GJ 838.4

All names: Gaia EDR3 2693940725141960192, PM J21524+0223, USNO-B1.0 0923-00744672, TYC 548-105-1, CNS5 5402, LTT 18548, 2MASS J21522538+0223192, J2152+0223, WD 2149+021, HIP 107968, SDSS J215225.38+022316.9, SDSS J215225.38+022317.0, G 93-48, WD 2149+02, GALEX J215225.2+022319, TIC 405122007, UBV M 53715, LAMOST J215225.37+022319.6, 21524+0223, GEN# +9.80093048, [HMT98] AS 36-0, HIC 107968, UCAC2 32634338, NLTT 52306, PLX 5282.01, USNO 90, Gaia DR2 2693940725141960192, UBV 18730, JP11 5939, ASCC 1174905, G93-48, EGGR 150, FS 29, LSPM J2152+0223, G093-048, WISEA J215225.38+022316.4, CSI+02-21499, WDJ215225.38+022319.58, uvby98 980093048, GSC 00548-00105, GJ 838.4, Gaia DR3 2693940725141960192

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Kilic et al. 2025 O'Brien et al. 2024 Kilic et al. 2020 McCleery et al. 2020 MWDD H Gaia DR2 Bedard et al. 2017 Tremblay et al. 2017 Stilism Holberg et al. 2016 Guo et al. 2015 Limoges et al. 2015 Sion et al. 2014 Gianninas et al. 2011 Koester et al. 2009 Kilic et al. 2006 Koester et al. 2005 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 21 52 25.40 (0.04) 21 52 25.39 (0.06) 21 52 25.39 (0.06) 21 52 25.20 21 52 25.40 21 52 25.38 (0.04) 21 52 25.39 21 52 25.37
Declination 02 23 14.77 (0.03) 02 23 14.92 (0.06) 02 23 14.92 (0.06) 02 23 16.80 02 23 14.77 02 23 19.58 (0.03) 02 23 14.92 02 23 31.92
Spectral type DA DAZ DA DAZ DA DA DA DA DA DA DA2.8 DA DAZ DA DA DA2.8 DA3
Effective temperature [K] 17755.0 (72) 17508.0 (338) 17753.0 (72) 17876.2 (188) 11879.0 18202.0 (265) 18170.0 (270) 18170.0 (266) 18200.0 (265) 17353.0 18170.0 (266) 17926.0 (9) 17300.0 17300.0 17900.0 (173)
log(g) [cgs] 8.06 (0.003) 7.98 (0.02) 8.06 (0.004) 8.01 (0.01) 7.62 8.01 (0.04) 8.01 (0.04) 8.01 (0.04) 8.01 (0.04) 8.01 (0.04) 7.86 (0.002) 7.90 7.90 8.01 (0.008)
Mass [M☉] 0.655 (0.003) 0.608 (0.01) 0.657 (0.003) 0.414 0.71 (0.1) 0.63 (0.02) 0.63 (0.03) 0.62 (0.03) 0.625 (0.006)
log(Luminosity) [L☉] -1.78
Cooling age [Gyr] 0.2405 0.1100
log(H/He)
log(C/He)
log(Ca/He)
log(Ca/H) -7.6 -7.6
log(C/H)
log(N/H)
log(O/H)
log(Na/H)
log(Mg/H)
log(Al/H)
log(Si/H)
log(P/H)
log(S/H)
log(Sc/H)
log(Ti/H)
log(Cr/H)
log(Mn/H)
log(Fe/H)
log(Ni/H)
Parallax [mas] 44.33 (0.04) 44.33 (0.04) 44.43 (0.07) 44.43 (0.07) 37.51 (4) 40.80 (2) 40.80 (2) 44.33 44.33 (0.04) 44.43 (0.07) 39.00 (2)
Distance [pc] 22.56 (0.02) 22.56 (0.02) 22.51 (0.04) 22.51 (0.04) 24.40 (2) 26.66 (3) 24.51 (2) 24.50 (2) 24.50 23.00 22.56 22.56 (0.02) 22.51 (0.04) 25.64 (1)
Composition H H H H H H H H
Proper motion (right ascension) [mas/yr] 15.32342773 (0.04) 15.42679282 (0.1) 15.323 (0.04) 15.42679282
Proper motion (declination) [mas/yr] -300.5333442 (0.04) -300.5537833 (0.1) -300.533 (0.04) -300.5537833
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 12.73 (0.0004)
V magnitude 12.74 (0.01) 12.73 12.72 12.74 (0.0006)
R magnitude 12.84 (0.0006)
I magnitude 12.94 (0.002)
J magnitude 13.20 (0.02)
H magnitude 13.29 (0.04)
K magnitude 13.40 (0.04)
u magnitude 13.85 (0.005) 13.85 (0.005)
g magnitude 12.77 (0.001) 12.77 (0.001)
r magnitude 13.18 (0.002) 13.18 (0.002)
i magnitude 13.37 (0.002) 13.37 (0.002)
z magnitude 13.80 (0.005) 13.80 (0.005)
G magnitude 12.78 (0.001) 12.79 12.79 12.78 12.78 (0.003) 12.79
BP magnitude 12.71 (0.001) 12.69 12.69
RP magnitude 12.93 (0.001) 12.94 12.94
Pan g magnitude 12.86 (0.001)
Pan r magnitude 13.14 (0.001)
Pan i magnitude 13.25 (0.0006)
Pan z magnitude 13.51 (0.001)
Pan y magnitude 13.68 (0.002)
E(B-V) 0.000

* 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.