DX Cancri
LAVORI IN CORSO
Sommario del sistema
Questo sistema è localizzato a solo 11,82 AL dal nostro Sole, a nord del centro della costellazione del Cancro, a nord est della galassia M44 , conosciuta anche come gruppo dell'Alverare e Presepe, dal Latino "Mangiatoia"), e Delta Cancri (08:29:48+26:46.7, ICRS 2000.0). Tuttavia DX Cancri è troppo debole per poter essere osservata ad occhio nudo. La stella fu individuata da William Jacob Luyten ( 1899-1994), che fu in grado di individuare il moto proprio di più di 520.000 stella nonostante avesse perso la vista da un occhio fin dal 1925, costruendo un dispositivo di fotografico a scansione automatica della volta stellata.
La stella
Questa fredda e piccola, nana rossa, situata nella sequenza principale a M6.5Ve, possiede solo l'8,7% dell massa solare, l' 11% del suo diametro ( Claud H.Lacy, 1977) e circa 12/1.000.000 della sua luminosità. Tuttavia DX Cancri
This cool and dim, main sequence red dwarf (M6.5 Ve) has only 8.7 percent of Sol's mass (RECONS), 11 percent of its diameter (Claud H. Lacy, 1977, page 481), and about 12/1,000,000th of its brightness. However, DX Cancri may be a variable star. Some alternative names and useful star catalogue numbers are: GJ 1111, G 51-15, and LHS 248.
Hunt for Substellar Companions
The distance from DX Cancri where an Earth-type planet would be comfortable with liquid water is less than 0.04 AU result in a "day" that last less than 10 hours. At that distance, the rotation of the planet would probably be tidally locked with the star so that one side would have perpetual daylight while the other would be in eternal darkness. Moreover, DX Cancri's light is so red that Earth-type plants may not be able to photosynthesize very well.
Closest Neighbors
The following star systems are located within 10 ly of DX Cancri.
Star System Spectra & Luminosity Distance (light-years) Procyon 2 F5 V-IV DA-F/VII 5.0 LTT 12352 M3.5 V 5.1 Luyten's Star M3.5-5 V 5.5 GJ 1116 AB M5.5 V M5.5 V 5.7 Lalande 21185 M2.1 Ve 6.7 AD Leonis M3 Ve 7.3 Wolf 359 M5.8 Ve 7.7 Groombridge 1618 K5-7 Ve 8.2 Wolf 294 M3 V 8.2 Ross 614 AB M4.5 Ve ? 9.1 BD+44 2051 A WX Ursae Majoris (B) M1 Ve M5.5 Ve 9.2 Sirius 2 A0-1 Vm DA2-5/VII 6.5
Other Information
Up-to-date technical summaries on this star can be found at: the Astronomiches Rechen-Institut at Heidelberg's ARICNS, NASA's NStar Database, and the Research Consortium on Nearby Stars (RECONS) list of the 100 Nearest Star Systems. Additional information may be available at Roger Wilcox's Internet Stellar Database.
This constellation represents the Crab which is attacking Hercules during his fight with the water snake, Hydra. For more information on the stars and other objects in the constellation and an illustration, go to Christine Kronberg's Cancer. For another illustration, see David Haworth's Cancer.
For more information about stars including spectral and luminosity class codes, go to ChView's webpage on The Stars of the Milky Way.
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Traduzione effettuata per gentile concessione di Ben Lin responsabile del sito Solstation.com