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Ross 644
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Star Ross 644

Orange star Ross 644 is located 65 light years away from the Sun. It is a single star of spectral class K7V, that has typically about 70 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
65 light years
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Ross 644

Orange star, High proper motion star
Spectral class: K7V

Location +

Ascension iconRight ascension: 16h 54m 11.442s
Declination iconDeclination: 11° 54' 57.918'' (equatorial region)
Parallax iconParallax: 49.801
Distance iconSun distance: 65.492 ly | 20.1 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: 70 % M Sun
| 712.3 M Jupiter
 (estimate)
+
Star mass
The mass of the star Ross 644 is unknown. Based on its other characteristics, it is estimated to be about 70 % of the Sun's mass.

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 Ross 644 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 iconTemperature: 4100 K
 (estimate)
+
Star temperature
Surface temperature of Ross 644 is estimated to be 4062 K, which is 71 % 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

Photometry

Magnitude iconApparent magnitude (V): 10.7
Magnitude iconAbsolute magnitude (V): 9.2
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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Ross 644 system structure

 Ross 644

More about Ross 644

Nearby star Ross 644 is a main sequence star that fuses hydrogen atoms into helium. 
       Ross 644 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
Gaia EDR3 4448223656247483904
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External sources
simbad icon
Simbad database (Ross 644)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 4448223656247483904)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Ross 644 system from the Sun?

The Ross 644 system is 65 light years or 20.1 parsecs from the Sun.

What galaxy is the Ross 644 star in?

The Ross 644 is in the Milky Way galaxy just like the Sun.

How many stars are in the Ross 644 system?

The Ross 644 is a single star, there are no other known stars in the system.

What type of star is the Ross 644?

The star Ross 644 is a Orange star star.

What temperature is the Ross 644?

The primary in the Ross 644 system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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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.
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