GJ 1234

All names: NLTT 47677, UCAC2 45369502, USNO 177, USNO-B1.0 1287-00331267, GEN# +9.80125003, WDJ191858.63+384321.48, G125-3, G 125-3, G 208-17, TIC 394178499, WD 1917+38, GJ 1234, 19189+3843, PSO J289.7444+38.7216, G125-003, UBV M 53763, Gaia DR3 2052891361294411520, SDSS J191858.65+384319.9, J1918+3843, LSPM J1918+3843, PM J19189+3843, CNS5 4788, EGGR 375, WD 1917+386, WISEA J191858.64+384318.8, 2MASS J19185863+3843214, 1SWASP J191858.65+384321.8, Gaia EDR3 2052891361294411520, Gaia DR2 2052891361294411520, PLX 4523.01

Parameter Unit Gaia EDR3 Pan-STARRS DR1 O'Brien et al. 2024 Caron et al. 2023 McCleery et al. 2020 Blouin et al. 2019 MWDD H MWDD HE Gaia DR2 Stilism Holberg et al. 2016 Limoges et al. 2015 Sion et al. 2014 Giammichele et al. 2012 Holberg et al. 2008 Bergeron et al. 2001 Bergeron et al. 1997 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 19 18 58.67 (0.01) 19 18 58.66 (0.02) 19 18 58.66 (0.02) 19 18 58.56 19 18 58.67 19 18 58.63 (0.01) 19 18 58.66 19 18 58.37
Declination 38 43 17.45 (0.02) 38 43 17.58 (0.02) 38 43 17.58 (0.02) 38 43 19.20 38 43 17.45 38 43 21.48 (0.02) 38 43 17.58 38 43 35.04
Spectral type DC DC DC DC DC DC DC DC DC7.9 DC DC DC DC DC7 DC7
Effective temperature [K] 6310.0 (33) 6070.0 (11) 6299.0 (12) 6140.0 (85) 6439.0 6187.0 6460.0 (143) 6410.0 (163) 6459.0 6459.0 (143) 6390.0 (140) 6470.0 (140) 5556.0 (31)
log(g) [cgs] 8.18 (0.01) 8.04 (0.003) 8.17 (0.005) 8.13 (0.03) 8.26 8.14 8.26 (0.05) 8.25 (0.06) 8.28 (0.05) 8.28 (0.05) 8.29 (0.06) 7.97 (0.006)
Mass [M] 0.683 (0.01) 0.597 (0.003) 0.651 (0.02) 0.757 0.658 0.76 (0.03) 0.73 (0.04) 0.75 (0.04) 0.75 (0.04) 0.76 (0.04) 0.553 (0.005)
log(Luminosity) [L] -3.77 -3.77 -3.79 (0.03) -3.77 (0.03)
Cooling age [Gyr] 2.6600 3.1230 (0.2) 3.3580 3.1010 3.2200 3.5500 3.6800 (0.3) 4.2600 (0.5)
log(H/He) -3.0
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] 84.24 (0.02) 84.24 (0.02) 84.21 (0.02) 84.21 (0.02) 84.21 (0.02) 84.21 (0.02) 85.50 (3) 85.50 (3) 85.50 (3) 85.50 (3) 85.50 (3) 85.50 (3) 84.24 84.24 (0.02) 84.21 (0.02) 84.00 (4)
Distance [pc] 11.87 (0.002) 11.87 (0.003) 11.88 (0.003) 11.87 (0.003) 11.88 (0.003) 11.87 (0.003) 11.70 (0.5) 11.70 (2) 11.69 11.70 (0.5) 11.70 11.70 (0.5) 11.70 (0.5) 11.87 11.87 (0.002) 11.87 (0.003) 11.90 (0.6)
Composition He He He He He He He He He
Proper motion (right ascension) [mas/yr] 25.20043737 (0.02) 25.11584133 (0.04) 25.2 (0.02) 25.11584133
Proper motion (declination) [mas/yr] -251.6767046 (0.02) -251.5967823 (0.04) -251.677 (0.02) -251.5967823
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 15.06 15.06 15.02 15.02
V magnitude 14.59 14.61 14.61 14.58
R magnitude 14.31 14.31 14.10
I magnitude 14.04 14.04 13.90
J magnitude 13.72 (0.003) 13.78 (0.03) 13.77 13.77 13.77 13.78 (0.03)
H magnitude 13.67 (0.03) 13.67 (0.03) 13.69 13.69 13.69 13.67 (0.03)
K magnitude 13.52 (0.03) 13.52 (0.03) 13.59 13.59 13.59 13.52 (0.03)
u magnitude 15.42 (0.004) 15.42 (0.004) 15.42 (0.004)
g magnitude 14.75 (0.003) 14.72 (0.003)
r magnitude 14.45 (0.003) 14.45 (0.003)
i magnitude 14.43 (0.002) 14.37 (0.003)
z magnitude 14.44 (0.003) 14.38 (0.004)
G magnitude 14.47 (0.0008) 14.48 14.48 14.47 14.47 (0.003) 14.48
BP magnitude 14.71 (0.0008) 14.71 14.71
RP magnitude 14.07 (0.0007) 14.08 14.08
Pan g magnitude 14.75 (0.003) 14.75 (0.003) 14.75 (0.003)
Pan r magnitude 14.50 (0.006) 14.50 (0.006) 14.50 (0.006)
Pan i magnitude 14.43 (0.002) 14.43 (0.002) 14.43 (0.002)
Pan z magnitude 14.44 (0.003) 14.44 (0.003) 14.44 (0.003)
Pan y magnitude 14.46 (0.003) 14.46 (0.003) 14.46 (0.003)
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.