All names: SDSS J173928.43+502925.0, Gaia DR2 1368015532671476736, 2MASS J17392843+5029251, [TFW97] J173928.44+502925.11, WISEA J173928.42+502925.1, PG 1738+505, PG1738+505, Gaia DR3 1368015532671476736, SDSS J173928.42+502925.0, UCAC4 703-058013, WISE J173928.42+502925.1, TIC 284967922
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 17 39 28.43 | 17 39 28.43 (0.02) | ||
| Declination | 50 29 25.10 | 50 29 25.11 (0.03) | ||
| Spectral type | sdB | sdB1.5VIIHe12 | ||
| 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] | 1.38 (0.03) | 1.43 (0.02) | |
| Distance | [pc] | 722.18 (18) | 701.16 (12) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -9.267 (0.07) | -9.216 (0.03) | |
| Proper motion (declination) | [mas/yr] | 2.667 (0.08) | 2.489 (0.03) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 13.12 (0.02) | |||
| V magnitude | 13.21 (0.05) | |||
| R magnitude | 13.46 (0.07) | |||
| I magnitude | ||||
| J magnitude | 13.67 (0.03) | 13.67 (0.03) | ||
| H magnitude | 13.84 (0.04) | 13.84 (0.04) | ||
| K magnitude | 13.91 (0.05) | 13.91 (0.05) | ||
| u magnitude | 14.17 (0.006) | |||
| g magnitude | 13.21 (0.002) | 13.04 (0.04) | ||
| r magnitude | 13.56 (0.002) | 13.44 (0.02) | ||
| i magnitude | 14.31 (0.008) | 13.71 (0.05) | ||
| z magnitude | 14.28 (0.006) | |||
| G magnitude | 13.19 (0.0006) | 13.18 (0.003) | ||
| BP magnitude | 13.00 (0.007) | |||
| RP magnitude | 13.39 (0.002) | |||
| Pan g magnitude | 13.09 | |||
| Pan r magnitude | 13.48 | |||
| Pan i magnitude | 13.74 (0.006) | |||
| Pan z magnitude | 14.00 (0.002) | |||
| Pan y magnitude | 14.14 (0.004) | |||
| E(B-V) | 0.030 | |||
* 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.