WD 0806-661

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Coordinates: Sky map 08h 06m 53.736s, −66° 18′ 16.74″

WD 0806-661
Observation data
Epoch J2000[1]:{{{3}}}      Equinox J2000[1]:{{{3}}}
Constellation Volans
Right ascension 08h 06m 53.736s[1]:{{{3}}}
Declination −66° 18′ 16.74″[1]:{{{3}}}
Characteristics
Spectral type DQ4.2[2]:{{{3}}}

[3]:{{{3}}} / Y?[4]:{{{3}}}[5]:{{{3}}}
Apparent magnitude (B) 13.74[6]:{{{3}}} / -
Apparent magnitude (V) 13.71[6]:{{{3}}} / -
Apparent magnitude (R) 13.64[6]:{{{3}}} / -
Apparent magnitude (I) 13.60[6]:{{{3}}} / -
Apparent magnitude (J) 13.704 ± 0.023[1]:{{{3}}} / >23.9[7]:{{{3}}}
Apparent magnitude (H) 13.739 ± 0.025[1]:{{{3}}} / -
Apparent magnitude (K) 13.781 ± 0.043[1]:{{{3}}} / -
Astrometry
Proper motion (μ) RA: 88.0 ± 2.8[1]:{{{3}}} mas/yr
Dec.: 139.9 ± 1.3[1]:{{{3}}} mas/yr
Parallax (π) 52.17 ± 1.67[8]:{{{3}}} mas
Distance 63 ± 2 ly
(19.2 ± 0.6 pc)
Absolute magnitude (MV) 12.30[6]:{{{3}}} / -
Details
Component A
Mass 0.58 ± 0.03[6]:{{{3}}} M☉
Surface gravity (log g) 8.00 ± 0.05[6]:{{{3}}} cgs
Temperature 10205 ± 390[6]:{{{3}}} K
Age 0.62[6]:{{{3}}}[note 1] Gyr
Component B
Mass 6–9[7]:{{{3}}} MJup
Temperature 300–345[7]:{{{3}}} K
Position (relative to A)
Component B
Angular distance 130.2 ± 0.2″ [9]:{{{3}}}
Position angle 104.2 ± 0.2° [9]:{{{3}}}
Observed separation
(projected)		 2500 AU [9]:{{{3}}}
Other designations
Component A:
BPM 4834, LAWD 27, L 97-3, LTT 3059, NLTT 19008, WD 0806-661, WD 0806-66, GJ 3483, 2MASS J08065373-6618167, GSC 08936-01284, GEN# +6.00204834, uvby98 986097003, WG 12

Component B:
WD 0806-661 B,[9]:{{{3}}}[7]:{{{3}}} WD 0806-661B,[10]:{{{3}}} GJ 3483B[4]:{{{3}}}
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia		 data

WD 0806-661 (L 97-3, GJ 3483) is a wide binary system of a white dwarf and a Y-type sub-brown dwarf (designated "B"), located in constellation Volans at 63 light-years from Earth. The companion was discovered in 2011. It has the largest actual (2500 AU) and apparent separation (more than 2 arcminutes) of any known planetary-mass object.

Discovery

Component B was discovered in 2011 with Spitzer Space Telescope. Its discovery paper is Luhman et al., 2011. At the time of its discovery, WD 0806-661 B was the coldest "star" that has ever been found, with a temperature of only 27–80 °C, which is similar to some hot areas of Earth.[9]:{{{3}}}

See also

Notes

  1. ↑ White-dwarf cooling age, i.e. age as degenerate star (not including main-sequence lifetime).

References

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External links

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