YZ Leonis Minoris information

YZ Leonis Minoris
	; Illustration of a system with a accreting red dwarf and a low-mass donor companion, similar to YZ Leonis Minoris.
Observation data; Epoch J2000 Equinox J2000
Constellation	Leo Minor
Right ascension	09h 26m 38.725s
Declination	36° 24′ 02.456″
Apparent magnitude (V)	19.33±0.31 (mean)
Characteristics
Evolutionary stage	White dwarf
Spectral type	DB
Apparent magnitude (G)	19.27
Variable type	AM Canum Venaticorum; Eclipsing binary; SU Ursae Majoris
Donor companion
Evolutionary stage	Helium-rich star
Astrometry
Proper motion (μ)	RA: −31.6±0.203 mas/yr ; Dec.: −3.672±0.112 mas/yr
Parallax (π)	1.227 ± 0.208 mas
Distance	2657±450 ly ; (815±138 pc)
Orbit
Primary	A
Period (P)	28.3 minutes
Semi-major axis (a)	0.29 R☉
Inclination (i)	83.1±0.1°
Details
White dwarf
Mass	0.79–0.89 M☉
Radius	0.01 R☉
Radius	6,957 km
Luminosity	0.00946–0.0352 L☉
Surface gravity (log g)	8.3 cgs
Temperature	18,000–25,000 K
Donor companion
Mass	0.027–0.038 M☉
Radius	0.043 R☉
Luminosity	0.00035 L☉
Surface gravity (log g)	5.6 cgs
Temperature	3,570±130 K
Other designations
	SDSS J0926+3624, YZ LMi, Gaia DR2 798764346831516032, WD J092638.72+362402.46, SDSS J092638.71+362402.4
Database references
SIMBAD	data

YZ Leonis Minoris, also known as SDSS J0926+3624, is a star system in the constellation Leo Minor. It is an AM Canum Venaticorum-type variable star, a type of binary systems with ultra-short periods (between 5 and 70 minutes). It is also an eclipsing binary. The apparent magnitude of the system is generally 19.3^m, varying by about two magnitudes due to periodic eclipses and outbursts. The distance to YZ LMi is of 815 pc (2,660 ly).

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Observation data Epoch J2000 Equinox J2000
Illustration of a system with a accreting red dwarf and a low-mass donor companion, similar to YZ Leonis Minoris.
Constellation	Leo Minor^[1]
Right ascension	09^h 26^m 38.725^s^[2]
Declination	36° 24′ 02.456″^[2]
Apparent magnitude (V)	19.33±0.31^[3] (mean)^[a]^[b]
Characteristics
Evolutionary stage	White dwarf
Spectral type	DB^[2]
Apparent magnitude (G)	19.27^[2]
Variable type	AM Canum Venaticorum Eclipsing binary SU Ursae Majoris^[1]
Donor companion
Evolutionary stage	Helium-rich star^[4]
Astrometry

Proper motion (μ)	RA: −31.6±0.203 mas/yr^[2] Dec.: −3.672±0.112 mas/yr^[2]
Parallax (π)	1.227 ± 0.208 mas^[5]
Distance	2657±450 ly (815±138 pc)^[5]

Orbit
Primary	A
Period (P)	28.3 minutes^[4]
Semi-major axis (a)	0.29 `R`_☉^[5]
Inclination (i)	83.1±0.1^[6]°
Details^[7]
White dwarf
Mass	0.79–0.89 `M`_☉
Radius	0.01 `R`_☉
Radius	6,957 km
Luminosity	0.00946–0.0352^[c] `L`_☉
Surface gravity (log g)	8.3 cgs
Temperature	18,000–25,000 K
Donor companion
Mass	0.027–0.038 `M`_☉
Radius	0.043 `R`_☉
Luminosity	0.00035^[d] `L`_☉
Surface gravity (log g)	5.6 cgs
Temperature	3,570±130^[5] K
Other designations
SDSS J0926+3624, YZ LMi, Gaia DR2 798764346831516032, WD J092638.72+362402.46, SDSS J092638.71+362402.4^[2]^[1]
Database references
SIMBAD	data

YZ Leonis Minoris information

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