# Query a region but only return objects satisfying a given condition

**URL:** <https://community.openastronomy.org/t/query-a-region-but-only-return-objects-satisfying-a-given-condition/536>\
**Category:** Astropy\
**Tags:** astropy\
**Created:** [December 6, 2022, 7:02pm UTC](https://community.openastronomy.org/t/query-a-region-but-only-return-objects-satisfying-a-given-condition/536 "2022-12-06T19:02:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![crum](https://avatars.discourse-cdn.com/v4/letter/c/8797f3/32.png) [@crum](https://community.openastronomy.org/u/crum)\
**Post date:** [December 6, 2022, 7:02pm UTC](https://community.openastronomy.org/t/query-a-region-but-only-return-objects-satisfying-a-given-condition/536/1 "2022-12-06T19:02:16Z")

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Is it possible to use astroquery to query a region of the sky but only return objects satisfying a certain condition, such as having an apparent magnitude less than a certain value? I’m trying to get a table of the 100 brightest objects in my night sky. Would love any advice! Thanks.

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**Author:** ![trjaffe](https://dub1.discourse-cdn.com/flex005/user_avatar/community.openastronomy.org/trjaffe/32/202_2.png) [@trjaffe](https://community.openastronomy.org/u/trjaffe)\
**Post date:** [December 13, 2022, 12:53pm UTC](https://community.openastronomy.org/t/query-a-region-but-only-return-objects-satisfying-a-given-condition/536/2 "2022-12-13T12:53:51Z")

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I don’t know about astroquery, but you can do it with pyvo following the example in section 2.3 of this tutorial: [Accessing astronomical catalogs — NASA-NAVO Workshops Notebooks](https://nasa-navo.github.io/navo-workshop/CS_Catalog_Queries.html)