@article{UBHD-67798403,
  author={Brosche, Peter and Lenhardt, Helmut},
  title={Die Polbewegung aus den Beobachtungen von F. W. Bessel 1842 - 1844},
  year={2011},
  pages={329-337},
  language={ger},
  issn={1618-8950},
  volume={136},
  number={6},
  journal={ZfV},
}
@incollection{UBHD-68184552,
  author={Fabricius, Claus and Bastian, Ulrich and Biermann, Michael and L{\"o}ffler, Wolfgang and Br{\"u}semeister, Thomas and Hauser, Marcus and Jordan, Stefan and Lenhardt, Helmut and Stampa, Ulrike and Altmann, Martin and Hofmann, Wilfried},
  title={Gaia data release 1},
  subtitle={pre-processing and source list creation},
  year={2016},
  pages={21 S.},
  language={eng},
  note={Gesehen am 27.10.2017},
  booktitle={Arxiv},
}
@article{UBHD-68575755,
  author={Fabricius, Claus and Bastian, Ulrich and Biermann, Michael and L{\"o}ffler, Wolfgang and Br{\"u}semeister, Thomas and Hauser, Marcus and Jordan, Stefan and Lenhardt, Helmut and Stampa, Ulrike and Altmann, Martin and Hofmann, Wilfried},
  title={Gaia data release 1},
  subtitle={pre-processing and source list creation},
  year={2016},
  pages={21 S.},
  language={eng},
  issn={1432-0746},
  volume={595(2016) Artikel-Nummer A3},
  number={21 Seiten},
  note={Gesehen am 12.05.2020},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201628643},
}
@article{UBHD-68360898,
  author={Mignard, François and Bastian, Ulrich and Biermann, Michael and Gracia-Abril, Gonzalo and Jordan, Stefan and L{\"o}ffler, Wolfgang and Hauser, Marcus and Hofmann, Wilfried and Lenhardt, Helmut and Mantelet, Grégory and Sagristà Sellés, Antoni and Altmann, Martin and Stampa, Ulrike and Br{\"u}semeister, Thomas},
  organization={Gaia collaboration},
  title={Gaia data release 2},
  subtitle={The celestial reference frame (Gaia-CRF2)},
  year={2018},
  pages={15 S.},
  language={eng},
  issn={1432-0746},
  volume={616(2018) Artikel-Nummer A144},
  number={15 Seiten},
  note={Gesehen am 21.02.2019},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201832916},
}
@article{UBHD-68361229,
  author={Helmi, Amina and Bastian, Ulrich and Biermann, Michael and Gracia-Abril, Gonzalo and Altmann, Martin and Jordan, Stefan and L{\"o}ffler, Wolfgang and Br{\"u}semeister, Thomas and Lenhardt, Helmut and Mantelet, Grégory and Sagristà Sellés, Antoni and Stampa, Ulrike},
  organization={Gaia collaboration},
  title={Gaia data release 2},
  subtitle={Kinematics of globular clusters and dwarf galaxies around the Milky Way},
  year={2018},
  pages={47 S.},
  language={eng},
  issn={1432-0746},
  volume={616(2018) Artikel-Nummer A12},
  number={47 Seiten},
  note={Gesehen am 22.02.2019},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201832698},
}
@article{UBHD-68364332,
  author={Katz, David A. and Biermann, Michael and Bastian, Ulrich and Gracia-Abril, Gonzalo and Altmann, Martin and Jordan, Stefan and L{\"o}ffler, Wolfgang and Br{\"u}semeister, Thomas and Hauser, Marcus and Hofmann, Wilfried and Mantelet, Grégory and Sagristà Sellés, Antoni and Lenhardt, Helmut and Stampa, Ulrike},
  organization={Gaia collaboration},
  title={Gaia data release 2},
  subtitle={mapping the Milky Way disc kinematics},
  year={2018},
  pages={40 S.},
  language={eng},
  issn={1432-0746},
  volume={616(2018) Artikel-Nummer A11},
  number={40 Seiten},
  note={Gesehen am 28.02.2019},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201832865},
}
@article{UBHD-68364340,
  author={Brown, Anthony G. A. and Biermann, Michael and Bastian, Ulrich and Gracia-Abril, Gonzalo and Altmann, Martin and Jordan, Stefan and L{\"o}ffler, Wolfgang and Br{\"u}semeister, Thomas and Hauser, Marcus and Hofmann, Wilfried and Lenhardt, Helmut and Mantelet, Grégory and Sagristà Sellés, Antoni and Stampa, Ulrike},
