V644 Ser
| Simbad link | V644 Ser |
|---|---|
| Source publication | Xu, Hu-Shan (2022) - V0644 Ser: An Active Ultrashort Period Contact Binary Star |
| ADS link | 2022RAA....22c5024X |
| Name in Source publication | V644 Ser |
| Orbital period in days (P [d]) | 0.22072 |
| Mass ratio (q) | 1.95 |
| Mass ratio determination | Photometric |
| Temperature determination | Unknown |
| Type | W |
| Has total eclipse? | |
| Has spots? | |
| Has third light? | |
| Has period variation? |
| Solver | WD |
|---|---|
| Orbital period in days (P [d]) | 0.22072 |
| Mass ratio (q) | 1.95 |
| Orbital inclination in degrees (i [o]) | 77.2 |
| Fillout (f) | 0.14 |
| Primary temperature in Kelvins (T1 [K]) | 4750 |
| Secondary temperature in Kelvins (T2 [K]) | 4526 |
| Primary polar radius in units of orbital separation (r1p) | 0.3094 |
| Secondary polar radius in units of orbital separation (r2p) | 0.418 |
| Surface potential (Ω) | 5.1 |
| Orbital separation in solar radii (a [R]) | 1.45 |
|---|---|
| Primary radius in solar units (R1 [R]) | 0.48 |
| Secondary radius in solar units (R2 [R]) | 0.65 |
| Primary mass in solar units (M1 [M]) | 0.29 |
| Secondary mass in solar units (M2 [M]) | 0.56 |
| Primary temperature in kelvins (T1 [K]) | 4750 |
| Secondary temperature in Kelvins (T2 [K]) | 4526 |
| Primary luminosity in solar units (L1 [L]) | 0.11 |
| Secondary luminosity in solar units (L2 [L]) | 0.16 |
| Distance in parsecs (d [pc]) | |
| Age in gigayears (τ [gyr]) |
| Orbital period in days (P [d]) | 0.22072 |
|---|---|
| Monotonic period variation in seconds per year (dPdt [s/y]) | 0.019267 |
| Cyclic period variation in years (Pc [y]) | 9.15 |
| Designation | Gaia DR2 1189327919446976512 |
|---|---|
| RA | 234:57:47.36844 |
| DEC | 10:54:17.448192 |
| l | 18.95778518 |
| b | 47.27767147 |
| G [mag] | 19.74112 |
| G_bp [mag] | 19.881502 |
| G_rp [mag] | 17.953289 |
| Parallax | 1.512031755 |
| Distance [pc] | 0.000833069 |
| Temperature [K] | |
| Surface gravity log(g) [cm/s2] | |
| Metallicity [Fe/H] | |
| Monochromatic extinction A0 [mag] | |
| Radius [R] | |
| Luminosity [L] |
| Simbad link | V644 Ser |
|---|---|
| J magnitude | 12.773 |
| H magnitude | 12.229 |
| K magnitude | 12.036 |
| Johnson_U magnitude | 14.497 |
| Johnson_B magnitude | |
| Johnson_V magnitude | 14.66 |
| Johnson_R magnitude | 14.47 |
| Johnson_I magnitude | |
| Sloan_u magnitude | 17.633 |
| Sloan_g magnitude | 15.451 |
| Sloan_r magnitude | 14.47 |
| Sloan_i magnitude | 14.497 |
| Sloan_z magnitude | 13.914 |