All names: EQ J2317+1830, WDJ231726.74+183052.75, Gaia DR3 2818957013992481280, SDSS J231726.72+183049.7, J2317+1830, SDSS J231726.72+183049.6, Gaia DR2 2818957013992481280, Gaia EDR3 2818957013992481280
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Kilic et al. 2025 | O'Brien et al. 2024 | Caron et al. 2023 | Bergeron et al. 2022 | McCleery et al. 2020 | Tremblay et al. 2020 | Gaia DR2 | Stilism | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 23 17 26.70 (0.2) | 23 17 26.70 (0.3) | 23 17 26.70 | 23 17 26.70 | 23 17 26.74 (0.2) | 23 17 26.70 | ||||||||
| Declination | 18 30 45.51 (0.2) | 18 30 45.74 (0.2) | 18 30 45.74 | 18 30 45.51 | 18 30 52.76 (0.2) | 18 30 45.74 | ||||||||
| Spectral type | DZ-IRfaint | DZ | DZ | DC | DZ | DZ | DA: | DZ | ||||||
| Effective temperature | [K] | 4557.0 (63) | 4676.0 (223) | 4557.0 (62) | 4557.0 (63) | 4601.6 (217) | 4600.0 (220) | 4771.0 (137) | ||||||
| log(g) | [cgs] | 8.78 (0.01) | 8.77 (0.1) | 8.79 (0.02) | 8.78 (0.1) | 8.78 (0.1) | 8.86 (0.05) | |||||||
| Mass | [M☉] | 1.076 (0.007) | 1.067 (0.08) | 1.077 (0.01) | 1.076 (0.007) | 1.125 (0.03) | ||||||||
| log(Luminosity) | [L☉] | |||||||||||||
| Cooling age | [Gyr] | 7.2100 | 6.3880 | |||||||||||
| log(H/He) | -0.01 | -0.01 | -0.01 | |||||||||||
| 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] | 26.41 (0.3) | 26.41 (0.3) | 26.45 (0.5) | 26.45 (0.5) | 26.45 (0.5) | 26.41 | 26.41 (0.3) | 26.45 (0.5) | |||||
| Distance | [pc] | 37.86 (0.4) | 37.86 (0.4) | 37.81 (0.7) | 37.81 (0.7) | 37.81 (0.7) | 37.86 | 37.86 (0.4) | 37.81 (0.7) | |||||
| Composition | He | He | ||||||||||||
| Proper motion (right ascension) | [mas/yr] | -33.85457019 (0.3) | -34.7749777 (1) | -33.855 (0.3) | -34.7749777 | |||||||||
| Proper motion (declination) | [mas/yr] | -452.8108488 (0.3) | -452.4890886 (0.5) | -452.811 (0.3) | -452.4890886 | |||||||||
| Variability | ||||||||||||||
| Magnetic | ||||||||||||||
| Bd | [MG] | |||||||||||||
| Infrared excess (disk) | ||||||||||||||
| Binarity | ||||||||||||||
| B magnitude | ||||||||||||||
| V magnitude | ||||||||||||||
| R magnitude | ||||||||||||||
| I magnitude | ||||||||||||||
| J magnitude | 18.13 (0.06) | |||||||||||||
| H magnitude | ||||||||||||||
| K magnitude | 18.42 (0.1) | |||||||||||||
| u magnitude | 21.79 (0.1) | 21.78 (0.1) | 21.78 (0.1) | |||||||||||
| g magnitude | 20.15 (0.02) | 20.15 (0.02) | ||||||||||||
| r magnitude | 19.34 (0.01) | 19.34 (0.01) | ||||||||||||
| i magnitude | 18.96 (0.01) | 18.96 (0.01) | ||||||||||||
| z magnitude | 18.74 (0.03) | 18.74 (0.03) | ||||||||||||
| G magnitude | 19.35 (0.06) | 19.38 | 19.38 | 19.35 | 19.35 (0.004) | 19.38 | ||||||||
| BP magnitude | 20.01 (0.06) | 19.95 | 19.95 | |||||||||||
| RP magnitude | 18.74 (0.03) | 18.68 | 18.68 | |||||||||||
| Pan g magnitude | 20.03 (0.02) | 20.03 (0.02) | ||||||||||||
| Pan r magnitude | 19.31 (0.008) | 19.31 (0.009) | ||||||||||||
| Pan i magnitude | 18.99 (0.009) | 18.99 (0.009) | ||||||||||||
| Pan z magnitude | 18.85 (0.009) | 18.85 (0.009) | ||||||||||||
| Pan y magnitude | 18.81 (0.02) | 18.81 (0.02) | ||||||||||||
| E(B-V) | 0.002 | |||||||||||||
* 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.