Urban Observing Program

Urban Club LogoUrban Observing Program Coordinator:

Dr. Terry N. Trees
374 Vernon Street
New Kensington, PA  15068-5864
(714) 337-3231
Email: TreesT@comcast.net



Welcome to the Astronomical League's Urban Observing Program!

The purpose of the Urban Observing Program is to bring amateur astronomy back to the cities, back to those areas that are affected by heavy light pollution. Amateur astronomy used to be called "backyard astronomy". This was in the days when light pollution was not a problem, and you could pursue your hobby from the comfort of your backyard. But as cities grew, so did light pollution, and the amateur astronomer was forced to drive further and further out into the country to escape that light pollution. It is not uncommon today for a city dweller to drive 100 miles to enjoy his/her hobby. But many people do not have the time or the resources to drive great distances to achieve dark skies. That is the reason for the creation of this program, to allow those who want to enjoy the wonders of the heavens in the comfort of their own neighborhoods to do so, and to maximize the observing experience despite the presence of heavy light pollution.

Our crack team of observers observed the objects on this list from the East Coast to Middle America to the West Coast, and from major metropolitan areas like Miami, Baltimore, Dallas, Houston, and Los Angeles. Limiting magnitudes went from a high of 4, down to 2, to a "Geez" as Becky Schultz commented on one particularly bad evening. Instruments ranged from a six-inch reflector to a ten-inch SCT. So as you can see, there is a world of objects out there that can be enjoyed under even poor skies, and it only takes a small to medium sized telescope to enjoy them. We sincerely hope that this program encourages you to continue your enjoyment of this wonderful hobby of ours.


Rules and Regulations

To qualify for the Astronomical League's Urban Observing Program certificate and pin, you need only be a member of the Astronomical League, either through an affiliated club or as a Member at Large, and observe 100 objects on the Urban Observsing Program list in light polluted skies. For the purposes of the Urban Observing Program, light-polluted skies are defined as any skies where you cannot see the Milky Way with the unaided eye."  (As examples, consider dark orange to white; a Bortle Scale of 5 or higher, on this chart: http://cleardarksky.com/lp/AchAqONlp.html?Mn=telescope%20accessory  However, even though these sites do suffer from severe light pollution, if the Milky Way happens to be visible on a given night, that night is not usable.). You may observe the objects with the unaided eye, binoculars or any size telescope. However, telescopes from six to ten inches of aperture are recommended since a larger aperture helps pull out fainter objects in non-contrasty skies. Previous observations of these objects may be used toward this program as long as they were done in light polluted skies. Previous observations from dark sky sites may not be used. All observations made in achieving the certificate for the Urban Observing Program may be used toward certificates of other A.L. Observing Programs.

To record your observations, you may use log sheets similar to those found in the back of the Astronomical League's manual Observe: A Guide to the Messier Objects. You can order the Observe manual through Astronomical League Sales. If you use your own log sheets, they must include:

  • object name
  • date and time (local or UT)
  • seeing and transparency
  • latitude and longitude
  • type of instrument and magnification
  • observing notes.  (Observing notes do not have to be extensive.  Simply include a phrase or a sentence or two describing what you saw.  For example, “A small fuzz ball that couldn’t be resolved in the light pollution”, “A double star comprised of two bright white stars”, etc.)

If you need to become a member of the Astronomical League as a Member-at-Large, click here.


List of Objects

There are actually two lists, one for deep-sky objects, and another for double and variable stars. All objects are listed in Right Ascension order so that you can view them as they rise in the East and set in the West.

Information provided on each deep-sky object includes:

  • Catalog Number
  • Right Ascension and Declination
  • Magnitude
  • Messier Designation (if any)
  • Type of Object, Size
  • Constellation
  • what chart it is located on in both the Uranometria or Tirion's Sky Atlas 2000

Information provided on double and variable stars includes:

  • Object
  • Right Ascension and Declination
  • Magnitudes
  • Separation of the components

I hope you enjoy this list of objects to observe, and that it helps increase your satisfaction in observing from a light polluted area. I will look forward to your sharing your observations with me. Until then, good luck, clear skies, and good observing!



I and the Astronomical League wish to gratefully acknowledge Phillips S. Harrington of the Westport Astronomical Society for his suggestion and support in creating this Observing Program.

We also gratefully acknowledge the hard work of the following people who helped to select and check all the objects in the two lists:

John A Barra - Peoria Astronomical Society
Ken Boquist - Quad-Cities Astronomical Society
Bill Geertsen - Harford County Astronomical Society
David Hasenauer - Texas Astronomical Society of Dallas
Ire Maisier - Member-at-Large
Chris Randall - Fort Bend Astronomy Club
Becky Schulz - Fort Bend Astronomy Club
Jim Tomney - Baltimore Astronomical Society
Roberto Torres - Southern Cross Astronomical Society


Submitting for Certification

When you have observed all 100 objects either send your logs to the Urban Observing Program Coordinator or have them reviewed and approved by an officer in your astronomy club.  They can then send an email to the Urban Observing Program Coordinator.

Be sure to include your name, mailing address, email address, phone number, society affiliation, and to whom the certification whould be sent.


Urban Program Coordinator:

Dr. Terry N. Trees
374 Vernon Street
New Kensington, PA  15068-5864
(714) 337-3231
Email: TreesT@comcast.net



Urban Observing Program - Deep Sky Objects
Urban Observing Program - Double and Variable Stars
Urban Observing Program - Tips for Observing in Light Polluted Areas
Find Your Urban Observing Program Award