All names: PG 1638+147, PG1638+147, 2MASS J16403427+1438003, WISEA J164034.25+143800.6, UCAC2 37017542, SDSS J164034.27+143800.4, WISE J164034.26+143800.6, TIC 341358661, Gaia DR3 4462510121927168128, UCAC4 524-061173, Gaia DR2 4462510121927168128
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 16 40 34.24 | 16 40 34.27 (0.03) | ||
| Declination | 14 38 00.69 | 14 38 00.41 (0.02) | ||
| Spectral type | He-sdO | sdOC | ||
| Effective temperature | [K] | |||
| log(g) | [cgs] | |||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.58 (0.05) | 0.47 (0.04) | |
| Distance | [pc] | 1727.41 (159) | 2108.37 (179) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 2.711 (0.08) | 2.796 (0.03) | |
| Proper motion (declination) | [mas/yr] | -2.547 (0.06) | -2.352 (0.03) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 14.72 (0.01) | |||
| V magnitude | 14.89 (0.04) | |||
| R magnitude | 15.12 (0.1) | |||
| I magnitude | ||||
| J magnitude | 15.43 (0.05) | 15.43 (0.05) | ||
| H magnitude | 15.59 (0.1) | 15.59 (0.1) | ||
| K magnitude | 15.58 | |||
| u magnitude | 14.33 (0.004) | |||
| g magnitude | 14.69 (0.003) | 14.70 (0.06) | ||
| r magnitude | 15.22 (0.009) | 15.13 (0.04) | ||
| i magnitude | 15.47 (0.005) | 15.50 (0.01) | ||
| z magnitude | 15.68 (0.006) | |||
| G magnitude | 14.87 (0.0006) | 14.86 (0.003) | ||
| BP magnitude | 14.64 (0.009) | |||
| RP magnitude | 15.13 (0.002) | |||
| Pan g magnitude | 14.70 (0.003) | |||
| Pan r magnitude | 15.12 (0.003) | |||
| Pan i magnitude | 15.46 (0.003) | |||
| Pan z magnitude | 15.74 (0.003) | |||
| Pan y magnitude | 15.94 (0.004) | |||
| E(B-V) | 0.066 | |||
* 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.