GJ 1221

All names: WD 1748+70, LHS 455, Gaia DR3 1638979384378696704, WDJ174807.99+705235.92, USNO 346, WISEA J174805.31+705247.5, GJ 1221, G 240-72, WD 1748+708, TIC 233212451, NLTT 45565, LSPM J1748+7052, Gaia DR2 1638979384378696704, 17481+7052, G240-72, Zkh 268, EGGR 372, LP 44-113, GEN# +9.80240072, WISE J174805.39+705247.3, J1748+7052, 8pc 164.70, Gaia EDR3 1638979384378696704, 2MASS J17480817+7052353, USNO-B1.0 1608-00117171, PLX 4085.11, PM J17481+7052, CNS5 4408

Parameter Unit Gaia EDR3 Pan-STARRS DR1 O'Brien et al. 2024 Caron et al. 2023 McCleery et al. 2020 Gaia DR2 Stilism Holberg et al. 2016 Ferrario et al. 2015 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 17 48 03.87 (0.01) 17 48 04.00 (0.01) 17 48 04.00 (0.01) 17 48 07.92 17 48 03.87 17 48 07.99 (0.01) 17 48 04.00 17 48 19.42
Declination 70 52 53.67 (0.01) 70 52 53.11 (0.02) 70 52 53.11 (0.02) 70 52 33.60 70 52 53.67 70 52 35.92 (0.01) 70 52 53.11 70 51 52.56
Spectral type DXP DXP DXP DQ DB DXP DQ9.0 DXP DQP DC DC DQ9P DXP9
Effective temperature [K] 5137.0 (19) 5058.0 (5) 5177.3 (8) 5570.0 (107) 5590.0 (90) 5260.0 (64) 5570.0 5570.0 (107) 5590.0 (90) 5640.0 (100) 5667.0 (11)
log(g) [cgs] 8.06 (0.01) 8.03 (0.003) 8.09 (0.005) 8.34 (0.02) 8.20 (0.02) 8.34 (0.02) 8.36 (0.02) 8.39 (0.02) 8.35 (0.003)
Mass [M] 0.606 (0.008) 0.586 (0.002) 0.81 (0.01) 0.81 (0.01) 0.7 (0.01) 0.79 (0.01) 0.81 (0.01) 0.82 (0.01) 0.811 (0.003)
log(Luminosity) [L] -4.08 -4.07 -4.07 (0.02) -4.07 (0.01)
Cooling age [Gyr] 5.8900 5.6000 5.8600 5.8600 (0.06) 6.7200 (0.06)
log(H/He)
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] 161.00 (0.01) 161.00 (0.01) 160.98 (0.01) 160.98 (0.01) 160.98 (0.01) 164.70 (2) 164.70 (2) 164.70 (2) 164.70 (2) 164.70 (2) 164.70 (2) 161.00 161.00 (0.01) 160.98 (0.01) 172.00
Distance [pc] 6.21 (0.0005) 6.21 (0.0004) 6.21 (0.0004) 6.21 (0.0006) 6.21 (0.0006) 6.07 (0.09) 6.10 (2) 6.07 6.07 (0.09) 6.07 6.07 (0.09) 6.07 (0.09) 6.21 6.21 (0.0005) 6.21 (0.0006) 5.81
Composition He He He He He He He He
Proper motion (right ascension) [mas/yr] -1266.387171 (0.02) -1266.422964 (0.03) -1266.387 (0.02) -1266.422964
Proper motion (declination) [mas/yr] 1108.80071 (0.02) 1108.867598 (0.03) 1108.801 (0.02) 1108.867598
Variability
Magnetic yes yes yes yes
Bd [MG] >100
Infrared excess (disk)
Binarity
B magnitude 14.61 14.61 14.56
V magnitude 14.15 14.13 14.13 14.15
R magnitude 13.60 13.60 13.50
I magnitude 13.08 13.08 13.06
J magnitude 12.71 (0.02) 12.77 12.77 12.77 12.71 (0.02)
H magnitude 12.53 (0.02) 12.70 12.70 12.70 12.53 (0.02)
K magnitude 12.51 (0.02) 12.50 12.50 12.50 12.51 (0.02)
u magnitude
g magnitude
r magnitude
i magnitude
z magnitude
G magnitude 13.78 (0.001) 13.79 13.79 13.78 13.78 (0.003) 13.79
BP magnitude 14.18 (0.001) 14.18 14.18
RP magnitude 13.18 (0.0005) 13.19 13.19
Pan g magnitude 14.30 (0.005) 14.29 (0.002)
Pan r magnitude 13.80 (0.0005) 13.81 (0.001)
Pan i magnitude 13.53 (0.002) 13.52 (0.001)
Pan z magnitude 13.45 (0.004) 13.43 (0.002)
Pan y magnitude 13.45 (0.003) 13.46 (0.001)
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.