  organization={Gaia collaboration},
  title={Gaia data release 2},
  subtitle={Summary of the contents and survey properties},
  year={2018},
  pages={22 S.},
  language={eng},
  issn={1432-0746},
  volume={616(2018) Artikel-Nummer A1},
  number={22 Seiten},
  note={Gesehen am 28.02.2019},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201833051},
}
@article{UBHD-68365735,
  author={Spoto, Federica and Biermann, Michael and Bastian, Ulrich and Gracia-Abril, Gonzalo and Altmann, Martin and Jordan, Stefan and L{\"o}ffler, Wolfgang and Br{\"u}semeister, Thomas and Hauser, Marcus and Hofmann, Wilfried and Lenhardt, Helmut and Mantelet, Grégory and Sagristà Sellés, Antoni and Stampa, Ulrike},
  organization={Gaia collaboration},
  title={Gaia data release 2},
  subtitle={Observations of solar system objects},
  year={2018},
  pages={24 S.},
  language={eng},
  issn={1432-0746},
  volume={616(2018) Artikel-Nummer A13},
  number={24 Seiten},
  note={Gesehen am 05.03.2019},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201832900},
}
@article{UBHD-68365739,
  author={Babusiaux, Carine and Biermann, Michael and Bastian, Ulrich and Gracia-Abril, Gonzalo and Altmann, Martin and Jordan, Stefan and L{\"o}ffler, Wolfgang and Br{\"u}semeister, Thomas and Hauser, Marcus and Hofmann, Wilfried and Lenhardt, Helmut and Mantelet, Grégory and Sagristà Sellés, Antoni and Stampa, Ulrike},
  organization={Gaia collaboration},
  title={Gaia data release 2},
  subtitle={Observational Hertzsprung-Russell diagrams},
  year={2018},
  pages={29 S.},
  language={eng},
  issn={1432-0746},
  volume={616(2018) Artikel-Nummer A10},
  number={29 Seiten},
  note={Gesehen am 05.03.2019},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201832843},
}
@article{UBHD-68384808,
  author={Eyer, Laurent and Biermann, Michael and Bastian, Ulrich and Gracia-Abril, Gonzalo and Altmann, Martin and Jordan, Stefan and L{\"o}ffler, Wolfgang and Br{\"u}semeister, Thomas and Hauser, Marcus and Hofmann, Wilfried and Lenhardt, Helmut and Sagristà Sellés, Antoni and Stampa, Ulrike},
  organization={Gaia collaboration},
  title={Gaia Data Release 2},
  subtitle={variable stars in the colour-absolute magnitude diagram},
  year={2019},
  pages={20 S.},
  language={eng},
  issn={1432-0746},
  volume={623(2019) Artikel-Nummer A110},
  number={20 Seiten},
  note={Gaia Collaboration, L. Eyer, L. Rimoldini, M. Audard, R.I. Anderson, K. Nienartowicz, F. Glass, O. Marchal, M. Grenon, N. Mowlavi, B. Holl, G. Clementini, C. Aerts, T. Mazeh, D.W. Evans, L. Szabados, A.G.A. Brown, A. Vallenari, T. Prusti, J.H.J. de Bruijne, C. Babusiaux [und weitere] ; Gesehen am 06.05.2019},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201833304},
}
@article{UBHD-68295275,
  author={Clementini, Gisella and Bastian, Ulrich and Biermann, Michael and Grebel, Eva K. and Els, Sebastian and Mercier, Emmanuel and Altmann, Martin and Hauser, Marcus and Jordan, Stefan and Br{\"u}semeister, Thomas and Hofmann, Wilfried and Lenhardt, Helmut and L{\"o}ffler, Wolfgang and Mantelet, Grégory and Sagristà Sellés, Antoni and Stampa, Ulrike and Bernstein, Hans-Heinrich},
  organization={Gaia collaboration},
  title={Gaia Data Release 1 - testing parallaxes with local Cepheids and RR Lyrae stars},
  year={2017},
  pages={29 S.},
  language={eng},
  issn={1432-0746},
  volume={605(2017) Artikel-Nummer A79},
  number={29 Seiten},
  note={Gesehen am 14.08.2018},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201629925},
}
@article{UBHD-68162208,
  author={Leeuwen, Floor van and Bastian, Ulrich and Biermann, Michael and Grebel, Eva K. and Els, Sebastian and Altmann, Martin and Hauser, Marcus and Jordan, Stefan and Hofmann, Wilfried and Lenhardt, Helmut and Mantelet, Grégory},
