All names: USNO-B1.0 1133-00289581, SDSS J180302.57+232043.3, LSPM J1803+2320, Gaia EDR3 4577545533852426624, J1803+2320, Gaia DR3 4577545533852426624, WDJ180302.55+232044.14, Gaia DR2 4577545533852426624
| Parameter | Unit | Gaia EDR3 | SDSS DR12 | Caron et al. 2023 | Blouin & Dufour 2019 | Gaia DR2 | Stilism | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 18 03 02.61 (0.1) | 18 03 02.57 | 18 03 02.61 (0.2) | 18 03 02.61 | 18 03 02.55 (0.1) | 18 03 02.61 | 18 03 02.57 | |||||
| Declination | 23 20 41.22 (0.2) | 23 20 43.31 | 23 20 41.32 (0.3) | 23 20 41.22 | 23 20 44.18 (0.2) | 23 20 41.32 | 23 20 43.31 | |||||
| Spectral type | DQ | DQpec | DQ: | DQpec | DQPEC | DQ | ||||||
| Effective temperature | [K] | 4230.0 (15) | 4400.0 (67) | 5556.0 (35) | 6300.0 (3) | |||||||
| log(g) | [cgs] | 7.28 (0.04) | 7.69 (0.09) | 8.25 (0.02) | 10.00 (0.003) | |||||||
| Mass | [M☉] | 0.237 (0.01) | 0.4 (0.04) | 0.731 (0.02) | ||||||||
| log(Luminosity) | [L☉] | |||||||||||
| Cooling age | [Gyr] | 2.7300 | ||||||||||
| log(H/He) | ||||||||||||
| log(C/He) | -8.21 | -7.787 (0.02) | ||||||||||
| log(Ca/He) | ||||||||||||
| log(Ca/H) | ||||||||||||
| log(N/He) | ||||||||||||
| log(O/He) | ||||||||||||
| 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] | 14.90 (0.2) | 15.33 (0.3) | 15.33 (0.3) | 15.33 (0.3) | 14.90 | 14.90 (0.2) | 15.33 (0.3) | ||||
| Distance | [pc] | 67.10 (1) | 65.23 (1) | 65.21 (1) | 65.21 (1) | 67.10 | 67.10 (1) | 65.21 (1) | ||||
| Composition | He | He | ||||||||||
| Proper motion (right ascension) | [mas/yr] | 53.5414072 (0.2) | 52.56001093 (0.3) | 53.541 (0.2) | 52.56001093 | |||||||
| Proper motion (declination) | [mas/yr] | -184.6121919 (0.2) | -182.3345329 (0.6) | -184.612 (0.2) | -182.3345329 | |||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | ||||||||||||
| B magnitude | 19.90 | |||||||||||
| V magnitude | ||||||||||||
| R magnitude | 18.60 | |||||||||||
| I magnitude | ||||||||||||
| J magnitude | 17.13 (0.02) | |||||||||||
| H magnitude | ||||||||||||
| K magnitude | ||||||||||||
| u magnitude | 21.41 (0.1) | 21.41 (0.03) | 21.41 (0.1) | 21.41 (0.1) | 21.41 (0.1) | 21.71 (0.2) | ||||||
| g magnitude | 20.44 (0.02) | 20.44 (0.02) | 20.44 (0.02) | 20.44 (0.02) | 21.14 (0.1) | |||||||
| r magnitude | 19.02 (0.01) | 19.02 (0.01) | 19.02 (0.01) | 19.02 (0.01) | 19.01 (0.02) | |||||||
| i magnitude | 18.74 (0.01) | 18.74 (0.01) | 18.74 (0.01) | 18.74 (0.01) | 18.84 (0.04) | |||||||
| z magnitude | 18.63 (0.04) | 18.63 (0.04) | 18.63 (0.04) | 18.63 (0.04) | 18.64 (0.07) | |||||||
| G magnitude | 19.17 (0.04) | 19.19 | 19.17 | 19.16 (0.004) | 19.19 | |||||||
| BP magnitude | 19.74 (0.04) | 19.51 | 19.51 | |||||||||
| RP magnitude | 18.11 (0.02) | 18.02 | 18.02 | |||||||||
| Pan g magnitude | 20.15 (0.02) | |||||||||||
| Pan r magnitude | 18.85 (0.01) | |||||||||||
| Pan i magnitude | 18.51 (0.02) | |||||||||||
| Pan z magnitude | 18.27 (0.02) | |||||||||||
| Pan y magnitude | 18.19 (0.02) | |||||||||||
| E(B-V) | 0.008 | |||||||||||
* 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.