All names: UCAC4 577-001839, PG 0045+251, GALEX J004755.2+252028, SDSS J004755.27+252027.1, Gaia DR2 2808135727924877184, WISE J004755.27+252027.2, SDSSJ004755.27+252027.1, SDSS J004755.28+252027.1, Gaia DR3 2808135727924877184
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 00 47 55.27 | 00 47 55.28 (0.06) | ||
| Declination | 25 20 27.10 | 25 20 27.18 (0.04) | ||
| Spectral type | sdO | sdB | ||
| Effective temperature | [K] | 40330.0 (2000) | ||
| log(g) | [cgs] | 5.35 (0.2) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.42 (0.09) | 0.29 (0.06) | |
| Distance | [pc] | 2389.49 (497) | 3455.43 (758) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -1.926 (0.1) | -1.761 (0.08) | |
| Proper motion (declination) | [mas/yr] | -7.476 (0.1) | -7.195 (0.05) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | ||||
| V magnitude | ||||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | ||||
| H magnitude | ||||
| K magnitude | ||||
| u magnitude | 15.77 (0.005) | 15.77 (0.005) | ||
| g magnitude | 16.12 (0.004) | 16.11 (0.004) | ||
| r magnitude | 16.60 (0.004) | 16.60 (0.004) | ||
| i magnitude | 16.91 (0.006) | 16.91 (0.006) | ||
| z magnitude | 17.18 (0.01) | 17.18 (0.01) | ||
| G magnitude | 16.39 (0.002) | 16.37 (0.003) | ||
| BP magnitude | 16.16 (0.009) | |||
| RP magnitude | 16.61 (0.005) | |||
| Pan g magnitude | 16.19 (0.005) | |||
| Pan r magnitude | 16.61 (0.003) | |||
| Pan i magnitude | 16.95 (0.002) | |||
| Pan z magnitude | 17.19 (0.003) | |||
| Pan y magnitude | 17.35 (0.008) | |||
| E(B-V) | 0.054 | |||
* 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.