All names: HS0447+7545, Gaia EDR3 551708031143551232, UCAC4 830-008040, Gaia DR3 551708207239316352, HS 0447+7545, 2MASS J04542391+7550449, TIC 140734225, GALEX J045423.9+755045, Gaia DR2 551708207239316352
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 04 54 11.11 (0.2) | 04 54 23.92 | 04 54 23.90 (0.03) | ||
| Declination | 75 49 50.11 (0.3) | 75 50 44.72 | 75 50 44.98 (0.03) | ||
| Spectral type | sdB | sdB | |||
| Effective temperature | [K] | 30000.0 (1300) | |||
| log(g) | [cgs] | 5.40 (0.2) | |||
| Mass | [M☉] | ||||
| log(Luminosity) | [L☉] | ||||
| Cooling age | [Gyr] | ||||
| log(H/He) | |||||
| log(C/He) | |||||
| log(Ca/He) | |||||
| log(Ca/H) | |||||
| Parallax | [mas] | 2.18 (0.3) | 0.71 (0.05) | 0.66 (0.03) | |
| Distance | [pc] | 459.47 (63) | 1409.64 (102) | 1512.86 (73) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | -6.758 (0.2) | -0.493 (0.08) | -0.484 (0.03) | |
| Proper motion (declination) | [mas/yr] | -4.527 (0.3) | 4.173 (0.09) | 4.139 (0.03) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | 15.65 (0.1) | ||||
| V magnitude | 15.73 (0.2) | ||||
| R magnitude | 16.05 (0.2) | ||||
| I magnitude | |||||
| J magnitude | 16.05 (0.1) | 16.05 (0.1) | |||
| H magnitude | 15.99 | ||||
| K magnitude | 16.36 | ||||
| u magnitude | |||||
| g magnitude | 15.67 (0.07) | ||||
| r magnitude | 15.84 (0.02) | ||||
| i magnitude | |||||
| z magnitude | |||||
| G magnitude | 19.72 (0.004) | 15.76 (0.0006) | 15.74 (0.003) | ||
| BP magnitude | 19.79 (0.05) | 15.67 (0.004) | |||
| RP magnitude | 19.60 (0.05) | 15.82 (0.003) | |||
| Pan g magnitude | 15.65 (0.003) | ||||
| Pan r magnitude | 15.87 (0.003) | ||||
| Pan i magnitude | 16.13 (0.003) | ||||
| Pan z magnitude | 16.32 (0.003) | ||||
| Pan y magnitude | 16.43 (0.01) | ||||
| E(B-V) | 0.133 | ||||
* 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.