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
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
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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
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vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp
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Kirill Sokolovsky -
robin＠threehillsobservatory.co.uk -
Yusuke Tampo