All names: LSPM J2157+0816, WDJ215740.52+081559.91, SDSS J215740.48+081558.0, Gaia DR3 2724895585236306560, Gaia EDR3 2724895585236306560, SDSS J215740.49+081558.0, USNO-B1.0 0982-00694286, WDJ215740.52+081559.92, Gaia DR2 2724895585236306560
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Kilic et al. 2025 | Gaia DR2 | Stilism | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 21 57 40.47 (0.2) | 21 57 40.47 | 21 57 40.47 | 21 57 40.52 (0.2) | 21 57 40.47 | ||||
| Declination | 08 15 56.66 (0.3) | 08 15 56.77 | 08 15 56.66 | 08 15 59.90 (0.3) | 08 15 56.77 | ||||
| Spectral type | DC | DA | DA | ||||||
| Effective temperature | [K] | 5603.0 (52) | 5810.0 (199) | ||||||
| log(g) | [cgs] | 7.95 (0.03) | 8.05 (0.08) | ||||||
| Mass | [M☉] | 0.54 (0.03) | 0.616 (0.07) | ||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| 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] | 11.48 (0.3) | 11.40 (0.3) | 11.48 | 11.48 (0.3) | 11.40 (0.3) | |||
| Distance | [pc] | 87.09 (2) | 87.72 (3) | 87.09 | 87.09 (2) | 87.72 (3) | |||
| Composition | He | ||||||||
| Proper motion (right ascension) | [mas/yr] | -50.09670317 (0.3) | -50.72365847 (0.8) | -50.097 (0.3) | -50.72365847 | ||||
| Proper motion (declination) | [mas/yr] | -202.4024962 (0.3) | -203.2025385 (1) | -202.402 (0.3) | -203.2025385 | ||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | 19.50 | ||||||||
| V magnitude | |||||||||
| R magnitude | 17.00 | ||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 20.31 (0.05) | 20.31 (0.05) | |||||||
| g magnitude | 19.38 (0.01) | 19.38 (0.01) | |||||||
| r magnitude | 18.83 (0.01) | 18.83 (0.01) | |||||||
| i magnitude | 18.82 (0.01) | 18.82 (0.01) | |||||||
| z magnitude | 18.74 (0.03) | 18.74 (0.03) | |||||||
| G magnitude | 18.97 (0.05) | 18.99 | 18.97 | 18.97 (0.004) | 18.99 | ||||
| BP magnitude | 19.34 (0.05) | 19.32 | 19.32 | ||||||
| RP magnitude | 18.38 (0.04) | 18.44 | 18.44 | ||||||
| Pan g magnitude | 19.32 (0.01) | ||||||||
| Pan r magnitude | 18.95 (0.004) | ||||||||
| Pan i magnitude | 18.81 (0.007) | ||||||||
| Pan z magnitude | 18.81 (0.02) | ||||||||
| Pan y magnitude | 18.83 (0.04) | ||||||||
| E(B-V) | 0.005 | ||||||||
* Constant surface field
Spectra without link are available upon request
The Montreal White Dwarf Database is produced and maintained by Prof. Patrick Dufour (Université de Montréal) and Dr. Simon Blouin (University of Victoria). Please send database updates, corrections, suggestions or bug reports to patrick.dufour@umontreal.ca.