ARI katkat is a catalog of star catalogues
in the spirit of G. Teleki's catalog of star catalogs
(`1989BOBeo.140..131T`_ and references in there). It contains
2573 catalogs suitable for astrometric usage, starting with Flamsteed
(1835) and ending in the 1970ies. For almost all of them, there
is a column description file (as PDF, and unfortunately sometimes in
German) and the digitized content.
.. _1989BOBeo.140..131T: http://ads.g-vo.org/abs/1989BOBeo.140..131T
ARI's "Geschichte des Fixsternhimmels" is an attempt to collect all
astrometrically useful observations from before ca. 1970 in a way
comparable to what has been done to construct the FK* series of
fundamental catalogs. About 7e6 published positions are included.
In GAVO's DC, we provide tables of identified and non-identified stars
together with the master catalog that objects were identified against.
ARI's "Geschichte des Fixsternhimmels" is an attempt to collect all
astrometrically useful observations from before ca. 1970 in a way
comparable to what has been done to construct the FK* series of
fundamental catalogs. About 7e6 published positions are included.
In GAVO's DC, we provide tables of identified and non-identified stars
together with the master catalog that objects were identified against.
The catalogue ARIHIP has been constructed by selecting the 'best
data' for a given star from combinations of HIPPARCOS data with Boss'
GC and/or the Tycho-2 catalogue as well as the FK6. It provides 'best
data' for 90 842 stars with a typical mean error of 0.89 mas/year
(about a factor of 1.3 better than Hipparcos for this sample of
stars).
This is a course on the Virtual Observatory's main query language
ADQL (short for Astronomical Data Query Language), which is a SQL
dialect standardised so users do not have to learn new languages each
time they want to use a new resource. We also introduce the basic
aspects of the Table Access Protocol TAP, which transports ADQL
queries, their results as well as the metadata necessary to write
meaningful queries.
The course comes with many exercises, most of which also have
solutions. We hope it is suitable for both self-study and as lecture
notes in teacher-led situations.
This is a course on pyVO, an astropy-affiliated Python library
implementing client parts for many protocols in the Virtual
Observatory: Simple discovery protocols like SCS, SIAP, and SSAP as
well as the sophisticated Table Access Protocol TAP, which allows
users to send complex queries to remote tables and retrieve
metadata-rich results. There is also an interface to the VO Registry
to enable data and service discovery.
The course comes with many exercises, most of which also have
solutions. We hope it is suitable for both self-study and as lecture
notes in teacher-led situations.
In this tutorial you will learn about asteroids, a very interesting
and current topic in our exploration of the Solar System and of
planetary formation. You will learn about their orbital
characteristics by querying a database.
Intermediate computer skills are recommended, as the tutorial requires
the (guided) query of online electronic databases and use of
histograms.
The VO client Aladin offers powerful facilities of creating an
astrometrical calibration to images lacking WCS (World Coordinate
System) information. This tutorial shows how to go about doing this
for an image of the Ring Nebula in Lyr.
Astrometric Microlensing Events Predicted from Gaia DR2
Short Name:
am lensing 2
Date:
27 Dec 2024 08:31:01
Publisher:
The GAVO DC team
Description:
From the Gaia DR2 catalogue we predict astrometric microlensing
events by foreground stars with high proper motion (µ_tot >150mas/yr)
passing a background source in the next decades. Using Gaia DR2
photometry we determine an approximate mass of the lens, which we use
to calculate the expected microlensing effects. This yields 3914
microlensing events by 2875 different lenses between 2010 and 2065
with expected shifts larger than 0.1 mas between the lensed and
unlensed positions of the source. 513 of those are expected to happen
between 2014.5 - 2026.5 and might be measured by Gaia. For 127 events
we also expect a magnification between 1 mmag and 3 mag.
Astrometric Microlensing Events Predicted from Gaia eDR3
Short Name:
am lensing 2
Date:
27 Dec 2024 08:31:05
Publisher:
The GAVO DC team
Description:
From the Gaia eDR3 catalogue we predict astrometric microlensing
events by foreground stars with high proper motion (μ > 100 mas/yr)
passing a background source in the next decades. Using Gaia DR3
photometry we determine an approximate mass of the lens, which we use
to calculate the expected microlensing effects. This yields 4842
microlensing events by 3791 different lenses between 2010 and 2066
with expected shifts larger than 0.1 mas between the lensed and
unlensed positions of the source. The past events might be interested
when analyzing the individual Gaia measurements). 685 of those are
expected to happen within the next decade (2021-2031). For 140 events
we also expect a magnification between 1 mmag and 0.6 mag.
![To the extent possible under law, the publisher has waived all copyright and related or neighboring rights to GAVO's ADQL course. For details, see the `Creative Commons CC0 1.0 Public Domain dedication <http://creativecommons.org/publicdomain/zero/1.0/>`_. Of course, you should still give proper credit when using this data as required by good scientific practice. .. image:: /static/img/cc0.png :alt: [CC0]](/registry-search/?f%5Bpublisher_facet_trim%5D%5B%5D=The+GAVO+DC+team&f%5Brights_facet%5D%5B%5D=To+the+extent+possible+under+law%2C+the+publisher+has+waived+all+copyright+and+related+or+neighboring+rights+to+GAVO%27s+ADQL+course.++For+details%2C+see+the+%60Creative+Commons+CC0+1.0+Public+Domain+dedication+%3Chttp%3A%2F%2Fcreativecommons.org%2Fpublicdomain%2Fzero%2F1.0%2F%3E%60_.++Of+course%2C+you+should+still+give+proper+credit+when+using+this+data+as+required+by+good+scientific+practice.%0A%0A..+image%3A%3A+%2Fstatic%2Fimg%2Fcc0.png%0A+++%3Aalt%3A+%5BCC0%5D%0A%0A){kind=link}