All names: WD 0812+478, SDSS J081548.92+474038.9, Gaia EDR3 931238043230275968, TIC 22635383, GALEX J081548.9+474040, Gaia DR3 931238043230275968, 2MASS J08154894+4740391, PG 0812+478, Gaia DR2 931238043230275968
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Gaia DR2 | Stilism | Gianninas et al. 2011 | Liebert et al. 2005 | Vincent et al. 2024 | Simbad | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 15 48.88 (0.03) | 08 15 48.88 (0.05) | 08 15 48.88 | 08 15 48.93 (0.03) | 08 15 48.10 | |||||
| Declination | 47 40 38.02 (0.02) | 47 40 38.05 (0.03) | 47 40 38.02 | 47 40 38.99 (0.02) | 47 41 29.04 | |||||
| Spectral type | DA | DA: | DA.8 | DA1 | ||||||
| Effective temperature | [K] | 62000.0 (1195) | 60920.0 (1220) | 24303.0 (264) | ||||||
| log(g) | [cgs] | 7.63 (0.06) | 7.58 (0.07) | 6.73 (0.01) | ||||||
| Mass | [M☉] | 0.57 (0.02) | 0.55 (0.02) | 0.238 (0.005) | ||||||
| log(Luminosity) | [L☉] | 0.70 | ||||||||
| Cooling age | [Gyr] | 0.0011 | ||||||||
| 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] | 4.45 (0.04) | 4.61 (0.06) | 4.45 | 4.45 (0.04) | |||||
| Distance | [pc] | 224.57 (2) | 216.94 (3) | 246.00 | 259.00 | 224.57 | 224.57 (2) | |||
| Composition | H | |||||||||
| Proper motion (right ascension) | [mas/yr] | -32.23239552 (0.04) | -32.06897504 (0.09) | -32.232 (0.04) | ||||||
| Proper motion (declination) | [mas/yr] | -60.71101039 (0.04) | -60.70136136 (0.07) | -60.711 (0.04) | ||||||
| Variability | ||||||||||
| Magnetic | ||||||||||
| Bd | [MG] | |||||||||
| Infrared excess (disk) | ||||||||||
| Binarity | ||||||||||
| B magnitude | 15.42 | |||||||||
| V magnitude | 15.22 | |||||||||
| R magnitude | ||||||||||
| I magnitude | ||||||||||
| J magnitude | 14.59 (0.03) | |||||||||
| H magnitude | 14.16 (0.04) | |||||||||
| K magnitude | 13.88 (0.05) | |||||||||
| u magnitude | 14.64 (0.004) | -0.39 | ||||||||
| g magnitude | 15.00 (0.003) | |||||||||
| r magnitude | 15.46 (0.004) | |||||||||
| i magnitude | 15.57 (0.004) | |||||||||
| z magnitude | 15.50 (0.006) | |||||||||
| G magnitude | 15.18 (0.002) | 15.19 | 15.18 | 15.18 (0.003) | ||||||
| BP magnitude | 15.10 (0.002) | 15.04 | ||||||||
| RP magnitude | 15.20 (0.002) | 15.21 | ||||||||
| Pan g magnitude | 15.10 (0.002) | |||||||||
| Pan r magnitude | 15.47 (0.002) | |||||||||
| Pan i magnitude | 15.58 (0.003) | |||||||||
| Pan z magnitude | 15.55 (0.004) | |||||||||
| Pan y magnitude | 15.48 (0.005) | |||||||||
| E(B-V) | 0.013 | |||||||||
* 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.