All names: SBSS 1555+504, SDSS J155642.94+501537.4, SDSS J155642.94+501537.5, Gaia EDR3 1403149533383468928, SDSS J155642.95+501537.5, PG 1555+504, Gaia DR3 1403149533383468928, PG1555+504, GALEX J155642.8+501537, Gaia DR2 1403149533383468928, LAMOST J155642.94+501537.5
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Geier 2020 | Gaia DR2 | Stilism | Simbad | Eisenstein et al. 2006 | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 15 56 42.93 (0.04) | 15 56 42.94 | 15 56 42.94 | 15 56 42.93 (0.05) | 15 56 42.95 (0.04) | 15 56 42.94 | 15 56 42.95 | |||
| Declination | 50 15 37.53 (0.04) | 50 15 37.46 | 50 15 36.79 | 50 15 37.53 (0.06) | 50 15 37.47 (0.04) | 50 15 37.51 | 50 15 37.49 | |||
| Spectral type | He-sdO | sdOC | SDO | DO | ||||||
| Effective temperature | [K] | 71231.0 (7000) | 100000.0 (397) | 100000.0 (794) | ||||||
| log(g) | [cgs] | 5.84 (0.2) | 5.68 (0.07) | 5.86 (0.1) | ||||||
| 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) | 0.19 (0.06) | 0.19 (0.06) | 0.34 (0.04) | |||||
| Distance | [pc] | 2927.87 (362) | 5194.81 (1616) | 5194.93 (1616) | 2928.26 (362) | |||||
| Composition | ||||||||||
| Proper motion (right ascension) | [mas/yr] | -8.366829643 (0.05) | -8.411 (0.1) | -8.410822188 (0.1) | -8.367 (0.05) | -2.5 | ||||
| Proper motion (declination) | [mas/yr] | 3.73077389 (0.05) | 3.858 (0.1) | 3.8580049 (0.1) | 3.731 (0.05) | -2.7 | ||||
| Variability | ||||||||||
| Magnetic | ||||||||||
| Bd | [MG] | |||||||||
| Infrared excess (disk) | ||||||||||
| Binarity | ||||||||||
| B magnitude | 16.00 | |||||||||
| V magnitude | ||||||||||
| R magnitude | ||||||||||
| I magnitude | ||||||||||
| J magnitude | ||||||||||
| H magnitude | ||||||||||
| K magnitude | ||||||||||
| u magnitude | 15.38 (0.004) | 15.38 (0.004) | 15.38 (0.004) | 15.44 (0.02) | 15.40 (0.02) | |||||
| g magnitude | 15.81 (0.003) | 15.81 (0.003) | 15.81 (0.003) | 15.86 (0.01) | 15.84 (0.01) | |||||
| r magnitude | 16.38 (0.004) | 16.38 (0.004) | 16.38 (0.004) | 16.38 (0.01) | 16.38 (0.01) | |||||
| i magnitude | 16.74 (0.005) | 16.73 (0.005) | 16.73 (0.005) | 16.73 (0.01) | 16.73 (0.01) | |||||
| z magnitude | 17.07 (0.01) | 17.07 (0.01) | 17.07 (0.01) | 17.09 (0.02) | 17.07 (0.02) | |||||
| G magnitude | 16.11 (0.003) | 16.13 (0.002) | 16.13 | 16.11 (0.003) | ||||||
| BP magnitude | 15.93 (0.003) | 15.85 (0.01) | 15.85 | |||||||
| RP magnitude | 16.45 (0.005) | 16.44 (0.005) | 16.44 | |||||||
| Pan g magnitude | 15.93 (0.005) | 15.93 (0.005) | ||||||||
| Pan r magnitude | 16.39 (0.003) | 16.39 (0.003) | ||||||||
| Pan i magnitude | 16.76 (0.002) | 16.76 (0.002) | ||||||||
| Pan z magnitude | 17.05 (0.004) | 17.05 (0.004) | ||||||||
| Pan y magnitude | 17.26 (0.009) | 17.26 (0.009) | ||||||||
| 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.