 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 41m 43.928s[1] |
| Declination | 42° 50′ 29.04″[1] |
| Apparent magnitude (V) | 3.0 - 15.6[2] |
| Characteristics | |
| Spectral type | K5[3] |
| Variable type | Nova[2] |
| Astrometry | |
| Parallax (π) | 0.729±0.024 mas[4] |
| Distance | 1372+51 −42[4](741[5] - 3,300[6]) pc |
| Absolute magnitude (MV) | −9.1 -+2.9[4] |
| Details | |
| White dwarf | |
| Mass | 0.8[5] M☉ |
| Surface gravity (log g) | 8.5[5] cgs |
| Temperature | 31,000[5] K |
| secondary | |
| Mass | 0.6[3] M☉ |
| Other designations | |
| Nova Cygni 1876,HR 8296,BD+42°4182a,AAVSO 2137+42,2MASS J21414393+4250290,Gaia DR2 1966874711229398656 | |
| Database references | |
| SIMBAD | data |
Q Cygni (Q Cyg), is astar located in theconstellation Cygnus. It is also known asNova Cygni 1876, and has the designationNGC 7114, andHR 8296. Nova Cygni is located in the northwestern portion of Cygnus along the border withLacerta.
One of the earliestnovae recorded,[6] Q Cygni was discovered by astronomerJohann Friedrich Julius Schmidt on November 24, 1876.[7] The star had undergone a nova, brightening to about 3rdmagnitude and remaining as bright for four days.[6]
The system is termed acataclysmic variable,[3] composed of awhite dwarf in closeorbit with another star that orbit each other every 10 hours. The white dwarf is surrounded by anaccretion disc, which blazes much brighter than the star it circles. The system has been estimated to be 740 ± 11 parsecs distant.[5] The secondary star has been estimated to be around 0.6 times as massive as the Sun, making it an orange dwarf of spectral type K5.[3] Also known as a donor star, the secondary supplies mass to the white dwarf via its accretion disc.[3]
A small nebulous disc was reported around the nova and this led to it being listed in theNew General Catalogue as a possibleplanetary nebula. Nonebulosity is visible in modern observations and theRevised New General Catalogue lists this as a"non-existent" object.[8]
Works related toQ Cygni at Wikisource