- Scientific aims
The series of resolutions passed by the International Astronomical Union at its General Assemblies in 1997 and 2000 are the most significant set of international agreements in fundamental astronomy in several decades. These resolutions concern the definition of the astronomical reference systems and transformations between them, which are required when dealing with the Earth's rotation or when computing directions of celestial objects in various systems.
Continuing efforts have been made since 2000 to implement these resolutions, and to prepare a well defined terminology and high accuracy models associated with this implementation. The adopted reference systems and the high-accuracy models which have been recently developed make possible various scientific applications in a number of fields of astronomy.
Joint Discussion 16 entitled "Nomenclature, Precession and new models in Fundamental Astronomy. Applications and scientific contribution to astronomy" has two objectives.

One objective is to introduce the general astronomical community to the state of the art in the implementation of the IAU resolutions, the nomenclature in fundamental astronomy and the high-accuracy models for precession, the ecliptic and other astrometric models for reducing high-accuracy observations.
Another objective is the presentation of scientific applications of high accuracy astrometric observations, models and accurate realizations of reference systems for ephemerides, celestial mechanics, astrometry, Earth rotation, time and radio-astronomy.
- Sessions
JD 16 will be composed of six sessions, each of them consisting of a few invited talks, and oral and poster contributions.

The sessions will be the following:

1: State of the art of the implementation of the IAU Resolutions and the ICRS

2: Precession and the Ecliptic

3: High accuracy models for reducing astronomical observations

4: New terminology in fundamental astronomy, time and relativity

5: Scientific applications of high accuracy astronomy

6: General Discussion and educational efforts
- Instructions for presentations
Instructions to speakers
The duration of the talks is 20 min for invited talks including dicussion and 10 min for the oral communications. Due to the large number of presentations, the speakers are requested to be very strict with the time that is allocated.

See also the general Instructions for oral presentations at the IAU GA.
Instructions for poster presentations
There will be a short poster review at the end of the morning session on Tuesday 22 August (12:20-12:30) and two poster sessions on the same day (12:30-13:00 and 17:30-18:00) where the authors of posters are requested to be beside their poster.

The poster papers for JD16 will be displayed in Terrace II (T2) on the 2nd floor during the second week of the GA.

See also the general Instructions for poster presentations at the IAU GA.
- JD 16 program
The following JD 16 program has been prepared by the JD SOC with the invited papers that were selected in a previous stage and abstracts selected from those that were available on the IAU GA submission abstracts server on 26 June (IAU deadline for abstracts submission). Each abstract accepted by the SOC to be part of oral and poster presentations of the final program has been assigned an internal number in the session which will be the order in which the abstracts will appear in the IAU XXVIth GA Abstract Book.

