Galaxy Zoo Talk

Star or round Galaxy?

  • stefku by stefku

    I'm trying to figure out the difference of stars and round galaxies.

    So, star or galaxy? And why? ๐Ÿ˜ƒ

    1. AGZ0005v7h
    2. AGZ0004brl
    3. AGZ000610b

    Posted

  • ElisabethB by ElisabethB moderator

    All three are galaxies, because of the fuzziness ! ๐Ÿ˜„

    Posted

  • Capella05 by Capella05 moderator

    I have some chores to attend too, but I am sure I can have a look ๐Ÿ˜ƒ

    First one - AGZ0005v7h :

    AGZ0005v7h

    Without even looking at SkyServer, I will say galaxy. Can you see that the edges of the object are quite diffused? There is no clearly defined edge that we would expect to see with stars. Also none of the usual artifacts we tend to associate with stars.

    SkyServer also agrees - galaxy. In this case 2MASX J00464211+2942316.

    Posted

  • stefku by stefku

    ok, what about this one? AGZ00019t8

    And here are two next to each other: 587731511532060857. One is classified as star and one as galaxy. But IMHO both are fuzzy.

    Posted

  • Capella05 by Capella05 moderator

    Second up: AGZ0004BRL

    AGZ0004BRL

    Another galaxy. This one is more compact and the colouring could be associated with stars, but as Els pointed out it is fuzzy ๐Ÿ˜ƒ

    SkyServer agrees - galaxy

    Posted

  • Capella05 by Capella05 moderator

    Third up : AGZ000610B

    AGZ000610B

    Although this is also a galaxy- the colouring at the center could be confusing. We usually only see that colouring with foreground stars. It is usually caused by over saturation when bright objects get imaged.

    Posted

  • ElisabethB by ElisabethB moderator

    Here's the zoomed out view of AGZ00019t8

    this object is a star from our galaxy, but something went wrong with the imaging/filters. Classify as star artifact.

    enter image description here

    Posted

  • Capella05 by Capella05 moderator in response to stefku's comment.

    I will have a look, I was just getting the original ones out of the way. A lot of other volunteers will have the same questions ๐Ÿ˜ƒ

    Posted

  • stefku by stefku in response to ElisabethB's comment.

    Here's the zoomed out view of AGZ00019t8 this object is a star from
    our galaxy, but something went wrong with the imaging/filters.
    Classify as star artifact.

    @ElisabethB. Hm, that seems clear to me. How can I zoom out during classification?

    Posted

  • ElisabethB by ElisabethB moderator

    Sorry, you can't zoom out during classification, only after you've submitted your classification. But if you see this color, you can be sure that it is an artifact.

    Posted

  • ElisabethB by ElisabethB moderator

    The central one is a galaxy, the orange one is a foreground star. I can see what you mean with both of them being fuzzy, but the orange one is round and less fuzzy than the galaxy. ๐Ÿ˜„ Don't worry, it'll get easier if you see more and more images of galaxies and stars ! ๐Ÿ˜„

    enter image description here

    Posted

  • stefku by stefku in response to ElisabethB's comment.

    but the orange one is round and less fuzzy than the galaxy

    Ok, you mean the width of the fuzziness is thin. Can I assume that all borders of objects are kind of fuzzy on these images?

    Posted

  • ElisabethB by ElisabethB moderator

    Yes, this image has really big fuzziness issues ! ๐Ÿ˜„

    Posted