Observation by Robin Leadbeater: Two supernovae on the Draco-Boötes ...

Uploaded by

Robin Leadbeater

Observer

Robin Leadbeater

Observed

2022 Jul 26 - 22:33

Uploaded

2022 Jul 30 - 22:59

Objects

NGC5894
NGC5875

Equipment
  • ALPY 200 spectrograph
  • ATIK 428 ex camera
  • Celestron C11 SCT 280mm aperture f5.5
Exposure

3607, 4208 seconds

Location

Wigton Cumbria UK

Target name

SN 2022pgf, SN2022oqm, NGC 5894, NGC 5875

Title

Two supernovae on the Draco-Boötes border

About this image

Two supernovae on the Draco-Boötes border 

SN 2022pgf,  NGC 5894 in Draco

This transient was discovered on 2022-07-22 by ZTF and classified as type II on 2022-07-22 based on a spectrum from the University of Hawaii 88 inch telescope. The spectrum here (overlaid with a template spectrum from SNID in red) which was taken on 2022-07-26 while still rising at magnitude 16.5 (g) suggests a narrow line type IIn.  These can be notoriously confused with Luminous Blue Variables in low resolution spectra however. An absolute g magnitude of at least -17.3 based on the current brightness (2022-07-30) and estimated distance of NGC 5894, strongly favours the supernova classification in this case.

SN 2022oqm,  NGC 5875 in Boötes

Just over the border in Boötes, this supernova was discovered early on the rise by ZTF on 2022-07-11 and initially classified by them as a type I supernova based on an early spectrum.  The  spectrum here was taken a few days past maximum on 2022-07-26 at magnitude 16.8 (g) when features had emerged allowing the more specific Ic classification. (Note the good agreement there between this spectrum and one taken using the Nordic Optical Telescope the following night.) 

Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.