Observe
1Physical Properties
Magnitude
4.04
Range
4.0 - 4.05
Period
2.0 hours
Variable Type
Delta Scuti (Low Amplitude)
Spectral Type
F2II-III
bright giant
Star Color
Yellow-white
(B-V 0.33)
Distance
99 ly
2Position & Identifiers
RA
04h 11m 51.9s
Dec
-06° 50' 15.0"
Constellation
Eridanus
(Eri)
HR
1298
HIP
19587
HD
26574
SAO
131019
Flamsteed
38 Eri
Variable ID
Omi1 Eri
Querying VizieR catalog...
3How easy to spot?
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and configure your equipment and default location to see a personalized row.
| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Easy | 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
Oct – Dec
(peak: Nov)
5Survey Image
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Explore
7
Size Comparison
Querying VizieR for stellar data…
8
Compare Stars
9
Spectral Classification
10
Hertzsprung-Russell Diagram
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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
Delta Sct 4.00 - 4.05V, 0.0815d. Secondary per. 0.1291d.
Beid.
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
Eridanus
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
