725

Database links to Struve 2398

Double star
Struve 2398

Observation
dates equinox : J2000.0 , epoch : J2000.0

AladinLite

Dragon

18 ^h 42 ^m 46.7 ^s

+ 59 ° 37 ′ 50 ″

8.48 likes

Astrometry

Radial velocity

(−1.07 ± 0.09)
(1.09 ± 0.09) km / s

parallax

(283.95 ± 0.06)
(283.86 ± 0.11) mas

distance

(11.48 ± 0.01) Lj
(3.52 ± 0.01 pc )

Proper movement :

Rec. Share:

(−1311.91 ± 0.18)
(−1400.02 ± 0.32) mas / a

Dec. portion:

(1792.19 ± 0.22)
(1862.41 ± 0.39) mas / a

Individual data

Names

A; B.

Observation data:

Apparent brightness

A.

8.91 mag

B.

9.69 likes

Typing:

Spectral class

A.

M3.0 V

B.

M3.5 V

B − V color index

A.

(1.87)

B.

(2.02)

Physical Properties:

Dimensions

A.

(0.340 ± 0.007) M _☉

B.

(0.261 ± 0.006) M _☉

radius

A.

(0.347 ± 0.010) R _☉

B.

(0.281 ± 0.008) R _☉

Other names
and catalog entries

Bonn survey	BD + 59 ° 1915
Henry Draper Catalog	HD 173739	HD 173740
SAO catalog	SAO 31128	SAO 31129
Tycho catalog	TYC 3930-1791-1 [1]	TYC 3930-1791-2 [2]
Hipparcos catalog	HIP 91768	HIP 91772
WDS catalog	WDS 18428 + 5938
Further designations:	GJ 725, Struve 2398

Struve 2398 ( Σ 2398 , Gliese 725 ) is a binary star system in the constellation Draco . At a distance of around 11.5 light years, the components are among the closest known stars . Both stars are red dwarfs .

The components reached their maximum angular distance around 1904 at 17 ", since then their distance has been decreasing. An exact orbit has not yet been determined; estimates of the orbital period are between 300 and 400 years.

literature

WD Heintz: The Red-Dwarf Binary Σ2398. In: PASP . 99, 1987, pp. 1084-1088.
P. Baize: Orbital elements of eighteen visual double stars. In: Astronomy and Astrophysics . Volume 26, 1976, pp. 177-193, bibcode : 1976A & AS ... 26..177B

Web links

Individual evidence

↑ ^a ^b LDS 1466. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed November 8, 2018 .
↑ ^a ^b ^c ^d ^e ^f HD 173739. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed November 8, 2018 .
↑ ^a ^b ^c ^d ^e ^f HD 173740. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed November 8, 2018 .
↑ ^a ^b P. E. Kervella, F. Arenou, F. Mignard, F. Thévenin: Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly . In: Astronomy & Astrophysics . 623, p. A72. arxiv : 1811.08902 . bibcode : 2019A & A ... 623A..72K . doi : 10.1051 / 0004-6361 / 201834371 .

[Simbad-1] LDS 1466. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed November 8, 2018 .

[Simbad2-2] ↑ ^a ^b ^c ^d ^e ^f HD 173739. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed November 8, 2018 .

[Simbad3-3] ↑ ^a ^b ^c ^d ^e ^f HD 173740. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed November 8, 2018 .

[Kervella2019-4] P. E. Kervella, F. Arenou, F. Mignard, F. Thévenin: Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly . In: Astronomy & Astrophysics . 623, p. A72. arxiv : 1811.08902 . bibcode : 2019A & A ... 623A..72K . doi : 10.1051 / 0004-6361 / 201834371 .