All names: UCAC4 575-055091, SDSS J164858.78+245801.78, GALEX J164858.8+245802, PG1646+250, Gaia EDR3 1300121926607765760, Gaia DR2 1300121926607765760, TIC 258196166, SDSS J164858.77+245801.8, Gaia DR3 1300121926607765760, 2MASS J16485874+2458020, SDSS J164858.78+245801.7, HIDDEN NAME PG 1646+250, PG 1646+251, Ton 263, LAMOST J164858.77+245801.8
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | SDSS DR10 | Geier 2020 | Gaia DR2 | Stilism | Kepler et al. 2015 | Simbad | Eisenstein et al. 2006 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 16 48 58.78 (0.02) | 16 48 58.77 | 16 48 58.77 | 16 48 58.72 | 16 48 58.78 (0.04) | 16 48 58.77 (0.02) | 16 48 58.78 | ||||
| Declination | 24 58 01.70 (0.03) | 24 58 01.85 | 24 58 01.85 | 24 58 02.52 | 24 58 01.70 (0.04) | 24 58 01.86 (0.03) | 24 58 01.88 | ||||
| Spectral type | sdB | DAZ | sdB | SD_auto | |||||||
| Effective temperature | [K] | 22001.0 (1143) | 25886.0 (199) | 26624.0 (141) | |||||||
| log(g) | [cgs] | 5.58 (0.2) | 5.68 (0.03) | 5.77 (0.02) | |||||||
| Mass | [M☉] | ||||||||||
| log(Luminosity) | [L☉] | ||||||||||
| Cooling age | [Gyr] | ||||||||||
| log(H/He) | |||||||||||
| log(C/He) | |||||||||||
| log(Ca/He) | |||||||||||
| log(Ca/H) | |||||||||||
| Parallax | [mas] | 0.90 (0.04) | 0.87 (0.06) | 0.87 (0.06) | 0.90 (0.04) | ||||||
| Distance | [pc] | 1114.58 (47) | 1152.34 (79) | 1152.38 (79) | 1114.58 (47) | ||||||
| Composition | |||||||||||
| Proper motion (right ascension) | [mas/yr] | 7.773387199 (0.03) | 7.794 (0.09) | 7.794043449 (0.09) | 7.773 (0.03) | 13.0 | |||||
| Proper motion (declination) | [mas/yr] | -10.1285092 (0.04) | -10.12 (0.1) | -10.12036714 (0.1) | -10.129 (0.04) | -9.5 | |||||
| Variability | |||||||||||
| Magnetic | |||||||||||
| Bd | [MG] | ||||||||||
| Infrared excess (disk) | |||||||||||
| Binarity | |||||||||||
| B magnitude | 15.89 (0.04) | ||||||||||
| V magnitude | 16.06 (0.01) | ||||||||||
| R magnitude | |||||||||||
| I magnitude | |||||||||||
| J magnitude | 16.30 (0.1) | 16.30 (0.1) | |||||||||
| H magnitude | 16.16 (0.2) | 16.16 (0.2) | |||||||||
| K magnitude | 17.02 | ||||||||||
| u magnitude | 16.00 (0.005) | 16.00 (0.005) | 16.00 (0.005) | 16.00 (0.02) | 16.00 (0.005) | 16.04 (0.01) | |||||
| g magnitude | 15.85 (0.003) | 15.85 (0.003) | 15.85 (0.003) | 15.87 (0.02) | 15.85 (0.003) | 15.88 (0.01) | |||||
| r magnitude | 16.21 (0.004) | 16.21 (0.004) | 16.20 (0.004) | 16.21 (0.01) | 16.20 (0.004) | 16.22 (0.01) | |||||
| i magnitude | 16.46 (0.005) | 16.46 (0.005) | 16.46 (0.005) | 16.46 (0.01) | 16.46 (0.005) | 16.46 (0.01) | |||||
| z magnitude | 16.70 (0.01) | 16.70 (0.01) | 16.70 (0.01) | 16.70 (0.02) | 16.70 (0.01) | 16.72 (0.02) | |||||
| G magnitude | 16.05 (0.002) | 16.07 (0.001) | 16.07 | 16.05 (0.003) | |||||||
| BP magnitude | 15.99 (0.002) | 15.96 (0.005) | 15.95 | ||||||||
| RP magnitude | 16.16 (0.003) | 16.16 (0.003) | 16.16 | ||||||||
| Pan g magnitude | 15.93 (0.003) | 15.93 (0.003) | |||||||||
| Pan r magnitude | 16.21 (0.003) | 16.21 (0.003) | |||||||||
| Pan i magnitude | 16.49 (0.002) | 16.49 (0.002) | |||||||||
| Pan z magnitude | 16.71 (0.006) | 16.71 (0.006) | |||||||||
| Pan y magnitude | 16.85 (0.006) | 16.85 (0.006) | |||||||||
| E(B-V) | 0.032 | ||||||||||
* 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.