Not a bug

do not find some Gaia DR2 sources

FJ GG 10 months ago updated by Deborah Baines 10 months ago 1

I am searching for sources in ESASKy one by one using 'source_id' label.

There are some that, for whatever reason, it doesn't find them for me.

I find:

Gaia DR2 3347696388965946752

Gaia DR2 341867587319687808080

I do not find:

Gaia DR2 332351565654370895104

Gaia DR2 3335642026377082496

Gaia DR2 154466544592085888

Gaia DR2 3419692199896487680

Not a bug

Dear User,

ESASky displays the most recent Gaia Data Release catalogue, currently this is the gaia_source catalogue from Data Release 3 (DR3): https://www.cosmos.esa.int/web/esdc/esasky-catalogues#GAIA  

The Gaia documentation points out the following (see here, section 'Gaia source identifiers': https://www.cosmos.esa.int/web/gaia/dr3 ):

'[...] As explained in previous announcements, there are various reasons why the identifier of a specific source may change or disappear when going from the Gaia DR1 to the Gaia DR2 source list and on to the Gaia DR3 source list. Users of Gaia data should thus be aware that the source list for Gaia DR3 should be treated as independent from Gaia DR2 and from Gaia DR1. With each new Gaia data release, the source list is becoming progressively more stable. [...]' 

Therefore, you may be encountering this problem, you are trying to search for source identifiers in the DR2 gaia_source catalogue that no longer have the same identifier in the DR3 gaia_source catalogue.

I've gone to the Gaia archive (https://gea.esac.esa.int/archive/ ) and searched the Gaia DR2 gaia_source table for the 6 source_ids you provide and I can only find four of them, I do not find Gaia DR2 341867587319687808080 nor Gaia DR2 332351565654370895104. I used the following ADQL: 

SELECT source_id, ra, dec FROM gaiadr2.gaia_source
where source_id = 341867587319687808080

Or you can do this from the basic search form if you are not familiar with ADQL and the Gaia archive: https://gea.esac.esa.int/archive/#search

There is also a table in the Gaia archive called gaiaedr3.dr2_neighbourhood, that has both the Gaia DR2 and Gaia E/DR3 names. Looking at this table, and also the coordinates of the DR2 and DR3 sources, I believe the DR3 equivalent source_ids are these (again, I can not find the same two sources Gaia DR2 341867587319687808080 nor Gaia DR2 332351565654370895104) :

Gaia DR2 3347696388965946752 -> Gaia DR3 3347696388966821504

Gaia DR2 3335642026377082496 -> Gaia DR3 3335642030674836992

Gaia DR2 154466544592085888 -> Gaia DR3 154466544593135616

Gaia DR2 3419692199896487680 -> Gaia DR3 3419692204194118272

(I used the following ADQL: 

SELECT * FROM gaiaedr3.dr2_neighbourhood
where dr2_source_id = 3335642026377082496 


And I can confirm these four DR3 source ids are there in ESASky. 

If you need any help with the ESA Gaia archive, please check the FAQs (https://www.cosmos.esa.int/web/gaia-users/archive/faq) or contact our colleagues here: https://www.cosmos.esa.int/web/gaia/gaia-helpdesk

Please let us know if there is anything else we can help you with in ESASky and many thanks for using the tool!

Kind regards,

Deborah, on behalf of the ESASky team