Observation by Mike Harlow: IC2149: Low resolution spectrum

Uploaded by

Mike Harlow

Observer

Mike Harlow

Observed

2022 Nov 21 - 00:40

Uploaded

2022 Nov 21 - 14:40

Objects

IC2149
Spectrum

Planetarium overlay









Constellation

Auriga

Field centre

RA: 05h56m
Dec: +46°03'
Position angle: +91°41'

Field size

0°22' × 0°11'

Equipment
  • 12inch F/6.8 Astrograph
  • Starlight Xpress H16 CCD
  • Astrodon luminance filter (400-700nm)
  • 26cm, 3-degree objective prism
Exposure

18 x 20 seconds

Location

Ipswich, UK

Target name

IC2149

Title

IC2149: Low resolution spectrum

About this image

A low resolution spectrum of Callum Potter's object of the month for November. IC2149 is a small but bright planetary nebula in Auriga.  So bright that in the image above, shown by tick marks, it is saturated with 15 second exposures.  The spectrum below the image shows emission images from the hydrogen Balmer series.  The brightest feature however is from OIII emission giving the nebula the green colour seen in, for example, Alan Thomas's recent image.  The is also a very weak feature near 5870A which could be due to HeI emission(?).  The spectrum of the central star isn't resolved but shows a strong continuum down to the 400nm cut-off of the filter indicating a hot star emitting plenty of blue light.

The field of view is the same for each pane above, 22 x 6 arc minutes, with north to the right.

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