We will continually update this list so please be sure to bookmark it in your favorites! Any suggestions please PM us or post in this thread.
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Research:
ADS Home Page
http://adsabs.harvard.edu/index.html
Aladin
http://aladin.u-strasbg.fr/aladin.gml
Constellation Guide
http://www.constellation-guide.com/
Harold Corwin's website
haroldcorwin.net/
Galaxy Zoo
http://www.galaxyzoo.org/
Google Sky
http://www.google.com/sky/
Hubble Legacy Archive
https://hla.stsci.edu/
Hyperleda
http://leda.univ-lyon1.fr/
Interactive NGC Catalog
http://spider.seds.org/ngc/ngc.html
IRSA WISE (Caltech)
http://irsa.ipac.caltech.edu/applications/wise/
Level 5
http://ned.ipac.caltech.edu/level5/
NED
http://ned.ipac.caltech.edu/
NGC/IC Project
http://www.ngcicproject.org/
http://www.ngcicproject.org/public_HCNGC/HCNGC.htm
Photometric Reference Page
http://www.rochesterastronomy.org/sn...ndex.html#wide
RC3 - Third Reference Catalog of Bright Galaxies
heasarc.gsfc.nasa.gov/W3Browse/all/rc3.html
SDSS DR8
http://skyserver.sdss3.org/dr8/en/tools/chart/navi.asp
Courtney Seligman's Image Atlas of the NGC/IC/PGC
http://cseligman.com/text/atlas/ngc00.htm#ngcic
SIMBAD
http://simbad.u-strasbg.fr/simbad/
Sky-Map.org
http://server7.sky-map.org/
SkyView
http://skyview.gsfc.nasa.gov/cgi-bin/query.pl
Dr. Wolfgang Steinicke - Deepsky Objects, Cosmology & Theoretical Physics
http://www.klima-luft.de/steinicke/index_e.htm
STScI Digitized Sky Survey
http://stdatu.stsci.edu/cgi-bin/dss_form
VizieR
http://vizier.u-strasbg.fr/viz-bin/VizieR
Webb Deep-Sky Society
http://www.webbdeepsky.com/
Webb Deep-Sky Society Free Downloads
https://www.webbdeepsky.com/publications/free/
WikiSky
http://www.wikisky.org/
Ned Wright's Redshift Calculator
www.astro.ucla.edu/~wright/CosmoCalc.html
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DSF Members pages:
Paul Alsings page
http://www.pnalsing.com/
Uwe Glahns page
http://www.deepsky-visuell.de
Adventures in Deep Space (Steve Gottlieb)
http://www.astronomy-mall.com/Advent...ace/index.html
Alvin Hueys page
http://www.faintfuzzies.com
Akarsh Simha's page
bas.org.in/dssdirect.php?id=M%2051
Reiner Vogels page
http://www.reinervogel.net/
Victor van Wulfens page
www.clearskies.eu
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Weather:
Clear Dark Sky
http://www.cleardarksky.com/csk/
Next Generation Weather Lab
http://weather.cod.edu/satrad/
North American HODAR
http://observatories.hodar.com/night.html
SkippySky Astronomy Weather Forecast
http://www.skippysky.com.au/
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Observing Reports:
Deep Sky Archive
http://www.deepsky-archive.com/index.php
Deep Sky Log (multilingual)
http://www.deepskylog.org/ -> English
http://www.deepskylog.fr/ -> French
http://www.deepskylog.de/ -> German
http://www.deepskylog.be/ & http://www.deepskylog.nl -> Dutch
Deep Sky Observers Companion - the online database
http://www.docdb.net/index.php
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Observing Programs:
Astronomy League
http://www.astroleague.org
TSP Observing Program Archives
https://texasstarparty.org/activitie...ogram-archive/
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Galaxies & Galaxy Clusters:
Arps Catalog of Peculiar Galaxies
http://arpgalaxy.com/
Arp Catalog images
http://www.338arps.com/
Arp Catalog Index
arp.schoenball.de/index_e.htm
Atlas of the Andromeda Galaxy
http://ned.ipac.caltech.edu/level5/ANDROMEDA_Atlas/frames.html
Atlas of the Andromeda Galaxy Globulars (PDF)
http://www.observatoriotresjuncos.co...bmag stars.pdf
Atlas of Local Group Galaxies (56mb 431 page pdf file. Recommended you save to hardrive upon downloading)
http://genti.extremeshare.org/Pepi/D...XGalaxiesB.pdf
Atlas of Peculiar Galaxies
http://ned.ipac.caltech.edu/level5/Arp/frames.html
Galaxy Distances
http://ned.ipac.caltech.edu/level5/NED1D/intro.html
Galaxy Morphology
http://bama.ua.edu/~rbuta/devatlas/
M33 Mapped
http://www.starkeeper.it/M33_Mapped.htm
M33 Mapped (Adventures in Deep Space)
http://www.astronomy-mall.com/Advent...ar.Clouds.html
