47 Piscium — Variable Star in Pisces
Excellent (71/100)
Observe
1Physical Properties
Magnitude
5.06
Range
4.65 - 5.42
Period
49 days
Variable Type
Semi-Regular Variable
Spectral Type
M3III
giant
Star Color
Red
(B-V 1.65)
Distance
204 ly
2Position & Identifiers
RA
00h 28m 02.9s
Dec
+17° 53' 35.0"
Constellation
Pisces
(Psc)
HR
103
HIP
2219
HD
2411
SAO
91910
Flamsteed
47 Psc
Variable ID
TV Psc
Querying VizieR catalog...
3How easy to follow?
Magnitude
4.7 – 5.4 mag
Amplitude
0.8 mag
Period
49.1 d
Type
SR
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 | Medium+ | Medium | Medium |
| 150 mm telescope 150mm scope | Medium+ | Medium+ | Medium+ |
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
Aug – Oct
(peak: Sep)
5Survey Image
Loading survey image…
6Light Curve
7Comparison Stars for 47 Psc (4.7–5.4)
Nearby stable stars for estimating brightness (AAVSO)
Loading comparison stars…
Explore
8
Size Comparison
Querying VizieR for stellar data…
9
Compare Stars
10
Spectral Classification
11
Hertzsprung-Russell Diagram
Loading HR diagram…
12
Stellar Lifecycle
13
Blackbody Spectrum
14
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
15
Stellar Fusion
Discover
16Stellar Notes
SR 4.65 - 5.42V, 49d, replaced by cycles 70 - 85d.
Zeta Her group; Hyades group.
17
Light Travel Time Machine
18
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
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
Pisces
Mythology, bright stars, and deep-sky highlights.
Constellation
