All names: PG1242+241, Gaia DR3 3956305349435241856, PG 1242+241, TIC 347346961, Ton 640, GALEX J124506.0+235224, 2MASS J12450596+2352242, Gaia DR2 3956305349435241856
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 12 45 05.96 | 12 45 05.95 (0.04) | ||
| Declination | 23 52 24.40 | 23 52 23.95 (0.03) | ||
| Spectral type | sdB | sdB | ||
| 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] | 0.16 (0.07) | 0.09 (0.05) | |
| Distance | [pc] | 6426.74 (2982) | 11682.24 (6483) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -1.413 (0.1) | -1.392 (0.05) | |
| Proper motion (declination) | [mas/yr] | -6.162 (0.07) | -6.016 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 14.50 | |||
| V magnitude | ||||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 15.92 (0.08) | 15.92 (0.08) | ||
| H magnitude | 16.29 (0.2) | 16.29 (0.2) | ||
| K magnitude | 15.04 | |||
| u magnitude | 14.68 (0.004) | |||
| g magnitude | 15.02 (0.004) | |||
| r magnitude | 15.56 (0.004) | |||
| i magnitude | 15.90 (0.005) | |||
| z magnitude | 16.21 (0.007) | |||
| G magnitude | 15.30 (0.0007) | 15.29 (0.003) | ||
| BP magnitude | 15.06 (0.006) | |||
| RP magnitude | 15.58 (0.003) | |||
| Pan g magnitude | 15.11 (0.002) | |||
| Pan r magnitude | 15.55 (0.003) | |||
| Pan i magnitude | 15.91 (0.004) | |||
| Pan z magnitude | 16.20 (0.004) | |||
| Pan y magnitude | 16.37 (0.003) | |||
| E(B-V) | 0.018 | |||
* 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.