M105 (NGC 3379) Observation Guide — The Elliptical Galaxy in Leo

Overview

M105 is an elliptical galaxy located in the constellation Leo, also cataloged as NGC 3379. At an apparent Magnitude of 9.3 and roughly 380,000 light-years from Earth, it becomes well-positioned for observation during spring evenings — though it is best suited for experienced observers.

Elliptical galaxies have a smooth, rounded shape and are composed primarily of older stars. They contain very little interstellar gas or dust, which means new star formation has essentially ceased.

Key Data

Physical Characteristics

This galaxy sits approximately 380,000 light-years away, shining at an apparent Magnitude of 9.3.

The universe is thought to contain hundreds of billions of galaxies, but those listed in the Messier catalog are among the brighter ones — making them accessible targets for amateur astronomers with modest telescope setups.

Observation Guide

How to Find It

M105 lies within the boundaries of Leo. It transits around 8:00 to 10:00 PM during spring, placing it at a convenient altitude for observation. Start by identifying Leo's prominent stars, then use a star chart or planetarium app to pinpoint the exact location.

Tips for Observing

Dark skies and a telescope with good aperture make a significant difference when hunting galaxies. Use low magnification to keep the field of view wide, and give your eyes plenty of time to dark-adapt before you begin searching.

Recommended Equipment

A medium-aperture telescope is the way to go for this target. An instrument with at least 80 mm of aperture under dark skies will give you the best chance of picking it up.

Astrophotography Tips

M105 is a rewarding astrophotography subject. Tracking with an Equatorial mount is essential — raise the ISO and take long exposures (30 seconds to several minutes) to reveal structural details invisible to the naked eye. Stacking multiple frames will reduce noise and produce a cleaner final image.

Wrapping Up

M105 is an elliptical galaxy in Leo that rewards patient, skilled observers. You will need a reasonably large telescope, but the effort pays off. When spring skies clear, give this one a try.