[vsnet-alert 28074] ASASSN-25cm - 8.7 mag transient in Lupus
The ASAS-SN team has posted a bright transient on the TNS: ASASSN-25cm = AT 2025nlr 15:08:03.274 -40:08:29.58 g=8.7 https://www.wis-tns.org/object/2025nlr with the following comment: "Very bright, young transient, possibly a Galactic Nova; photometry likely uncertain as the object is close to/above saturation limit". The extinction in this direction is relatively low A(V) = 0.345, so a typical classical nova peaking at absolute magnitude M_V= -7.0 at 8 kpc distance would rise to V=7.9. Confirmation imaging, astrometry, filter photometry and classification spectroscopy are all highly desirable. Best wishes, Kirill
Dear Kirill and all, I have reported the spectrum to ATel. ASASSN-25cm is a new classical nova. https://www.astronomerstelegram.org/?read=16808 Best regards, Yusuke 2025年6月14日(土) 2:03 Kirill Sokolovsky <kirx@kirx.net>:
The ASAS-SN team has posted a bright transient on the TNS:
ASASSN-25cm = AT 2025nlr 15:08:03.274 -40:08:29.58 g=8.7
https://www.wis-tns.org/object/2025nlr
with the following comment: "Very bright, young transient, possibly a Galactic Nova; photometry likely uncertain as the object is close to/above saturation limit".
The extinction in this direction is relatively low A(V) = 0.345, so a typical classical nova peaking at absolute magnitude M_V= -7.0 at 8 kpc distance would rise to V=7.9.
Confirmation imaging, astrometry, filter photometry and classification spectroscopy are all highly desirable.
Best wishes, Kirill
-- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保 雄介 EMAIL: tampo@kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke@saao.ac.za ----------------------------------------------
The object referred to in ATel 16808 does not match the coordinates of ASASSN-25cm Cheers Robin -----Original Message----- From: Yusuke Tampo <tampo@kusastro.kyoto-u.ac.jp> Sent: 14 June 2025 19:28 To: Kirill Sokolovsky <kirx@kirx.net> Cc: vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp Subject: [vsnet-alert 28075] Re: ASASSN-25cm - 8.7 mag transient in Lupus Dear Kirill and all, I have reported the spectrum to ATel. ASASSN-25cm is a new classical nova. https://www.astronomerstelegram.org/?read=16808 Best regards, Yusuke 2025年6月14日(土) 2:03 Kirill Sokolovsky <kirx@kirx.net>:
The ASAS-SN team has posted a bright transient on the TNS:
ASASSN-25cm = AT 2025nlr 15:08:03.274 -40:08:29.58 g=8.7
https://www.wis-tns.org/object/2025nlr
with the following comment: "Very bright, young transient, possibly a Galactic Nova; photometry likely uncertain as the object is close to/above saturation limit".
The extinction in this direction is relatively low A(V) = 0.345, so a typical classical nova peaking at absolute magnitude M_V= -7.0 at 8 kpc distance would rise to V=7.9.
Confirmation imaging, astrometry, filter photometry and classification spectroscopy are all highly desirable.
Best wishes, Kirill
-- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保 雄介 EMAIL: tampo@kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke@saao.ac.za ----------------------------------------------
I also had to slightly adjust the coordinates to accomodate the star inside the aperture for photometry. Regards, Josch ----- Oorspronkelijk bericht ----- Van: robin@threehillsobservatory.co.uk Aan: "Yusuke Tampo" <tampo@kusastro.kyoto-u.ac.jp>, "vsnet-alert" <vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp> Cc: "vsnet-alert" <vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp> Verzonden: Maandag 16 juni 2025 10:53:25 Onderwerp: [vsnet-alert 28077] Re: ASASSN-25cm - 8.7 mag transient in Lupus The object referred to in ATel 16808 does not match the coordinates of ASASSN-25cm Cheers Robin -----Original Message----- From: Yusuke Tampo <tampo@kusastro.kyoto-u.ac.jp> Sent: 14 June 2025 19:28 To: Kirill Sokolovsky <kirx@kirx.net> Cc: vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp Subject: [vsnet-alert 28075] Re: ASASSN-25cm - 8.7 mag transient in Lupus Dear Kirill and all, I have reported the spectrum to ATel. ASASSN-25cm is a new classical nova. https://www.astronomerstelegram.org/?read=16808 Best regards, Yusuke 2025年6月14日(土) 2:03 Kirill Sokolovsky <kirx@kirx.net>:
The ASAS-SN team has posted a bright transient on the TNS:
ASASSN-25cm = AT 2025nlr 15:08:03.274 -40:08:29.58 g=8.7
https://www.wis-tns.org/object/2025nlr
with the following comment: "Very bright, young transient, possibly a Galactic Nova; photometry likely uncertain as the object is close to/above saturation limit".
The extinction in this direction is relatively low A(V) = 0.345, so a typical classical nova peaking at absolute magnitude M_V= -7.0 at 8 kpc distance would rise to V=7.9.
Confirmation imaging, astrometry, filter photometry and classification spectroscopy are all highly desirable.
