Flat Galaxies Observing Program

Flat Galaxies Observing Program Coordinator:

Al Lamperti
112 Pebble Beach Drive
Royersford, PA 19468

Flat Galaxies observing club logo


Detection of shape and form in galaxies is a visual challenge. As a general class of galaxies, edge-on galaxies are a pleasant yet demanding change of pace. A subclass of edge-on galaxies are flat galaxies which are defined as having a diameter larger than 40 arc-seconds and a major to minor axis ratio of >= 71. This unique brand of galaxies is used as a tool for studying large scale motions and distances. Karachentsev et al1 published the fact that there is a tight correlation between their linear diameter and the width of the 21cm line that can be detected. There are thousands of flat galaxies catalogued1,2 with many of them well beyond the limit of visual observations. The galaxies selected are brighter than 15th magnitude, with the majority well within the range of amateur telescopes.


Purpose & Significance

The purpose of this Observing Program is to provide a unique challenge for visual and imaging observers in both the Northern and Southern hemispheres. It is designed to hone the observer’s skills in locating, detecting, observing, and recording observations such as determining the PA (position angle) of flat galaxies. The objective is to provide a venue for the advanced amateur observer to become more familiar with this class of galaxy classification and begin to appreciate the ease or difficulty in detecting them. This Observing Program serves to consolidate as well as bring to light this unusual class of galaxies.


  • Observers will be required to observe any 50 flat galaxies from Appendix A (list is attached) for the Flat Galaxy Observer Regular Certificate and any 100 flat galaxies from Appendix A for the Honorary Certificate plus a pin.
  • Observations will be telescopic and can be recorded either visually (V), or electronically/ or photographically (E).
  • The galaxies can be located manually (M), with digital setting circles or Go-To telescopes (D).  Remote telescopes are allowed.
  • For Visual observations, log sheets must contain:
    • Date and Time
    • Latitude and Longitude of the observation.
    • Sky conditions: transparency and seeing.
    • Telescope aperture and focal length.
    • Whether the object was found manually, with digital setting circles or a Go-To telescope.
    • Magnification
    • The Revised Flat Galaxy Catalogue (RFGC) number of the galaxy observed.
    • Observing details and descriptions.
    • Position angle of the Flat Galaxy (from 0° [North-South]– 179°
  • Photographic or digital imaging observations, the image:
    • Must include the requirements for Visual Observing
    • Should have the estimated position angle (P.A.).
    • In addition, log sheets should contain the type of camera used.

Rules and Regulations

  • The log sheets and electronic files containing digital images (which can be submitted on a CD or flash drive, or through an internet-based delivery system, e.g., web site, Drop Box, Google Drive) can either be sent to the Program Coordinator or a club officer for review and approval.
  • You must be a member of the Astronomical League in good standing, either through an affiliated society or as a Member at Large.



Appendix A: a list of flat galaxies by Right Ascension (Excel Spreadsheet) (pdf)
Appendix B: a list of flat galaxies by constellation (Excel Spreadsheet) (pdf)
Appendix C: a list of flat galaxies 'above -30°  Declination’ (Excel spreadsheet) (pdf)



  1. Flat Galaxy Catalogue, Karachentsev, I.D., Karachentseva, V.E. and Parnovsky, S.L. Astronomische Nachrichten 313: 97-222, 1993.
  2. The Revised Flat Galaxy Catalogue, Karachentsev, I.D., Karachentseva, V.E., Kudrya, Y.N., Sharina, M.E. and Parnovsky, S.L. Bull. Spec. Astrophys. Obs. 47: 5-185, 1999.


We would like to thank the members of the Delaware Valley Amateur Astronomers: John Bajtelsmit, Mark Huss, Vince Scheetz who assisted in the development of this Observing Program and Dick Steinberg who imaged the flat galaxies used on the certificates.


Submitting for Certification

To receive your certification, you may either submit your completed logs with required information to the Flat Galaxy Observing Program Coordinator, or have them reviewed and approved by an officer of your astronomy club.  They should contact the Observing Program Coordinator with your information via email.

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


Flat Galaxies Observing Program Coordinator:

Al Lamperti
112 Pebble Beach Drive
Royersford, PA 19468



Find your Flat Galaxies Program Award