All names: WD 1227+394, [HHD2009] SDSS J1230+3908, Gaia DR2 1532057921595867904, SDSS J123022.53+390843.8, GALEX J123022.5+390844, Gaia DR3 1532057921595867904, Gaia EDR3 1532057921595867904, SDSS J123022.53+390843.80
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | SDSS DR10 | Gaia DR2 | Stilism | sdss-wdms.org (29/04/2016) | Kepler et al. 2015 | Simbad | White Dwarf Catalog (McCook & Sion 1999) | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 12 30 22.48 (0.2) | 12 30 22.53 | 12 30 22.53 | 12 30 22.49 (0.3) | 12 30 22.53 | 12 30 22.55 (0.2) | 12 30 21.82 | |||||
| Declination | 39 08 43.39 (0.2) | 39 08 43.81 | 39 08 43.81 | 39 08 43.40 (0.3) | 39 08 43.80 | 39 08 43.84 (0.2) | 39 08 38.04 | |||||
| Spectral type | DA+M | DA+M7_known | DA+M | DA5.6 | DA+MS | |||||||
| Effective temperature | [K] | 8773.0 (233) | 8766.0 (137) | |||||||||
| log(g) | [cgs] | 7.83 (0.5) | 7.69 (0.2) | |||||||||
| Mass | [M☉] | 0.5 (0.3) | 0.46 (0.1) | |||||||||
| log(Luminosity) | [L☉] | |||||||||||
| Cooling age | [Gyr] | |||||||||||
| log(H/He) | ||||||||||||
| log(C/He) | ||||||||||||
| log(Ca/He) | ||||||||||||
| log(Ca/H) | ||||||||||||
| Parallax | [mas] | 2.47 (0.3) | 2.33 (0.4) | 2.47 (0.3) | ||||||||
| Distance | [pc] | 404.52 (47) | 429.72 (74) | 262.00 (32) | 404.51 (47) | |||||||
| Composition | ||||||||||||
| Proper motion (right ascension) | [mas/yr] | -46.42471072 (0.2) | -46.28444739 (0.7) | -46.425 (0.2) | ||||||||
| Proper motion (declination) | [mas/yr] | -28.2432939 (0.3) | -28.03241583 (0.4) | -28.243 (0.3) | ||||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | WDMS | yes | WDMS | |||||||||
| B magnitude | ||||||||||||
| V magnitude | ||||||||||||
| R magnitude | ||||||||||||
| I magnitude | ||||||||||||
| J magnitude | ||||||||||||
| H magnitude | ||||||||||||
| K magnitude | ||||||||||||
| u magnitude | 20.11 (0.05) | 20.11 (0.05) | 20.14 | 20.10 (0.04) | 20.12 (0.05) | 20.14 | ||||||
| g magnitude | 19.57 (0.01) | 19.57 (0.01) | 19.53 | 19.57 (0.03) | 19.54 (0.01) | 19.53 | ||||||
| r magnitude | 19.56 (0.02) | 19.56 (0.02) | 19.55 | 19.56 (0.03) | 19.56 (0.02) | 19.55 | ||||||
| i magnitude | 19.33 (0.02) | 19.33 (0.02) | 19.34 | 19.34 (0.02) | 19.34 (0.02) | 19.34 | ||||||
| z magnitude | 18.90 (0.04) | 18.90 (0.04) | 18.90 | 18.89 (0.04) | 18.92 (0.04) | 18.90 | ||||||
| G magnitude | 19.39 (0.06) | 19.42 | 19.39 (0.004) | |||||||||
| BP magnitude | 19.60 (0.06) | 19.60 | ||||||||||
| RP magnitude | 18.95 (0.04) | 18.85 | ||||||||||
| Pan g magnitude | 19.57 (0.006) | |||||||||||
| Pan r magnitude | 19.55 (0.02) | |||||||||||
| Pan i magnitude | 19.37 (0.02) | |||||||||||
| Pan z magnitude | 19.02 (0.02) | |||||||||||
| Pan y magnitude | 18.77 (0.02) | |||||||||||
| E(B-V) | 0.016 | |||||||||||
* 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.