GJ 1228

All names: USNO-B1.0 1447-00273269, LSPM J1830+5447, CNS5 4573, G227-035, G227-35, GALEX J183020.0+544729, EGGR 374, 18303+5447, Gaia EDR3 2150504594853811456, WDJ183020.27+544727.21, NLTT 46621, WD 1829+54, 2MASS J18302027+5447272, USNO 555, GJ 1228, WD 1829+547, TIC 390019679, GEN# +9.80227035, Gaia DR3 2150504594853811456, J1830+5447, G 227-35, PM J18303+5447, PLX 4267.01, Gaia DR2 2150504594853811456

Parameter Unit Gaia EDR3 Pan-STARRS DR1 O'Brien et al. 2024 Caron et al. 2023 McCleery et al. 2020 Gaia DR2 Subasavage et al. 2017 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 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 18 30 19.78 (0.02) 18 30 19.79 (0.03) 18 30 19.79 (0.03) 18 30 20.28 18 30 20.16 18 30 19.78 18 30 20.27 (0.02) 18 30 19.79 18 30 20.98
Declination 54 47 31.81 (0.02) 54 47 31.67 (0.03) 54 47 31.67 (0.03) 54 47 02.02 54 47 24.00 54 47 31.81 54 47 27.21 (0.02) 54 47 31.67 54 47 22.20
Spectral type DXP DXP DXP DXP DXP DBA DXP DQP8.0 DXP DQP DC DC DQ7P DQP7
Effective temperature [K] 6711.0 (43) 6482.0 (16) 6534.8 (23) 6330.0 (120) 6346.0 (136) 6280.0 (140) 6210.0 (101) 6345.0 6345.0 (136) 6280.0 (140) 5827.0 (43)
log(g) [cgs] 8.47 (0.01) 8.40 (0.004) 8.40 (0.009) 8.31 (0.04) 8.48 (0.1) 8.44 (0.1) 8.50 (0.1) 8.50 (0.1) 8.26 (0.007)
Mass [M] 0.897 (0.01) 0.831 (0.004) 0.78 (0.03) 0.9 (0.07) 0.9 (0.07) 0.86 (0.07) 0.9 (0.07) 0.9 (0.07) 0.736 (0.007)
log(Luminosity) [L] -3.83 (0.04) -3.94 -3.94 -3.96 (0.08)
Cooling age [Gyr] 4.0500 4.0100 (0.3) 4.6500 4.6500 4.7600 (0.2)
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] 58.70 (0.03) 58.70 (0.03) 58.70 (0.03) 58.70 (0.03) 58.70 (0.03) 58.38 (0.4) 66.80 (6) 66.80 (6) 66.80 (6) 66.80 (6) 66.80 (6) 58.70 58.70 (0.03) 58.70 (0.03) 67.30 (39)
Distance [pc] 17.04 (0.007) 17.04 (0.009) 17.04 (0.009) 17.04 (0.008) 17.04 (0.008) 17.13 (0.1) 14.97 (1) 15.00 (3) 14.97 15.00 (1) 14.97 14.97 (1) 17.04 17.04 (0.007) 17.04 (0.008) 14.86 (9)
Composition He He He H He He H H
Proper motion (right ascension) [mas/yr] -267.03649 (0.03) -267.0753446 (0.06) -267.036 (0.03) -267.0753446
Proper motion (declination) [mas/yr] 287.6903643 (0.03) 287.623021 (0.06) 287.69 (0.04) 287.623021
Variability
Magnetic yes yes yes yes yes
Bd [MG] 175 (5) 175 (90)
Infrared excess (disk)
Binarity
B magnitude 16.06 16.06 16.06 15.99
V magnitude 15.53 15.54 15.57 15.57
R magnitude 15.28 15.28 14.90
I magnitude 15.04 14.97 14.97
J magnitude 14.83 (0.005) 14.80 (0.05) 14.76 14.76 14.80 (0.05)
H magnitude 14.48 (0.05) 14.48 (0.05) 14.61 14.61 14.48 (0.05)
K magnitude 14.51 (0.08) 14.51 (0.08) 14.50 14.50 14.51 (0.08)
u magnitude
g magnitude
r magnitude
i magnitude
z magnitude
G magnitude 15.45 (0.002) 15.47 15.47 15.45 15.45 (0.003) 15.47
BP magnitude 15.67 (0.002) 15.68 15.68
RP magnitude 15.09 (0.002) 15.10 15.10
Pan g magnitude 15.72 (0.003) 15.72 (0.003)
Pan r magnitude 15.45 (0.002) 15.45 (0.002)
Pan i magnitude 15.42 (0.002) 15.42 (0.003)
Pan z magnitude 15.50 (0.003) 15.50 (0.002)
Pan y magnitude 15.63 (0.005) 15.63 (0.006)
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.