HIP 102431 — Star in Cepheus
Observe
1Physical Properties
Magnitude
4.51
Spectral Type
F8IV-V
subgiant
Star Color
Yellow
(B-V 0.54)
Distance
71 ly
2Position & Identifiers
RA
20h 45m 21.1s
Dec
+57° 34' 47.0"
Constellation
Cepheus
(Cep)
HR
7955
HIP
102431
HD
198084
SAO
32862
Querying VizieR catalog...
3How easy to spot?
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| 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
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Best season
Jun – Aug
(peak: Jul)
5Survey Image
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6
Size Comparison
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7
Compare Stars
8
Spectral Classification
9
Hertzsprung-Russell Diagram
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10
Stellar Lifecycle
11
Blackbody Spectrum
12
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
13
Stellar Fusion
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14Stellar Notes
B is BD+57d2241, optical.
Labelled Upsilon Cep in Burritt's Atlas, not confirmed elsewhere. It is not the double star described by Allen as | Castula, Upsilon1,2 Cep.
15
Light Travel Time Machine
16
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 6946
Bright spiral galaxy
Galaxy
mag 8.9
2.9°
Cepheus
NGC 6939
Open cluster
Open Cluster
mag 7.8
3.6°
Cepheus
Alderamin
HIP 105199; Alpha Cephei; 5 Cephei
Bright naked-eye star, mag 2.4
Star
mag 2.44
6.5°
Cepheus
V1143 Cyg
Eclipsing binary, period 7.6d
Variable Star
mag 5.82
9.6°
Cygnus
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