All names: WD 1018+515, SDSS J102131.56+511622.9, SDSS J102131.56+511623.0, WIRED J102131.55+511623.0, [HHD2009] SDSS J1021+5116, GALEX J102131.6+511624, Gaia DR3 847993326400641408, Gaia DR2 847993326400641408, SDSS J102131.55+511622.9, SDSS J102131.55+511623.0, SDSS J102131.55+511623.4, Gaia EDR3 847993326400641408
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | Gaia DR2 | Stilism | sdss-wdms.org (29/04/2016) | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 10 21 31.55 (0.2) | 10 21 31.56 | 10 21 31.55 (0.3) | 10 21 31.55 | 10 21 31.56 (0.2) | 10 21 31.56 | 10 21 31.13 | 10 21 31.56 | ||||
| Declination | 51 16 22.84 (0.3) | 51 16 22.97 | 51 16 22.84 (0.4) | 51 16 23.02 | 51 16 22.97 (0.3) | 51 16 22.98 | 51 16 15.96 | 51 16 23.00 | ||||
| Spectral type | DB+M | DB+M | DB+M | DB+M | DB1.7+dM | DB+M | ||||||
| Effective temperature | [K] | 40847.0 (950) | 17622.0 (25) | 16258.0 (157) | 15874.0 (160) | |||||||
| log(g) | [cgs] | 7.98 (0.1) | 8.22 (0.02) | 8.04 (0.09) | 8.03 (0.1) | |||||||
| Mass | [M☉] | 0.62 (0.08) | ||||||||||
| log(Luminosity) | [L☉] | -0.35 (0.1) | ||||||||||
| Cooling age | [Gyr] | 0.0039 (0.0003) | ||||||||||
| log(H/He) | ||||||||||||
| log(C/He) | ||||||||||||
| log(Ca/He) | ||||||||||||
| log(Ca/H) | ||||||||||||
| log(N/He) | ||||||||||||
| log(O/He) | ||||||||||||
| log(Na/He) | ||||||||||||
| log(Mg/He) | ||||||||||||
| log(Al/He) | ||||||||||||
| log(Si/He) | ||||||||||||
| log(P/He) | ||||||||||||
| log(S/He) | ||||||||||||
| log(Cl/He) | ||||||||||||
| log(Sc/He) | ||||||||||||
| log(Ti/He) | ||||||||||||
| log(V/He) | ||||||||||||
| log(Cr/He) | ||||||||||||
| log(Mn/He) | ||||||||||||
| log(Fe/He) | ||||||||||||
| log(Co/He) | ||||||||||||
| log(Ni/He) | ||||||||||||
| log(Cu/He) | ||||||||||||
| log(Zn/He) | ||||||||||||
| log(Ga/He) | ||||||||||||
| log(Ge/He) | ||||||||||||
| log(Sr/He) | ||||||||||||
| Parallax | [mas] | 1.52 (0.4) | 0.67 (0.5) | 1.52 (0.4) | ||||||||
| Distance | [pc] | 656.15 (160) | 1501.42 (1019) | 2011.00 (893) | 656.17 (160) | |||||||
| Composition | He | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -1.854586099 (0.3) | -3.315912189 (0.6) | -1.855 (0.3) | -1.0 | |||||||
| Proper motion (declination) | [mas/yr] | -8.412918321 (0.4) | -8.656241471 (0.9) | -8.413 (0.4) | -13.4 | |||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | WDMS | WDMS | WDMS | |||||||||
| B magnitude | 17.89 | |||||||||||
| V magnitude | 18.47 | |||||||||||
| R magnitude | ||||||||||||
| I magnitude | ||||||||||||
| J magnitude | ||||||||||||
| H magnitude | ||||||||||||
| K magnitude | ||||||||||||
| u magnitude | 18.03 (0.01) | 18.01 | 18.03 (0.01) | 18.01 (0.02) | 18.02 | 18.01 (0.02) | ||||||
| g magnitude | 18.27 (0.007) | 18.28 | 18.27 (0.007) | 18.28 (0.02) | 18.27 | 18.28 (0.02) | ||||||
| r magnitude | 18.64 (0.009) | 18.64 | 18.64 (0.009) | 18.64 (0.02) | 18.64 | 18.64 (0.02) | ||||||
| i magnitude | 18.49 (0.01) | 18.52 | 18.49 (0.01) | 18.52 (0.02) | 18.50 | 18.50 (0.02) | ||||||
| z magnitude | 18.13 (0.03) | 18.14 | 18.13 (0.03) | 18.14 (0.03) | 18.15 | 18.12 (0.03) | ||||||
| G magnitude | 18.41 (0.01) | 18.38 | 18.41 (0.005) | |||||||||
| BP magnitude | 18.36 (0.01) | 18.29 | ||||||||||
| RP magnitude | 18.07 (0.01) | 18.08 | ||||||||||
| Pan g magnitude | 18.36 (0.01) | |||||||||||
| Pan r magnitude | 18.63 (0.009) | |||||||||||
| Pan i magnitude | 18.49 (0.004) | |||||||||||
| Pan z magnitude | 18.24 (0.006) | |||||||||||
| Pan y magnitude | 18.03 (0.02) | |||||||||||
| E(B-V) | 0.020 | |||||||||||
* 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.