTC](https://forum.astro-colibri.science/t/at-205nlr-a-galactic-nova/403/2 "2025-06-14T18:31:44Z")
AT 2025nlr has indeed been classified as a classical nova explosion. > **[ATel #17228: Spectroscopic Classification of ASASSN-25cm (=AT 2025nlr) as a...](https://www.astronomerstelegram.org/?read=17228)** ---
**Author:** ![roger.hellot.astro](https://avatars.discourse-cdn.com/v4/letter/r/f08c70/32.png) [@roger.hellot.astro](https://forum.astro-colibri.science/u/roger.hellot.astro)\ **Post date:** [June 15, 2025, 10:45pm UTC](https://forum.astro-colibri.science/t/at-205nlr-a-galactic-nova/403/3 "2025-06-15T22:45:59Z")
![SUM_20250614AT2025nlr-LGBr_c_a displayTXT2](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/2497c7e0adee734e076dfbb00920ad9630c4f04c.jpeg) AT 2025nlr has a Gaia-GBp Mag 7.8 since last night… An easy target. 2 seconds of exposure only. Sincerely, Roger Hellot AITP Observatory at SpaceObs SanPedro-Atacama-Chili\* TRBS Observatory at Rosheim (F-67560)\* ---
**Author:** ![Fabian.Schussler](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.astro-colibri.science/fabian.schussler/32/25_2.png) [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Post date:** [June 16, 2025, 9:10am UTC](https://forum.astro-colibri.science/t/at-205nlr-a-galactic-nova/403/4 "2025-06-16T09:10:55Z")
Thanks a lot for sharing this! Continued monitoring over the next days and weeks is very important for tis kind of target. ---
**Author:** ![viram](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.astro-colibri.science/viram/32/254_2.png) [@viram](https://forum.astro-colibri.science/u/viram)\ **Post date:** [June 17, 2025, 4:54am UTC](https://forum.astro-colibri.science/t/at-205nlr-a-galactic-nova/403/5 "2025-06-17T04:54:25Z")
I was just outside and made a visual observation of 6.4 magnitude. Comp stars from AAVSO; 58, 60, 63 Bright and easy to see. Andrew ---
**Author:** ![jeanpascal.vignes](https://avatars.discourse-cdn.com/v4/letter/j/e19b73/32.png) [@jeanpascal.vignes](https://forum.astro-colibri.science/u/jeanpascal.vignes)\ **Post date:** [June 27, 2025, 2:28pm UTC](https://forum.astro-colibri.science/t/at-205nlr-a-galactic-nova/403/6 "2025-06-27T14:28:07Z")
![AT 2025nlr](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/6377ca9470a65533131bf2e400f297ac2ebc16a5.png) 2025-06-26 G bp 6.25 2025-06-26 G rp 6.26 ---
**Author:** ![Fabian.Schussler](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.astro-colibri.science/fabian.schussler/32/25_2.png) [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Post date:** [June 27, 2025, 2:43pm UTC](https://forum.astro-colibri.science/t/at-205nlr-a-galactic-nova/403/7 "2025-06-27T14:43:27Z")
Still extremely bright! An easy target to keep an eye on… The nova has in the meantime also been detected to emit high-energy gamma-rays! > **[ATel #17249: Fermi-LAT Gamma-ray Observations of the Classical Nova V462 Lup...](https://www.astronomerstelegram.org/?read=17249)**