Koichi Itagaki has discovered a supernova in M101.
IAU Designation: SN 2023ixf
Coordinates (J2000): RA = 14:03:38.580 DEC = +54:18:42.10
Discovery date: 2023-05-19 17:27:15.000 (JD=2460084.2272569)
Spectroscopy indicates it is a type II SN at a very early phase, and that at "a distance of only ~6.4 Mpc, this would represent among the closest core-collapse supernovae found in the past several decades".
TNS spectra looks real, reported magnitudes range from 14.9 to 15.9 depending on filter. What OTA are you using? What is your approximate magnitude limit in your 30s exposures. Too many clouds, for too many weeks, here in central VA to follow up... maybe tomorrow night.
Jim DeYoung (DEY)
I have an image set (5x120s) from 05/13. It does not look like it was there on the 13th.
Telescope: Celestron RASA f/2 203mm
Camera: ZWO ASI 183MC
Filter: IR Cut
Below is a link to the images:
I took a photo from Seattle on 2023-05-18.5 (average)
About 60 exposures @ 120sec
RedCat 51, 250mm focal length, 51mm aperture.
ZWO ASI585MC Camera
I have my stacked and processed photo, but have NO IDEA how to upload this to the AAVSO portal to help with this study. Any help would be appreciated.
I also captured images of M101 during the night of the SN. Mine were taken in Ninigret Wildlife Refuge in Rhode Island, 2023-05-19 around 1AM.
About 64 exposures @ 180sec
Z61, 360mm FL, 61mm aperture
Canon EOS 200D
I also have a stacked and processed photo but am unaware of how to submit my data to AAVSO to aid with the study of this event.
Lee Rocha (The_Celestial_Creole)
AAVSO Alert Notice 826 reports on the supernova SN 2023ixf in M101 (NGC 5457 in UMa). Please see the notice for details and observing instructions.
There are threads for this object under the following AAVSO forums:
Please subscribe to these threads if you are observing the supernova so you can be updated. Join in the discussion or ask questions there!
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
In Alert Notice 826 I neglected to include the offset of the supernova. SN 2023ixf is located 227.7" east and 134.1" south of the center of M101.