  organization={Gaia collaboration},
  title={Gaia data release 1 - open cluster astrometry},
  subtitle={performance, limitations, and future prospects},
  year={2017},
  pages={65 S.},
  language={eng},
  issn={1432-0746},
  volume={601(2017) Artikel-Nummer A19},
  number={65 Seiten},
  note={Gesehen am 05.09.2017},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201730552},
}
@article{UBHD-68583291,
  author={Brown, Anthony G. A. and Bastian, Ulrich and Biermann, Michael and Grebel, Eva K. and Els, Sebastian and Mercier, Emmanuel and Altmann, Martin and Hauser, Marcus and Jordan, Stefan and Br{\"u}semeister, Thomas and Hofmann, Wilfried and Lenhardt, Helmut and L{\"o}ffler, Wolfgang and Mantelet, Grégory and Sagristà Sellés, Antoni and Stampa, Ulrike and Bernstein, Hans-Heinrich},
  organization={Gaia collaboration},
  title={Gaia Data Release 1},
  subtitle={summary of the astrometric, photometric, and survey properties},
  year={2016},
  pages={23 S.},
  language={eng},
  issn={1432-0746},
  volume={595(2016},
  note={Gesehen am 03.06.2020},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201629512},
}
@article{UBHD-68184894,
  author={Prusti, Timo and Bastian, Ulrich and Biermann, Michael and Grebel, Eva K. and Altmann, Martin and Hauser, Marcus and Jordan, Stefan and Br{\"u}semeister, Thomas and Hofmann, Wilfried and Lenhardt, Helmut and L{\"o}ffler, Wolfgang and Mantelet, Grégory and Sagristà Sellés, Antoni and Stampa, Ulrike},
  organization={Gaia collaboration},
  title={The Gaia mission},
  year={2016},
  pages={36 S.},
  language={eng},
  issn={1432-0746},
  volume={595(2016) Artikel-Nummer A1},
  number={36 Seiten},
  note={Gesehen am 30.10.2017},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201629272},
}
@incollection{UBHD-68022419,
  author={Jordan, Stefan and Bastian, Ulrich and Lenhardt, Helmut and Biermann, Michael},
  title={Gaia first look},
  year={2004},
  pages={?},
  language={eng},
  note={Gesehen am 29.08.2016},
  booktitle={De.arxiv.org},
}
@article{UBHD-67498877,
  author={Kovalevsky, Jean and Walter, Hans G. and Hering, Roland and R{\"o}ser, Siegfried and Wielen, Roland and Bernstein, Hans-Heinrich and Lenhardt, Helmut},
  title={The FAST Hipparcos data reduction consortium},
  subtitle={overview of the adopted reduction software},
  year={1992},
  pages={7-17},
  language={eng},
  issn={1432-0746},
  volume={258},
  note={Gesehen am 18.11.2013},
  journal={Astronomy and astrophysics},
}
@incollection{UBHD-68181423,
  author={Leeuwen, Floor van and Bastian, Ulrich and Biermann, Michael and Grebel, Eva K. and Els, Sebastian and Altmann, Martin and Hauser, Marcus and Jordan, Stefan and Hofmann, Wilfried and Lenhardt, Helmut and Mantelet, Grégory},
  title={Gaia data release 1 - open cluster astrometry},
  subtitle={performance, limitations, and future prospects},
  year={2017},
  pages={8 S.},
  language={eng},
  note={Gesehen am 20.10.2017},
  booktitle={De.arxiv.org},
}
@book{UBHD-68296907,
  author={Lenhardt, Helmut},
  title={Zur Energie der Chandler Polschwankung},
  publisher={Beck [in Komm.]},
  address={M{\"u}nchen},
  year={1990},
  pages={87 S.},
  language={ger},
  isbn={3-7696-9408-2 and 978-3-7696-9408-6},
  number={ARRAY(0x5636813c33b8)},
  series={Deutsche Geod{\"a}tische Kommission der Bayerischen Akademie der Wissenschaften},
  school={Zugl.: Darmstadt, Techn. Hochsch., Diss., 1990},
  keywords={Chandler-Periode / Energie},
}
@article{UBHD-68364327,
  author={Lindegren, Lennart and Bastian, Ulrich and Biermann, Michael and Stampa, Ulrike and Altmann, Martin and Br{\"u}semeister, Thomas and Hauser, Marcus and Hofmann, Wilfried and Jordan, Stefan and Lenhardt, Helmut and L{\"o}ffler, Wolfgang},
