WISEPA J031325.96+780744.2

WISE 0313+7807 Credit: unWISE
Observation data Epoch MJD 55448.07[1]      Equinox J2000[1]
Constellation	Cepheus
Right ascension	03h 13m 26.02s[1]
Declination	78° 07′ 44.4″[1]
Characteristics
Spectral type	T8.5[1][2]
Apparent magnitude (J (2MASS filter system))	17.65 ± 0.07[1]
Apparent magnitude (H (2MASS filter system))	17.63 ± 0.06[1]
Astrometry
Proper motion (μ)	RA: 71.1 ± 1.2[3] mas/yr Dec.: 54.8 ± 1.2[3] mas/yr
Parallax (π)	134.3 ± 3.6 mas[3]
Distance	24.3 ± 0.7 ly (7.4 ± 0.2 pc)
Details[4]
Mass	11.4 MJup
Radius	1.03±0.02 (0.91–1.20) RJup
Luminosity	1.00+0.047 −0.045×10−6 L☉
Surface gravity (log g)	3.25±0.01 cgs
Temperature	564.47+0.36 −0.35 K
Metallicity	${\displaystyle {\begin{smallmatrix}\left[{\ce {M}}/{\ce {H}}\right]\end{smallmatrix}}}$ = −0.08±0.01
Age	3.03 Gyr
Other designations
WISEPA J031325.96+780744.2[1] WISE J0313+7807[1] WISE 0313+7807[1]
Database references
SIMBAD	data

WISEPA J031325.96+780744.2 (designation abbreviated to WISE 0313+7807, or WISE J0313+7807) is a planetary-mass object^[4] of spectral class T8.5,^[1][2] located in constellation Cepheus at approximately 21 light-years from Earth.^[5]

WISE 0313+7807 was discovered in 2011 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 2011 Kirkpatrick et al. published a paper in The Astrophysical Journal Supplement, where they presented discovery of 98 new found by WISE brown dwarf systems with components of spectral types M, L, T and Y, among which also was WISE 0313+7807.^{[1][note 1]}

Currently the most accurate distance estimate of WISEPA J031325.96+780744.2 is a trigonometric parallax, published in 2019 by Kirkpatrick et al.: 134.3 ± 3.6 mas, corresponding to 7.4+0.2
−0.2 pc, or 24.3+0.7
−0.6 ly.^[3]

The best estimate is marked in bold.