WD 1817+788
All names: HS 1817+7852, GALEX J181423.9+785403, SDSS J181424.13+785402.9, Gaia EDR3 2293913930823813888, Gaia DR2 2293913930823813888, SDSS J181424.14+785402.9, Gaia DR3 2293913930823813888, WD 1817+788, PSO J273.6004+78.9008, SDSS J181424.14+785403.0, SDSS J181424.12+785402.9
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | MWDD H | Gaia DR2 | Stilism | Vincent et al. 2024 | Simbad | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 18 14 24.08 (0.04) | 18 14 24.12 | 18 14 24.08 (0.05) | 18 14 24.08 | 18 14 24.14 (0.04) | 18 14 23.40 | 18 14 24.14 | ||||||
| Declination | 78 54 03.08 (0.04) | 78 54 02.91 | 78 54 03.08 (0.06) | 78 54 03.08 | 78 54 02.90 (0.04) | 78 54 03.60 | 78 54 02.98 | ||||||
| Spectral type | DA | DA | DA | DA | DA1.6 | DA | DA | ||||||
| Effective temperature | [K] | 31505.0 (116) | 26114.0 | 33310.0 (1033) | 31500.0 (39) | ||||||||
| log(g) | [cgs] | 7.81 (0.03) | 7.65 | 7.97 (0.03) | 7.81 (0.02) | ||||||||
| Mass | [M☉] | 0.55 (0.01) | 0.469 | 0.637 (0.02) | 0.56 (0.009) | ||||||||
| log(Luminosity) | [L☉] | -0.68 (0.02) | |||||||||||
| Cooling age | [Gyr] | 0.0074 (0.0002) | 0.0144 | ||||||||||
| 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] | 3.92 (0.04) | 3.89 (0.05) | 3.92 | 3.92 (0.04) | ||||||||
| Distance | [pc] | 254.89 (3) | 257.04 (3) | 254.89 | 254.89 (3) | ||||||||
| Composition | H | H | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -10.73797711 (0.06) | -11.04087738 (0.1) | -10.738 (0.06) | |||||||||
| Proper motion (declination) | [mas/yr] | 11.5348287 (0.06) | 11.29196428 (0.1) | 11.535 (0.06) | |||||||||
| Variability | |||||||||||||
| Magnetic | |||||||||||||
| Bd | [MG] | ||||||||||||
| Infrared excess (disk) | |||||||||||||
| Binarity | |||||||||||||
| B magnitude | |||||||||||||
| V magnitude | |||||||||||||
| R magnitude | |||||||||||||
| I magnitude | |||||||||||||
| J magnitude | |||||||||||||
| H magnitude | |||||||||||||
| K magnitude | |||||||||||||
| u magnitude | 16.23 (0.006) | 16.23 (0.006) | 16.24 (0.01) | ||||||||||
| g magnitude | 16.49 (0.004) | 16.49 (0.004) | 16.50 (0.02) | ||||||||||
| r magnitude | 16.96 (0.005) | 16.95 (0.005) | 16.96 (0.01) | ||||||||||
| i magnitude | 17.33 (0.006) | 17.33 (0.006) | 17.34 (0.02) | ||||||||||
| z magnitude | 17.65 (0.02) | 17.65 (0.02) | 17.65 (0.03) | ||||||||||
| G magnitude | 16.74 (0.005) | 16.77 | 16.74 | 16.74 (0.003) | |||||||||
| BP magnitude | 16.61 (0.005) | 16.57 | |||||||||||
| RP magnitude | 17.03 (0.008) | 17.03 | |||||||||||
| Pan g magnitude | 16.59 (0.004) | ||||||||||||
| Pan r magnitude | 17.00 (0.004) | ||||||||||||
| Pan i magnitude | 17.36 (0.003) | ||||||||||||
| Pan z magnitude | 17.63 (0.007) | ||||||||||||
| Pan y magnitude | 17.82 (0.02) | ||||||||||||
| E(B-V) | 0.018 | ||||||||||||
* Constant surface field
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