Milky Way Explorer
http://galaxymap.org/mwe/mwe.php
Photographic Atlas of our Milky Way
http://www.library.gatech.edu/barnard/index.html
NGC Galaxies in the SDSS Data Release 2 (DR2)
https://www.astro.princeton.edu/~rhl/PrettyPictures/NGC/
Shapley-Ames Catalog
http://ned.ipac.caltech.edu/level5/S..._contents.html
VV Galaxy Atlas
http://ned.ipac.caltech.edu/level5/VV_Cat/frames.html
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Globular & Open Clusters:
Catalog of Parameters for Milky Way Globular Clusters
physwww.mcmaster.ca/~harris/mwgc.dat
DAML02
https://wilton.unifei.edu.br/ocdb/
Milky Way Globs
http://spider.seds.org/spider/MWGC/mwgc.html
Top 125 Open clusters
http://users.skynet.be/fc219947/openclusters.html
Trumpler Classification
http://www.astrophoton.com/trumpler_class.htm
WEBDA Open Cluster
http://www.univie.ac.at/webda/navigation.html
http://www.univie.ac.at/webda/maps.html
webda.physics.muni.cz
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Planetary Nebula:
100 Brightest PN
http://www.atlasoftheuniverse.com/plannebs.html
Atlas of the Universe Planetary Nebula
www.atlasoftheuniverse.com/plannebs.html
PN Halo Images
www.deepsky-visuell.de/Projekte/Halo.htm
PN Image Catalog
http://www.astro.washington.edu/users/balick/PNIC/
PN Observers Homepage
http://www.blackskies.org/
PN Spectra
http://web.williams.edu/Astronomy/research/PN/nebulae/
Protoplanetary Nebula
http://www.deepsky-visuell.de/Projekte/PPN.htm
SEC PN Database
http://www.iras.ucalgary.ca/saldatabase/Sec.html
Top 40 PN
http://users.skynet.be/fc219947/top40pn/index.html
MASH catalog of PN
http://cdsarc.u-strasbg.fr/viz-bin/Cat?V/127A
Monochromatic PN Images IAAT
http://astro.uni-tuebingen.de/groups/pn/
White Dwarf Catalog
http://www.astronomy.villanova.edu/WDCatalog/index.html
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Nebulae:
Barnard's DN Atlas
http://www.library.gatech.edu/barnard/
GUM Catalog
http://galaxymap.org/cgi-bin/gum.py?s=1
RCW Catalog
http://galaxymap.org/cgi-bin/rcw.py?s=1
Reflection Nebula
http://www.mpi-inf.mpg.de/~magnor/rnv.html
Sharpless Catalog
http://galaxymap.org/cgi-bin/sharpless.py?s=1
Sharpless Catalog (CCD Images)
http://www.sharplesscatalog.com/Sharpless.aspx
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Light Pollution Maps:
Blue Marble
https://blue-marble.de/nightlights/2012
Bortle Dark Sky Scale
https://www.handprint.com/ASTRO/bortle.html
Dark Sky Finder
http://www.jshine.net/astronomy/dark_sky/
Light Pollution Atlas
https://mywebspace.wisc.edu/dlorenz/...ronomy/lp2006/
Light Pollution Map - The Best one we have found!
https://www.lightpollutionmap.info/#...ers=B0FFFTFFFF
World Overlay atop Google Maps
https://mywebspace.wisc.edu/dlorenz/...rlay/dark.html
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Images & Sketching:
Astrobin
http://www.astrobin.com/
Deep Sky Watch
http://www.deepskywatch.com/
Princeton Univ collection of pretty SDSS objects
https://www.astro.princeton.edu/~rhl/PrettyPictures/
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Miscellaneous:
AGN's, Blazars & Quasars
http://quasar.square7.ch/fqm/fqm-home.html
AstroBin
welcome.astrobin.com
Comet Chasing by Skyhound
https://cometchasing.skyhound.com/
Filter Performance Comparison For Some Common Nebulae
http://www.prairieastronomyclub.org/...ommon-nebulae/
Heavens Above
http://www.heavens-above.com
High Redshift Objects (German)
http://www.strnad-emskirchen.de/qso_beobachtungen.html
In-The-Sky.org
in-the-sky.org
JW Inman
http://www.jwinman.com/starcharts/index.htm
Large Structure Applet
http://areu.free.fr/univers/large.php
Latest Supernovae Info
http://www.rochesterastronomy.org/snimages/
Limiting Magnitude Charts
http://obs.nineplanets.org/lm/rjm.html
TheSky Live
theskylive.com/
Things to view
http://www.saguaroastro.org/content/Things-to-view.htm
Shadow & Substance
www.shadowandsubstance.com
Vic Menards favorites (PDF)
http://vicmenard.com/the_list.pdf
Where is M13?
http://www.thinkastronomy.com
(We're sure there are plenty more so please, keep 'em coming and we'll add them to the list!)
