All names: Gaia DR3 817739782926175488, GALEX J092121.2+431846, Gaia DR2 817739782926175488, Gaia EDR3 817739782926175488, WD 0918+435, SDSS J092121.20+431847.1, SDSS J092121.20+431847.0, SDSS J092121.19+431847.0
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | Gaia DR2 | Stilism | Tremblay et al. 2011 | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 09 21 21.20 (0.2) | 09 21 21.19 | 09 21 21.20 (0.3) | 09 21 21.19 (0.2) | 09 21 21.20 | 09 21 21.43 | 09 21 21.20 | ||||||
| Declination | 43 18 46.97 (0.2) | 43 18 47.01 | 43 18 46.97 (0.2) | 43 18 46.98 (0.2) | 43 18 47.01 | 43 18 43.20 | 43 18 47.03 | ||||||
| Spectral type | DA | DA | DA | DA_auto | DA | DA | DA | ||||||
| Effective temperature | [K] | 57970.0 (2940) | 69130.0 (7390) | 75789.0 (5926) | 74118.0 (5668) | ||||||||
| log(g) | [cgs] | 7.42 (0.2) | 7.98 (0.4) | 8.05 (0.3) | 7.91 (0.3) | ||||||||
| Mass | [M☉] | 0.48 (0.06) | 0.72 (0.2) | 0.683 (0.1) | |||||||||
| log(Luminosity) | [L☉] | 0.71 (0.1) | |||||||||||
| Cooling age | [Gyr] | 0.0001 (0.0001) | 0.0012 | ||||||||||
| log(H/He) | |||||||||||||
| log(C/He) | |||||||||||||
| log(Ca/He) | |||||||||||||
| log(Ca/H) | |||||||||||||
| log(C/H) | |||||||||||||
| log(N/H) | |||||||||||||
| log(O/H) | |||||||||||||
| log(Na/H) | |||||||||||||
| log(Mg/H) | |||||||||||||
| log(Al/H) | |||||||||||||
| log(Si/H) | |||||||||||||
| log(P/H) | |||||||||||||
| log(S/H) | |||||||||||||
| log(Sc/H) | |||||||||||||
| log(Ti/H) | |||||||||||||
| log(Cr/H) | |||||||||||||
| log(Mn/H) | |||||||||||||
| log(Fe/H) | |||||||||||||
| log(Ni/H) | |||||||||||||
| Parallax | [mas] | 0.82 (0.3) | 0.71 (0.4) | 0.82 (0.3) | |||||||||
| Distance | [pc] | 1220.70 (401) | 1416.00 (711) | 1220.70 (401) | |||||||||
| Composition | H | H | |||||||||||
| Proper motion (right ascension) | [mas/yr] | 6.215543853 (0.2) | 5.928026895 (0.5) | 6.216 (0.2) | 3.5 | ||||||||
| Proper motion (declination) | [mas/yr] | -0.305810608 (0.2) | -1.09231216 (0.5) | -0.306 (0.2) | 5.9 | ||||||||
| Variability | |||||||||||||
| Magnetic | |||||||||||||
| Bd | [MG] | ||||||||||||
| Infrared excess (disk) | |||||||||||||
| Binarity | |||||||||||||
| B magnitude | |||||||||||||
| V magnitude | |||||||||||||
| R magnitude | |||||||||||||
| I magnitude | |||||||||||||
| J magnitude | |||||||||||||
| H magnitude | |||||||||||||
| K magnitude | |||||||||||||
| u magnitude | 18.49 (0.02) | 18.49 (0.01) | 18.50 (0.02) | 18.49 | 18.48 (0.02) | ||||||||
| g magnitude | 18.95 (0.009) | 18.95 (0.009) | 18.95 (0.02) | 18.95 | 18.95 (0.02) | ||||||||
| r magnitude | 19.50 (0.01) | 19.50 (0.01) | 19.48 (0.02) | 19.48 | 19.47 (0.02) | ||||||||
| i magnitude | 19.88 (0.02) | 19.88 (0.02) | 19.87 (0.03) | 19.87 | 19.87 (0.03) | ||||||||
| z magnitude | 20.13 (0.1) | 20.13 (0.1) | 20.15 (0.1) | 20.15 | 20.14 (0.1) | ||||||||
| G magnitude | 19.21 (0.02) | 19.26 | 19.21 (0.004) | ||||||||||
| BP magnitude | 19.07 (0.02) | 19.02 | |||||||||||
| RP magnitude | 19.68 (0.06) | 19.60 | |||||||||||
| Pan g magnitude | 19.03 (0.008) | ||||||||||||
| Pan r magnitude | 19.49 (0.008) | ||||||||||||
| Pan i magnitude | 19.89 (0.02) | ||||||||||||
| Pan z magnitude | 20.19 (0.03) | ||||||||||||
| Pan y magnitude | |||||||||||||
| E(B-V) | 0.020 | ||||||||||||
* 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.