Observation by David Strange: NGC 5461 An emission nebula in M101

Uploaded by

David Strange

Observer

David Strange

Observed

2023 May 23 - 23:10

Uploaded

2023 May 25 - 10:20

Objects

NGC5461

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Constellation

Cetus

Field centre

RA: 03^h04^m
Dec: +04°03'
Position angle: +1°03'

Field size

0°06' × 0°03'

Equipment

RC10
SA100
ASI183MM

Exposure

12 x 60s

Location

Salcombe Regis, East Devon

Target name

NGC 5461

Title

NGC 5461 An emission nebula in M101

About this image

Robin Leadbetter pointed out the bright emission spectra from the nebulous patch in M101 which lies just to the north of the supernova. Here is a spectrum of NGC5461 showing emission lines of H beta, OIII, H Alpha and NII. I used H Balmer lines in Vega to calibrate the SA100 spectrum, but notice that the emission lines are redshifted with respect to the ground based state. H Beta is approx 30A redshifted. This works out at 1850 km/s which is much greater than the listed red shift of 241 km/s. I wonder where I have gone wrong!

Files associated with this observation

NGC5461_spectrum_20230523_dgs.jpg (233.9 kB)

Like this image

Gerard Cauchi, Andy Wilson, Robin Leadbeater, Graham Winstanley

Comments

Mike Harlow, 2023 May 25 - 15:20 UTC

That's a nice spectrum. Yes the emission nebulae in M101 are very obvious in spectra of the galaxy...#1, #2, #3.

Mike

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