SKYLINK, the server of the
French-speaking amateur astronomers, provides
containing, among other things, interesting conjunctions, twilight length,
planets visibility, Jupiter and Saturn satellites phenomena, actual comets,
Bureau des Longitudes
ephemerides, very detailed and accurate (positions, rises and sets of
solar system bodies, eclipses, starfield maps, ...).
AstroArts, in Japan,
gives monthly ephemerides (click on "calendar") as well as
rises and sets. Note the times are given in JST = UT+9.
Astroweb, site devoted to amateur
astronomy : monthly ephemerides, information about solar system, constellations,
of Guillaume Cannat, at Space News International.
The Space Calendar covers
space-related activities and anniversaries for the coming year. Included
are over 1100 links to related home pages. This Calendar is compiled and
maintained by Ron Baalke (JPL).
and orbital elements for currently-observable comets and minor planets,
at the Central Bureau for Astronomical Telegrams (IAU).
Hawaiian Astronomical Society
: myth, maps to magnitude 10, interesting objects description and images,
sorted by constellations. See also the lists of
Messier objects and
with localization maps.
atlas, at the Munich Astro Archive.
The Starfield Map Server of
the Bureau des Longitudes (France), creates sky maps à la carte (magnitude
The Digitized Sky Survey of the
STScI, also accessible at
ESO, produces detailed pictures
(magnitude limit ~ 20) of a region of the sky, extracted from the Palomar
Sky Survey (northern hemisphere) or the Southern Sky Survey (southern
hemisphere). Given a celestial object name (stars, Messier and NGC
objects, ...), this site also returns its coordinates.
SkyView offers the same services,
but in all wavelengths domains (radio, infrared, visible, ultraviolet, X-rays,
Moon observation: Moon map at the
ARVAL observatory or at
of lunar craters and seas by António Cidadão.
SKYLINK abounds in information
useful for observers; for example on the
l'observateur, you will find all the Messier objects, the 110 most
interesting NGC objects, a large number of NGC objects, star names and tons
of other data.
All the Messier objects are also in
the Messier catalog of
SEDS, and at the
University of Arizona.
Images and data concerning the NGC objects: the
NGC/IC Project or at the
Astronomical Society of the Pacific or at the
Orbital elements for most of the known asteroids are available at the
The Minor Planet
Center is responsible for the collection and dissemination of astrometric
observations and orbits for minor planets and comets. This site contains
e.g. ephemerides and orbital elements for
lists and plots (closest approaches to the Earth, plot of the outer solar
system, unusual minor planets, ...).
A must see ! Small communications satellites called Iridium, normally almost
invisible to the naked eye, occasionally brighten up during several seconds,
outshining by far all other celestial bodies. Such flares could reach magnitude
-8, as much as the half lit Moon ! These flares are bright enough to be seen
Heavens-Above provides Iridium flares
predictions for your location. For example,
Iridium flares visible from Liège for the next 7 days; these are
also available at the
Astronomique de Liège.
Further details on the Iridium constellation:
Visual Satellite Observer's
Heavens-Above also generates visibility
predictions with sky maps, for the International Space Station ISS and
other visible satellites, for any location on Earth.
At the Société
Astronomique de Liège, you will find the next Belgium overflights
of some bright artificial Earth satellites.
ISS passages over the whole world are available in
At the Visual Satellite
Observer's home page, you will find a lot of links to help you observe
artificial satellites (observing guides, on-line predictions, software, ...)
Orbital elements (TLE)
of all the artificial satellites, updated daily, are available at
CelesTrak. These elements,
computed by the NORAD (North American Aerospace Defense Command), are usable
as such in some satellite tracking programs. TLE are also available
on the Mike
Hubble Space Telescope
of the Day (APOD)
Discover the cosmos! Each day a different image or photograph of our fascinating
universe is featured, along with a brief explanation written by a professional
pictures are archived and sorted by subject.
(The World At Night)
A collection of stunning photographs of the world’s landmarks against the celestial
Optical Astronomy Observatory image gallery
Photography and Astronomy meet, in the middle ground between Art and Science.
Lots of images and information ! For example:
Nine Planets (a tour of the solar system),
the Web Nebulae
(spectacular images of the nicest nebulae), the
Messier Deep-Sky Catalog, the
World's Largest Optical Telescopes, etc...
Views of the Solar
Another staggering tour of the solar system, to learn everything about planets
and their satellites.
to the Planets
A collection of the best images from NASA's planetary exploration program.
Views of Our Solar System
A list of websites that offer images of solar system bodies.
An extensive collection of high-quality Apollo images.
NASA JSC Digital
A collection of more than 9000 photos of the NASA manned space program, from
Mercury to the Shuttle missions.
This site allows you to get an image map of any area on the Moon, Venus,
Mars, Callisto, Europa or Ganymede, at a variety of zoom factors, image sizes,
and map projections. These images are created using data from NASA planetary
At Space News, a detailed description of
system (in French).
The Bad Astronomy web pages are devoted to airing out myths and misconceptions
in astronomy and related topics. Examples : astrology = garbage; the Apollo Moon hoax;
why the Moon looks bigger on the horizon; water spins down a drain one way in the Northern
hemisphere and the other way in the Southern hemisphere; science fiction movies:
what is science and what is fiction...