Interactive Atlases

• Wiki-Sky

• Aladin Simple Previewer

• All-Sky Panorama by Axel Mellinger

• STScI Digitized Sky Survey

• SkyView - Multi-Survey Virtual Telescope

Scientific Resources

• DSS Online Images of the NGC Catalog

• SIMBAD - Set of Identifications, Measurements, and Bibliography for Astronomical Data

• NED - NASA/IPAC Extragalactic Database

• Aladin - Interactive Sky Atlas

Constellations

• IAU Constellations

• Constellation Guide

• SEDS Messier list by constellation

Databases

• NGC / IC Project

• Deep-Sky Database

• Deep-Sky Observer's Companion Online Database

• Messier 45 Online Catalog Database

• Courtney Seligman's Celestial Objects

• SEDS Messier list by object number

• SEDS Messier list by object type

• SEDS interactive NGC online catalog

• SEDS non-Messier objects database

Images

• STScI Digitized Sky Survey

• Astronomy Picture of the Day searchable archive

• E.E. Barnard's A Photographic Atlas of Selected Regions of the Milky Way

• Galaxies, Nebulae, Star Clusters by Al Kelly

• Photographic Sharpless Catalog by Dean Salman

• Van den Bergh Photographic Catalog by Tom V. Davis

• Panoptic Sky Survey by Nick Risinger

Deep-Sky Object Lists and Catalogs

• Deep Sky collections and catalogs similar to Messier's

• List of Common Deep-Sky Catalogs

• SEDS Deep Sky Collections and Catalogs meta list

General Information on Objects

• SEDS Messier Index

• SEDS Deep-Sky Collections and Catalogs

• Best Objects in the New General Catalog

• 100 Best Non-Messier Objects

• Carbon Stars

• AAVSO Variable Stars

• Wikipedia List of Variable Stars

• Sky and Telescope Observing Double Stars

Common Names for Deep-Sky Objects

• Common Names for Deep-Sky Objects

• Common Names for Messier Objects

• Galaxies with Proper Names

Traditional Atlases

• TRIATLAS

• Sky Atlas 2000

• Uranometria

• Pocket Sky Atlas

• DeepMap 600

Planetarium Programs

• Cartes du Ciel - free, powerful, planetarium program

• Stellarium - free

• Sky Safari - for iPad and Android

Plate Solving

• Astrometry.net

Observing Books

• Observing Handbook and Catalogue of Deep-Sky Objects by Christian B. Luginbuhl and Brian A. Skiff

• An Atlas of Deep-Sky Splendors by Hans Vehrenberg

• NightWatch: A Practical Guide to Viewing the Universe by Terence Dickinson

• The Backyard Astronomer's Guide by Terence Dickinson and Alan Dyer

• The Night Sky Observer's Guide by George Robert Kepple and Glen Sanner

• Celestial Portraits by Tom Polakis