Predictions of stellar occultations by the main planetary satellites
Short Name:
voccdb.epn_core
Date:
19 Apr 2024 14:16:01
Publisher:
Paris Astronomical Data Centre
Description:
The VOccDB database provides prediction and parameters of stellar
occultations by the main planetary satellites. Observations of a
stellar occultations help to better determine the size and the shape
of the occulting body, as well as its astrometric position at the
milli-arcsecond level precision. Only the main moons of giant planets
Jupiter, Saturn, Uranus and Neptune are considered in the event
prediction database. Predictions are provided over period 2023-2032,
up to visual magnitude 12 for the biggest satellites, and magnitude 14
for other satellites. For each stellar occultation event prediction,
the database provides circumstances and observational data, date and
timing of the occultation, star position and magnitude, excepted
duration, etc.
This service provides the physical and dynamical characteristics of
natural satellites in the Solar System: size, mass, rotational
properties, magnitude and albedo, orbital elements. These quantities
are taken from various publications listed under the bib_reference
parameter. These data will be updated as new values are published.
This service provides a compilation of spectra of asteroids in the
visible and NIR range. It is composed of various libraries distributed
as VizieR catalogues. Reformatted VOtable or fits versions are
provided with thumbnails. Ephemeris data are retrieved from Miriade
(IMCCE) for the reference date when possible.
This service provides a compilation of global spectra of planets and
satellites in the visible and NIR range, for quick reference purpose.
It is made from various libraries, including the
Tohoku-Hiroshima-Nagoya Planet Spectra Library (Lundock et al 2009)
and spectra from a USGS web site (R. Clark). Reformatted VOtable
versions are provided together with links to the original data.
SSA service for RCSED spectrophotometric catalog of nearby galaxies
Short Name:
CZKM_SSAP
Date:
03 Apr 2022 16:03:40
Publisher:
Paris Astronomical Data Centre
Description:
miror service of Observed spectra and their fitted models for galaxies
from RCSED catalog (derived from cross-match between SDSS, GALEX, and
UKIDSS catalogs)
The stellar spectra service is a compilation of several libraries
distributed by large observatories, which are intended to calibrate
telescopic observations. It currently provides access to two libraries
of reference stars distributed by ESO (composite spectra:
https://www.eso.org/sci/observing/tools/standards/IR_spectral_library.html)
and NASA IRTF (observations from SpeX:
http://irtfweb.ifa.hawaii.edu/~spex/IRTF_Spectral_Library/References_files/All.html).
Since 1973, the 18-cm lines of the OH radical have been
systematically observed in a number of comets with the Nançay radio
telescope. This allowed an evaluation of the cometary water production
rates and their evolution with time, as well as a study of several
physical processes: the excitation mechanisms of the OH radio lines,
the expansion of the cometary atmospheres, their anisotropy in
relation with non-gravitational forces, the Zeeman effect in relation
with the cometary magnetic field. The Nançay observations of 53
cometary apparitions between 1982 and 2009 are now organized in this
database.