During the spring months, amateur astronomers in the Northern Hemisphere often turn their attention toward the season’s brighter galaxies. One of the finest is NGC 2903, a galaxy in Leo that somehow escaped inclusion in Charles Messier’s famous catalog.
Had Pierre Méchain or Messier swept just slightly differently across this region in the 1780s, NGC 2903 likely would have earned a Messier number. Instead, William Herschel gets the credit for discovering the galaxy and cataloging it on November 16, 1784.
In many ways, NGC 2903 feels like a familiar face. Like our own Milky Way, it is a barred spiral galaxy of similar size and structure, with a central bar, sweeping spiral arms, and active regions of star formation scattered throughout its disk.
Yet there are differences worth noting. NGC 2903 shows unusually intense star-forming activity near its nucleus. Its central bar acts like a funnel, gravitationally herding gas and dust inward. When that material piles up, it reaches the densities needed to trigger rapid star formation.
All of this is unfolding at a distance of roughly 30 million light-years. That alone is a humbling reminder of how vast the cosmos truly is, and it makes the view through the eyepiece all the more rewarding.
My Observations
Observed on March 22, 2026, at 12:50 a.m. from Tampa, Florida
This evening I reached for the Seestar S50 rather than my SCT, and pointed it toward NGC 2903 in Leo. The image below shows what the galaxy looks like through a small smart telescope from suburban skies.
For observers using a 6–8 inch scope under similar conditions, expect a moderately bright, elongated glow with a noticeably brighter core. It is a satisfying find, but the finer details remain hidden. To begin pulling out the spiral arms and more subtle structure, darker skies and an aperture of 10 inches or more will make a real difference.
Tampa, Florida, March 22, 2026.
| Constellation | Leo |
| Best Viewing | Spring |
| Visual Magnitude | +8.9 |
| Absolute Magnitude | -21.06 |
| Distance from Earth | 30 million light-years |
| Diameter | 105,500 ly |
| Apparent Size | 11.9 x 5.3 arcminutes |
| Milky Way Location | NA |
| My Viewing Grade | B |
| Designations | NGC 2903, UGC 5079, PGC 27077, H I.56 |
Sources and Notes
Astronomy Magazine. (2014, February 27). Regulus, Bode’s galaxy (M81), and spiral galaxy NGC 2903. Astronomy. https://www.astronomy.com/science/regulus-bodes-galaxy-m81-and-spiral-galaxy-ngc-2903/
Wikipedia contributors. (2025, May 30). NGC 2903. Wikipedia. https://en.wikipedia.org/wiki/NGC_2903
The Garden Astronomer 