SDSS J143317.78+101123.3

SDSS J143317.78+101123.3 (shortened to SDSS J1433+1011, more simply J1433) is a binary system composed of a white dwarf and a brown dwarf. The brown dwarf is about 57 Jupiter masses and has transitioned from a stellar object to a brown dwarf due to losing mass to the white dwarf. As of 2016, this was the only known binary of this type.^[5]

SDSS J143317.78+101123.3.3

SDSS J143317.78+101123.3 Credit: legacy surveys
Observation data Epoch J2000      Equinox
Constellation	Boötes[1]
Right ascension	14h 33m 17.7877s[2]
Declination	+10° 11′ 23.485″[2]
Apparent magnitude (V)	18.86[3]
Characteristics
J1433
Evolutionary stage	White dwarf
Spectral type	WD[citation needed]
J1433b
Evolutionary stage	Brown dwarf
Spectral type	L1±1[citation needed]
Astrometry
Proper motion (μ)	RA: −12.782[2] mas/yr Dec.: −53.117[2] mas/yr
Parallax (π)	4.2866±0.1566 mas[2]
Distance	760 ± 30 ly (233 ± 9 pc)
Absolute bolometric magnitude (Mbol)	25[citation needed]
Orbit[4]
Period (P)	78.1 min
Semi-major axis (a)	0.5869 R☉
Inclination (i)	84.36°
Semi-amplitude (K1) (primary)	33.8 km/s
Semi-amplitude (K2) (secondary)	511.1 km/s
Details
J1433
Surface gravity (log g)	8.41[4] cgs
Temperature	13,200±200[5] K
J1433b
Mass	0.055±0.008[5] M☉
Mass	58±8[5] MJup
Temperature	2,401±10 K (day) 2,344±7 (night)[5] K
Other designations
J1433, PM J14332+1011, SDSS J143317.78+101122.8, Gaia EDR3 1176468611268115200, Gaia DR2 1176468611268115200
J1433b: SDSS J143317.78+101122.8b
Database references
SIMBAD	data