All names: SDSS J030859.87+380104.1, SDSSJ030859.88+380104.2, 2MASS J03085988+3801041, Gaia DR2 139566718927185408, Gaia EDR3 139565924356921472, Gaia DR3 139566718927185408
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 03 09 07.78 (0.4) | 03 08 59.88 | 03 08 59.88 (0.05) | ||
| Declination | 38 00 21.72 (0.4) | 38 01 04.20 | 38 01 04.20 (0.04) | ||
| Spectral type | sdOB | sdB0.2He11 | |||
| Effective temperature | [K] | 30842.0 (963) | |||
| log(g) | [cgs] | 5.68 (0.1) | |||
| Mass | [M☉] | ||||
| log(Luminosity) | [L☉] | ||||
| Cooling age | [Gyr] | ||||
| log(H/He) | |||||
| log(C/He) | |||||
| log(Ca/He) | |||||
| log(Ca/H) | |||||
| Parallax | [mas] | 5.89 (0.5) | 0.47 (0.1) | 0.46 (0.06) | |
| Distance | [pc] | 169.92 (13) | 2119.54 (546) | 2155.64 (258) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | -44.905 (0.5) | 4.287 (0.2) | 4.636 (0.06) | |
| Proper motion (declination) | [mas/yr] | -47.629 (0.5) | -5.006 (0.1) | -5.102 (0.06) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | |||||
| V magnitude | |||||
| R magnitude | |||||
| I magnitude | |||||
| J magnitude | 16.77 (0.1) | 16.77 (0.1) | |||
| H magnitude | 16.61 | ||||
| K magnitude | 15.56 | ||||
| u magnitude | 16.19 (0.006) | 16.19 (0.006) | |||
| g magnitude | 16.24 (0.004) | 16.24 (0.004) | |||
| r magnitude | 16.52 (0.005) | 16.52 (0.005) | |||
| i magnitude | 16.79 (0.005) | 16.79 (0.005) | |||
| z magnitude | 17.06 (0.01) | 17.06 (0.01) | |||
| G magnitude | 19.89 (0.005) | 16.41 (0.002) | 16.38 (0.003) | ||
| BP magnitude | 20.31 (0.08) | 16.30 (0.01) | |||
| RP magnitude | 19.40 (0.07) | 16.48 (0.009) | |||
| Pan g magnitude | 16.29 (0.002) | ||||
| Pan r magnitude | 16.55 (0.004) | ||||
| Pan i magnitude | 16.81 (0.004) | ||||
| Pan z magnitude | 17.03 (0.007) | ||||
| Pan y magnitude | 17.18 (0.008) | ||||
| E(B-V) | 0.138 | ||||
* 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.