Tus comentarios

Dear Casey,

We're happy to report that the issue has now been fixed and the Hubble and Webb images can again be viewed in ESASky!

This turned out to be a CORS issue with the CDN that has been fixed.

Many thanks for your patience and for reporting the issue to us.

Best regards,

Debbie on behalf of the ESASky team

Dear ESASky user,

The dotted lines indicate the direction of motion of the stars that have proper motion values in the Gaia DR3 catalogue. However, these dotted lines only change to the solid line when you zoom in enough to see the actual proper motion (or at least the position from epoch J2000 to J2016, the Gaia DR3 epoch). See these two screenshots as an example of zooming in on a star:

Image 116

Image 117

More information about this feature and the astrometric catalogues in ESASky can be found in the documentation here: https://www.cosmos.esa.int/web/esdc/esasky-interface#datapanel

I hope this answers your question and we hope you're finding ESASky useful.

Best regards,


Dear Becky,

Thank you for your message. Please note that these outreach images are created by the HST mission for outreach purposes, and their astrometry will therefore sometimes not be as precise as Gaia. We will pass this information on to the Hubble Outreach team and see if there is anything that can be done to improve the astrometry of the images within ESASky. 

Kind regards,

Debbie, on behalf of the ESASky team


I'm afraid I can't reproduce the issue you are having with the Publications feature, I'm trying in the region you gave GAL 223.5904988 -08.6562613 with almost the same field of view: 9.6° X 4.8° (see image below). Perhaps you experienced a connection error between ESASky and the service we use to collect the publication data? Can you try again and if you're still having this issue, please provide us with a few more details (your operating system and the browsers you are trying).:

Image 114

Regarding the blue shadows you see in the background image, these are indeed instrumental. The colour image you see in the background of ESASky comes from the second Digitized Sky Survey (DSS2), which is a digitized version of several photographic ground-based surveys of the sky, produced by the Space Telescope Science Institute between 1983 and 2006. The colour background (HiPS) in ESASky was created by the Strasboug astronomical Data Center (CDS) by combining the three DSS2 filters in the red, blue and infrared. What you're seeing here looks like a reflection of part of the telescope instrumentation in the blue filter images. 

Another user had a similar question about a different strange artifact in the same background sky, which might help answer your question: https://esdc.userecho.com/communities/1/topics/222-curious-as-to-what-this-is

Many thanks for contacting us and for using ESASky!

Kind regards,

Deborah on behalf of the ESASky team


You can do this by right clicking in the sky (or press and hold if you are using a tablet or mobile) and a window appears with the coordinates and 5 icons: 

Image 113

If you click on the SIMBAD or the NED icon, you will be taken to these tools and shown a list of objects that are in the region and how far away these objects lie from your cursor position. More information about this feature can be found here: 


I hope this helps and many thanks for using ESASky.

Kind regards,

Debbie on behalf of the ESASky team


Many thanks for your message. Unfortunately the machines used to create the background skies (HiPS) were being upgraded last week and it took longer than expected, and all HiPS updates were on hold (including the M42 region). 

The updating of all HiPS has been restarted again and these images will be generated and visible soon in ESASky. Sorry for the inconvenience.

Many thanks for contacting us and for using ESASky.

Best regards,

Debbie, on behalf of the ESASky team

Dear Richard,

Many thanks for your message. Yes, it seems the outreach image functionality (where ESASky displays the entire image and goes to the centre of the image) is overruling the field of view and coordinate information. 

We'll work on solving this issue and let you know when it's fixed. 

Kind regards,

Debbie on behalf of the ESASky team

Dear Becky,

We're pleased to tell you we've added this functionality to ESASky

Image 109

Dear Millennium Twain,

From what I understand, this is a very large catalogue that you'd like to view in ESASky, and to possibly filter for certain types of objects? 

I'm happy to tell you that ESASky now provides access to VizieR and the 4 versions of the Milliquas catalogue are appearing in ESASky. When I search in VizieR, the latest version of the catalogue appears to be: The Million Quasars (Milliquas) catalogue, version 7.2 (Flesch, 2021); the VII/290/catalog, and I can find it and load it in ESASky by doing the following:

  • Click on the 5th icon in the top left (when hovering it says 'Explore data from external data centres in this region')
  • Click on the 'VizieR' tab
  • In the search field, search for 'Flesch' or even better, search for 'VII/290/catalog'
  • Open the 'VII_nonstellar' tree
  • If you want to load sources within the field of view displayed in ESASky, toggle on the 'FoV restricted' button in the top right of the External Data Centres window and then select the first icon on the left of the catalogue, in the Open column (when hovered over it says 'open table'). 
  • By toggling off the 'FoV restricted' button you will load the whole table, however, please note this is limited to 10,000 sources so as not to overload the browser. What you can next do is filter the query for quasars, for example, by filtering the 'Type' column in the catalogue. You can do this using the ADQL functionality within ESASky (select the 3rd icon in the Query column (when hovered over it says 'create a custom ADQL query'). And you can type something like the following (and see the image below): 

SELECT TOP 10000 * FROM "VII/290/catalog"

WHERE 1=CONTAINS( POINT('ICRS', RAJ2000, DEJ2000), CIRCLE('ICRS', 235.65,10.0, 10.0))

AND Type = 'Q'

The above ADQL code brings back the first 10000 rows (TOP 10000) and all columns (*) from the VII/290 catalogue (FROM "VII/290/catalog") centred at coordinates RA=235.65, DEC = 10.0 and a radius of 10.0 degrees (2nd line) and also only selecting Quasars (Type = 'Q'). 

Image 108

Note, this type of query is still restricted to returning 10000 objects in the sky (even if you remove TOP 10000). Let us know if you need to visualise more objects in the sky or the type of use case you are trying to do. 

To find out more about this functionality and about ADQL commands, please read our help pages here: https://www.cosmos.esa.int/web/esdc/esasky-interface#EXTTAP

I hope all this helps.

Best regards,

Deborah, on behalf of the ESASky team

Dear Andy,

We've released the latest version of ESASky today and I'm happy to say we've fixed the bug you reported to us. Proper motion columns are correct again:

Image 107


Many thanks for reporting this to us!

Best regards,

Debbie on behalf of the ESASky team