All names: TON 21, Ton 21, SDSS J094250.63+260059.7, Gaia DR2 646608632082864256, 1SWASP J094250.60+260100.1, GEN# +6.10070021, Gaia DR3 646608632082864256, UBV M 43103, WD 0939+262, 2MASS J09425065+2600599, Gaia EDR3 646608632082864256, PG 0939+262, GALEX J094250.7+260058, TIC 233432206
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Gaia DR2 | Stilism | Gianninas et al. 2011 | Liebert et al. 2005 | Vincent et al. 2024 | Simbad | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 09 42 50.61 (0.05) | 09 42 50.61 (0.06) | 09 42 50.61 | 09 42 50.64 (0.05) | 09 42 51.38 | |||||
| Declination | 26 00 59.54 (0.04) | 26 00 59.55 (0.07) | 26 00 59.54 | 26 00 59.84 (0.04) | 26 00 57.60 | |||||
| Spectral type | DA | DA | DA.7 | DA1 | ||||||
| Effective temperature | [K] | 70580.0 (1452) | 67930.0 (1366) | 155114.0 (15057) | ||||||
| log(g) | [cgs] | 7.94 (0.07) | 7.82 (0.07) | 8.65 (0.1) | ||||||
| Mass | [M☉] | 0.71 (0.03) | 0.65 (0.03) | 2.77 (0.5) | ||||||
| log(Luminosity) | [L☉] | 0.71 | ||||||||
| Cooling age | [Gyr] | 0.0010 | ||||||||
| 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] | 5.45 (0.06) | 5.60 (0.08) | 5.45 | 5.45 (0.06) | |||||
| Distance | [pc] | 183.62 (2) | 178.53 (2) | 155.00 | 171.00 | 183.62 | 183.61 (2) | |||
| Composition | H | |||||||||
| Proper motion (right ascension) | [mas/yr] | -20.81061222 (0.05) | -20.46517557 (0.1) | -20.811 (0.05) | ||||||
| Proper motion (declination) | [mas/yr] | -19.19957143 (0.05) | -19.26165732 (0.1) | -19.2 (0.05) | ||||||
| Variability | ||||||||||
| Magnetic | ||||||||||
| Bd | [MG] | |||||||||
| Infrared excess (disk) | ||||||||||
| Binarity | ||||||||||
| B magnitude | 14.18 | |||||||||
| V magnitude | 14.65 | 14.53 | ||||||||
| R magnitude | ||||||||||
| I magnitude | ||||||||||
| J magnitude | 15.36 (0.06) | |||||||||
| H magnitude | 15.57 (0.2) | |||||||||
| K magnitude | ||||||||||
| u magnitude | 13.91 (0.01) | |||||||||
| g magnitude | 14.38 (0.02) | |||||||||
| r magnitude | 14.88 (0.02) | |||||||||
| i magnitude | 15.29 (0.01) | |||||||||
| z magnitude | 15.62 (0.02) | |||||||||
| G magnitude | 14.62 (0.001) | 14.63 | 14.62 | 14.62 (0.003) | ||||||
| BP magnitude | 14.44 (0.001) | 14.37 | ||||||||
| RP magnitude | 14.96 (0.002) | 14.96 | ||||||||
| Pan g magnitude | 14.43 (0.002) | |||||||||
| Pan r magnitude | 14.90 (0.002) | |||||||||
| Pan i magnitude | 15.29 (0.002) | |||||||||
| Pan z magnitude | 15.59 (0.003) | |||||||||
| Pan y magnitude | 15.78 (0.006) | |||||||||
| E(B-V) | 0.011 | |||||||||
* 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.