All names: 2MASS J20300411+0729436, GALEX J203004.1+072943, NLTT 49350, USNO-B1.0 0974-00679752, Gaia EDR3 1748922296525519872, PM J20300+0729, Gaia DR2 1748922296525519872, 20300+0729, TIC 374412694, LSPM J2030+0729, Gaia DR3 1748922296525519872, WD 2027+073, J2030+0729, LP 575-16, WDJ203004.11+072943.70
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Caron et al. 2023 | Gaia DR2 | Stilism | Limoges et al. 2015 | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 20 30 04.30 (0.04) | 20 30 04.29 (0.05) | 20 30 04.30 | 20 30 04.11 (0.04) | 20 30 04.29 | 20 30 03.86 | |||||
| Declination | 07 29 40.72 (0.03) | 07 29 40.82 (0.04) | 07 29 40.72 | 07 29 43.70 (0.03) | 07 29 40.82 | 07 29 54.24 | |||||
| Spectral type | DC | DC | DQ | DC5 | DC5 | ||||||
| Effective temperature | [K] | 8631.0 (33) | 8180.0 (285) | 7730.0 (34) | |||||||
| log(g) | [cgs] | 8.08 (0.006) | 8.00 (0) | 7.85 (0.008) | |||||||
| Mass | [M☉] | 0.629 (0.006) | 0.58 (0.1) | 0.489 (0.006) | |||||||
| log(Luminosity) | [L☉] | -3.19 | |||||||||
| Cooling age | [Gyr] | 1.0800 | |||||||||
| log(H/He) | -4.0 | ||||||||||
| 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] | 24.18 (0.04) | 24.18 (0.04) | 24.17 (0.05) | 24.18 | 24.18 (0.04) | 24.17 (0.05) | ||||
| Distance | [pc] | 41.35 (0.07) | 41.36 (0.07) | 41.38 (0.09) | 42.20 (5) | 41.35 | 41.35 (0.07) | 41.38 (0.09) | |||
| Composition | He | He | |||||||||
| Proper motion (right ascension) | [mas/yr] | 178.221599 (0.05) | 178.0776855 (0.1) | 171.0 | 178.222 (0.05) | 178.0776855 | |||||
| Proper motion (declination) | [mas/yr] | -185.9353015 (0.04) | -185.9178928 (0.08) | -182.0 | -185.935 (0.04) | -185.9178928 | |||||
| Variability | |||||||||||
| Magnetic | |||||||||||
| Bd | [MG] | ||||||||||
| Infrared excess (disk) | |||||||||||
| Binarity | |||||||||||
| B magnitude | 16.30 | ||||||||||
| V magnitude | |||||||||||
| R magnitude | 15.80 | ||||||||||
| I magnitude | |||||||||||
| J magnitude | 15.66 (0.03) | 15.66 | 15.66 (0.06) | ||||||||
| H magnitude | 16.08 (0.03) | 16.08 | 16.08 (0.2) | ||||||||
| K magnitude | 15.60 (0.03) | 15.60 | 15.61 (0.2) | ||||||||
| u magnitude | |||||||||||
| g magnitude | |||||||||||
| r magnitude | |||||||||||
| i magnitude | |||||||||||
| z magnitude | |||||||||||
| G magnitude | 16.03 (0.002) | 16.05 | 16.03 | 16.03 (0.003) | 16.05 | ||||||
| BP magnitude | 16.12 (0.002) | 16.11 | 16.11 | ||||||||
| RP magnitude | 15.85 (0.002) | 15.85 | 15.85 | ||||||||
| Pan g magnitude | 16.12 (0.002) | 16.12 (0.002) | |||||||||
| Pan r magnitude | 16.11 (0.002) | 16.11 (0.002) | |||||||||
| Pan i magnitude | 16.19 (0.003) | 16.19 (0.003) | |||||||||
| Pan z magnitude | 16.31 (0.004) | 16.31 (0.004) | |||||||||
| Pan y magnitude | 16.39 (0.008) | 16.39 (0.008) | |||||||||
| E(B-V) | 0.001 | ||||||||||
* Constant surface field
Spectra without link are available upon request
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.