All names: HIDDEN NAME PG 1638+675, 2MASS J16384370+6728084, WISE J163843.74+672808.5, HS 1638+6733, WISEA J163843.75+672808.5, TIC 230119235, Gaia DR2 1648476652285893248, FBS 1638+676, FBS B 847, UCAC4 788-025664, PG1638+675, GALEX J163843.7+672808, PG 1638+676, Gaia DR3 1648476656582002176
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 16 38 43.81 | 16 38 43.74 (0.04) | ||
| Declination | 67 28 08.36 | 67 28 08.37 (0.05) | ||
| Spectral type | He-sdO | sdOC | ||
| Effective temperature | [K] | |||
| log(g) | [cgs] | |||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.24 (0.05) | 0.32 (0.05) | |
| Distance | [pc] | 4249.89 (918) | 3148.61 (454) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -7.877 (0.09) | -7.826 (0.06) | |
| Proper motion (declination) | [mas/yr] | -2.617 (0.1) | -2.751 (0.06) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 15.68 (0.01) | |||
| V magnitude | 15.97 (0.07) | |||
| R magnitude | 16.52 | |||
| I magnitude | ||||
| J magnitude | 16.59 (0.1) | 16.59 (0.1) | ||
| H magnitude | 16.88 | |||
| K magnitude | 15.59 | |||
| u magnitude | ||||
| g magnitude | 15.71 (0.01) | |||
| r magnitude | 16.31 (0.01) | |||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 16.10 (0.002) | 16.09 (0.003) | ||
| BP magnitude | 15.86 (0.009) | |||
| RP magnitude | 16.36 (0.005) | |||
| Pan g magnitude | 15.91 (0.008) | |||
| Pan r magnitude | 16.32 (0.003) | |||
| Pan i magnitude | 16.69 (0.004) | |||
| Pan z magnitude | 16.97 (0.005) | |||
| Pan y magnitude | 17.16 (0.02) | |||
| E(B-V) | 0.023 | |||
* 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.