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This page describes recent changes and additions to the PS1 inte=
rfaces, services, and documentation.
A new Python Jupyter notebook has been written to search PS1 images and = catalogs that have observations of a moving solar system target. In a= bout one minute, the notebook finds all PS1 observations that included a pa= rticular target and extracts cutout images and catalog measurements. = See the How to search for moving targets in PS1 images and = catalogs page for details.
The astrometry in PS1 has been updated using Gaia EDR3. Systematic= astrometric distortions and color terms (from differential chromatic aberr= ation) are greatly reduced. It is still possible to access the old po= sitions, but the new astrometry is preferred for most purposes. See PS1 Astro= metry Correction Using Gaia EDR3 for more details.
A Python script that does faster bulk c= utout image downloads from a list of RA and Dec positions has been adde= d to the PS1 Image = Cutout Service page.
PS1 has a Virtual Observatory-compatible Table Access Protocol (TAP) int= erface for the PS1 database. It provides an alternative to CasJobs fo= r SQL queries of the database. See the How to retrieve and use PS1 data page= for additional information, including a link to a Python Jupyter notebook.=
The PS1 DR2 caveats p= age's description of sky regions with missing data in the PS1 database has = been updated. Currently about 4.9 square degrees (only 0.016%) of the= sky has missing objects. That is substantially reduced from the miss= ing area at the time of the DR2 release.
A new web page, Easy cross-match with PS1 using a list of= source positions, shows that it is very simple to cross-match a list o= f positions to the PS1 catalog using a single curl command or a simple Pyth= on script.
The For= cedMeanObject, ForcedMeanLensing, and ForcedMeanObjectView tables are now avai= lable in the DR2 database.
The PanSTARRS Data Release 2 (DR2) was opened to the public on 2019 Janu= ary 28. The release includes a new database with the multi-epoc= h photometry and astrometry (typically there are 60 epochs of observation o= ver 3 years from the 5 PS1 filters). It also includes access to the s= ingle-epoch "warp" image= s. The mean and stack measurements are still available, and the DR1 c= atalog remains available as well for ongoing research projects. The 1= 50 terabyte database together with 1.5 petabytes of images comprise the lar= gest single astronomical survey data release to date (to our knowledge).
There are multiple new interfaces available for the catalogs and images.= The new MAST PS1 user interface is a simple web form = that provides fast access to the data along with numerous customization opt= ions. The associated MAST API enabl= es straightforward programmatic access from languages such as Python.
The images are available via both the PS1 Image Cutout Service and the MAST Portal.&nbs= p; Both services are also accessible via programmatic interfaces.
Finally, the MAST CasJobs interface provides direct S= QL query access to the very large database. We have also provided a n= ew Python Jupyter notebook that shows how to ex= ecute CasJobs queries from Python.
See How = to retrieve and use PS1 data for more information and for links to Pyth= on. Also, see the PS1 = DR2 caveats for warnings about minor issues associated with the DR2 dat= abase and images.
A simple Python script that shows how to dete= rmine what images are available at a sky position and how to retrieve the i= mages (in FITS or JPEG/PNG format) has been added to the PS1 Image Cutout Service web page= .
A new version of the CasJobs PanSTARRS_DR1 database has been installed. = This adds mean measurements for about 0.1% of objects that were missi= ng in the 2017 Feb 2 release to the MeanObject table. The objects add= ed are near declination =3D +30 degrees. For users who have done larg= e-scale queries and want to get just the new objects, there is a new table = to make this easier. MeanObjectMissing_03172017 has 14 million = objects that were previously missing from MeanObject. It should be po= ssible to run most queries that used MeanObject again using this much small= er table to quickly fill in missing data.
The new database replaces the old one since it is preferred for all purp= oses. Existing objects in the database did not change in any way. &nb= sp;This version of the database is thought to be complete over the sky.
A new version of the CasJobs PanSTARRS_DR1 database has been installed. = This adds about 1.5% of objects that were missing in the 2016 Dec 19 = release of ObjectThin, MeanObject, and StackObjectThin tables. For us= ers who have done large-scale queries and want to get just the new objects,= there are 3 new tables to make this easier. ObjectThinMissing = has 132 million objects that were previously missing from ObjectThin; MeanO= bjectMissing has the same 132 million objects that were missing from MeanOb= ject; and StackObjectThinMissing has 40 million objects that were missing f= rom StackObjectThin. It should be possible to run most queries again = using these much smaller tables to quickly fill in missing data.
The new database replaces the old one since it is preferred for all purp= oses. Existing objects in the database did not change in any way.
There is still a very small number of missing objects (about 0.01%) that= are missing near declination =3D +30 degrees. Currently we do not ex= pect those objects to be filled in before the DR2 data release (which will = include all the multi-epoch PS1 photometry).
The MAST Data Discovery Portal now includes an option to show a PS1 = image as the background in the sky viewer that shows the search results. &n= bsp;See an article in the F= ebruary 2017 MAST Newsletter for more details.
A new PS1 documentation page describing PS1 DR1 caveats was added. It highlights some quir= ks in the PS1 DR1 data.
A new PS1 documentation page describing how to separate stars and galaxies= a> was added.
Due to heavy demand, we are limiting the size of the allowed search radi= us in the catalog search form. Currently search radii must b= e less than 0.5 degrees for standard single-position searches and less than= 0.02 degrees for file upload queries.
A bug was introduced in the catalog search form = ;at about 5pm EST on Tuesday 2016 December 20. The bug prevented any = PS1 searches from running. It was fixed the morning of 2016 December 21.
The Pan-STARRS1 archive Data Release 1 (DR1) was opened to the public at= 8am EST on 2016 December 19.