M84 (NGC 4374) Observing Guide — Lenticular Galaxy in Virgo

Overview

M84 is a lenticular galaxy in Virgo, catalogued as NGC 4374. At magnitude 9.1 and approximately 60 million light-years away, it lies at the heart of the Virgo Cluster alongside M86, forming one of the most recognizable galaxy pairs in the spring sky.

Lenticular galaxies have a disk-like structure without prominent spiral arms. M84 is notable for harboring one of the most massive black holes in the Virgo Cluster, and its radio-emitting jets make it an active galactic nucleus studied across multiple wavelengths.

Basic Data

Physical Characteristics

M84 lies about 60 million light-years away and glows at magnitude 9.1. Together with M86, it anchors the central region of the Virgo Cluster — the nearest large galaxy cluster to the Milky Way, and one of the richest hunting grounds in Messier's entire catalog.

Observing Guide

Finding It

M84 transits high in the south around 8–10 PM in spring. Its position just west of M86 makes the two galaxies easy to fit simultaneously in a low-power Eyepiece field. This pairing sits at the western end of Markarian's Chain, a curving arc of Virgo Cluster galaxies that makes for a memorable visual sweep.

Observing Tips

Use the lowest magnification your Eyepiece collection allows to frame M84 and M86 together. Both appear as elliptical patches of light; M84 tends to be slightly more circular than M86. Allow full dark-adaptation and observe from the darkest available site.

Recommended Equipment

A medium telescope with 80mm aperture or more is the minimum practical instrument. Under good Seeing with a 150mm or larger scope, the bright nucleus becomes quite prominent.

Astrophotography Tips

The M84/M86 pairing is one of the most frequently photographed galaxy pairs in the sky. An Equatorial mount, tracked exposures, and image stacking reveal both galaxies and a scattering of fainter cluster members in the same wide-field frame — a composition that captures the true density of the Virgo Cluster.

Summary

M84 in Virgo is an advanced target that combines naturally with its neighbor M86. Together they form the centerpiece of Markarian's Chain, a spring galaxy tour that rewards both visual observers and astrophotographers willing to push beyond the obvious showpiece objects.