Astronomical database download

The third version is an Excel spreadsheet. For as many years as we have been observing the sky, SAC members have enjoyed viewing stars with color.

These tints are subtle and demand training your eye to see them, but we consider it worthwhile so that you can start to see stars as something other than white. Even with the naked eye some bright stars are ruddy in color; Antares and Betelgeuse are the most obvious examples. Adding a telescope to the pursuit of color in stars means that many more stars can be seen in color. Most often the colors viewed are mixtures of yellow, orange and red.

Several avid observers from years past have created a numeric scale for judging color in stars. I will provide you with just one of these, from J.

Schmidt, who was the head of the observatory in Athens, Greece for many years. He said that he never gave any star a rating of The spectra of a star tells much about the chemistry, temperature and other physical conditions of the star.

These stars often appear medium yellow to light orange to many observers. The carbon stars are stars that are surrounded by a cloud of carbon soot.

This cloud filters out most of the blue light from the surface of the star and makes them much redder to an observer. That listing contains 70 stars with very simple information on each.

This list is a greatly expanded version of that simple beginning. As always, if you know any data that would fill in gaps in this database please get in touch. The Asterisms data that accompanies this document contains information on all the known asterisms to the group of people I observe with;-. Tip: the SIZE field is going to determine the instrument you will want to use for observing the asterism. Use the best instrument to get the best view. Asterisms are fun groupings of stars that do not constitute an entire constellation; some of these objects are on the border between multiple constellations.

But, with a wide field instrument or some binoculars, there is a lot to see. Do not count on the data here being precise. I measured the size and magnitude of many of these asterisms using my planetarium program, Sky Map Pro. I do believe that most of the positions are good enough to get the asterism into a wide field eyepiece in most telescopes.

I am often at the www. Contact me there if you have another asterism to add or if you have found an error to report. Click here to download the ZIP file. This program creates reports, views entries and generates data extracts from that database for the purpose of creating observing lists or researching double star details. Links to some other on-line services are also provided. 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. Identifiers are linked to the nomenclature dictionary, providing full description of original list, and, when available, offering direct access to the corresponding catalogue in the CDS catalogue service VizieR and Bazaar Every bibcode is a link to the underlying bibliographic information, either at CDS, at ADS, or at the journal site when available. Links to the full text of paper are available in most cases.

For articles containing tables stored at CDS, the reference provides also a link to the table or catalogue. TAP queries. Display all user annotations. User's guide. Query by urls. Catalog: The ADS maintains three bibliographic databases containing more than ESASky is an application that allows you to visualise and download public astronomical data from space-based missions.

IRSA provides access to about a trillion astronomical measurements, including all-sky coverage in 24 bands.