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HD 189733
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Star HD 189733

Binary star HD 189733 is located 64 light years away from the Sun. It consists of a orange star and a red dwarf. There is at least one exoplanet in this system.
Sun distance
64 light years

HD 189733 A

Orange star (spectral class K2V C)
BY Draconis variable

Location

Ascension iconRight ascension: 20h 0m 43.716s
Declination iconDeclination: 22° 42' 35.068'' (northern hemisphere)
Parallax iconParallax: 50.567
Distance iconSun distance: 64.5 ly | 19.8 pc

Basic characteristic

icon weight
Mass: 80.6 % M Sun | 844 M Jupiter
radius icon
Size: 81 % R Sun | 8 R Jupiter
temperature iconTemperature: 4875 K | 0.84 T Sun
time iconAge: 0.6 billions years | 0.13 Sun
luminosity iconLuminosity: 0.328 L Sun

1 exoplanet

HD 189733 A b 0.03 AU 361.8 M 12.8 R 2.2 days

Photometry

Magnitude iconApparent magnitude (V): 7.7
Magnitude iconAbsolute magnitude (V): 6.2
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
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).

HD 189733 B

Red dwarf (spectral class M4V)
BY Draconis variable

Location

Distance iconDistance from the primary: 216 AU

Basic characteristic

icon weight
Mass: 30 % M Sun | 261.9 M Jupiter (estimate)
radius icon
Size: 30 % R Sun | 2.7 R Jupiter (estimate)
(No known exoplanets yet)

Photometry

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
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
More about HD 189733
      a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface. HD 189733 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. 
HD 189733 is a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface.
Other designations of this star
V452 Vulpeculae, BD+22 3887, Gaia DR2 1827242816201846144, Gliese 4130, GJ 4130, HIP 98505, SAO 88060, LTT 15851, NLTT 48568, Wolf 864, TYC 2141-972-1, 2MASS J20004370+2242391, Gaia DR3 1827242816201846144
External sources
simbad icon
Simbad database (UCAC3 226-217434)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia DR3 1827242816176111360)
Archive from the Gaia mission
News from this star system
Article image:

X-ray variability of star HD 189733 is different from variability in its optical spectrum

Star HD 189733 is flaring in half of its observations. Astronomers also found out that the variability is significantly different in different parts of the electromagnetic spectrum.

Closest stars

Gaia DR3 2026640967853712000
- 3.4 ly

2MASS J2005+1911
- 4.2 ly

Gaia DR3 2020972985439046016
- 4.9 ly

Gaia DR3 2020935705110296448
- 5 ly

Gaia EDR3 1828661426704706048
- 5.5 ly
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