All names: SDSS J124201.73+434023.1, PG 1239+439, LAMOST J124201.73+434023.3, SDSS J124201.73+434023.3, Gaia DR2 1540495440685138432, GALEX J124201.7+434023, Ton 107, FBS 1239+439, Gaia EDR3 1540495440685138432, Gaia DR3 1540495440685138432, PG1239+439, FBS B 310, USNO-B1.0 1336-00235347
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Geier 2020 | Gaia DR2 | Stilism | Simbad | Eisenstein et al. 2006 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 12 42 01.72 (0.04) | 12 42 01.73 | 12 42 01.78 | 12 42 01.72 (0.04) | 12 42 01.73 (0.04) | 12 42 01.74 | |||
| Declination | 43 40 23.11 (0.04) | 43 40 23.33 | 43 40 24.38 | 43 40 23.12 (0.04) | 43 40 23.42 (0.04) | 43 40 23.32 | |||
| Spectral type | sdOB | sdBC0.2VIIHe27 | SDO | ||||||
| Effective temperature | [K] | 37400.0 (1720) | 37223.0 (385) | ||||||
| log(g) | [cgs] | 5.67 (0.2) | 5.38 (0.07) | ||||||
| Mass | [M☉] | ||||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | 0.41 (0.07) | 0.47 (0.08) | 0.47 (0.08) | 0.41 (0.07) | ||||
| Distance | [pc] | 2444.28 (409) | 2125.40 (355) | 2125.29 (355) | 2444.39 (409) | ||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -7.947011032 (0.05) | -7.841 (0.08) | -7.840976149 (0.08) | -7.947 (0.05) | -4.8 | |||
| Proper motion (declination) | [mas/yr] | -19.55399992 (0.06) | -19.681 (0.1) | -19.68112689 (0.1) | -19.554 (0.06) | -21.5 | |||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | 17.00 | ||||||||
| V magnitude | 16.82 | ||||||||
| R magnitude | 17.00 | ||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 16.33 (0.006) | 16.33 (0.006) | 16.33 (0.006) | 16.32 (0.02) | |||||
| g magnitude | 16.65 (0.004) | 16.65 (0.004) | 16.65 (0.004) | 16.67 (0.03) | |||||
| r magnitude | 17.16 (0.005) | 17.16 (0.005) | 17.16 (0.005) | 17.16 (0.009) | |||||
| i magnitude | 17.53 (0.006) | 17.52 (0.006) | 17.52 (0.006) | 17.54 (0.02) | |||||
| z magnitude | 17.87 (0.02) | 17.87 (0.02) | 17.87 (0.02) | 17.88 (0.02) | |||||
| G magnitude | 16.92 (0.003) | 16.94 (0.0009) | 16.94 | 16.92 (0.003) | |||||
| BP magnitude | 16.77 (0.003) | 16.69 (0.006) | 16.69 | ||||||
| RP magnitude | 17.22 (0.007) | 17.21 (0.009) | 17.21 | ||||||
| Pan g magnitude | 16.76 (0.004) | 16.76 (0.004) | |||||||
| Pan r magnitude | 17.18 (0.003) | 17.18 (0.003) | |||||||
| Pan i magnitude | 17.56 (0.003) | 17.56 (0.003) | |||||||
| Pan z magnitude | 17.86 (0.007) | 17.86 (0.007) | |||||||
| Pan y magnitude | 18.00 (0.01) | 18.00 (0.01) | |||||||
| E(B-V) | 0.019 | ||||||||
* 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.