SDSS J161801.33+445220.7

All names: SDSS J161801.34+445220.8, Gaia EDR3 1385558957951613952, SDSS J161801.33+445220.7, SDSS J161801.33+445220.8, J1618+4452, Gaia DR3 1385558957951613952, WD 1616+449, Gaia DR2 1385558957951613952

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Coutu et al. 2019 Gaia DR2 Stilism Dufour et al. 2007 Vincent et al. 2024 Simbad Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 16 18 01.31 (0.2) 16 18 01.33 16 18 01.34 16 18 01.31 (0.2) 16 18 01.31 16 18 01.34 (0.2) 16 18 01.34 16 18 00.72 16 18 01.34
Declination 44 52 21.06 (0.2) 44 52 20.85 44 52 20.74 44 52 21.05 (0.3) 44 52 21.06 44 52 20.76 (0.2) 44 52 20.77 44 52 15.60 44 52 20.81
Spectral type DZ DZ DZ DZ DZ DZ DZ DZ
Effective temperature [K] 9867.0 (261) 9560.0 (290) 11271.0 (697) 10857.0 (229) 10529.0 (207)
log(g) [cgs] 7.94 8.00 7.99 (0.1) 7.43 (0.3) 8.64 (0.7)
Mass [M] 0.544 0.576 (0.08)
log(Luminosity) [L]
Cooling age [Gyr] 0.5940
log(H/He) <-5.9193 <-5.0
log(C/He)
log(Ca/He) -7.6271 (0.2) -7.98 (0.1)
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] 3.96 (0.2) 3.76 3.76 (0.3) 3.96 3.96 (0.2)
Distance [pc] 252.54 (13) 266.01 (18) 266.01 (18) 226.00 252.54 252.54 (13)
Composition He He
Proper motion (right ascension) [mas/yr] -21.48257699 (0.2) -20.68186718 (0.5) -21.483 (0.2) -15.2
Proper motion (declination) [mas/yr] 18.97528985 (0.3) 19.91524927 (0.6) 18.975 (0.3) 19.4
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 19.42 (0.03) 19.42 (0.03) 19.38 (0.03) 19.38 19.40 (0.03)
g magnitude 19.12 (0.009) 19.12 (0.009) 19.12 (0.02) 19.12 19.12 (0.02)
r magnitude 19.25 (0.01) 19.25 (0.01) 19.26 (0.02) 19.26 19.26 (0.02)
i magnitude 19.44 (0.02) 19.44 (0.02) 19.44 (0.02) 19.44 19.46 (0.02)
z magnitude 19.73 (0.09) 19.73 (0.09) 19.68 (0.09) 19.68 19.70 (0.09)
G magnitude 19.18 (0.03) 19.22 19.18 19.18 (0.004)
BP magnitude 19.19 (0.03) 19.15
RP magnitude 19.10 (0.04) 19.06
Pan g magnitude 19.15 (0.01)
Pan r magnitude 19.28 (0.007)
Pan i magnitude 19.47 (0.01)
Pan z magnitude 19.66 (0.03)
Pan y magnitude 19.80 (0.04)
E(B-V) 0.016

* 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.