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- Ross_248 abstract "Ross 248 (HH Andromedae) is a small star located approximately 10.30 light-years (3.16 parsecs) from Earth in the northern constellation of Andromeda. Despite its proximity to the Earth, this star is too dim to be seen with the naked eye. Ross 248 was first catalogued by Frank Elmore Ross in 1926 with his second list of proper motion stars.This star has about 12% of the Sun's mass and 16% of the Sun's radius, but only 0.2% of the Sun's luminosity. It has a stellar classification of M6 V, which indicates it is a type of main sequence star known as a red dwarf. This is a flare star that occasionally increases in luminosity. With high probability there appears to be a long-term cycle of variability with a period of 4.20 years. This variability causes the star to range in visual magnitude from 12.23 to 12.34. In 1950, this became the first star to have a small variation in magnitude attributed to spots on its photosphere.Long term observations of this star by the Sproul Observatory show no astrometric perturbations by an unseen companion. The proper motion of this star was examined for a brown dwarf or stellar companion orbiting at a wide separation (between 100–1400 AU) but none was found. A search for a faint companion using the Hubble Space Telescope Wide Field Planetary Camera revealed nothing, nor did a search with near-infrared speckle interferometry. However, none of these searches rule out a companion that is smaller than the detection minima.The space velocity components of this star in the galactic coordinate system are [U, V, W] = [–32.9 ± 0.7, –74.3 ± 1.3, 0.0 ± 1.4] km/s. The trajectory of Ross 248 will bring it closer to the Solar System in the future. In 1993 Matthews suggested that in about 33,000 years Ross 248 would be the closest star to the Sun, approaching within a minimum distance of 3.024 light-years (0.927 parsecs) in 36,000 years. However, it will recede thereafter and will again be further from the Sun than Proxima Centauri 42,000 years from now.The spacecraft Voyager 2 is traveling on a path headed roughly in the direction of Ross 248, and is expected to come within 1.76 light-years (0.54 parsecs) of the star in 40,176 years. A spacecraft that escaped the Solar System with a velocity of 25.4 km/s would reach this star 37,000 years from now when the star is just past its nearest approach. By comparison, the Voyager 1 has an escape velocity of 16.6 km/s.".
- Ross_248 thumbnail Near-stars-past-future-en.svg?width=300.
- Ross_248 wikiPageExternalLink AladinPreview?-c=23+41+55.01%2B44+10+38.9&ident=V*+HH+And&submit=Aladin+previewer.
- Ross_248 wikiPageExternalLink sim-id?protocol=html&Ident=CSI%2B43-23394+2&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id.
- Ross_248 wikiPageExternalLink ross248.htm.
- Ross_248 wikiPageID "205671".
- Ross_248 wikiPageRevisionID "645310547".
- Ross_248 absmagV "14.79".
- Ross_248 appmag "6.9".
- Ross_248 appmag1Passband "J".
- Ross_248 appmagV "12.29".
- Ross_248 bV "+1.92".
- Ross_248 class "M6 V".
- Ross_248 colwidth "30".
- Ross_248 constell Andromeda_(constellation).
- Ross_248 epoch "J2000".
- Ross_248 gravity "5.12".
- Ross_248 hasPhotoCollection Ross_248.
- Ross_248 luminosity "0.0018".
- Ross_248 mass "0.136".
- Ross_248 pError "0.72".
- Ross_248 parallax "316.72".
- Ross_248 propMoDec "–1,584".
- Ross_248 propMoRa "+111".
- Ross_248 radialV "–81".
- Ross_248 radius "0.16".
- Ross_248 rotationalVelocity "1.2".
- Ross_248 temperature "2799".
- Ross_248 uB "+1.48".
- Ross_248 variable Flare_star.
- Ross_248 subject Category:Andromeda_(constellation).
- Ross_248 subject Category:BY_Draconis_variables.
- Ross_248 subject Category:Flare_stars.
- Ross_248 subject Category:Gliese_and_GJ_objects.
- Ross_248 subject Category:M-type_main-sequence_stars.
- Ross_248 subject Category:Objects_named_with_variable_star_designations.
- Ross_248 subject Category:Objects_within_100_ly_of_Earth.
- Ross_248 subject Category:Ross_objects.
- Ross_248 type CelestialBody.
- Ross_248 type Star.
- Ross_248 type Thing.
- Ross_248 comment "Ross 248 (HH Andromedae) is a small star located approximately 10.30 light-years (3.16 parsecs) from Earth in the northern constellation of Andromeda. Despite its proximity to the Earth, this star is too dim to be seen with the naked eye. Ross 248 was first catalogued by Frank Elmore Ross in 1926 with his second list of proper motion stars.This star has about 12% of the Sun's mass and 16% of the Sun's radius, but only 0.2% of the Sun's luminosity.".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Ross 248".
- Ross_248 label "Росс 248".
- Ross_248 label "ロス248".
- Ross_248 label "로스 248".
- Ross_248 sameAs Ross_248.
- Ross_248 sameAs Ross_248.
- Ross_248 sameAs Ross_248.
- Ross_248 sameAs Ross_248.
- Ross_248 sameAs Ross_248.
- Ross_248 sameAs Ross_248.
- Ross_248 sameAs ロス248.
- Ross_248 sameAs 로스_248.
- Ross_248 sameAs Ross_248.
- Ross_248 sameAs Ross_248.
- Ross_248 sameAs m.01d536.
- Ross_248 sameAs Q749072.
- Ross_248 sameAs Q749072.
- Ross_248 wasDerivedFrom Ross_248?oldid=645310547.
- Ross_248 depiction Near-stars-past-future-en.svg.
- Ross_248 isPrimaryTopicOf Ross_248.
- Ross_248 name "Ross 248".