Selectial immages and information. Space agenicies. Centre for Remote Imaging, Sensing and Processing. SuperWASP Homepage. Sloan Digital Sky Survey. SIMBAD Astronomical Database. SIMBAD on the Web is the WWW interface to the SIMBAD database.
It offers the following functionalities: Query by identifiers and around identifiers Query by coordinates, specifying the radius and the equinox Query by bibcode and partial bibcode Sampling with a set of physical criteria Query by lists of objects, coordinates or bibcodes Display charts for list of objects resulting from coordinates query Moreover, the interface provides links with many other data services : Links to the other CDS services: Tables in VizieR, giving access to the whole catalogued data, links to Aladin images, surveys and observatory logs. Through the coordinates in basic data, you can query around an object, using a provided radius. GLOBE at Night - Home page. The NRAO VLA Sky Survey. Missions. Skip to main content NASA Missions Loading ...
Historic Missions › NASA History › NASA Milestones › Historic Calendar Alphabetical List of Missions. Human Space Flight. European Virtual Observatory. The Astronomical Almanac Online. Out of the ordinary...out of this world. Astronomy Picture of the Day Archive. Latest Outer Space News, Breaking Headlines.
SAO/NASA ADS: ADS Home Page. Glossary of astronomical terms. The units used to describe brightness of astronomical objects.
The smaller the numerical value, the brighter the object. The human eye can detect stars to 6th or 7th magnitude on a dark, clear night far from city lights; in suburbs or cities, stars may only be visible to mag 2 or 3 or 4, due to light pollution. The brightest star, Sirius, shines at visual magnitude -1.5. Jupiter can get about as bright as visual magnitude -3 and Venus as bright as -4.
The full moon is near magnitude -13, and the sun near mag -26. Planet Hunters. Planetary Fact Sheets. Planetary Fact Sheets Sun Fact Sheet Mercury Fact Sheet Venus Fact Sheet Earth Fact Sheet Moon Fact Sheet.