GD 18
All names: LAMOST J015259.14+010016.8, SDSS J015259.20+010018.5, 2MASS J01525919+0100182, SDSS J015259.18+010017.8, SDSS J015259.18+010017.7, Gaia DR2 2510891108771852416, SDSS J015259.18+010017.4, Gaia EDR3 2510891108771852416, WDJ015259.20+010018.10, USNO-B1.0 0910-00019847, HE 0150+0045, SDSS J015259.20+010018.4, GALEX J015259.1+010017, Gaia DR3 2510891108771852416, WD 0150+007, LSPM J0152+0100, GD 18, SDSS J015259.18+010017.5, J0152+0100, PHL 3911, [MMN2004c] WD J0152+0100, TIC 293561262, SDSS J015259.19+010018.4, SDSS J015259.19+010018.5
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Kilic et al. 2025 | Kilic et al. 2020 | MWDD H | Gaia DR2 | Stilism | Guo et al. 2015 | Tremblay et al. 2011 | Koester et al. 2009 | Mukadam et al. 2004 | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Kleinman et al. 2004 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 01 52 59.14 (0.06) | 01 52 59.18 | 01 52 59.14 (0.1) | 01 52 59.14 | 01 52 59.19 (0.06) | 01 52 59.14 | 01 52 59.19 | 01 52 59.23 | 01 52 59.19 | 01 52 59.20 | |||||||||||
| Declination | 01 00 15.44 (0.04) | 01 00 17.48 | 01 00 15.52 (0.07) | 01 00 15.44 | 01 00 18.10 (0.04) | 01 00 15.52 | 01 00 17.73 | 01 00 15.48 | 01 00 18.46 | 01 00 18.47 | |||||||||||
| Spectral type | DA | DA | DA | DA | DA | DA | DA | DA | DA | DA4.0 | DA | DA | |||||||||
| Effective temperature | [K] | 11002.0 (79) | 11002.0 (79) | 11349.0 | 13000.0 (458) | 13180.0 (100) | 12625.0 (95) | 12490.0 (70) | 11574.0 (158) | 12494.0 (71) | 12534.0 (65) | 12559.0 (75) | |||||||||
| log(g) | [cgs] | 7.95 (0.01) | 7.95 (0.01) | 7.99 | 8.02 (0.08) | 7.96 (0.02) | 7.71 (0.03) | 7.84 (0.02) | 8.03 (0.02) | 7.84 (0.02) | 7.90 (0.02) | 7.88 (0.02) | |||||||||
| Mass | [M☉] | 0.571 (0.008) | 0.572 (0.01) | 0.596 | 0.62 (0.05) | 0.59 (0.01) | 0.62 (0.01) | 0.555 (0.01) | |||||||||||||
| log(Luminosity) | [L☉] | ||||||||||||||||||||
| Cooling age | [Gyr] | 0.4246 | 0.2818 | ||||||||||||||||||
| 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] | 11.55 (0.07) | 11.55 (0.1) | 11.55 | 11.55 (0.07) | 11.55 (0.1) | |||||||||||||||
| Distance | [pc] | 86.60 (0.5) | 86.57 (0.8) | 86.60 | 86.60 (0.5) | 86.57 (0.8) | |||||||||||||||
| Composition | H | H | H | ||||||||||||||||||
| Proper motion (right ascension) | [mas/yr] | -49.0146349 (0.09) | -49.00560941 (0.2) | -49.015 (0.09) | -49.006 | -50.1 | -53.0 | ||||||||||||||
| Proper motion (declination) | [mas/yr] | -166.0196293 (0.05) | -166.020584 (0.1) | -166.02 (0.05) | -166.021 | -161.2 | -163.0 | ||||||||||||||
| Variability | NOV | ||||||||||||||||||||
| Magnetic | |||||||||||||||||||||
| Bd | [MG] | ||||||||||||||||||||
| Infrared excess (disk) | |||||||||||||||||||||
| Binarity | |||||||||||||||||||||
| B magnitude | 16.40 | 17.00 | |||||||||||||||||||
| V magnitude | |||||||||||||||||||||
| R magnitude | 18.60 | ||||||||||||||||||||
| I magnitude | |||||||||||||||||||||
| J magnitude | 16.53 (0.02) | ||||||||||||||||||||
| H magnitude | 16.65 (0.04) | ||||||||||||||||||||
| K magnitude | 16.62 (0.06) | ||||||||||||||||||||
| u magnitude | 16.92 (0.008) | 16.92 (0.008) | 16.92 (0.008) | 16.95 (0.04) | 16.96 | 16.94 (0.04) | 16.96 (0.05) | ||||||||||||||
| g magnitude | 16.41 (0.004) | 16.43 | 16.41 (0.004) | 16.41 (0.004) | 16.42 (0.02) | 16.43 | 16.42 (0.02) | 16.43 (0.02) | |||||||||||||
| r magnitude | 16.58 (0.004) | 16.58 (0.004) | 16.57 (0.004) | 16.58 (0.02) | 16.59 | 16.59 (0.02) | 16.59 (0.02) | ||||||||||||||
| i magnitude | 16.76 (0.005) | 16.76 (0.005) | 16.74 (0.005) | 16.75 (0.01) | 16.75 | 16.75 (0.02) | 16.75 (0.02) | ||||||||||||||
| z magnitude | 16.98 (0.01) | 16.98 (0.01) | 16.96 (0.01) | 16.94 (0.02) | 16.94 | 16.94 (0.02) | 16.94 (0.02) | ||||||||||||||
| G magnitude | 16.48 (0.005) | 16.50 | 16.48 | 16.48 (0.003) | 16.50 | ||||||||||||||||
| BP magnitude | 16.51 (0.005) | 16.52 | 16.52 | ||||||||||||||||||
| RP magnitude | 16.48 (0.009) | 16.49 | 16.49 | ||||||||||||||||||
| Pan g magnitude | 16.43 (0.007) | ||||||||||||||||||||
| Pan r magnitude | 16.57 (0.003) | ||||||||||||||||||||
| Pan i magnitude | 16.77 (0.002) | ||||||||||||||||||||
| Pan z magnitude | 16.99 (0.004) | ||||||||||||||||||||
| Pan y magnitude | 17.12 (0.007) | ||||||||||||||||||||
| E(B-V) | 0.006 | ||||||||||||||||||||
* Constant surface field
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