Classification certificate for object 2023gfj
TNS Classification Report No. 14816 [ 2023TNSCR.973....1V ]

Date Received (UTC): 2023-04-30 10:57:18
Sender: Vittorio Andreoli
Group: None

Andreoli.V ; Castellani.F report/s a classification of object: AT 2023gfj

Type: Other

Remarks: We obtained, From Monte Baldo Observatory (OMB) located in Novezzina (Italy), low resolution spectra by 0.25-m telescope + Alpy600 spectrograph (dispersion 4.9 Ang/pix) on 2023-04-26.851 (4x300s), on 2023-04-27.828 (3x300s) and V (Jhonson) photometry with 0.4m telescope + Moravian G4 CCD full frame on 2023-04-27.828 . Photometry reduction give V mag 12.8. The spectra show red continuum and TiO molecular bands ( 4760, 4954 ,4956 ,5448 ,5450 ,5847 ,6149 ,6357 ,6714 ,7087 Ang) typically feature of M-type stars. V mag and spectral features are correspondent with the near star ROSS 619 that have a very high proper motion (1069 , -5094) mas/yr in module 5204 mas/yr. If we assume that ROSS 619 is 2023gfj then the distance from the coordinates reported on SIMBAD (Wenger.M et al, 2000) by the coordinates presented on the TNS N°175337 is 2.4’ (144 arcsec) , this distance has been travelled in 27.67 years. This time scale is consistent with our hypothesis. We propose that the transient 2023gfj is ROSS 619 in the new position.

The following Classification spectrum was provided:

Obsdate: 2023-04-26 20:25:26
Instrument: Other
Telescope: Other

Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2023gfj