Due Nuove Nove scoperte in M81
Due nuove Novae in M81 sono state scoperte dall'Osservatorio del Monte Baldo, rispettivamente il 5 e il 6 marzo. Per entrambe la scoperta è stata confermata da quella indipendente, dell'Astronomo Ceco, Kamil Hornoch (Osservatorio Ondrejov) che ha pubblicato (in entrambi i casi 24 ore dopo le nostre scoperte, le ATEL 17064 e 17066). I due transienti hanno ricevuto la sigla di AT2025dih ed AT2025dkp
L'ultima Nova scoperta dall'Osservatorio in M81 era stata la 2023bnl, il 10 febbraio 2023.
Discovery certificate for object 2025dih
TNS Astronomical Transient Report No. 246714
Date Received (UTC): 2025-03-04 22:54:16
Sender: Flavio Castellani
Reporting Group: None Discovery Data Source: None
Flavio Castellani report/s the discovery of a new astronomical transient.
IAU Designation: AT 2025dih
Coordinates (J2000): RA = 09:55:43.430 (148.930958) DEC = +69:05:15.40 (69.087611)
Discovery date: 2025-03-04 20:50:43.000 (JD=2460739.3685532)
Potential host galaxy: M81
Remarks: Flavio Castellani report the discovery by F.Castellani, V.Andreoli, R.Belligoli of a PNV on a co-added 24*180 images (Mag.19.2R +-0.2 - USNOB1 catalogue) in the host galaxy M81 at Monte Baldo Observatory, Ferrara di Monte Baldo, Verona, Italy (A99), in the course of Italian Supernovae Search Project using a 0.40m f/7 Dall-Kirkham telescope (+ Moravian G4-9000 KAF CCD unfiltered CCD camera). No stellar source is visible at the position of the transient in our past images including reference image dated 2025/02/20.89375
ATEL 17064
Independent Discovery of a Probable Nova in M81
ATel #17064; K. Hornoch (Ondrejov), H. Kucakova (Charles University), A. W. Shafter (SDSU)
on 5 Mar 2025; 20:11 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Allen W. Shafter (ashafter@sdsu.edu)
on 5 Mar 2025; 20:11 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Allen W. Shafter (ashafter@sdsu.edu)
Subjects: Optical, Nova, Transient
Referred to by ATel #: 17066
We report the independent discovery of a probable nova in M81 on a co-added 5400-s unfiltered CCD frame taken on 2025 Mar. 5.160 UT with the 0.65-m telescope at Ondrejov. The new object is visible also on a prediscovery co-added CCD frame taken on Mar. 4.063 UT with the same instrumentation under poor conditions (dense cirrus clouds).
The object was independently discovered on Mar. 4.869 UT by F. Castellani et al. and designated as PNV J09554343+6905154 = AT 2025dih. (LEGGI IL resto della ATEL....)
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Discovery certificate for object 2025dkp
TNS Astronomical Transient Report No. 246809
Date Received (UTC): 2025-03-05 22:24:06
Sender: Flavio Castellani
Reporting Group: None Discovery Data Source: None
Flavio Castellani report/s the discovery of a new astronomical transient.
IAU Designation: AT 2025dkp
Discoverer internal name: OMB-PNV24
Coordinates (J2000): RA = 09:55:12.610 (148.802542) DEC = +69:02:46.20 (69.046167)
Discovery date: 2025-03-05 21:04:59.000 (JD=2460740.3784606)
Potential host galaxy: M81
Remarks: Flavio Castellani report the discovery by F.Castellani, V.Andreoli, R.Belligoli of a PNV on a co-added 24*180 images (Mag.18.8R +-0.2 - USNOB1 catalogue) in the host galaxy M81 at Monte Baldo Observatory, Ferrara di Monte Baldo, Verona, Italy (A99), in the course of Italian Supernovae Search Project using a 0.40m f/7 Dall-Kirkham telescope (+ Moravian G4-9000 KAF CCD unfiltered CCD camera). No stellar source is visible at the position of the transient in our past images including reference image dated 2025/03/04.84208
ATEL 17066
independent Discovery of a Second Probable Nova in M81
ATel #17066; K. Hornoch (Ondrejov), H. Kucakova (Charles University), A. W. Shafter (SDSU)
on 6 Mar 2025; 22:58 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Allen W. Shafter (ashafter@sdsu.edu)
on 6 Mar 2025; 22:58 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Allen W. Shafter (ashafter@sdsu.edu)
Subjects: Optical, Nova, Transient
We report the independent discovery of another probable nova in M81 on a co-added 3600-s unfiltered CCD frame taken on 2025 Mar. 6.138 UT with the 0.65-m telescope at Ondrejov. Additionally, we found the new object visible also on a prediscovery co-added CCD frame taken on Mar. 5.160 UT with the same instrumentation. Since the new object is laying on top of a brighter spot in the M81 background it was missed during initial search of the 5.160 UT frame (see ATel #17064), also due to its intrinsic faintness at that time.
The object was independently discovered on Mar. 5.827 UT by F. Castellani et al. and designated as PNV J09551261+6902462 = AT 2025dkp. (LEGGI IL resto della ATEL.... )