BD -22°5866

Starbox begin
name=BD -22°5866Starbox image


caption = BD -22°5866Starbox observe
epoch=J2000
ra=22h 14m 38.364s
dec= -21° 41' 53.15"'
appmag_v=10.1
constell=Aquarius Starbox character
class=K5
b-v=
u-b=
r-i=
v-r=
variable=None Starbox astrometry
radial_v=
prop_mo_ra=161.7
prop_mo_dec= 193.0
parallax=
p_error=
absmag_v=12.3
-! style="background-color: #FFFFC0;" colspan="2" | Astrometry
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Distance
166 Ly
-! style="background-color: #FFFFC0;" colspan="2" | Binary orbit
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Orbit period of BD 22°5866 A and B: (P)
9 years
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Orbit period of BD 22°5866 A1 and A2: (P)
5 days
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Orbit period of BD 22°5866 B1 and B2: (P)
55 days
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Space between BD 22°5866 A and B:
5.8 AU
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Space between BD 22°5866 A1 and A2:
0.06 AU
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Space between 22°5866 B1 and B2:
0.26 AUStarbox detail
mass=0,8
radius=0,9
luminosity=0,4
temperature=3,500–5,000
metal=?
rotation=?
age=500 million Starbox catalog
names= NLTT 53279, LP 875-68, RBS 1834, 2MASS J22143835-2141535, CPD-22° 8173, PPM 273545, TYC 6384-505-1. Starbox reference
Simbad=BD+-22+5866
ARICNS =

BD -22°5866 is a quadruple-star system located 166 light years from Earth. The four stars are each about half the mass of the Sun and are approximately 500 million years old. The system is unusual in how closely the four stars are orbiting each other; one pair has an orbital separation of at most .06 AU and an orbital period of under five days, the other pair has a separation of at most .26 AU and a period of about 55 days, and the two pairs are separated by 5.8 AU and have an orbital period of less than nine years. [http://www.space.com/scienceastronomy/080110-aas-star-quartet.html SPACE.com - Four Stars Found in Amazingly Tight Bunch ] ]

Since current theories of star formation indicate that stars like these could not form in such close proximity to each other, a favored explanation is that there may have been a single gaseous disk that forced them into such small orbits within the first 100,000 years of their evolution. The two pairs are currently moving farther apart due to tidal interaction, indicating that they were once even more closely associated than today.

References

* [http://jumk.de/astronomie/special-stars/bd-22-5866.shtml jumk.de]
* [http://aladin.u-strasbg.fr/AladinPreview?-c=22+14+38.364-21+41+53.15&ident=NLTT+53279&submit=Aladin+previewer Image BD -22°5866]