All names: PHL 189, SDSS J215307.34-071948.3, USNO-B1.0 0826-00803007, Gaia DR3 2666866350819437824, Gaia EDR3 2666866350819437824, Gaia DR2 2666866350819437824, SDSSJ215307.34-071948.3, PHL 4978, GALEX J215307.3-071947, SDSS J215307.34-071948.4
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Geier 2020 | Gaia DR2 | Stilism | Simbad | Eisenstein et al. 2006 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 21 53 07.35 (0.09) | 21 53 07.34 | 21 53 07.34 | 21 53 07.35 (0.1) | 21 53 07.34 (0.09) | 21 53 07.34 | |||
| Declination | -07 19 48.39 (0.08) | -07 19 48.39 | -07 19 48.30 | -07 19 48.39 (0.1) | -07 19 48.38 (0.08) | -07 19 48.41 | |||
| Spectral type | sdB | sdB | SDB | ||||||
| Effective temperature | [K] | 33100.0 (1300) | 32516.0 (252) | ||||||
| log(g) | [cgs] | 5.74 (0.1) | 5.80 (0.05) | ||||||
| Mass | [M☉] | ||||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | 0.37 (0.09) | 0.06 (0.2) | 0.06 (0.2) | 0.37 (0.09) | ||||
| Distance | [pc] | 2729.63 (690) | 17391.30 (51297) | 17387.43 (51263) | 2729.26 (690) | ||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | 1.225902441 (0.1) | 1.821 (0.3) | 1.820554882 (0.3) | 1.226 (0.1) | -0.3 | |||
| Proper motion (declination) | [mas/yr] | -0.426133082 (0.08) | -0.232 (0.2) | -0.231573336 (0.2) | -0.426 (0.08) | -1.1 | |||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | 17.40 | ||||||||
| V magnitude | 17.30 | ||||||||
| R magnitude | 17.30 | ||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 16.75 (0.007) | 16.75 (0.007) | 16.75 (0.007) | 16.75 (0.02) | |||||
| g magnitude | 16.85 (0.004) | 16.85 (0.004) | 16.85 (0.004) | 16.88 (0.02) | |||||
| r magnitude | 17.30 (0.005) | 17.30 (0.005) | 17.30 (0.005) | 17.34 (0.01) | |||||
| i magnitude | 17.60 (0.007) | 17.60 (0.007) | 17.60 (0.007) | 17.62 (0.01) | |||||
| z magnitude | 17.86 (0.02) | 17.86 (0.02) | 17.86 (0.02) | 17.89 (0.03) | |||||
| G magnitude | 17.06 (0.006) | 17.09 (0.002) | 17.09 | 17.06 (0.003) | |||||
| BP magnitude | 16.96 (0.006) | 16.90 (0.006) | 16.90 | ||||||
| RP magnitude | 17.27 (0.02) | 17.25 (0.01) | 17.25 | ||||||
| Pan g magnitude | 16.91 (0.005) | 16.91 (0.005) | |||||||
| Pan r magnitude | 17.29 (0.003) | 17.29 (0.003) | |||||||
| Pan i magnitude | 17.62 (0.003) | 17.62 (0.003) | |||||||
| Pan z magnitude | 17.86 (0.004) | 17.86 (0.004) | |||||||
| Pan y magnitude | 18.03 (0.03) | 18.03 (0.03) | |||||||
| E(B-V) | 0.042 | ||||||||
* 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.