EF Dra
| Simbad link | EF Dra |
|---|---|
| Source publication | Yang, Yuan-Gui (2012) - A new photometric study of the triple star system EF Draconis |
| ADS link | 2012RAA....12..419Y |
| Name in Source publication | EF Dra |
| Orbital period in days (P [d]) | 0.424028 |
| Mass ratio (q) | 0.16 |
| Mass ratio determination | Spectroscopic |
| Type | A |
| Has total eclipse? | |
| Has spots? | |
| Has third light? | |
| Has period variation? |
| Solver | WD |
|---|---|
| Orbital period in days (P [d]) | 0.424028 |
| Mass ratio (q) | 0.16 |
| Orbital inclination in degrees (i [o]) | 77.8 |
| Fillout (f) | 0.47 |
| Primary temperature in Kelvins (T1 [K]) | 6250 |
| Secondary temperature in Kelvins (T2 [K]) | 6186 |
| Primary polar radius in units of orbital separation (r1p) | 0.5156 |
| Secondary polar radius in units of orbital separation (r2p) | 0.2326 |
| Surface potential (Ω) | 2.0818 |
| Orbital separation in solar radii (a [R]) | 3.05 |
|---|---|
| Primary radius in solar units (R1 [R]) | 1.7 |
| Secondary radius in solar units (R2 [R]) | 0.78 |
| Primary mass in solar units (M1 [M]) | 1.82 |
| Secondary mass in solar units (M2 [M]) | 0.29 |
| Primary temperature in kelvins (T1 [K]) | 6250 |
| Secondary temperature in Kelvins (T2 [K]) | 6186 |
| Primary luminosity in solar units (L1 [L]) | 3.96 |
| Secondary luminosity in solar units (L2 [L]) | 0.79 |
| Distance in parsecs (d [pc]) | |
| Age in gigayears (τ [gyr]) | 4.38 |
| Orbital period in days (P [d]) | 0.424028 |
|---|---|
| Monotonic period variation in seconds per year (dPdt [s/y]) | 0.032141 |
| Cyclic period variation in years (Pc [y]) | 17.2 |
| Designation | Gaia DR2 2260078831302085120 |
|---|---|
| RA | 271:22:30.89496 |
| DEC | 69:45:14.399532 |
| l | 100.0515128 |
| b | 29.28339348 |
| G magnitude | 11.726954 |
| G_bp magnitude | |
| G_rp magnitude | |
| Radial velocity [km/s] | -38.9129734 |
| Parallax | 3.393715457 |
| Distance [pc] | 294.662299 |
| Temperature [K] | |
| Radius [R] | |
| Luminosity [L] |
| Simbad link | EF Dra |
|---|---|
| J magnitude | 9.534 |
| H magnitude | 9.251 |
| K magnitude | 9.143 |
| Johnson_U magnitude | 9.95 |
| Johnson_B magnitude | 10.92 |
| Johnson_V magnitude | 10.34 |
| Johnson_R magnitude | 10.16 |
| Johnson_I magnitude | |
| Sloan_u magnitude | |
| Sloan_g magnitude | 10.59 |
| Sloan_r magnitude | 10.16 |
| Sloan_i magnitude | 9.95 |
| Sloan_z magnitude |