All names: PG 2355+242, SDSS J235745.41+242622.46, SDSS J235745.40+242622.5, USNO-B1.0 1144-00574845, Gaia EDR3 2851511427281425536, Gaia DR2 2851511427281425536, SDSS J235745.41+242622.4, GALEX J235745.4+242622, PG2355+242, LAMOST J235745.40+242622.5, SDSS J235745.40+242622.4, Gaia DR3 2851511427281425536
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Geier 2020 | Gaia DR2 | Stilism | Kepler et al. 2016 | Simbad |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 23 57 45.40 (0.05) | 23 57 45.41 | 23 57 45.42 | 23 57 45.40 (0.08) | 23 57 45.41 (0.05) | ||||
| Declination | 24 26 22.35 (0.04) | 24 26 22.49 | 24 26 22.90 | 24 26 22.36 (0.04) | 24 26 22.49 (0.04) | ||||
| Spectral type | sdOB | sdO | sdOB | ||||||
| Effective temperature | [K] | 53970.0 (6490) | 47062.0 (487) | ||||||
| log(g) | [cgs] | 5.61 (0.07) | 5.88 (0.04) | ||||||
| Mass | [M☉] | ||||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | 0.40 (0.07) | 0.37 (0.1) | 0.37 (0.1) | 0.40 (0.07) | ||||
| Distance | [pc] | 2489.99 (411) | 2691.07 (751) | 2690.95 (751) | 2490.04 (410) | ||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -1.730054786 (0.07) | -1.924 (0.3) | -1.924487806 (0.3) | -1.73 (0.07) | ||||
| Proper motion (declination) | [mas/yr] | -8.601793653 (0.04) | -8.487 (0.08) | -8.487140738 (0.08) | -8.602 (0.04) | ||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | 16.30 | ||||||||
| V magnitude | |||||||||
| R magnitude | 16.00 | ||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 15.89 (0.005) | 15.89 (0.005) | 15.89 (0.02) | 15.89 (0.02) | |||||
| g magnitude | 16.12 (0.004) | 16.13 (0.004) | 16.17 (0.02) | 16.17 (0.02) | |||||
| r magnitude | 16.53 (0.005) | 16.53 (0.005) | 16.52 (0.01) | 16.52 (0.01) | |||||
| i magnitude | 16.80 (0.005) | 16.80 (0.005) | 16.82 (0.01) | 16.82 (0.01) | |||||
| z magnitude | 17.10 (0.01) | 17.09 (0.01) | 17.07 (0.02) | 17.07 (0.02) | |||||
| G magnitude | 16.33 (0.003) | 16.36 (0.001) | 16.36 | 16.33 (0.003) | |||||
| BP magnitude | 16.24 (0.003) | 16.19 (0.006) | 16.19 | ||||||
| RP magnitude | 16.50 (0.004) | 16.49 (0.005) | 16.49 | ||||||
| Pan g magnitude | 16.21 (0.005) | 16.21 (0.005) | |||||||
| Pan r magnitude | 16.53 (0.007) | 16.53 (0.007) | |||||||
| Pan i magnitude | 16.83 (0.003) | 16.83 (0.003) | |||||||
| Pan z magnitude | 17.06 (0.006) | 17.05 (0.006) | |||||||
| Pan y magnitude | 17.23 (0.006) | 17.23 (0.006) | |||||||
| E(B-V) | 0.056 | ||||||||
* 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.