Program (PDF) (latest update: 12 August 2006)
Program
Presentations on line
(latest update: 20 September 2006)
Tuesday 22 August 2006 (a.m.)
9:00-9:10 Opening of JD16
- Introduction to the Joint Discussion (N. Capitaine, JD16 SOC co-Chair) Abstract, PDF file
9:10-10:30 Session 1- State of the art of the implementation of the IAU Resolutions and the ICRS
(Chair: J. Vondrák)
9:10-9:50 Invited papers
- Present status of the celestial reference system and frame (C. Ma) Abstract, PDF file
- Tools for implementing the recent IAU resolutions: USNO Circular 179 and the NOVAS software package (G. Kaplan, J. Bangert) Abstract, PDF file
9:55-10:25 Oral papers
- Selecting highly-compact radio sources for the definition of the celestial reference frame
(P. Charlot et al.) Abstract, PDF file
- Véron & Véron based optical extragalactic reference frame - progress report (A. Andrei et al.) Abstract, PDF file
- Problems of the reference radio source selection (O. Titov) Abstract, PDF file
10:30-11:00: Coffee break
11:00-12:20 Session 2- Precession and the Ecliptic
(Chair: T. Fukushima)
11:00-11:40 Invited papers
- Review on the work of the "Precession and ecliptic" Working Group (J. Hilton) Abstract, PDF file
- Long-term solution for the insolation quantities of the Earth (J. Laskar) Abstract, PDF file
11:45-12:15 Oral papers
- Using the P03 precession model (P. Wallace, N. Capitaine) Abstract, PDF file
- Long-periodic precession parametrization (J. Vondrák) Abstract, PDF file
- Numerical theory of rotation of the deformable Earth with the fluid core: fitting to VLBI data and deriving corrections to IAU 2000 theory (G. Krasinski) Abstract, PPS file
12:20-12:30: Short poster review
12:30-13:00: Poster session
13:00-14:00: Lunch
Tuesday 22 August 2006 (p.m.)
14:00-15:30 Session 3 - High accuracy models for reducing astronomical observations
(Chair: J. Hilton)
14:00-14:40 Invited papers
- Models for high precision spacecraft and planetary ephemerides (M. Standish, J G Williams) Abstract, PDF file
- Relativistic aspects of the Earth's rotation (S. Klioner, M. Soffel) Abstract, PDF file
14:45-15:25 Oral papers
- The dynamical model of the planet motions and EPM ephemerides (E. Pitjeva) Abstract, PDF file
- INPOP06: A new planetary ephemeris (A. Fienga et al.) Abstract, PDF file
- Accurate harmonic development of lunar ephemeris LE-405/406 (S. Kudryavtsev) Abstract, PDF file
- The solar quadrupole moment from planetary ephemerides: present state of the art
(S. Pireaux et al.) Abstract, PDF file
15:30-16:00: Coffee break
16:00-17:30 Session 4 - New terminology in fundamental astronomy, time and relativity
(Chair: M. Soffel)
16:00-16:40 Invited papers
- Proposed terminology in fundamental astronomy based on IAU 2000 Resolutions
(N. Capitaine et al.) Abstract, PDF file
- Implementation of the new nomenclature in the Astronomical Almanac (C. Hohenkerk) Abstract, PDF file
16:45-17:25 Oral papers
- TDB or TCB: does it make a difference? (S. Klioner) Abstract, PDF file
- From atomic clocks to coordinate times (G. Petit) Abstract, PDF file
- Pulsars as barycenter coordinate clocks (V. Zharov et al.) Abstract, PDF file
- General relativity theory: tests through time (Ya. Yatskiv) Abstract
17:30-18:00: Poster session (continuation)
Wednesday 23 August 2006 (a.m.)
9:00-10:30 Session 5 - Scientific applications of high accuracy astronomy
(Chair: V. Dehant)
9:00-9:40 Invited papers
- Accurate optical reference catalogs (N. Zacharias) Abstract, PDF file
- Scientific potential of the future space astrometric missions (L. Lindegren) Abstract, PDF file
9:45-10:25 Oral papers
- Space astrometry with the milli-arcsecond pathfinder survey (MAPS): mission overview and science possibilities (Gaume et al.) Abstract, PDF file
- Astrometric science with SIM planetQuest ( M. Shao ) Abstract
- Does the magnetic field in the fluid core contribute a lot to Earth nutation? (C-L. Huang et al.) Abstract, PDF file
- Retrieving diurnal and semidiurnal signals in polar motion and UT1 from analysis of the routine VLBI observations (A. Brzezinski, S. Bolotin) Abstract, PDF file
10:30-11:00: Coffee break
11:00-12:30 Session 6 - General Discussion and educational efforts
(Chair: N. Capitaine)
11:00-11:40 Invited papers
- Education in astrometry (W. van Altena) Abstract, PDF file
- The 3D representation of the new transformation from the terrestrial to the celestial system (V. Dehant et al.) Abstract, PPT file
11:45-11:55 Oral paper
- The small telescopes still useful for astrometry (M. Stavinschi) Abstract, PDF file
11:55-12:20 Discussion
12:20-12:30 Conclusion of JD16
Concluding remarks (J. Vondrák, JD16 SOC co-Chair)

