Observe
1Physical Properties
Magnitude
4.60
Range
4.44 - 4.85
Period
43 days
Variable Type
Semi-Regular Variable (Late-type Giant)
Spectral Type
M4.5III
Star Color
Red
(B-V 1.59)
Distance
326 ly
2Position & Identifiers
RA
14h 57m 35.0s
Dec
+65° 55' 57.0"
Constellation
Ursa Minor
(UMi)
HR
5589
HIP
73199
HD
132813
Variable ID
RR UMi
Querying VizieR catalog...
3How easy to follow?
Magnitude
4.4 – 4.9 mag
Amplitude
0.4 mag
Period
43.3 d
Type
SRB
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 | Hard | Hard | V. hard+ |
| 50 mm finder 50mm finder | Hard+ | Hard+ | Hard+ |
| 150 mm telescope 150mm scope | Hard+ | Hard+ | Hard+ |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
Out of reach for typical amateur telescopes, even at Bortle 3.
4Visibility
Set a location in User Settings to see visibility data.
Best season
Mar – May
(peak: Apr)
5Light Curve
6Comparison Stars for RR UMi (4.4–4.8)
Nearby stable stars for estimating brightness (AAVSO)
Loading comparison stars…
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
SR? 6.17 - 6.5p, 40?d.
748.9d, K 8.3k/s, V0 +6.2k/s, asini 84.
Hyades group.
16
Light Travel Time Machine
17
Relativistic Travel
Survey Image
Loading survey image…
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
Variable Stars — A Guide for Observers
A practical guide to visual observation of variable stars: estimating magnitudes, finding comparison stars, recording data, and contributing to science with AAVSO.
Article
Ursa Minor
Mythology, bright stars, and deep-sky highlights.
Constellation
