Epsilon Ursae Minoris — Star in Ursa Minor
Observe
1Physical Properties
Magnitude
4.23
Range
4.19 - 4.23
Period
39 days
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
G5III
giant
Star Color
Orange
(B-V 0.89)
Distance
326 ly
2Position & Identifiers
RA
16h 45m 58.1s
Dec
+82° 02' 14.0"
Constellation
Ursa Minor
(UMi)
HR
6322
HIP
82080
HD
153751
SAO
2770
Bayer
Epsilon
Flamsteed
22 UMi
Variable ID
Eps UMi
Double Cat
10242
Querying VizieR catalog...
3How easy to spot?
Sign in
and configure your equipment and default location to see a personalized row.
| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Medium+ | Medium+ | Medium |
| 50 mm finder 50mm finder | Easy | Easy | Easy |
| 150 mm telescope 150mm scope | Easy | Easy | Easy |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
Set a location in User Settings to see visibility data.
Best season
Apr – Jun
(peak: May)
5Survey Image
Loading survey image…
Explore
7
Size Comparison
Querying VizieR for stellar data…
8
Compare Stars
9
Spectral Classification
10
Hertzsprung-Russell Diagram
Loading HR diagram…
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
EA 4.22 - 4.28V, 39.4809d.
39.4809d, K 31.8k/s, V0 -10.6k/s, asini 17.3.
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.
Explore Nightbase
Related knowledge, tools, and stories — no observation planning required.
Arthur Eddington
1919 eclipse expedition confirming general relativity; first theory of stellar interiors; the Eddington limit
Biography
Ursa Minor
Mythology, bright stars, and deep-sky highlights.
Constellation
The Life of Stars
From birth in a nebula to spectacular death — how stars are born, shine, swell, and die, and how to read the clues in their starlight.
Article
