ANDROMEDA

Overview

Andromeda is a prominent autumn constellation connected to the Great Square of Pegasus. Its brightest star, Alpheratz, marks the northeast corner of the Great Square and was historically shared between Andromeda and Pegasus. Today it belongs solely to Andromeda.

The constellation's crowning jewel is the Andromeda Galaxy (M31), a vast spiral galaxy roughly 2.5 million light-years away. It is one of the farthest objects visible to the naked eye — a faint, fuzzy patch on clear, dark nights. Binoculars reveal its impressive extent.

Almach (γ And) is a celebrated double star whose gold and blue components make a striking contrast through a small telescope. Mirach (β And) is an orange-red giant that stands out clearly in the chain of stars.

How to Find It

On autumn evenings (October through December), locate the Great Square of Pegasus. The northeast corner is Alpheratz. From there, a graceful arc of three bright stars — δ And, Mirach (β), and Almach (γ) — extends toward the northeast.

To find the Andromeda Galaxy (M31), hop two stars northward from Mirach. Under dark skies it is visible to the naked eye; binoculars show its elliptical glow clearly.

Mythology and Culture

In Greek mythology, Andromeda was an Ethiopian princess. Her mother Cassiopeia boasted that she was more beautiful than the Nereids, sea nymphs of Poseidon. As punishment, Poseidon sent the sea monster Cetus to ravage Ethiopia. To appease the monster, Andromeda was chained to a coastal rock as a sacrifice.

The hero Perseus arrived, slew the monster, and freed Andromeda. The two wed and were eventually placed among the stars. Together with neighboring Perseus and Cassiopeia, the full drama of this myth plays out across the autumn sky.

Star Trivia

Alpheratz (α And) — About 97 light-years away, magnitude 2.07. A chemically peculiar Ap star of spectral type A0, it is a Mercury-Manganese star with heavy elements concentrated on its surface. Once designated delta Pegasi, it was shared between two constellations before being assigned exclusively to Andromeda.

Mirach (β And) — About 197 light-years away, magnitude 2.07. A red giant of type M0, Mirach glows with a warm orange hue. It is roughly 100 times the diameter of the Sun and is a mild variable star with strong infrared emission.

Almach (γ And) — About 355 light-years away, magnitude 2.10. A K-type giant that reveals itself as a stunning double star through a telescope — a gold primary paired with a blue companion. The system is actually a quadruple star.

Andromeda Galaxy (M31) — Located ~2.5 million light-years away, M31 is the largest galaxy in the Local Group, spanning over 200,000 light-years and containing hundreds of billions of stars. It is predicted to collide and merge with the Milky Way in about 4 billion years, and is the farthest object visible to the naked eye.

In Gravity Weaver

Andromeda is the seventeenth constellation, a 5-stage zone with a notably linear layout — Alpheratz, delta, Mirach, 51 And, and Almach in sequence.

The signature combo is Strong BH + Nebula. Along this long, directional path, slow-down clouds and high-mass black holes line up so that any loss of momentum tends to end in capture.

Use Slingshots to power through nebulae and chain Gravity Wells along detour arcs that stay well clear of the Strong BH. "NO GRAV BH" and "BH SIZE 1/2" items shine here.