Finding Useful Information ON THE WEB

Published papers Most published papers in astronomy can be found on the NASA Astrophysics Data System: Most published papers in astronomy can be found on the NASA Astrophysics Data System:

ADS To access the most recent papers in some journals you will need a subscription to them, or access them from an institution that has a subscription To access the most recent papers in some journals you will need a subscription to them, or access them from an institution that has a subscription

Preprints These are papers posted on the web before they have been published in a journal These are papers posted on the web before they have been published in a journal Many preprints are posted on astro-ph: Many preprints are posted on astro-ph: No subscription is needed to access these preprints.

Preprints If you want, you can have the astro-ph website send you daily the list of new preprints posted on their site If you want, you can have the astro-ph website send you daily the list of new preprints posted on their site

Solar System Ephemerides JPL Horizons On-Line Ephemeris System JPL Horizons On-Line Ephemeris System The JPL Horizons On-Line Ephemeris System provides easy access to key solar system data and flexible production of highly accurate ephemerides for solar system objects. This includes 170,000+ asteroids & comets, 128 natural satellites, 9 planets, the Sun, select spacecraft, and several dynamical points such as Earth-Sun L1, L2 and system barycenters. Users may define their own objects, then use the system to integrate the trajectory, or conduct parameter searches of the comet/asteroid database, searching on combinations of up to 42 different parameters. Rise, transit and set may be identified to the nearest minute. Close-approaches by asteroids and comets to planetary bodies (and Ceres, Pallas, and Vesta) can be easily identified. Orbit uncertainties can be computed for asteroids and comets. The JPL Horizons On-Line Ephemeris System provides easy access to key solar system data and flexible production of highly accurate ephemerides for solar system objects. This includes 170,000+ asteroids & comets, 128 natural satellites, 9 planets, the Sun, select spacecraft, and several dynamical points such as Earth-Sun L1, L2 and system barycenters. Users may define their own objects, then use the system to integrate the trajectory, or conduct parameter searches of the comet/asteroid database, searching on combinations of up to 42 different parameters. Rise, transit and set may be identified to the nearest minute. Close-approaches by asteroids and comets to planetary bodies (and Ceres, Pallas, and Vesta) can be easily identified. Orbit uncertainties can be computed for asteroids and comets.

Can give you positions, distances, and other information about a wide range of celestial objects Can give you positions, distances, and other information about a wide range of celestial objects

SIMBAD Provides a variety of information on individual objects, mainly on stars Provides a variety of information on individual objects, mainly on stars

Clear Dark Sky Predicted sky conditions for different locations and links to other useful sites Predicted sky conditions for different locations and links to other useful sites

Satellite Predictions Heavens Above Heavens Above Can be accessed from the Clear Dark Sky website Can be accessed from the Clear Dark Sky website

Variable Stars American Association of Variable Star Observers American Association of Variable Star Observers General Catalog of Variable Stars

AAVSO

SPACE WEATHER

SpaceWeather.com

Magazines Sky and Telescope Sky and Telescope Astronomy Astronomy

Astronomical Societies American Astronomical Society American Astronomical Society Has a section about astronomy as a career Has a section about astronomy as a career

Astronomical Society of the Pacific org/ org/ org/ org/

Association of Lunar and Planetary Observers

Saturn: ALPO

Jupiter: ALPO

Astronomy Picture of the Day

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