LP 70-238

All names: PM J16540+6253, 16540+6253, SDSS J165401.24+625354.9, SDSS J165401.30+625355.0, Gaia EDR3 1631578537252535040, SDSS J165401.26+625355.0, LSPM J1654+6253, SDSS J165401.23+625354.9, SDSS J165400.76+625355.8, LP 70-238, SDSS J165400.75+625355.8, NLTT 43831, LHS 3250, Gaia DR2 1631578537252535040, J1653+6253, Gaia DR3 1631578537252535040, WD 1653+630, WDJ165401.26+625354.91

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 MWDD H MWDD HE Gaia DR2 Stilism Limoges et al. 2015 Harris et al. 2003 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999) Vincent et al. 2023
Right ascension 16 53 59.98 (0.09) 16 54 00.02 (0.1) 16 54 00.02 (0.1) 16 53 59.98 16 54 01.26 (0.09) 16 54 00.02 16 54 10.30
Declination 62 53 57.31 (0.1) 62 53 57.23 (0.2) 62 53 57.23 (0.2) 62 53 57.31 62 53 54.90 (0.1) 62 53 57.23 62 55 15.24
Spectral type DC-IRfaint DC DC DC DC DC DC DC DC+cia DC DC9 DC DC9 DC
Effective temperature [K] 4993.0 (33) 5036.0 (30) 4993.0 (33) 9566.0 8848.0 3080.0 (95) 6676.0 (479)
log(g) [cgs] 8.74 (0.003) 8.75 (0.005) 9.75 9.61 7.24 (0.03) 9.33 (0.04)
Mass [M] 1.049 (0.002) 1.058 (0.003) 1.049 (0.002) 1.497 1.4 0.22 (0.01) 1.303 (0.01)
log(Luminosity) [L] -4.55
Cooling age [Gyr] 7.0200 6.3500 2.0930 1.6030
log(H/He) -2.74 -2.78 -2.74
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] 32.49 (0.1) 32.49 (0.1) 32.49 (0.1) 32.49 (0.1) 32.49 (0.1) 33.00 (0.5) 32.49 32.49 (0.1) 32.49 (0.1) 33.00 (0.5)
Distance [pc] 30.78 (0.09) 30.78 (0.09) 30.78 (0.1) 30.78 (0.1) 30.78 (0.1) 30.30 (0.5) 30.78 30.78 (0.09) 30.78 (0.1) 30.30 (0.5)
Composition He He+CIA He
Proper motion (right ascension) [mas/yr] -545.7895558 (0.1) -546.1470874 (0.3) -545.79 (0.1) -546.147
Proper motion (declination) [mas/yr] 150.3998808 (0.1) 149.9665722 (0.3) 150.4 (0.1) 149.967
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 17.70
V magnitude
R magnitude
I magnitude
J magnitude 18.33 (0.05)
H magnitude 18.94 (0.06)
K magnitude 19.19 (0.1)
u magnitude 19.65 (0.03) 19.70 19.66 (0.03) 19.66 (0.03) 19.69
g magnitude 18.40 18.40 (0.007) 18.40 (0.007) 18.40
r magnitude 17.87 17.86 (0.006) 17.86 (0.006) 17.87
i magnitude 18.07 18.05 (0.008) 18.05 (0.008) 18.06
z magnitude 18.35 18.63 (0.04) 18.63 (0.04) 18.54
G magnitude 18.06 (0.01) 18.09 18.09 18.06 18.06 (0.003) 18.09
BP magnitude 18.27 (0.01) 18.31 18.31
RP magnitude 17.82 (0.02) 17.77 17.77
Pan g magnitude 18.36 (0.02) 18.36 (0.02)
Pan r magnitude 17.87 (0.009) 17.87 (0.009)
Pan i magnitude 18.16 (0.02) 18.16 (0.02)
Pan z magnitude 18.54 (0.02) 18.54 (0.02)
Pan y magnitude 18.87 (0.04) 18.87 (0.04)
E(B-V) 0.003

* 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.