GJ 836.5

All names: LFT 1655, NLTT 51906, Gaia EDR3 1792830060723673472, UBV M 42736, G126-27, SDSS J214240.92+205955.0, USNO 89, PLX 5238.01, L 1363-3, Gaia DR3 1792830060723673472, uvby98 980126027, G 126-27, TIC 354568302, J2142+2059, GJ 836.5, PM J21426+2059, LSPM J2142+2059, LTT 16348, WD 2140+20, CSI+20-21404, Gaia DR2 1792830060723673472, CNS5 5346, EGGR 148, LHS 3703, UBV 18642, 21426+2059, CSI+20-21405, WDJ214241.01+205958.12, SDSS J214240.92+205954.9, 2MASS J21424099+2059582, WISEA J214240.83+205951.2, GEN# +9.80126027, LP 458-64, WD 2140+207, G 145-63, PM 21404+2047, USNO-B1.0 1109-00564420

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Kilic et al. 2025 O'Brien et al. 2024 Caron et al. 2023 McCleery et al. 2020 Coutu et al. 2019 Gaia DR2 Stilism Holberg et al. 2016 Limoges et al. 2015 Sion et al. 2014 Giammichele et al. 2012 Holberg et al. 2008 Dufour et al. 2005 Bergeron et al. 2001 Weidemann and Koester 1995 Koester et al. 1982a Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 21 42 40.75 (0.01) 21 42 40.76 (0.03) 21 42 41.01 21 42 40.76 (0.03) 21 42 40.80 21 42 40.75 21 42 41.01 (0.01) 21 42 40.76 21 42 41.28
Declination 20 59 47.73 (0.01) 20 59 48.05 (0.03) 20 59 58.12 20 59 48.05 (0.03) 20 59 56.40 20 59 47.73 20 59 58.12 (0.01) 20 59 48.05 21 00 20.88
Spectral type DQ DQ DQ DQ DQ DQ DQ DQ6.1 DQ DQ DQ DQ DQ DQ DQ6 DQ6
Effective temperature [K] 7516.0 (10) 8495.0 (70) 8239.0 (129) 8573.9 (37) 7515.0 (262) 8256.0 (255) 8220.0 (198) 8200.0 8267.0 (255) 8200.0 (250) 8860.0 (300) 7800.0 7800.0 (300) 7869.0 (21)
log(g) [cgs] 7.86 (0.002) 8.09 (0.02) 8.00 (0.01) 8.11 (0.01) 7.86 7.61 (0.07) 7.82 (0.06) 7.83 (0.07) 7.84 (0.06) 8.07 (0.06) 7.91 (0.005)
Mass [M] 0.495 (0.002) 0.632 (0.01) 0.578 (0.01) 0.4964 0.48 (0.04) 0.47 (0.04) 0.48 (0.04) 0.49 (0.04) 0.62 (0.04) 0.29 (0.08) 0.524 (0.003)
log(Luminosity) [L] -3.09 -3.09 -3.09 (0.04)
Cooling age [Gyr] 1.0800 1.0900 0.8200 0.8200 1.0000 (0.07)
log(H/He)
log(C/He) -6.27 -5.72 -6.2908 (0.06) -5.23 -5.28 (0.4) -6.3 -5.7
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] 90.55 (0.02) 90.55 (0.02) 90.64 (0.03) 90.64 (0.03) 90.64 90.64 (0.03) 79.90 (3) 79.90 (3) 79.90 (3) 79.90 (3) 79.90 (3) 0.08 90.55 90.55 (0.02) 90.64 (0.03) 79.60 (8)
Distance [pc] 11.04 (0.002) 11.04 (0.002) 11.03 (0.004) 11.03 (0.004) 11.03 (0.004) 11.03 (0.004) 12.52 (0.5) 12.50 (0.5) 12.51 12.50 (0.5) 12.52 12.52 (0.5) 13157.89 11.04 11.04 (0.002) 11.03 (0.004) 12.56 (1)
Composition He He He He He He He He He He He
Proper motion (right ascension) [mas/yr] -224.667171 (0.02) -224.6611173 (0.05) -224.667 (0.02) -224.6611173
Proper motion (declination) [mas/yr] -649.6145288 (0.02) -649.6224567 (0.05) -649.615 (0.02) -649.6224567
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 13.37 13.37 13.40
V magnitude 13.25 13.24 13.24
R magnitude 13.10 13.10 12.90
I magnitude 12.98 12.98
J magnitude 12.98 (0.002) 12.95 12.95 12.98 (0.02)
H magnitude 12.93 (0.04) 12.93 12.93 12.93 (0.04)
K magnitude 12.92 (0.03) 12.95 12.95 12.92 (0.03)
u magnitude 13.91 (0.03) 13.91 (0.004) 13.91 (0.004)
g magnitude 15.68 (0.01) 15.68 (0.01)
r magnitude 14.86 (0.01) 14.86 (0.01)
i magnitude 15.85 (0.01) 15.85 (0.01)
z magnitude 13.66 (0.005) 13.66 (0.005)
G magnitude 13.17 (0.001) 13.19 13.19 13.17 13.17 (0.003) 13.19
BP magnitude 13.25 (0.001) 13.25 13.25
RP magnitude 13.02 (0.0006) 13.03 13.03
Pan g magnitude 13.36 (0.001) 13.36 (0.001)
Pan r magnitude 13.51 (0.1) 13.51 (0.1)
Pan i magnitude 13.37 (0.001) 13.37 (0.001)
Pan z magnitude 13.48 (0.003) 13.48 (0.003)
Pan y magnitude 13.57 (0.001) 13.57 (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.