All names: SDSS J004840.88-011547.4, GALEX J004840.8-011547, Gaia EDR3 2530654516748362112, Gaia DR3 2530654516748362112, PHL 844, USNO-B1.0 0887-00008242, SDSSJ004840.88-011547.4, Gaia DR2 2530654516748362112, SDSS J004840.88-011547.5
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Geier 2020 | Gaia DR2 | Stilism | Simbad | Eisenstein et al. 2006 |
|---|---|---|---|---|---|---|---|---|
| Right ascension | 00 48 40.89 (0.2) | 00 48 40.88 | 00 48 40.89 (0.2) | 00 48 40.88 (0.2) | 00 48 40.89 | |||
| Declination | -01 15 47.51 (0.09) | -01 15 47.40 | -01 15 47.51 (0.2) | -01 15 47.45 (0.09) | -01 15 47.43 | |||
| Spectral type | sdB | sdB | SDB: | |||||
| Effective temperature | [K] | 12233.0 (336) | ||||||
| log(g) | [cgs] | 8.72 (0.3) | ||||||
| Mass | [M☉] | |||||||
| log(Luminosity) | [L☉] | |||||||
| Cooling age | [Gyr] | |||||||
| log(H/He) | ||||||||
| log(C/He) | ||||||||
| log(Ca/He) | ||||||||
| log(Ca/H) | ||||||||
| Parallax | [mas] | 0.23 (0.2) | 0.10 (0.3) | 0.10 (0.3) | 0.23 (0.2) | |||
| Distance | [pc] | 4325.49 (3607) | 10460.25 (29904) | 10460.25 (29904) | 4325.26 (3607) | |||
| Composition | ||||||||
| Proper motion (right ascension) | [mas/yr] | 6.817692122 (0.3) | 6.813 (0.5) | 6.813 (0.5) | 6.818 (0.3) | |||
| Proper motion (declination) | [mas/yr] | -3.447620735 (0.2) | -3.398 (0.3) | -3.398 (0.3) | -3.448 (0.2) | |||
| Variability | ||||||||
| Magnetic | ||||||||
| Bd | [MG] | |||||||
| Infrared excess (disk) | ||||||||
| Binarity | ||||||||
| B magnitude | 18.10 | |||||||
| V magnitude | 18.80 | |||||||
| R magnitude | 18.80 | |||||||
| I magnitude | ||||||||
| J magnitude | ||||||||
| H magnitude | ||||||||
| K magnitude | ||||||||
| u magnitude | 18.31 (0.02) | 18.31 (0.02) | 18.31 (0.03) | |||||
| g magnitude | 18.33 (0.007) | 18.33 (0.007) | 18.39 (0.02) | |||||
| r magnitude | 18.53 (0.009) | 18.53 (0.009) | 18.55 (0.02) | |||||
| i magnitude | 18.62 (0.01) | 18.62 (0.01) | 18.66 (0.02) | |||||
| z magnitude | 18.68 (0.04) | 18.68 (0.04) | 18.78 (0.05) | |||||
| G magnitude | 18.39 (0.01) | 18.42 (0.002) | 18.42 | 18.39 (0.003) | ||||
| BP magnitude | 18.41 (0.01) | 18.38 (0.01) | 18.38 | |||||
| RP magnitude | 18.34 (0.02) | 18.30 (0.03) | 18.30 | |||||
| Pan g magnitude | 18.39 (0.009) | 18.39 (0.009) | ||||||
| Pan r magnitude | 18.53 (0.01) | 18.53 (0.01) | ||||||
| Pan i magnitude | 18.64 (0.006) | 18.64 (0.006) | ||||||
| Pan z magnitude | 18.74 (0.006) | 18.74 (0.006) | ||||||
| Pan y magnitude | 18.78 (0.02) | 18.78 (0.02) | ||||||
| E(B-V) | 0.025 | |||||||
* 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.