Observation data Epoch J2000 [1] Equinox J2000 [1] | |
---|---|
Constellation | Grus |
Right ascension | 22h 20m 55.31s [1] |
Declination | −36° 28′ 17.4″ [1] |
Characteristics | |
Spectral type | Y0 [1] |
Apparent magnitude (J ( MKO-NIR filter system)) | 20.38 ± 0.17 [1] |
Apparent magnitude (H ( MKO-NIR filter system)) | 20.81 ± 0.30 [1] |
Astrometry | |
Radial velocity (Rv) | −53.2±2.8 [2] km/s |
Total velocity | 55.33±2.82 [2] km/s |
Proper motion (μ) |
RA: 290.1 ± 0.9
mas/
yr
[3] Dec.: −97.1 ± 0.9 mas/ yr [3] |
Parallax (π) | 95.5 ± 2.1 mas [3] |
Distance | 34.2 ± 0.8
ly (10.5 ± 0.2 pc) |
Details | |
Mass | 6-35 [2] MJup |
Radius | 0.94±0.14 [2] RJup |
Surface gravity (log g) | 4.7±0.5 [2] cgs |
Temperature | 480±41 [2] K |
Age | 4.5±4.0 [2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
WISE J222055.31−362817.4 (designation abbreviated to WISE 2220−3628) is a brown dwarf of spectral class Y0, [1] located in constellation Grus at approximately 34.2 light-years from Earth. [3]
WISE 2220−3628 was discovered in 2012 by J. Davy Kirkpatrick et al. from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite — NASA infrared-wavelength 40 cm (16 in) space telescope, which mission lasted from December 2009 to February 2011. In 2012 Kirkpatrick et al. published a paper in The Astrophysical Journal, where they presented discovery of seven new found by WISE brown dwarfs of spectral type Y, among which also was WISE 2220−3628. [1]
Y-class dwarfs are among the coldest of all brown dwarfs. [1] WISE 2220-3628 was observed with JWST and found to be very similar to CWISEP J1935-1546, with the difference of having no signature of an aurora and no temperature inversion in its atmosphere. [2]
The most accurate distance estimate of WISE 2220−3628 was a trigonometric parallax, published in 2014 by Beichman et al.: 0.136 ± 0.017 arcsec, corresponding to a distance of 7.4 ± 0.9 pc (24.1 ± 2.9 ly). [4] Later the parallax measurement was improved revealing a larger distance of about 34 light years. [3]
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cite journal}}
: CS1 maint: numeric names: authors list (
link)
Observation data Epoch J2000 [1] Equinox J2000 [1] | |
---|---|
Constellation | Grus |
Right ascension | 22h 20m 55.31s [1] |
Declination | −36° 28′ 17.4″ [1] |
Characteristics | |
Spectral type | Y0 [1] |
Apparent magnitude (J ( MKO-NIR filter system)) | 20.38 ± 0.17 [1] |
Apparent magnitude (H ( MKO-NIR filter system)) | 20.81 ± 0.30 [1] |
Astrometry | |
Radial velocity (Rv) | −53.2±2.8 [2] km/s |
Total velocity | 55.33±2.82 [2] km/s |
Proper motion (μ) |
RA: 290.1 ± 0.9
mas/
yr
[3] Dec.: −97.1 ± 0.9 mas/ yr [3] |
Parallax (π) | 95.5 ± 2.1 mas [3] |
Distance | 34.2 ± 0.8
ly (10.5 ± 0.2 pc) |
Details | |
Mass | 6-35 [2] MJup |
Radius | 0.94±0.14 [2] RJup |
Surface gravity (log g) | 4.7±0.5 [2] cgs |
Temperature | 480±41 [2] K |
Age | 4.5±4.0 [2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
WISE J222055.31−362817.4 (designation abbreviated to WISE 2220−3628) is a brown dwarf of spectral class Y0, [1] located in constellation Grus at approximately 34.2 light-years from Earth. [3]
WISE 2220−3628 was discovered in 2012 by J. Davy Kirkpatrick et al. from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite — NASA infrared-wavelength 40 cm (16 in) space telescope, which mission lasted from December 2009 to February 2011. In 2012 Kirkpatrick et al. published a paper in The Astrophysical Journal, where they presented discovery of seven new found by WISE brown dwarfs of spectral type Y, among which also was WISE 2220−3628. [1]
Y-class dwarfs are among the coldest of all brown dwarfs. [1] WISE 2220-3628 was observed with JWST and found to be very similar to CWISEP J1935-1546, with the difference of having no signature of an aurora and no temperature inversion in its atmosphere. [2]
The most accurate distance estimate of WISE 2220−3628 was a trigonometric parallax, published in 2014 by Beichman et al.: 0.136 ± 0.017 arcsec, corresponding to a distance of 7.4 ± 0.9 pc (24.1 ± 2.9 ly). [4] Later the parallax measurement was improved revealing a larger distance of about 34 light years. [3]
{{
cite journal}}
: CS1 maint: numeric names: authors list (
link)