All names: Gaia DR2 2253326146279942144, SDSS J184359.81+634651.7, GALEX J184359.8+634652, USNO-B1.0 1537-00231210, SDSS J184359.80+634651.8, Gaia DR3 2253326146279942144, Gaia EDR3 2253326146279942144, SDSSJ184359.81+634651.7, NAME HS 1844+637
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 18 43 59.81 (0.04) | 18 43 59.81 | 18 43 59.81 (0.04) | ||
| Declination | 63 46 51.63 (0.04) | 63 46 51.71 | 63 46 51.70 (0.04) | ||
| Spectral type | He-sdOB | sdB1VIIHe39 | |||
| Effective temperature | [K] | 39000.0 | |||
| log(g) | [cgs] | 5.50 | |||
| Mass | [M☉] | ||||
| log(Luminosity) | [L☉] | ||||
| Cooling age | [Gyr] | ||||
| log(H/He) | |||||
| log(C/He) | |||||
| log(Ca/He) | |||||
| log(Ca/H) | |||||
| Parallax | [mas] | 0.34 (0.04) | 0.38 (0.05) | 0.34 (0.04) | |
| Distance | [pc] | 2927.40 (357) | 2613.70 (344) | 2927.40 (357) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | 1.748 (0.06) | 1.744 (0.1) | 1.748 (0.06) | |
| Proper motion (declination) | [mas/yr] | -4.449 (0.06) | -4.566 (0.1) | -4.449 (0.06) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | 16.30 | ||||
| V magnitude | |||||
| R magnitude | 16.90 | ||||
| I magnitude | |||||
| J magnitude | |||||
| H magnitude | |||||
| K magnitude | |||||
| u magnitude | 16.03 (0.005) | 16.03 (0.005) | |||
| g magnitude | 16.38 (0.004) | 16.38 (0.004) | |||
| r magnitude | 16.82 (0.005) | 16.82 (0.005) | |||
| i magnitude | 17.17 (0.006) | 17.17 (0.006) | |||
| z magnitude | 17.46 (0.01) | 17.46 (0.01) | |||
| G magnitude | 16.59 (0.003) | 16.62 (0.002) | 16.59 (0.003) | ||
| BP magnitude | 16.46 (0.005) | 16.37 (0.01) | |||
| RP magnitude | 16.87 (0.01) | 16.84 (0.008) | |||
| Pan g magnitude | 16.44 (0.002) | ||||
| Pan r magnitude | 16.85 (0.004) | ||||
| Pan i magnitude | 17.19 (0.002) | ||||
| Pan z magnitude | 17.45 (0.004) | ||||
| Pan y magnitude | 17.63 (0.007) | ||||
| E(B-V) | 0.041 | ||||
* 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.