Type: ... information

Asked by MDV on 2017-10-09

Hi
One thing I do not know - not having studied Astronomy, etc. is this.

When you search and find an object in Stellarium, then you the this info [for example]:

Type: Emission Nebula (2,3,3)

1.
What (2,3,3) mean? I guess they are emission frequency spectrum, what does eachnumber refer to?
1,2,3,4 whatever else might come up

2.
Do these number actually change meaning if it was a different object - i.e. a cluster etc.?

3.
Do they also change meaning when together? 1,2 or 1, 2,2

I would be really please for an explanation and also 'possibly' a link to a page or pages about this.

Thank you
M

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Stellarium Edit question
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MDV
Solved:
2017-10-09
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2017-10-09
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2017-10-09
Alexander Wolf (alexwolf) said : #1

It's codes of morphological classification, please see morphological description for some details.

MDV (ubuntu-com-a) said : #2

But I thought morphological details is for 'shape/type' - i.e. Elliptical, spiral etc.

So, nothing to do with their Optical Spectrum.

Is there spectrum info on Stellarium [of the main subjects?

Thanks

Alexander Wolf (alexwolf) said : #3

elliptical/spiral/etc. may be coded in Hubble-de Vaucouleurs classification - e.g. SA(s)b (Details: https://en.wikipedia.org/wiki/Galaxy_morphological_classification). Spectrum of the galaxy... it's impossible :)

Different types of objects has different classifications.

MDV (ubuntu-com-a) said : #4

OK - thank you for your time.