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Pi Pegasi — Star in Pegasus

HIP 109410; Pi Pegasi; 29 Pegasi

Magnitude 4.3m Star Pegasus (Peg) Visible
Star Map
+ List + Plan

Observe

1Physical Properties

Magnitude 4.29
Spectral Type F5III giant
Star Color Yellow (B-V 0.46)
Distance 466 ly

2Position & Identifiers

RA 22h 09m 59.2s
Dec +33° 10' 42.0"
Constellation Pegasus (Peg)
HR 8454
HIP 109410
HD 210459
SAO 72077
Bayer Pi
Flamsteed 29 Peg
SIMBAD Wikipedia

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium+ Medium
50mm finder Easy Easy Easy
150mm scope Easy Easy Easy
Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Jul – Sep (peak: Aug)

5Survey Image

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7

Size Comparison

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8

Compare Stars

9

Spectral Classification

10

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
11

Stellar Lifecycle

12

Blackbody Spectrum

13

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

14

Stellar Fusion

Discover

15Stellar Notes

Sirius group; UMa stream.
Shell star.
16

Light Travel Time Machine

17

Relativistic Travel

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

NGC 7217
Hard
Bright spiral galaxy
Galaxy mag 10.2 1.9° Pegasus
V460 Cyg
Easy
Semi-regular variable, range 5.6–7.0
Variable Star mag 6.07 6.2° Cygnus
Mu Cyg
Mu Cyg (BS8309)
Hard+
Tight double — a rewarding split at 1.4″
Double Star mag 4.73 7.1° Cygnus
NGC 7063
Easy
Open cluster
Open Cluster mag 7.0 9.9° Cygnus
Show on Map

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1919 eclipse expedition confirming general relativity; first theory of stellar interiors; the Eddington limit
Biography
The Hertzsprung-Russell Diagram — Reading Stars Like a Map
The HR diagram turns the night sky into a physics map: every named star has a spot, every spot tells you mass, age, and fate. A guide for amateur observers.
Article
Pegasus
Mythology, bright stars, and deep-sky highlights.
Constellation
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