Star · G9 V

HD 191939

HD 191939 is a main-sequence star of spectral type G9 V in the constellation Draco, 174.4 light-years from the Sun. It is orbited by 6 confirmed exoplanet(s).

Other names	HIP 99175
Constellation	Draco
Distance	174.4 light-years (53.5 pc)
Apparent magnitude	magnitude 8.97
Absolute magnitude	magnitude 5.33
Spectral type	G9 V
Surface temperature	5,350 K
Luminosity	0.65 L☉
Radius	0.94 R☉
Mass	0.81 M☉
Age	8.7 billion years
Metallicity [Fe/H]	-0.15
Right ascension (J2000)	20h 08m 05.7s
Declination (J2000)	+66° 51′ 02″
Space velocity (relative to the Sun)	42.4 km/s

In the sky

Too faint for the naked eye (magnitude 8.97); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 23° S. North of latitude 23° N it never sets. It stands highest at midnight in July, the best time to observe it.

Through a telescope from Earth

Light's journey

The light you see tonight set out around the year 1852. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.1 million years.

The Sun seen from there

From a planet around HD 191939, the Sun would look like a star of magnitude 8.47, in the direction where our sky has the constellation Volans. It would be invisible to the naked eye.

Planets

HD 191939 b 8.88-day orbit · 3.41 R⊕
HD 191939 c 28.6-day orbit · 3.2 R⊕
HD 191939 d 38.4-day orbit · 3 R⊕
HD 191939 e 101-day orbit · 13 R⊕
HD 191939 g 284-day orbit · 3.74 R⊕
HD 191939 f 2,900-day orbit · 13.2 R⊕

Neighbours

Its nearest neighbours in the catalogue (within 20 light-years):

2MASS J19415458+6826021 10.1 light-years
HIP 98245 13.2 light-years
HIP 102500 13.5 light-years
HIP 97399 13.8 light-years
HIP 96512 14.6 light-years
66 Dra 15.0 light-years
2MASS J19495702+6222440 15.8 light-years
HIP 98874 19.4 light-years

Open in the simulation

Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.