List of Posters
Session 1 - State of the art of the implementation of the IAU Resolutions and the ICRS
- Searching candidate radio sources for the link with the future GAIA frame (P. Charlot et al.) Abstract
- New data of linking optical and radio reference frames (Z. Aslan et al.) Abstract
- Systematic errors and combination of the individual CRF solutions in the framework of the IVS ICRF pilot project (J.R. Sokolova) Abstract
- Kinematic control of the inertiality of the ICRS/TYCHO-2 system on the base of the TYCHO-2 and UCAC2 star proper motions (V.V. Bobylev, M.Yu. Khovrichev) Abstract
- VLA Radio Star Measurement of the Rotation of the Hipparcos Frame with Respect to the ICRF (D. A. Boboltz et al.) Abstract
- Deep Astrometric Standards (I. Platais et al.) Abstract
- Better accuracy of Hipparcos proper motions in declination for stars observed with 10 photographic zenith tubes (G. Damljanovic, J. Vondrák) Abstract
- Torino Observatory Parallax Program in the Catalog of Nearby Stars (R.L. Smart et al.) Abstract
- The influence of choice of fundamental catalogue on calculated apparent places of stars (M.S. Sekowski) Abstract
- Connection between ICRS and ITRS consistent with IAU 2000 Resolutions (I. Kumkova, M. Stepashkin) Abstract
- Earth orientation catalogue EOC-3 - An improved optical reference frame (V. Stefka, J. Vondrak) Abstract
- Catalogue of reference stars for observation of extragalactic radio sources of the northern sky (V. Ryl'kov et al.) Abstract
- Estimation of CRF and TRF from VLBI observations by the least square collocation method (S. L. Kurdubov) Abstract
- Computation of the veritable inclination Between FK5 and Hipparcos equators: a critical discussion (M.J. Martínez Usó et al.) Abstract
- The Russian astronomical yearbooks and IAU 2000 resolutions (N.I. Glebova et al.) Abstract
Session 2 - Precession and the Ecliptic
- Precession/nutation solution consistent with the general planetary theory (V.A. Brumberg, T.V. Ivanova) Abstract
- New expressions for the celestial coordinates of the CIP (M. Folgueira et al.) Abstract
- Comparison of the nutation theories with the VLBI observations (V. Zharov, S. Pasynok) Abstract
- Selected sets of nutation parameters for estimation over limited observation spans (Ya. Chapanov) Abstract
- Variations of the main nutation terms according the precession-nutation model IAU 2000A (Ya. Chapanov) Abstract
- Comparison of nutation series from GPS and VLBI observations using IAU1980 and IAU2000 nutation models (K. Snajdrova et al.) Abstract
- To determination and explanation of the secular change of inclination of the Earth equator to ecliptic (Yu. Barkin) Abstract
Session 3 - High accuracy models for reducing astronomical observations
- Limitations on some physical parameters from position observations of planets (E. Pitjeva) Abstract
- About mechanism of variations of the Earth rotation and natural processes with hour periods (Yu.V. Barkin) Abstract
- Geodetic rotation of the Sun, major planets, and the Moon (V.I. Eroshkin, V.V. Pashkevich) Abstract
- Model of atmospheric radiation for large field radioastronomical data reduction (S. Rys, M. Urbanik) Abstract
- Relativistic ray tracing applied to a rotating optical system (G. Anglada-Escude et al.) Abstract
- VLBI antenna thermal deformation (E. Skurikhina) Abstract
Session 4 - New terminology in fundamental astronomy, time and relativity
- About the reference axis of the rotation of the Earth (R.O. Vicente) Abstract
- Stability of pulsar time scale (M.V. Sazhin, M.S. Pshirkov) Abstract
- Relativistic angular distance using Synge's world function (C. Le Poncin-Lafitte, P. Teyssandier) Abstract
- Positioning systems and relativity (J.-F. Pascual-Sánchez) Abstract
Session 5 - Scientific applications of high accuracy astronomy
- Ten years timing of millisecond pulsars at Kalyazin (Yu. Ilyasov, V. Oreshko) Abstract
- The Parkes pulsar timing array (R.N. Manchester) Abstract
- Preliminary results in asteroid mass determinations in Nikolaev Observatory (Z. Aslan et al.) Abstract
- Evidences of correlations between masses and minor planets elements. Analysis of the error sources (F.J. Marco Castillo et al.) Abstract
- On geophysical excitation of prograde diurnal polar motion (M. Kudryashova et al.) Abstract
- Atmospheric excitation of UT1 variations during CONT05 campaign (Y. Masaki) Abstract
- High frequency variability in Earth rotation from VLBI and GNSS data (S. Englich et al.) Abstract
- Optimum parameterization in estimating sub-diurnal Earth rotation parameters with Very Long Baseline Interferometry (P.J. Mendes Cerveira et al.) Abstract
- Variations of the second order harmonics of geopotential from the analysis of the Lageos and Etalon SLR data for 1988-2003 (T.V. Ivanova, N.V. Shuygina) Abstract
- Comparison of velocity field and baseline length variations for the European stations derived from GPS and VLBI data (N. Panafidina et al.) Abstract
- Hydrological excitation of polar motion (J. Nastula, B. Kolaczek) Abstract
- CONT05: High-frequency Earth rotation variations from VLBI observations (E. Skurikhina) Abstract
- Estimation of Earth interior parameters from a Bayesian inversion of nutation data in the time domain (L. Koot et al.) Abstract

