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

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Robin Leadbeater


Robin Leadbeater


2022 Jul 26 - 22:33


2022 Jul 30 - 22:59



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

3607, 4208 seconds


Wigton Cumbria UK

Target name

SN 2022pgf, SN2022oqm, NGC 5894, NGC 5875


Two supernovae on the Draco-Boötes border

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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.) 

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