WISE 2220−3628
Brown dwarf in the constellation Grus
From Wikipedia, the free encyclopedia
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.[4]
WISE 2220-3628 Credit: NASA/ESA/CSA JWST MIRI | |
| 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: 288.92 ±0.15 mas/yr[3] Dec.: −97.10 ±0.16 mas/yr[3] |
| Parallax (π) | 93.50±1.02 mas[3] |
| Distance | 34.9 ± 0.4 ly (10.7 ± 0.1 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 | |
| WISE J222055.31−362817.4,[1] WISE 2220−3628[1] | |
| Database references | |
| SIMBAD | data |
Discovery
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]
Properties
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]
Distance
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).[5] Later the parallax measurement was improved revealing a larger distance of about 34 light years.[4]
See also
- List of star systems within 30–35 light-years
- List of Y-dwarfs
- WISE 0146+4234 (Y0)
- WISE 0350−5658 (Y1)
- WISE 0359−5401 (Y0)
- WISE 0535−7500 (≥Y1)
- WISE 0713−2917 (Y0)
- WISE 0734−7157 (Y0)