Observation by John Coffin: AG Draconis compared with Zeta Draconis:...

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John Coffin

Observer

John Coffin

Observed

2018 Oct 28 - 11:38

Uploaded

2018 Oct 31 - 11:48

Objects

Spectrum

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Constellation

Aquarius

Field centre

RA: 22^h08^m
Dec: -18°39'
Position angle: -20°01'

Field size

0°07' × 0°04'

Equipment

Alpy 600
Atik 460 EX
Celestron 8 Edge HD with 0.7 x reducer
AZ-EQ6
Lodestar off axis guiding

Exposure

6 x 600s

Location

Essex, UK

Target name

AG Draconis

Title

AG Draconis compared with Zeta Draconis: Spectra in Autumn 2018

About this image

This is a spectrum of the symbiotic star AG Dra which is currently being monitored by ARAS (a French Group) at the request of some professional astronomers. It is shown here compared with the reference star Zeta Dra. There is a problem calibrating the wavelength. It is accurate at wavelengths shorter than H beta, but around 3 A out towards the longer wavelengths. There has been much discussion about this on the spectroscopy forum. It may turn out to be a limitation of the Alpy spectrometer.

Files associated with this observation

agdra_20181028_878_J_Coffin.png (38.8 kB)

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Jeremy Shears, Andy Wilson

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