iconstars iconexoplanets iconstudies
do not follow here
Stellar Catalog
more icon
Nearby stars catalogue
more icon
70 Ophiuchi B
more icon

Star 70 Ophiuchi B

Orange star 70 Ophiuchi B is located 17 light years away from the Sun. It is a single star of spectral class K4 V, that has 70 % of solar mass. For now, there are no known exoplanets in this star system.
Sun distance
17 light years
galaxy map

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 0.7 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
More about 70 Ophiuchi B
70 Ophiuchi B is approximately 70 % of the size of Sun and temperature on its surface is around 4393 K (4120 °C), which is about 76 % of Sun's temperature.
       70 Ophiuchi B can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
LHS 459, Gaia EDR3 4468557611977674496
External sources
icon study
Three Hot Jupiters transiting K-dwarfs with a significant heavy element mass
Scientific study, Accepted: 05. 06. 2025
icon study
Searching for helium escape and a low density atmosphere around the 120 Myr old sub-Neptune HIP94235b using CRIRES+
Scientific study, Accepted: 04. 06. 2025
icon study
The Age and High Energy Environment of the Very Young Transiting Exoplanet TOI 1227b
Scientific study, Accepted: 04. 06. 2025
icon study
NLTE atmospheric modelling of the ultra-hot Jupiter WASP-178b and comparison with UV and optical observations
Scientific study, Accepted: 03. 06. 2025
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
calendar icon20. 03 2023
tag iconStars
Article image:

Astronomers have discovered a brown dwarf orbiting the red giant HD 18438

Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.

Read more
calendar icon09. 03 2023
tag iconExoplanets
Article image:

Newly discovered exoplanet HD 207496 b is too close to its star and is loosing atmosphere

Read more
calendar icon03. 03 2023
tag iconExoplanets
Article image:

Two giant exoplanets discovered orbiting nearby Sun-like star HIP 104045

Astronomers discovered two new exoplanets orbiting a star HIP 104045. The star is 175 light years away and its mass and size are similar to the Sun. Both exoplanets are gas giants, smaller than Jupiter.

Read more
calendar icon08. 02 2023
tag iconBrown dwarfs
Article image:

Astronomers used JWST and TESS telescopes to study nearby brown dwarf HD 19467 B

Brown dwarfs are objects between planets and stars. Astronomers divide them into 3 categories according to their temperature - L, T, Y. Their relatively low temperatures and brightness allow them to stay hidden for most part. Only the most powerful infrared telescopes are able to see them and that is where James Webb Space Telescope comes in.

Read more

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.
Stellar catalog: Discover the nearby universe
Visit profile on X