do not follow here
Stellar Catalog more icon Nearby stars catalogue more icon
70 Ophiuchi
more icon

Star 70 Ophiuchi

Binary star 70 Ophiuchi is located 17 light years away from the Sun. It consists of 2 orange star stars. For now, there are no known exoplanets in this star system.
Loading 3D model
Nearby stars catalogue
Sun distance
17 light years
galaxy map

70 Ophiuchi A

Orange star, Rotating Variable
Spectral class: K0-V

Location +

Ascension iconRight ascension: 18h 5m 27.473s
Declination iconDeclination: 2° 29' 42.807'' (equatorial region)
Parallax iconParallax: 195.567
Distance iconSun distance: 16.677 ly | 5.1 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: 90 % M Sun
| 943 M Jupiter
+
Star mass
Mass of the star 70 Ophiuchi A is 0.9 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: 91 % R Sun
| 9.1 R Jupiter
+
Star size
Radius of the star 70 Ophiuchi A is 0.91 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: 5419 K | 0.94 T Sun
+
Star temperature
Surface temperature of 70 Ophiuchi A is 5419 K, which is 94 % 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
time icon
Age: 1.9 billions years | 0.41 Sun
+
Star age
Star 70 Ophiuchi A is 1.9 billion years old, which is about 0.41 of the Sun's age.

The age of a star tells us how long it has been shining since it formed. Knowing a star’s age helps astronomers understand its life stage, how it has changed over time, and what will happen to it in the future... icon More about Star age in StellarGuide
luminosity icon
Luminosity: 0.59 L Sun
+
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): 4
Magnitude iconAbsolute magnitude (V): 5.5
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

70 Ophiuchi B

Orange star, High proper motion star
Spectral class: K4 V

Basic characteristic

icon weight
Mass: 70 % M Sun
| 733 M Jupiter
+
Star mass
Mass of the star 70 Ophiuchi B is 0.9 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: 70 % R Sun
| 6.7 R Jupiter
(estimate)
+
Star size
Radius of the star 70 Ophiuchi B is not known. Its estimated value based on other similar stars is about 70 % 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: 4393 K | 0.76 T Sun
+
Star temperature
Surface temperature of 70 Ophiuchi B is 4393 K, which is 76 % 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: 0.13 L Sun
+
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): 6.1
Magnitude iconAbsolute magnitude (V): 7.5
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
Advertisement

70 Ophiuchi system structure

 70 Ophiuchi A
70 Ophiuchi B

More about 70 Ophiuchi

       70 Ophiuchi can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
LHS 459, Gliese 702, GJ 702, LHS 458, V2391 Ophiuchi, BD+02 3482, HD 165341, HIP 88601, HR 6752, PLX 4137, 70 Oph, Gaia EDR3 4468557611984384512
Advertisement
External sources
icon study
icon study
simbad icon
Simbad database (* 70 Oph B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 4468557611977674496)
Archive from the Gaia mission

News from this star system

70 Ophiuchi and 36 Ophiuchi binary systems show potential for supporting stable habitable planets
Image: 70 Ophiuchi and 36 Ophiuchi binary systems show potential for supporting stable habitable planets
70 Ophiuchi and 36 Ophiuchi binary systems show potential to host stable, habitable planets. Numerical simulations suggest these systems are strong candidates for future habitability studies, while Gamma Leonis appears unlikely to support such environments....
23.8.2026
Read article >
A century of monitoring 70 Ophiuchi AB rules out giant planets, but habitable Saturns remain possible
Image: A century of monitoring 70 Ophiuchi AB rules out giant planets, but habitable Saturns remain possible
A century of monitoring 70 Ophiuchi AB rules out giant planets, but Saturn-mass or smaller worlds could still exist in the habitable zone, making it a prime target for future planet searches....
23.3.2026
Read article >

Frequently Asked Questions

How far is the 70 Ophiuchi system from the Sun?

The 70 Ophiuchi system is 17 light years or 5.1 parsecs from the Sun.

What galaxy is the 70 Ophiuchi star in?

The 70 Ophiuchi is in the Milky Way galaxy just like the Sun.

How many stars are in the 70 Ophiuchi system?

The 70 Ophiuchi system contains 2 stars.

What type of star is the 70 Ophiuchi?

The primary in the 70 Ophiuchi system is a Orange star star.

What temperature is star 70 Ophiuchi?

The primary in the 70 Ophiuchi system has a temperature of 5419 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 Gliese 752
 0.46 M☉ 6.2 ly

WISE 1741+2553
 0 M☉ 7.6 ly

Gaia DR2 4129144660321847040
 - 7.6 ly

Altair
 1.8 M☉ 7.8 ly

Wolf 1061
 0.25 M☉ 7.9 ly
3D map of stellar neighborhood
List of all nearby stars
Advertisement

exoplanet iconAbout Stellar Catalog

line
Working with real data
icon Data in Stellar Catalog come from trusted scientific sources. Primary source is Gaia space telescope mapping the stars in Milky Way. Other sources include research papers, Simbad catalog and Exoplanet.eu database.
Estimated values
icon Objects listed in the Stellar Catalog often have values that are estimates. These estimates are determined using their known characteristics, such as spectral type, brightness across different wavelengths, distance from a star, and other factors.
Fresh and validated
icon Stellar Catalog is continuously updated with new information from research papers. Stellar and planetary data are validated by automatic processes as well as humans.
Get your next news from nearby stars
Stellar Catalog brings the stars from our galaxy to you. Discover their position, physical properties and whether there are any exoplanets or disks orbiting them. The data in Stellar Catalog come from respectable sources like Gaia space telescope, or SIMBAD database.
Visit Stellar catalog on Facebook
Visit profile on X

Advertisement