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Eta Serpentis
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Star Eta Serpentis

Red giant Eta Serpentis is located 62 light years away from the Sun. It is a single star of spectral class K0III-IV, that has 200 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
62 light years
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Eta Serpentis

Red giant, High proper motion star
Spectral class: K0III-IV

Location +

Ascension iconRight ascension: 18h 21m 18.017s
Declination iconDeclination: -2° 54' 6.994'' (equatorial region)
Parallax iconParallax: 52.441
Distance iconSun distance: 62.194 ly | 19.1 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 200 % M Sun
| 2095 M Jupiter
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Star mass
Mass of the star Eta Serpentis is 2.0 solar masses.

The mass of a star is the total amount of matter it contains. It is one of the most important properties of a star, as it determines almost everything about how the star lives, changes, and dies. In astronomy, star mass is usually measured in solar masses (M☉) — where 1 solar mass is equal to the mass of our Sun... icon More about Star mass in StellarGuide
radius icon
Size: 590 % R Sun
| 58.7 R Jupiter
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Star size
Radius of the star Eta Serpentis is 5.897 solar radii.

The size of a star refers to its radius — the distance from its center to its surface. Star size is usually measured in solar radii (R☉), where 1 solar radius equals approximately 696,000 kilometers. Depending on their type and life stage, stars can be much smaller or larger than the Sun... icon More about Star size in StellarGuide
temperature icon
Temperature: 4962 K | 0.86 T Sun
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Star temperature
Surface temperature of Eta Serpentis is 4962 K, which is 86 % of the temperature on the surface of the Sun.

The temperature of a star refers to the temperature at its surface, also called the photosphere. It is measured in kelvins (K), the standard unit for temperature in astronomy. A star’s temperature tells us a lot about its physical properties and where it stands in its evolutionary stage... icon More about Star temperature in StellarGuide
luminosity icon
Luminosity: 19 L Sun
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Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide

Photometry

Magnitude iconApparent magnitude (V): 3.3
Magnitude iconAbsolute magnitude (V): 1.8
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3
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Eta Serpentis system structure

 Eta Serpentis

More about Eta Serpentis

Nearby star Eta Serpentis is is approximately 6 times bigger than the Sun and temperature on its surface is around 4962 K (4689 °C), which is about 86 % of Sun's temperature.
       Eta Serpentis can be found in southern celestial hemisphere, and it is possible to see it with naked eye. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
58 Serpentis, BD−02° 4599, HD 168723, HIP 89962, HR 6869, SAO 142241, LHS 3381, FK5 688, GJ 711, Gliese 711, LFT 1409, LTT 7300, NLTT 46332, 2MASS J18211862-0253554, TIC 168775356, TYC 5102-416-1, WDS J18213-0254A, eta Ser, Gaia DR3 4269932382607207040
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External sources
simbad icon
Simbad database (* eta Ser)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia DR3 4269932382607207040)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Eta Serpentis system from the Sun?

The Eta Serpentis system is 62 light years or 19.1 parsecs from the Sun.

What galaxy is the Eta Serpentis star in?

The Eta Serpentis is in the Milky Way galaxy just like the Sun.

How many stars are in the Eta Serpentis system?

The Eta Serpentis is a single star, there are no other known stars in the system.

What type of star is the Eta Serpentis?

The star Eta Serpentis is a Red giant star.

What temperature is star Eta Serpentis?

The star Eta Serpentis has an effective temperature of 4962 K. Find out more about the temperature of stars in Stellar guide
Class of stars Red giant
White dwarfs are the hot, extremely dense stellar remnants left behind by stars that originally had masses between about 0.5 and 8 times the mass of the Sun during their main sequence lifetimes. After exhausting their nuclear fuel, these stars shed their outer layers and leave behind a compact core. Although white dwarfs contain between roughly 0.2 and 1.44 solar masses, this mass is packed into a volume comparable to that of an Earth-sized planet, making them some of the densest objects in the Universe.
Closest stars

 Gliese 710
 0.57 M☉ 1.1 ly

Gliese 715
 - 2.7 ly

PM J18306-0356
 - 3.4 ly

UCAC4 440-076127
 - 4.1 ly

Gaia EDR3 4271449399422291712
 - 4.6 ly
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