  title={Gaia data release 2},
  subtitle={The astrometric solution},
  year={2018},
  pages={25 S.},
  language={eng},
  issn={1432-0746},
  volume={616(2018) Artikel-Nummer A2},
  number={25 Seiten},
  note={Gesehen am 28.02.2019},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/201832727},
}
@incollection{UBHD-68184548,
  author={Lindegren, Lennart and Bastian, Ulrich and Altmann, Martin and Biermann, Michael and Br{\"u}semeister, Thomas and Hauser, Marcus and Jordan, Stefan and Lenhardt, Helmut and L{\"o}ffler, Wolfgang and Stampa, Ulrike},
  title={Gaia data release 1},
  subtitle={astrometry - one billion positions, two million proper motions and parallaxes},
  year={2016},
  language={eng},
  note={Gesehen am 27.10.2017},
  booktitle={Arxiv},
  doi={10.1051/0004-6361/201628714},
}
@article{UBHD-67498878,
  author={Walter, Hans G. and Bernstein, Hans-Heinrich and Hering, Roland and Lenhardt, Helmut and Wielen, Roland},
  title={Preliminary FAST results on astrometric parameters},
  year={1992},
  pages={4171},
  language={eng},
  volume={9},
  journal={Highlights of astronomy},
}
@article{UBHD-67489569,
  author={Wielen, Roland and Lenhardt, Helmut and Schwan, Heiner and Dettbarn, Christian},
  title={The combination of ground-based astrometric compilation catalogues with the HIPPARCOS catalogue},
  subtitle={I. Single-star mode},
  year={1999},
  pages={1046-1054},
  language={eng},
  issn={1432-0746},
  volume={347},
  number={?},
  note={Gesehen am 29.10.2013},
  journal={Astronomy and astrophysics},
}
@incollection{UBHD-67489571,
  author={Wielen, Roland and Schwan, Heiner and Dettbarn, Christian and Jahreiß, Hartmut and Lenhardt, Helmut},
  title={The combination of HIPPARCOS data with ground-based astrometric measurements},
  year={1999},
  pages={161-170},
  language={eng},
  isbn={3-7001-2774-X and 978-3-7001-2774-1},
  booktitle={Modern astrometry and astrodynamics},
  editor={Dvorak, Rudolf},
}
@article{UBHD-67489567,
  author={Wielen, Roland and Dettbarn, Christian and Jahreiß, Hartmut and Lenhardt, Helmut and Schwan, Heiner},
  title={Indications on the binary nature of individual stars derived from a comparison of their HIPPARCOS proper motions with ground-based data},
  subtitle={I. Basic principles},
  year={1999},
  pages={675-685},
  language={eng},
  issn={1432-0746},
  volume={346},
  number={?},
  note={Gesehen am 29.10.2013},
  journal={Astronomy and astrophysics},
}
@conference{UBHD-67489570,
  author={Wielen, Roland and Schwan, Heiner and Dettbarn, Christian and Jahreiß, Hartmut and Lenhardt, Helmut},
  title={The sixth catalogue of fundamental stars (FK6) and the problem of double stars},
  year={1998},
  pages={123-132},
  language={eng},
  isbn={3-8171-1588-1 and 978-3-8171-1588-4},
}
@conference{UBHD-67495789,
  author={Wielen, Roland and Schwan, Heiner and Dettbarn, Christian and Jahreiß, Hartmut and Lenhardt, Helmut},
  title={Statistical astrometry based on a comparison of individual proper motions and positions of stars in the FK5 and the HIPPARCOS catalogue},
  year={1997},
  pages={727-732},
  language={eng},
  isbn={92-9092-291-5 and 978-92-9092-291-9},
}
@incollection{UBHD-67497019,
  author={Wielen, Roland and Bernstein, Hans-Heinrich and Dettbarn, Christian and Hering, Roland and J{\"a}hrling, Rainer and Lenhardt, Helmut and Walter, Hans G.},
  title={A test of preliminary HIPPARCOS parallaxes using photometric parallaxes of distant stars},
  year={1994},
  pages={74-79},
  language={eng},
  isbn={0-521-46240-1 and 978-0-521-46240-2},
  booktitle={Galactic and solar system optical astrometry},
  editor={Morrison, L. V.},
}