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21 Leonis Minoris — Star in Leo Minor

Magnitude 4.5m Star Leo Minor (LMi) Visible
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1Physical Properties

Magnitude 4.48
Variable Type Delta Scuti (Pulsating)
Spectral Type A7V
Star Color Yellow-white (B-V 0.18)
Distance 65 ly

2Position & Identifiers

RA 10h 07m 25.8s
Dec +35° 14' 41.0"
Constellation Leo Minor (LMi)
HR 3974
HIP 49593
HD 87696
SAO 61874
Flamsteed 21 LMi
SIMBAD

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 Jan – Mar (peak: Feb)

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

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15Stellar Notes

Delta Sct? 4.47 - 4.52V, about 0.1d.
Sirius group; UMa stream.
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 3067
Hard+
Bright spiral galaxy
Galaxy mag 11.7 3.4° Leo
Tania Australis
HIP 50801; Mu Ursae Majoris; 34 Ursae Majoris
Hard+
Eclipsing binary, period 230.1d
Variable Star mag 3.05 6.9° Ursa Major
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Biography
Leo Minor
Mythology, bright stars, and deep-sky highlights.
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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.
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