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• Struve_2398 abstract "Struve 2398 (Gliese 725) is a binary star system in the northern constellation of Draco. Struve 2398 is star number 2398 in the Struve Double Star Catalog of Baltic-German astronomer Friedrich Georg Wilhelm von Struve. The astronomer's surname, and hence the star identifier, is sometimes indicated by a Greek sigma, Σ. Although the components are too faint to be viewed with the naked eye, this star system is among the closest to the Sun. Parallax measurements by the Hipparcos spacecraft give them an estimated distance of about 11.6 light years away.Both stars are small red dwarfs, with each having around a third the Sun's mass and radius. They each display the type of variability common to flare stars, and their active surfaces are sources of X-ray emission. The orbital period for the pair is about 295 years, with an average distance of about 56 astronomical units, and the eccentricity of their orbit is 0.70.The pair has a relatively high proper motion of 2.2 arc seconds per year. The system is on an orbit through the Milky Way that has an eccentricity of 0.05, carrying them as close as 8 kpc and as far as 9 kpc from the Galactic Center. The plane of their galactic orbit carries them as far as 463−489 away from the galactic plane.".
• Struve_2398 wikiPageExternalLink st2398ab.htm.
• Struve_2398 wikiPageExternalLink struve-2398.shtml.
• Struve_2398 wikiPageExternalLink Struve2398.html.
• Struve_2398 wikiPageExternalLink Astro-Star-Dwarf-LFT-1431-2.htm.
• Struve_2398 wikiPageExternalLink nearby_stars.htm.
• Struve_2398 wikiPageID "2365189".
• Struve_2398 wikiPageLength "8857".
• Struve_2398 wikiPageOutDegree "37".
• Struve_2398 wikiPageRevisionID "707982094".
• Struve_2398 wikiPageWikiLink Astronomical_unit.
• Struve_2398 wikiPageWikiLink Binary_star.
• Struve_2398 wikiPageWikiLink Category:Binary_stars.
• Struve_2398 wikiPageWikiLink Category:Draco_(constellation).
• Struve_2398 wikiPageWikiLink Category:Durchmusterung_objects.
• Struve_2398 wikiPageWikiLink Category:Flare_stars.
• Struve_2398 wikiPageWikiLink Category:Gliese_and_GJ_objects.
• Struve_2398 wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
• Struve_2398 wikiPageWikiLink Category:Hipparcos_objects.
• Struve_2398 wikiPageWikiLink Category:Local_Bubble.
• Struve_2398 wikiPageWikiLink Category:M-type_main-sequence_stars.
• Struve_2398 wikiPageWikiLink Draco_(constellation).
• Struve_2398 wikiPageWikiLink Durchmusterung.
• Struve_2398 wikiPageWikiLink Flare_star.
• Struve_2398 wikiPageWikiLink Friedrich_Georg_Wilhelm_von_Struve.
• Struve_2398 wikiPageWikiLink Galactic_Center.
• Struve_2398 wikiPageWikiLink Galactic_plane.
• Struve_2398 wikiPageWikiLink Gliese_Catalogue_of_Nearby_Stars.
• Struve_2398 wikiPageWikiLink Henry_Draper_Catalogue.
• Struve_2398 wikiPageWikiLink Hipparcos.
• Struve_2398 wikiPageWikiLink Light-year.
• Struve_2398 wikiPageWikiLink List_of_nearest_stars_and_brown_dwarfs.
• Struve_2398 wikiPageWikiLink Milky_Way.
• Struve_2398 wikiPageWikiLink Orbital_eccentricity.
• Struve_2398 wikiPageWikiLink Proper_motion.
• Struve_2398 wikiPageWikiLink Red_dwarf.
• Struve_2398 wikiPageWikiLink Star_catalogue.
• Struve_2398 wikiPageWikiLink Stellar_parallax.
• Struve_2398 wikiPageWikiLink Struve_Double_Star_Catalog.
• Struve_2398 wikiPageWikiLink Variable_star.
• Struve_2398 wikiPageWikiLink X-ray_astronomy.
• Struve_2398 wikiPageWikiLinkText "HD 173739".
• Struve_2398 wikiPageWikiLinkText "HD 173740".
• Struve_2398 wikiPageWikiLinkText "Struve 2398".
• Struve_2398 wikiPageWikiLinkText "Struve 2398".
• Struve_2398 ageGyr "2.4".
• Struve_2398 ageGyr "3".
• Struve_2398 appmagV "8.94".
• Struve_2398 appmagV "9.7".
• Struve_2398 axis "10.5".
• Struve_2398 bV "1.53".
• Struve_2398 class "M3 V + M3.5 V".
• Struve_2398 component "Struve 2398 A".
• Struve_2398 component "Struve 2398 B".
• Struve_2398 constell Draco_(constellation).
• Struve_2398 eccentricity "0.7".
• Struve_2398 epoch "J2000".
• Struve_2398 inclination "52.5".
• Struve_2398 luminosity "0.021".
• Struve_2398 luminosity "0.039".
• Struve_2398 name "Struve 2398 B".
• Struve_2398 names "ADS 11632, BD +59°1915, GCTP 4330.00 A/B, Gl 725 A/B.".
• Struve_2398 names "G 227-046, HD 173739, HIP 91768, LHS 58, Vyssotsky 184.".
• Struve_2398 names "G 227-047, HD 173740, HIP 91772, LHS 91772.".
• Struve_2398 node "139.9".
• Struve_2398 pError "2.18".
• Struve_2398 pError "3.21".
• Struve_2398 parallax "280.18".
• Struve_2398 parallax "289.48".
• Struve_2398 periarg "203.8".
• Struve_2398 periastron "1778".
• Struve_2398 period "294.7".
• Struve_2398 propMoDec "+1807.48".
• Struve_2398 propMoDec "+1809.15".
• Struve_2398 propMoRa "–1332.03".
• Struve_2398 propMoRa "–1338.68".
• Struve_2398 radialV "1.09".
• Struve_2398 radialV "–1.07".
• Struve_2398 simbad "**+STF+2398AB".
• Struve_2398 simbad "HD+173739".
• Struve_2398 simbad "HD+173740".
• Struve_2398 sn "A".
• Struve_2398 sn "B".
• Struve_2398 sn "The system".
• Struve_2398 uB "1.11".
• Struve_2398 variable Flare_star.
• Struve_2398 wikiPageUsesTemplate Template:DEC.
• Struve_2398 wikiPageUsesTemplate Template:Nearest_systems.
• Struve_2398 wikiPageUsesTemplate Template:RA.
• Struve_2398 wikiPageUsesTemplate Template:Reflist.
• Struve_2398 wikiPageUsesTemplate Template:Starbox_astrometry.
• Struve_2398 wikiPageUsesTemplate Template:Starbox_begin.
• Struve_2398 wikiPageUsesTemplate Template:Starbox_catalog.
• Struve_2398 wikiPageUsesTemplate Template:Starbox_character.
• Struve_2398 wikiPageUsesTemplate Template:Starbox_detail.
• Struve_2398 wikiPageUsesTemplate Template:Starbox_end.
• Struve_2398 wikiPageUsesTemplate Template:Starbox_observe_2s.
• Struve_2398 wikiPageUsesTemplate Template:Starbox_reference.
• Struve_2398 wikiPageUsesTemplate Template:Starbox_visbin.
• Struve_2398 wikiPageUsesTemplate Template:Stars_of_Draco.

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