GJ 1221

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

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.