GD 524

All names: SDSS J172856.22+555822.7, WDJ172856.22+555822.63, Gaia DR2 1422012892308493568, Gaia DR3 1422012892308493568, GD 524, UCAC4 730-055771, USNO-B1.0 1459-00267146, G 227-5, 2MASS J17285622+5558222, J1728+5558, WIRED J172856.22+555822.7, NLTT 44918, EGGR 441, PG 1727+560, SDSS J172856.21+555822.6, TIC 198479927, WD 1727+560, SDSS J172856.20+555823.1, Gaia EDR3 1422012892308493568, SDSS J172856.22+555822.8, LSPM J1728+5558, 1727+560, G227-5, SDSS J172856.23+555822.8, SDSS J172856.19+555823.0

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Kilic et al. 2025 Jewett et al. 2024 Coutu et al. 2019 Leggett et al. 2018 Gaia DR2 Stilism Liebert et al. 2003 Harris et al. 2003 Wegner and Koester 1985 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 17 28 56.02 (0.03) 17 28 56.20 17 28 56.22 17 28 56.03 (0.05) 17 28 56.02 17 28 56.22 (0.03) 17 28 56.03 17 28 56.22 17 28 53.74 17 28 56.22
Declination 55 58 26.30 (0.04) 55 58 23.07 55 58 22.63 55 58 26.18 (0.06) 55 58 26.30 55 58 22.63 (0.04) 55 58 26.18 55 58 22.68 55 57 54.36 55 58 22.77
Spectral type DQA DQA DQA DQAB3.6 DBQA DQAB CI DBQA4 DQ DBQ4 hotDQ DQABhot DB3 DQ_CI hotDQ
Effective temperature [K] 14331.0 (170) 14331.0 (170) 14453.0 (683) 13825.0 (320) 17000.0 12500.0 (500) 14253.0 (198) 100000.0 (794) 78750.0 (1846)
log(g) [cgs] 8.90 (0.01) 8.90 8.90 8.84 (0.03) 8.88 (0.01) 9.00 (0.002) 10.00 (0.002)
Mass [M] 1.139 (0.006) 1.139 (0.006) 1.14 1.112 (0.02) 1.131 (0.009)
log(Luminosity) [L]
Cooling age [Gyr] 1.1500 (0.04) 1.0800 1.1170 (0.08)
log(H/He) -1.66 -1.66 -3
log(C/He) 0.0 -1.3746 (0.07) -2.5 (-3)
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] 21.24 (0.04) 21.19 20.71 (0.4) 21.19 (0.06) 21.24 21.24 (0.04) 21.19 (0.06)
Distance [pc] 47.08 (0.08) 47.20 (0.1) 48.29 (1) 47.20 (0.1) 47.08 47.08 (0.08) 47.20 (0.1)
Composition He He
Proper motion (right ascension) [mas/yr] -105.4039169 (0.04) -105.2494485 (0.1) -105.404 (0.04) -105.249 -106.2
Proper motion (declination) [mas/yr] 229.0197167 (0.05) 229.1349977 (0.1) 229.02 (0.06) 229.135 225.1
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 16.19 (0.05)
V magnitude
R magnitude 15.89 (0.4)
I magnitude
J magnitude 16.53 (0.1)
H magnitude
K magnitude
u magnitude 15.84 (0.005) 15.84 15.84 (0.005) 15.84 (0.005) 15.89 (0.03) 15.84 15.87 (0.02)
g magnitude 15.98 (0.003) 15.98 15.98 (0.003) 15.98 (0.003) 15.99 (0.02) 15.98 16.00 (0.02)
r magnitude 16.31 (0.004) 16.32 16.31 (0.004) 16.31 (0.004) 16.32 (0.01) 16.32 16.33 (0.01)
i magnitude 16.57 (0.005) 16.56 16.57 (0.005) 16.57 (0.005) 16.57 (0.01) 16.57 16.58 (0.01)
z magnitude 16.84 (0.01) 16.82 16.84 (0.01) 16.84 (0.01) 16.82 (0.02) 16.83 16.84 (0.02)
G magnitude 16.14 (0.003) 16.17 16.14 16.14 (0.003) 16.17
BP magnitude 16.07 (0.003) 16.02 16.02
RP magnitude 16.27 (0.004) 16.27 16.27
Pan g magnitude 16.05 (0.006)
Pan r magnitude 16.31 (0.003)
Pan i magnitude 16.60 (0.004)
Pan z magnitude 16.82 (0.008)
Pan y magnitude 16.99 (0.008)
E(B-V) 0.006

* Constant surface field

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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.