GJ 820.1

All names: L24-52, NLTT 50581, uvby98 600108381, Gaia EDR3 6348672845649310464, CSI-82-21052, Gaia DR2 6348672845649310464, LAWD 83, BPM 1266, LTT 8381, CNS5 5235, Gaia DR3 6348672845649310464, EGGR 142, PLX 5055.01, WG 37, GSC 09473-00173, JL 73, L 24-052, TIC 403995834, WD 2105-82, WDJ211316.85-814912.88, L 24-52, 2MASS J21131688-8149129, UBV 18198, WD 2105-820, USNO-B1.0 0081-00097878, GCRV 27472, WISEA J211318.14-814916.9, EC 21053-8201, GJ 820.1, GEN# +9.86024052

Parameter Unit Gaia EDR3 O'Brien et al. 2024 Hardy et al. 2023a Gaia DR2 Bedard et al. 2017 Subasavage et al. 2017 Stilism Holberg et al. 2016 Ferrario et al. 2015 Sion et al. 2014 Giammichele et al. 2012 Gianninas et al. 2011 Koester et al. 2009 Holberg et al. 2008 Koester et al. 2005 Bergeron et al. 2001 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 21 13 18.84 (0.01) 21 13 18.77 (0.03) 21 13 16.81 21 13 16.80 21 13 18.84 21 13 16.85 (0.01) 21 13 18.77 21 13 04.94
Declination -81 49 18.96 (0.01) -81 49 18.77 (0.03) -81 49 01.08 -81 49 12.00 -81 49 18.96 -81 49 12.88 (0.01) -81 49 18.77 -81 48 43.20
Spectral type DAZH DA DA DAZH DAP DAZ DA4.7 DAZH DA DAP DA DA DA DA4.8 DA6
Effective temperature [K] 9914.0 (84) 10298.8 (110) 9797.0 (141) 9820.0 (240) 10034.0 (306) 10800.0 (290) 10620.0 10218.0 (306) 10600.0 (153) 10300.0 10200.0 (290) 9513.0 (32)
log(g) [cgs] 8.24 (0.02) 8.34 (0.08) 8.27 (0.05) 8.29 (0.04) 7.98 (0.2) 8.23 (0.2) 8.24 (0.05) 8.00 8.23 (0.2) 8.17 (0.005)
Mass [M] 0.751 (0.01) 0.8123301868315818 (0.1) 0.78 (0.1) 0.78 (0.03) 0.59 (0.1) 0.75 (0.03) 0.74 (0.1) 0.75 (0.03) 0.75 (0.1) 0.703 (0.005)
log(Luminosity) [L] -3.04 (0.05) -2.93 -2.93 (0.1)
Cooling age [Gyr] 0.9800 (0.09) 0.5900 0.8000 0.8100 (0.3)
log(H/He)
log(C/He)
log(Ca/He)
log(Ca/H) -8.6
log(C/H)
log(N/H)
log(O/H)
log(Na/H)
log(Mg/H)
log(Al/H)
log(Si/H)
log(P/H)
log(S/H)
log(Sc/H)
log(Ti/H)
log(Cr/H)
log(Mn/H)
log(Fe/H)
log(Ni/H)
Parallax [mas] 61.81 (0.02) 61.81 (0.02) 61.86 (0.03) 64.81 (1) 58.60 (9) 58.60 (9) 58.60 (9) 58.60 (9) 61.81 61.81 (0.02) 61.86 (0.03) 55.10 (37)
Distance [pc] 16.18 (0.004) 16.18 (0.005) 16.16 (0.008) 15.40 (0.3) 15.43 (0.3) 17.06 (3) 17.06 17.10 (3) 18.00 18.12 17.06 (3) 16.18 16.18 (0.004) 16.16 (0.008) 18.15 (12)
Composition H H H H H H H
Proper motion (right ascension) [mas/yr] 264.1389152 (0.02) 264.2316665 (0.06) 264.139 (0.02) 264.2316665
Proper motion (declination) [mas/yr] -379.9767935 (0.02) -379.9811988 (0.06) -379.977 (0.02) -379.9811988
Variability
Magnetic yes yes yes
Bd [MG] 0.009 (0.001) 0.043 * 0.043
Infrared excess (disk)
Binarity
B magnitude 13.82 13.82 13.82
V magnitude 13.62 13.60 13.61 13.61 13.59
R magnitude 13.58 13.56 13.56 13.60
I magnitude 13.50 13.47 13.47
J magnitude 13.48 (0.03) 13.52 13.52 13.48 (0.03)
H magnitude 13.45 (0.03) 13.53 13.53 13.45 (0.03)
K magnitude 13.53 (0.04) 13.58 13.58 13.53 (0.04)
u magnitude
g magnitude
r magnitude
i magnitude
z magnitude
G magnitude 13.61 (0.0008) 13.62 13.61 13.61 (0.003) 13.62
BP magnitude 13.66 (0.0008) 13.67 13.67
RP magnitude 13.51 (0.0006) 13.52 13.52
Pan g magnitude
Pan r magnitude
Pan i magnitude
Pan z magnitude
Pan y magnitude
E(B-V) 0.001

* 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.