GJ 837.1

All names: EGGR 149, Gaia DR2 2666976508140663040, GEN# +9.80026031, WD 2144-079, GJ 837.1, NLTT 52097, SDSS J214737.30-074412.3, GALEX J214737.3-074412, UBV 18696, UCAC4 412-132559, WD 2144-07, CSI-07-21450, USNO 194, TIC 333464497, G 26-31, GCRV 72500, WISEA J214737.47-074413.3, G26-31, L930-80, WISE J214737.46-074413.2, Gaia DR3 2666976508140663040, LAWD 89, L 930-80, UBV M 43029, GJ 9755, PLX 5264.01, PHL 145, GL837.1, LP 698-43, UCAC2 29203111, 2MASS J21473725-0744121, Gaia EDR3 2666976508140663040, JP11 5206, LTT 8702

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Gaia DR2 Stilism Koester et al. 2014 Bergeron et al. 2011 Zuckerman et al. 2010 Voss et al. 2007 Koester et al. 2005 Wegner et al. 1987 Vincent et al. 2024 Simbad White Dwarf Catalog (McCook & Sion 1999)
Right ascension 21 47 37.56 (0.04) 21 47 37.56 (0.07) 21 47 37.56 21 47 37.29 (0.04) 21 47 36.86
Declination -07 44 14.23 (0.04) -07 44 14.17 (0.1) -07 44 14.23 -07 44 12.21 (0.04) -07 44 09.60
Spectral type DB DBZ DBZ DB DB0 DB4
Effective temperature [K] 16340.0 16340.0 (410) 16000.0 16518.0 16500.0 21000.0 15840.0 (185)
log(g) [cgs] 8.18 8.18 (0.07) 7.89 7.90 8.03 (0.01)
Mass [M] 0.7 (0.04) 0.532 0.606 (0.01)
log(Luminosity) [L] -2.09
Cooling age [Gyr] 0.2138 1.7000
log(H/He) <-6.22 (1) <-4.5
log(C/He) <-8.5
log(Ca/He) -8.6 -8.5
log(Ca/H)
log(N/He)
log(O/He)
log(Na/He)
log(Mg/He)
log(Al/He)
log(Si/He) -7.8
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] 19.03 (0.04) 19.03 19.03 (0.04) 50.00
Distance [pc] 52.56 (0.1) 49.00 52.56 52.56 (0.1) 20.00
Composition He He He
Proper motion (right ascension) [mas/yr] 256.0520623 (0.05) 256.052 (0.05)
Proper motion (declination) [mas/yr] -126.4216814 (0.04) -126.422 (0.04)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 14.77 (0.03)
V magnitude 14.82 14.82 14.83 (0.01)
R magnitude 14.96 (0.1)
I magnitude 14.89
J magnitude 15.03 (0.05)
H magnitude 15.21 (0.1)
K magnitude 14.89 (0.1)
u magnitude 14.60 (0.006)
g magnitude 14.67 (0.007)
r magnitude 14.96 (0.009)
i magnitude 15.21 (0.009)
z magnitude 15.47 (0.01)
G magnitude 14.77 (0.002) 14.79 14.77 14.77 (0.003)
BP magnitude 14.71 (0.002) 14.66
RP magnitude 14.88 (0.003) 14.89
Pan g magnitude 14.68 (0.003)
Pan r magnitude 14.95 (0.005)
Pan i magnitude 15.22 (0.002)
Pan z magnitude 15.45 (0.002)
Pan y magnitude 15.60 (0.003)
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.