QZ Serpentis
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 Artistic Representation of QZ Serpentis system | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 56m 54.4738s[1] |
| Declination | +21° 07′ 19.083″[1] |
| Apparent magnitude (V) | 11.8 - 17.7[2] |
| Characteristics | |
| Spectral type | DA + K4Ve[3][1] |
| U−B color index | −0.32[4] |
| B−V color index | +0.72[4] |
| Variable type | U Gem[5] |
| Astrometry | |
| Radial velocity (Rv) | −48.0±6.0 km/s |
| Proper motion (μ) | RA: +5.215[1] mas/yr Dec.: −9.865[1] mas/yr |
| Parallax (π) | 3.1106±0.0742 mas |
| Distance | 1,050 ± 30 ly (321 ± 8 pc) |
| Orbit | |
| Primary | QZ Ser A |
| Companion | QZ Ser B |
| Period (P) | 119.752 min[4] |
| Semi-major axis (a) | 0.974 R☉ |
| Eccentricity (e) | 0 (fixed) |
| Inclination (i) | 32[4][5]° |
| Semi-amplitude (K2) (secondary) | 207.5[4] km/s |
| Details | |
| A | |
| Mass | 0.75[4][5] M☉ |
| Radius | 0.0107[4][5] R☉ |
| B | |
| Mass | 0.15[4][5] M☉ |
| Radius | 0.1923[4][5] R☉ |
| Other designations | |
| QZ Ser, Gaia DR3 1204588041329337600, TIC 229556065, 2MASS J15565447+2107190[1] | |
| Database references | |
| SIMBAD | data |
QZ Serpentis (abbreviated QZ Ser) is a binary star system consisting of a orange dwarf and a white dwarf, located approximately 1050 light-years away from us in the constellation Serpens. It is considered a dwarf nova because the white dwarf draws the outer layers of hydrogen from the star.[4] The two stars orbit each other once every 119.752 minutes or 2 hours, and they may also be accompanied by a third substellar companion, whose mass is only about half that of Jupiter.[3][4] QZ Ser was discovered by Katsumi Haseda in 1998.[4]
