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HIP 99770
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Star HIP 99770

White-Blue star HIP 99770 is located 133 light years away from the Sun. It is a single star of spectral class kA1.5hA7mA0.5 λ, that has 185 % of solar mass. There is at least one exoplanet in this system.
Sun distance
133 light years
galaxy map

HIP 99770

White-Blue star
Spectral class: kA1.5hA7mA0.5 λ

Location +

Ascension iconRight ascension: 20h 14m 32.037s
Declination iconDeclination: 36° 48' 22.701'' (northern hemisphere)
Parallax iconParallax: 24.546
Distance iconSun distance: 132.878 ly | 40.7 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: 185 % M Sun
| 1938 M Jupiter
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Star mass
Mass of the star HIP 99770 is 1.85 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: 170 % R Sun
| 16.9 R Jupiter
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Star size
Radius of the star HIP 99770 is 1.7 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: 8000 K | 1.38 T Sun
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Star temperature
Surface temperature of HIP 99770 is 8000 K, which is 138 % 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: 13.86 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): 5
Magnitude iconAbsolute magnitude (V): 1.9
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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HIP 99770 system structure

 HIP 99770
HIP 99770 b 16.9 AU 5118.3 M⊕ -

More about HIP 99770

Star HIP 99770 is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 70 % bigger than the Sun and temperature on its surface is around 8000 K (7727 °C), which is about 138 % of Sun's temperature.
       HIP 99770 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
b03 Cyg, 29 Cygni, HD 192640, HR 7736, IRAS 20126+3639, 2MASS J20143203+3648225, SAO 69678, TIC 10988057, TYC 2683-3962-1, V1644 Cyg, WISEA J201432.07+364823.7
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External sources
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News from this star system

JWST images reveal CO2 and high metallicity in super-Jupiter 29 Cyg b, hinting at disk formation
Image: JWST images reveal CO2 and high metallicity in super-Jupiter 29 Cyg b, hinting at disk formation
JWST images show CO2 and high metallicity in super-Jupiter 29 Cyg b, supporting formation in a protoplanetary disk. The planet's orbit is aligned with its star, revealing clues to giant planet origins....
14.4.2026
Read article >

Frequently Asked Questions stardetail

How far is the HIP 99770 system from the Sun?

The HIP 99770 system is 133 light years or 40.7 parsecs from the Sun.

What galaxy is the HIP 99770 star in?

The HIP 99770 is in the Milky Way galaxy just like the Sun.

How many stars are in the HIP 99770 system?

The HIP 99770 is a single star, there are no other known stars in the system.

What type of star is the HIP 99770?

The star HIP 99770 is a White-Blue star star.

What temperature is star HIP 99770?

The star HIP 99770 has an effective temperature of 8000 K. Find out more about the temperature of stars in Stellar guide
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