Ross 128

Ross 128 is a dim, main-sequence red dwarf that is comparable to the brighter of the two stars, Gliese 623a, shown in the NASA HST image at left.

"This dim star lies about 10.9 light-years (ly) away in the northeastern corner (11:47:44.40+00:48:16.43, ICRS 2000.0) of Constellation Virgo, the Maiden -- south of Zavijava (Beta Virginis). It is too faint to be seen with the naked eye. The star was discovered in 1925 by Frank Elmore Ross (1874-1960), who also took the first good infrared and ultraviolet photographs of Venus in 1923. Ross first reported on this star in his "Second List of New Proper-Motion Stars," Astronomical Journal (36:856)."(Solstation)

"This cool and dim, main sequence red dwarf (M4.1 Vn) has almost a third of Sol's mass, a tenth of its diameter, but only 33/100,000th of its luminosity. (Another reference suggests a tenth of Sol's mass, a fifth of its diameter, and 23/100,000 of its luminosity). Ross 128 would be only one of many unremarkable stars except that it appears to be a flare star as well as one of Sol's closest neighbors. In contrast to Proxima Centauri which is a "magnetically younger" flare star that is "activity saturated", however, Ross 128 is considered to be a more "evolved" flare star where its flare rate may have decreased somewhat with increased magnetic evolution (Andrew Skumanich, 1986)."(Solstation)

Sources:

  • http://www.solstation.com/stars/ross128.htm
  • Skumanich http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?1986ApJ...309..858S

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Ross 154

Ross 154 is a dim, main-sequence red dwarf that is comparable to the two stars, Gliese 623a and the dimmer Gliese 623b, shown in the NASA HST image at left.

"This dim star is the seventh closest to our Sun, lying at about 9.7 light-years (ly) away. It is located in the eastern part (18:49:49.36-23:50:10.44, ICRS 2000.0) of Constellation Sagittarius, the Archer -- northeast of Kaus Borealis (Lambda Sagittarii). However, Ross 154 is too faint to be seen by the naked eye. The star was discovered in 1925 by Frank Elmore Ross (1874-1960), who also took the first good infrared and ultraviolet photographs of Venus in 1923. Ross first reported on this star in his "Second List of New Proper-Motion Stars," Astronomical Journal (36:856)."(Solstation)

"This cool and dim, main sequence red dwarf (M3.5 Ve) has around 17 percent of Sol's mass (RECONS estimate), 24 percent of its diameter (Johnson and Wright, 1983, page 693), and less than 5/10,000th of its luminosity. Ross 154 would be only one of many unremarkable stars except that it appears to be a flare star as well as one of Sol's closest neighbors. Its variable star designation is V1216 Sagittarii."(Solstation)

Sources:

  • http://www.solstation.com/stars/ross154.htm

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Ross 248

Ross 248 is a dim, main-sequence red dwarf that is comparable to the two stars, Gliese 623a and the dimmer Gliese 623b, shown in the NASA HST image at left.

"Ross 248 lies about 10.3 light-years (ly) away in the northwestern part (23:41:54.0+44:09:32:C~, ICRS 2000.0) of Constellation Andromeda, the Chained Maiden -- south of Lambda Andromedae and near Kappa and Iota Andromedae. It is too faint to be seen by the naked eye. The star was discovered in 1925 by Frank Elmore Ross (1874-1960), who also took the first good infrared and ultraviolet photographs of Venus in 1923. Ross first reported on this star in his "Second List of New Proper-Motion Stars," Astronomical Journal (36:856)."(Solstation)

"This cool and dim, main sequence red dwarf (M5.5 or 4.9 Ve) has almost a fourth of Sol's mass, seven percent of its diameter, but only 11/100,000th of its luminosity. (Another reference, however, suggests seven percent of Sol's mass, 17 percent of its diameter, but the same luminosity). Ross 248 would be only one of many unremarkable stars except that it is one of Sol's closest neighbors. Classified as a flare star, the star also has the variable designation HH Andromedae, and investigators have reported finding possible periods of variability at 4.2 years, 120 or 121 days, and five other periods between 60 and 291 days, which may be caused by an unresolved companion (Edward W. Weiss, 1993, page 1139)."(Solstation)

Sources:

  • http://www.solstation.com/stars/ross248.htm

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