Other names: WD 0017+136, Feige 4, SDSS J002001.81+135248.0
| Parameter | Unit | Limoges et al. 2015 | Bergeron et al. 2011 | SDSS DR12 | Simbad | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|
| Right ascension | 00 20 01.81 | 00 20 01.79 | 00 20 01.81 | |||
| Declination | 13 52 48.01 | 13 52 48.11 | 13 52 47.96 | |||
| Spectral type | DB | DBA | DB3 | DBA | ||
| Effective temperature | [K] | 18110 | 18130 | 18543 | ||
| log(g) | [cgs] | 8.09 | 8.09 | 8.12 | ||
| Mass | [M☉] | 0.65 | 0.65 | |||
| log(Luminosity) | [L☉] | -1.86 | -1.85 | |||
| Age | [Gyr] | 0.13 | ||||
| log(H/He) | -4.61 | |||||
| log(C/He) | ||||||
| log(Ca/He) | ||||||
| log(N/He) | ||||||
| log(O/He) | ||||||
| log(Na/He) | ||||||
| log(Mg/He) | ||||||
| log(Al/He) | ||||||
| log(Si/He) | ||||||
| log(P/He) | ||||||
| log(S/He) | ||||||
| log(Cl/He) | ||||||
| log(Sc/He) | ||||||
| log(Ti/He) | ||||||
| log(V/He) | ||||||
| log(Cr/He) | ||||||
| log(Mn/He) | ||||||
| log(Fe/He) | ||||||
| log(Co/He) | ||||||
| log(Ni/He) | ||||||
| log(Cu/He) | ||||||
| log(Zn/He) | ||||||
| log(Ga/He) | ||||||
| log(Ge/He) | ||||||
| log(Sr/He) | ||||||
| Parallax | [mas] | 30.00 | 30.00 | |||
| Distance | [pc] | 33.30 | 75.00 | |||
| Composition | He | He | ||||
| Proper motion (right ascension) | [mas/yr] | 57.0 | ||||
| Proper motion (declination) | [mas/yr] | -1.0 | ||||
| Variability | ||||||
| Magnetic | ||||||
| Has a disc | ||||||
| B magnitude | 15.10 | |||||
| V magnitude | 15.37 | 15.22 | ||||
| R magnitude | ||||||
| I magnitude | ||||||
| J magnitude | 15.82 | |||||
| H magnitude | 15.88 | |||||
| K magnitude | 15.92 | |||||
| u magnitude | 15.04 | 15.08 | 15.08 | |||
| g magnitude | 15.15 | 15.19 | 15.19 | |||
| r magnitude | 15.51 | 15.52 | 15.52 | |||
| i magnitude | 15.77 | 15.79 | 15.79 | |||
| z magnitude | 16.04 | 16.05 | 16.05 | |||