What is a blue object?

Simbad says these object is a Blue Object. What is a Blue Object?
RA,Dec = 31.7174, -6.6799
https://www.legacysurvey.org/viewer?ra=31.7174&dec=-6.6799&layer=decals-dr5&zoom=15
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it’s a Optical-UV source, but it could be a blue pea. a distant starburst galaxy up to a few billion ly away.

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The object in your image isn’t actually the simbad blue object. It’s almost an arcminute away.

Blue objects can be a few things. I usually see hot subdwarfs with that simbad designation.

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https://www.legacysurvey.org/viewer?ra=31.7062&dec=-6.6711&layer=decals-dr5&zoom=15
Here is your blue object.
A reference says it is a quasar candidate

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