- Proposers
N. Capitaine (France), J. Vondrák (Czech Rep.), J. Hilton (USA)
- Contact person
Contact person: Nicole Capitaine,

Observatoire de Paris, Syrte, 61 avenue de l'Observatoire, 75014, Paris, France
- Proceedings
The Proceedings of JD16 will be published in the "Highlights of Astronomy", Volume 14, in which 30 pages will be allocated to this JD. In addition, there will be a Table of contents, subject-, object- and author- indexes, and a Preface providing a summary of the entire JD including the discussion.

Editors: N. Capitaine (Chief Editor) (e-mail) , J. Vondrák, J. Hilton

The JD Proceedings will include:

- one page abstract for the invited papers,
- half page abstract for oral papers,
- 1/5 page abstract for poster papers,

Authors are requested to submit their contributions to the chief editor at the time of the GA.

The deadline is 25 August 2006

See the Instructions for authors (in IAU Highlights of Astronomy)
- Organizing Divisions/Commissions
Coordinating IAU Division: Division I (Fundamental Astronomy): T. Fukushima (Japan), e-mail

Coordinating IAU Commission: Commission 19 (Rotation of the Earth): V. Dehant (Belgium), e-mail

Participating IAU Division: Division X (Radio Astronomy)

Participating IAU Commissions:

       Commission 4 (Ephemerides)
       Commission 5 (Documentation and astronomical data)
       Commission 7 (Celestial Mechanics and Dynamical Astronomy)
       Commission 8 (Astrometry)
       Commission 31 (Time)
       Commission 40 (Radio Astronomy)

Other supporting Organization: IAG (International Association of Geodesy)
Expected maximum number of participants: 150
- Scientific Organizing Committee (SOC)
N. Capitaine (France) (co-Chair), e-mail
J. Vondrák (Czech Rep.) (co-Chair), e-mail
J. Hilton (USA) (co-Chair), e-mail

A. Brzezinski (Poland): Commission 19 Representative
M. Calabretta (Australia): Commission 5 Representative
V. Dehant (Belgium): IAG Representative
T. Fukushima (Japan): Division I President
K. Johnston (USA): Division X / Commission 40 Representative
I. Kumkova (Russia): Commission 8 Representative
A. Milani (Italy): Commission 7 Representative
R. Nelson (USA): Commission 31 Representative
K. Seidelmann (USA): Commission 4 Representative
M. Soffel (Germany): RCMAM WG Representative
 
- Links: Sites of Interest for this JD
IAU 2000 Resolutions

IAU 2006 Resolutions 1-3

IERS Conventions 2003

IAU 2006 General Assembly:Result of the IAU Resolution votes

IAU NFA WG Resolution Proposals adopted by the IAU 2006 GA

IAU Precession and Ecliptic WG Resolution Proposal to the IAU 2006 GA

IAU Working Group on "Nomenclature for Fundamental Astronomy" (IAU NFA WG)

IAU Homepage

Div I Homepage (Fundamental Astronomy)

Division X Homepage (Radio Astronomy)

Commission 19 (Rotation of the Earth)

IAG International Association of Geodesy

IERS Homepage

IVS Homepage