September 25, 2020 - this database is named!
On the user request and to simplify the usage and quoting we decided to name our database. From now on it will be named: StePPeD. This do not change the version number, it is still 2.3
July 27, 2020 - version 2.3 released as a result of adding 6 new stars.
As a result of analyzing two papers:
- Bobylev & Bajkova, 2020 ( bibcode: 2020arXiv200616555B )
- R. Darma et al 2019 J. Phys.: Conf. Ser. 1245 012028
we added six new stars to our database. These are:
Gaia DR2 3130033734235815424 as P0036
Gaia DR2 969867803725057920 as P0442
Gaia DR2 365942724131566208 as P0753
Gaia DR2 3863292438160881792 as P0754
Gaia DR2 3106503768787702528 as P0755
Gaia DR2 3423180542272114688 as P0756
Our database now consists of 825 potential perturbers i.e. 787 single stars and 38 multiple systems. Among them 648 objects might pass the Sun closer than 4 pc. All relevant results were recalculated and files available for download were updated.
July 20, 2020 - small upgrades of the database interface.
Added were lists of our objects by their identifiers in various catalogues. Several small interface errors were corrected.
May 2, 2020 - two objects merged into one multiple perturber, version 2.2
During several careful checks we found that objects P0209 and P0442 are components of the double system WDS J07002+4259. As a result we renamed these objects as P0209-A and P0209-B respectively and redefined the perturber P0209 as a double star object. Object P0442 has been deleted. All tables and results have been updated accordingly. Now we have 819 perturbers in our database and 642 of them can nominally approach the Sun closer that 4 pc.
April 17, 2020 - additional download, version 2.1
On the user request we added the third file available for download: a complete dump of all input data for all 852 singular objects in the database, i.e. positions, proper motions, radial velocities, parallaxes as well as the mass and heliocentric distance estimations. For all values both uncertainties (where available) and sources are also included. See our download section.
April 10, 2020 - release of version 2.0
- The main change is connected with the star distance calculation method. Instead of simply using an inverse of a parallax we decided to rely on the results of a paper: Estimating Distance from Parallaxes. IV. Distances to 1.33 Billion Stars in Gaia Data Release 2 by Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Mantelet, G.; Andrae, R. (The Astronomical Journal, Volume 156, Issue 2, article id. 58, 11 pp., 2018).
- We have also changed all input data for an object P0403 (WISE J072003.20-084651.2) according to the latest paper devoted to it: WISE J072003.20-084651.2B is a Massive T Dwarf by Dupuy et al. (The Astronomical Journal, Volume 158, Issue 5, article id. 174, 14 pp., 2019)
March 5, 2020 - Initial release.
- This was accompanied with the release of the first version of an announcing paper: A surprise in the updated list of stellar perturbers of long period comets motion by Rita Wysoczańska, Piotr A. Dybczyński, and Magdalena Polińska.