Best wishes, Kirill
-- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保 雄介 EMAIL: tampo@kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke@saao.ac.za ----------------------------------------------
I think there was an accidental typo in the ATel address. The correct is probably this one https://www.astronomerstelegram.org/?read=17228 Regards, Alexander Tarasenkov пн, 16 июн. 2025 г. в 20:21, hambsch--- via vsnet-alert < vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp>:
I also had to slightly adjust the coordinates to accomodate the star inside the aperture for photometry. Regards, Josch
----- Oorspronkelijk bericht ----- Van: robin@threehillsobservatory.co.uk Aan: "Yusuke Tampo" <tampo@kusastro.kyoto-u.ac.jp>, "vsnet-alert" < vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp> Cc: "vsnet-alert" <vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp> Verzonden: Maandag 16 juni 2025 10:53:25 Onderwerp: [vsnet-alert 28077] Re: ASASSN-25cm - 8.7 mag transient in Lupus
The object referred to in ATel 16808 does not match the coordinates of ASASSN-25cm
Cheers Robin
-----Original Message----- From: Yusuke Tampo <tampo@kusastro.kyoto-u.ac.jp> Sent: 14 June 2025 19:28 To: Kirill Sokolovsky <kirx@kirx.net> Cc: vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp Subject: [vsnet-alert 28075] Re: ASASSN-25cm - 8.7 mag transient in Lupus
Dear Kirill and all,
I have reported the spectrum to ATel. ASASSN-25cm is a new classical nova. https://www.astronomerstelegram.org/?read=16808
Best regards, Yusuke
2025年6月14日(土) 2:03 Kirill Sokolovsky <kirx@kirx.net>:
The ASAS-SN team has posted a bright transient on the TNS:
ASASSN-25cm = AT 2025nlr 15:08:03.274 -40:08:29.58 g=8.7
https://www.wis-tns.org/object/2025nlr
with the following comment: "Very bright, young transient, possibly a Galactic Nova; photometry likely uncertain as the object is close to/above saturation limit".
The extinction in this direction is relatively low A(V) = 0.345, so a typical classical nova peaking at absolute magnitude M_V= -7.0 at 8 kpc distance would rise to V=7.9.
Confirmation imaging, astrometry, filter photometry and classification spectroscopy are all highly desirable.
Best wishes, Kirill
-- ----------------------------------------------
South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保 雄介 EMAIL: tampo@kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke@saao.ac.za
----------------------------------------------
Yes, I made a typo in the previous email. The correct one is what Alexander shared; https://www.astronomerstelegram.org/?read=17228 Best regards, Yusuke 2025年6月16日(月) 19:29 Александр Тарасенков <t9005780498@gmail.com>:
I think there was an accidental typo in the ATel address. The correct is probably this one https://www.astronomerstelegram.org/?read=17228
Regards, Alexander Tarasenkov
пн, 16 июн. 2025 г. в 20:21, hambsch--- via vsnet-alert < vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp>:
I also had to slightly adjust the coordinates to accomodate the star inside the aperture for photometry. Regards, Josch
----- Oorspronkelijk bericht ----- Van: robin@threehillsobservatory.co.uk Aan: "Yusuke Tampo" <tampo@kusastro.kyoto-u.ac.jp>, "vsnet-alert" < vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp> Cc: "vsnet-alert" <vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp> Verzonden: Maandag 16 juni 2025 10:53:25 Onderwerp: [vsnet-alert 28077] Re: ASASSN-25cm - 8.7 mag transient in Lupus
The object referred to in ATel 16808 does not match the coordinates of ASASSN-25cm
Cheers Robin
-----Original Message----- From: Yusuke Tampo <tampo@kusastro.kyoto-u.ac.jp> Sent: 14 June 2025 19:28 To: Kirill Sokolovsky <kirx@kirx.net> Cc: vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp Subject: [vsnet-alert 28075] Re: ASASSN-25cm - 8.7 mag transient in Lupus
Dear Kirill and all,
I have reported the spectrum to ATel. ASASSN-25cm is a new classical nova. https://www.astronomerstelegram.org/?read=16808
Best regards, Yusuke
2025年6月14日(土) 2:03 Kirill Sokolovsky <kirx@kirx.net>:
The ASAS-SN team has posted a bright transient on the TNS:
ASASSN-25cm = AT 2025nlr 15:08:03.274 -40:08:29.58 g=8.7
https://www.wis-tns.org/object/2025nlr
with the following comment: "Very bright, young transient, possibly a Galactic Nova; photometry likely uncertain as the object is close to/above saturation limit".
The extinction in this direction is relatively low A(V) = 0.345, so a typical classical nova peaking at absolute magnitude M_V= -7.0 at 8 kpc distance would rise to V=7.9.
Confirmation imaging, astrometry, filter photometry and classification spectroscopy are all highly desirable.
Best wishes, Kirill
-- ----------------------------------------------
South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保 雄介 EMAIL: tampo@kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke@saao.ac.za
----------------------------------------------
-- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保 雄介 EMAIL: tampo@kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke@saao.ac.za ----------------------------------------------
participants (5)
-
hambsch＠telenet.be -
Kirill Sokolovsky -
robin＠threehillsobservatory.co.uk -
Yusuke Tampo -
Александр Тарасенков