All names: PLX 4274.01, WD 1831+197, SDSS J183358.35+194551.1, G184-12, Gaia DR3 4525569007873380736, LSPM J1833+1945, G 184-12, WDJ183358.35+194552.99, TIC 470998232, GEN# +9.80184012, Gaia DR2 4525569007873380736, PSO J278.4932+19.7635, Gaia EDR3 4525569007873380736, 2MASS J18335833+1945531, USNO 348, WD 1831+19, J1833+1945, SDSS J183358.36+194551.1, NLTT 46666, USNO-B1.0 1097-00320018
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Kilic et al. 2025 | O'Brien et al. 2024 | Caron et al. 2023 | McCleery et al. 2020 | Coutu et al. 2019 | Blouin et al. 2019 | Gaia DR2 | Stilism | Dufour et al. 2005 | Bergeron et al. 2001 | Wegner and Yackovich 1984 | Koester et al. 1982a | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 18 33 58.38 (0.02) | 18 33 58.38 (0.03) | 18 33 58.35 | 18 33 58.38 (0.03) | 18 33 58.38 | 18 33 58.35 (0.02) | 18 33 58.38 | 18 33 59.04 | |||||||||||
| Declination | 19 45 46.66 (0.03) | 19 45 46.86 (0.05) | 19 45 52.99 | 19 45 46.86 (0.05) | 19 45 46.66 | 19 45 52.99 (0.03) | 19 45 46.86 | 19 46 05.52 | |||||||||||
| Spectral type | DQ | DQ | DQ | DQ | DQ | DQ | DQ | DQ | DC | DQ | DQ6 | DQ | |||||||
| Effective temperature | [K] | 7295.0 (80) | 7236.0 (58) | 7110.0 (17) | 7235.9 (45) | 7124.0 (133) | 7305.0 (140) | 7110.0 (170) | 7590.0 (210) | 7000.0 | 7100.0 (300) | 7039.0 (21) | |||||||
| log(g) | [cgs] | 8.02 (0.02) | 7.99 (0.02) | 7.96 (0.005) | 8.00 (0.02) | 7.97 | 8.04 (0.04) | 7.38 (0.6) | 7.61 (0.5) | 7.93 (0.006) | |||||||||
| Mass | [M☉] | 0.585 (0.01) | 0.566 (0.01) | 0.553 (0.004) | 0.5558 | 0.597 (0.03) | 0.28 (0.2) | 0.37 (0.2) | 0.18 (0.3) | 0.534 (0.005) | |||||||||
| log(Luminosity) | [L☉] | -3.12 (0.2) | |||||||||||||||||
| Cooling age | [Gyr] | 1.4900 | 1.4200 | 1.4690 (0.1) | 0.8000 (0.4) | 1.0000 | |||||||||||||
| log(H/He) | <-2.7 | ||||||||||||||||||
| log(C/He) | -6.08 | -6.2 | -6.2011 (0.03) | -6.16 | -5.87 (0.2) | -5.5 | -7 | ||||||||||||
| log(Ca/He) | |||||||||||||||||||
| log(Ca/H) | |||||||||||||||||||
| log(N/He) | <-8 | ||||||||||||||||||
| log(O/He) | <-8 | ||||||||||||||||||
| 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] | 25.47 (0.04) | 25.47 (0.04) | 25.43 (0.05) | 25.43 (0.05) | 25.43 | 25.43 (0.05) | 25.43 (0.05) | 17.90 (5) | 0.02 | 25.47 | 25.47 (0.04) | 25.43 (0.05) | 17.90 (5) | |||||
| Distance | [pc] | 39.26 (0.07) | 39.26 (0.06) | 39.32 (0.08) | 39.33 (0.08) | 39.33 (0.08) | 39.33 (0.08) | 39.33 (0.08) | 55.87 (15) | 58823.53 | 39.26 | 39.26 (0.07) | 39.33 (0.08) | 55.87 (16) | |||||
| Composition | He | He | He | He | He | He | He | ||||||||||||
| Proper motion (right ascension) | [mas/yr] | 29.97967957 (0.03) | 29.94960433 (0.07) | 29.98 (0.03) | 29.94960433 | ||||||||||||||
| Proper motion (declination) | [mas/yr] | -395.6344121 (0.04) | -395.6165816 (0.1) | -395.634 (0.04) | -395.6165816 | ||||||||||||||
| Variability | |||||||||||||||||||
| Magnetic | |||||||||||||||||||
| Bd | [MG] | ||||||||||||||||||
| Infrared excess (disk) | |||||||||||||||||||
| Binarity | |||||||||||||||||||
| B magnitude | 16.70 | 16.71 | |||||||||||||||||
| V magnitude | 16.41 | ||||||||||||||||||
| R magnitude | 16.18 | 16.00 | |||||||||||||||||
| I magnitude | 16.04 | ||||||||||||||||||
| J magnitude | 15.93 (0.01) | 15.98 (0.1) | 15.93 | 15.98 (0.1) | |||||||||||||||
| H magnitude | 16.04 (0.2) | 16.04 (0.2) | 15.82 | 16.04 (0.2) | |||||||||||||||
| K magnitude | 15.61 (0.2) | 15.61 (0.2) | 15.81 | 15.61 (0.2) | |||||||||||||||
| u magnitude | 16.89 (0.007) | 16.89 (0.007) | 16.89 (0.007) | ||||||||||||||||
| g magnitude | 16.48 (0.004) | 16.48 (0.004) | |||||||||||||||||
| r magnitude | 16.41 (0.003) | 16.38 (0.004) | |||||||||||||||||
| i magnitude | 16.44 (0.007) | 16.40 (0.005) | |||||||||||||||||
| z magnitude | 16.47 (0.008) | 16.47 (0.008) | |||||||||||||||||
| G magnitude | 16.34 (0.002) | 16.36 | 16.36 | 16.34 | 16.34 (0.003) | 16.36 | |||||||||||||
| BP magnitude | 16.49 (0.002) | 16.48 | 16.48 | ||||||||||||||||
| RP magnitude | 16.08 (0.002) | 16.09 | 16.09 | ||||||||||||||||
| Pan g magnitude | 16.50 (0.003) | 16.50 (0.003) | 16.43 (0.01) | ||||||||||||||||
| Pan r magnitude | 16.40 (0.002) | 16.40 (0.002) | 16.41 (0.003) | ||||||||||||||||
| Pan i magnitude | 16.43 (0.001) | 16.43 (0.001) | 16.44 (0.007) | ||||||||||||||||
| Pan z magnitude | 16.50 (0.002) | 16.50 (0.003) | 16.52 (0.02) | ||||||||||||||||
| Pan y magnitude | 16.58 (0.008) | 16.58 (0.007) | 16.57 (0.01) | ||||||||||||||||
| E(B-V) | 0.002 | ||||||||||||||||||
* 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.