All names: SDSS J144239.68+401319.1, NLTT 38189, LP 221-303, WD 1440+404, Gaia DR3 1488064949540111104, SDSS J144239.69+401319.2, USNO-B1.0 1302-00245056, Gaia DR2 1488064949540111104, LSPM J1442+4013, SDSS J144239.69+401319.1, J1442+4013, WDJ144239.74+401319.38, Gaia EDR3 1488064949540111104
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Kilic et al. 2025 | Caron et al. 2023 | Gaia DR2 | Stilism | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 14 42 39.46 (0.1) | 14 42 39.47 (0.1) | 14 42 39.46 | 14 42 39.74 (0.1) | 14 42 39.47 | 14 42 39.00 | |||||
| Declination | 40 13 18.02 (0.1) | 40 13 18.06 (0.2) | 40 13 18.02 | 40 13 19.38 (0.1) | 40 13 18.06 | 40 13 17.04 | |||||
| Spectral type | DQ | DQP | DA | DQpec | DQpec8.8 | ||||||
| Effective temperature | [K] | 5379.0 (24) | 5704.0 (23) | 5370.0 (77) | |||||||
| log(g) | [cgs] | 7.91 (0.02) | 8.13 (0.02) | 7.92 (0.04) | |||||||
| Mass | [M☉] | 0.515 (0.01) | 0.653 (0.02) | 0.533 (0.03) | |||||||
| log(Luminosity) | [L☉] | ||||||||||
| Cooling age | [Gyr] | 4.5700 | |||||||||
| log(H/He) | |||||||||||
| log(C/He) | -6.94 | -6.6 | |||||||||
| 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] | 12.59 (0.2) | 12.51 (0.2) | 12.51 (0.2) | 12.59 | 12.59 (0.2) | 12.51 (0.2) | ||||
| Distance | [pc] | 79.46 (1) | 79.94 (1) | 79.94 (1) | 79.46 | 79.46 (1) | 79.94 (1) | ||||
| Composition | He | He | |||||||||
| Proper motion (right ascension) | [mas/yr] | -202.0460947 (0.1) | -201.9889912 (0.3) | -202.046 (0.1) | -201.9889912 | ||||||
| Proper motion (declination) | [mas/yr] | -84.79774575 (0.2) | -84.94736272 (0.3) | -84.798 (0.2) | -84.94736271 | ||||||
| Variability | |||||||||||
| Magnetic | |||||||||||
| Bd | [MG] | ||||||||||
| Infrared excess (disk) | |||||||||||
| Binarity | |||||||||||
| B magnitude | 20.00 | ||||||||||
| V magnitude | |||||||||||
| R magnitude | 19.10 | ||||||||||
| I magnitude | |||||||||||
| J magnitude | 18.15 (0.04) | 18.15 (0.04) | |||||||||
| H magnitude | 18.24 (0.05) | 18.24 (0.05) | |||||||||
| K magnitude | 18.20 (0.08) | 18.20 (0.08) | |||||||||
| u magnitude | 20.30 (0.04) | 20.19 (0.04) | 20.30 (0.04) | 20.15 | |||||||
| g magnitude | 19.45 (0.01) | 19.46 (0.01) | 19.47 | ||||||||
| r magnitude | 18.81 (0.009) | 18.82 (0.01) | 18.81 | ||||||||
| i magnitude | 18.65 (0.01) | 18.63 (0.01) | 18.66 | ||||||||
| z magnitude | 18.61 (0.03) | 18.64 (0.03) | 18.63 | ||||||||
| G magnitude | 18.88 (0.02) | 18.91 | 18.88 | 18.88 (0.003) | 18.91 | ||||||
| BP magnitude | 19.31 (0.02) | 19.27 | 19.27 | ||||||||
| RP magnitude | 18.35 (0.02) | 18.33 | 18.33 | ||||||||
| Pan g magnitude | 19.45 (0.01) | 19.45 (0.01) | |||||||||
| Pan r magnitude | 18.80 (0.007) | 18.80 (0.006) | |||||||||
| Pan i magnitude | 18.65 (0.004) | 18.65 (0.005) | |||||||||
| Pan z magnitude | 18.64 (0.01) | 18.64 (0.01) | |||||||||
| Pan y magnitude | 18.67 (0.02) | 18.67 (0.02) | |||||||||
| E(B-V) | 0.009 | ||||||||||
* 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.