Transcript A VOTable application

A VOTable application:
Solar System objects in the VO
J. Berthier1, F. Vachier1,
V. Lainey1, W. Thuillot1, J.-E. Arlot1,
P. Fernique2, F. Ochsenbein2, F. Genova2
1 Institut de Mécanique Céleste et de Calcul des Ephémérides
(IMCCE / Obs. de Paris, France)
2 Centre de Données astronomiques de Strasbourg (CDS, France)
Kyoto Interop meeting, 17 May 2005
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• Introduction
• interconnection IMCCE/CDS servers : VizieR
• SkyBOT: a web service for Solar System objects
• Implementation of SkyBot in ALADIN
Kyoto Interop meeting, 17 May 2005
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IMCCE and CDS
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Institut de Mécanique Céleste et de Calcul des Ephémérides
✔ Celestial mechanics: numerical and analytical dynamical
theories
✔ Astrometry and models for the motion of the Solar system
bodies
✔ Ephemerides
CDS
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Data center dedicated to the collection and worldwide
distribution of astronomical data and related information
Expert in data bases and applications:
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Simbad, Vizier, Aladin
Astrophysical objects, no solar system objects
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The Virtual Observatory
Project of IMCCE
Ephemerides and Virtual Observatory
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Tools to support observation and analysis:
- Web services for fundamental astronomy and planetology
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Databases :
- Orbital and physical parameters (collab. with data centers)
- Observational data : astrometric images and measurements
- Codes and algorithms: dynamical models
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Positions and aspects of Solar system bodies :
- Solar system objects / stellar fields
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VIZIER:
a IMCCE – CDS interconnection
Query asteroids in ASTORB database (Bowell, 1976) via VizieR
Ephemeris computation for the current date
Query form for new computations
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Query form accessible through CGI scripts (2003)
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VOTable (available in 2005)
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XML web service (end of 2005)
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 Identification of small bodies
on « old » plates or CCD frames ?
 Numerical integration of numerous asteroids
 Selection of candidates in these orbits
Far too long
for a VO request
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Sky Bodies Tracker
“SkyBoT” project
Concept:
✔ Pre-calculated ephemeris database of the Solar system
bodies
✔ Asteroids, planets, natural satellites, comets
✔ From 1840 (first astronomical photography) to 2019 (Gaia)
Applications:
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Solar system objects checker
Sky charts for astronomical observations
Fast ephemerides generator
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Implementation
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“Astorb” database from Lowell observatory for
✔ initial conditions
✔ Number of asteroids
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Numerical integration of all the asteroids over the time span (1949-2019)
Mean equatorial heliocentric J2000 rectangular coordinates
➔ Time step of 10 days
➔ Inititial conditions for further computation
Equatorial geocentric astrometric J2000 coordinates
➔ Time step of 1 day
➔ Interpolated ephemeris for any date
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Position error from 10 mas up to tens of arcsec
➔ Depending on the quality of the orbit (CEU, CEU rate in Astorb)
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SkyBoT Database
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> 282,000 asteroids at that time
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Tabulated positions over the time span
(~1 Tø of data; ~10 billions of records)
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Weekly updates
✔
php/MySQL engine in order to deal with a
selected date
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•282 000 ast.
< 580 000 boxes
•10 days interval
10 days interval
•Equat. Coo. (t)
•X,Y,Z (t)
Numb.of the
asteroids inside
Ephemerides
1949
.
.
.
Ephemerides
2019
Boxes~20’x 20’
Boxes
1949
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.
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Boxes
2019
date + FOV
asteroids
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SkyBoT Tools
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“Cone-search” and “Resolver” tools
Query form accessible through the HTTP protocol
Web services accessible through the SOAP protocol
Query form on the IMCCE web site
“On-demand” tools and implementation
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« Cone Search » version
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« Cone Search » version
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« Resolver » version
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« Resolver » version
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SkyBot help : XML service
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SkyBot help : XML service
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Implementation in
the Aladin interactive sky atlas
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Search in
archive
With
Aladin
(prototype)
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Search in
archive
With
Aladin
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Search in
archive
With
Aladin
1995 WL4
+
SkyBoT
Jungmann
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The ingredients
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VOTable
Registry (GLU)
Take time (Epoch) properly into account in
Aladin
For the moment basically the ‘normal’
Aladin functions, some customization
before the service is made public
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SkyBoT project
Schedule
2005: next in Aladin V.3 – probably in September
✔ 1949 – 2019
✔ Asteroids, Planets and major natural satellites
2006:
✔ 1840 – 1949
✔ Other natural satellites, comets
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SkyBoT project
Applications:
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Search for small body
Dating of plates without log book (?)
Data mining (photographic plates, survey)
Improvement of Near Earth Asteroids orbits
Simulated data to prepare space missions (Gaia,
interplanetary navigation, ...)
Education
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Education
3D simulation of the
Solar system
Jupiter
KBO
Trojans
From 10 UA
Pluto
KBO
From 50 UA
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Conclusion
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Interaction between two institutes in VO frame
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Interpretation / preparation of observations
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Pre-discoveries of asteroids and comets
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Application to any archive or user’s frames
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Data mining for NEO and other Solar System
objects
http://www.imcce.fr/webservices/
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